Dick Hollenbeck
4bd4c43d1a
Pray for angus johnson who is support too many languages, and needs to find a text editor that removes trailing whitespace.
4555 lines
131 KiB
C++
4555 lines
131 KiB
C++
/*******************************************************************************
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* *
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* Author : Angus Johnson *
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* Version : 6.1.2 *
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* Date : 15 December 2013 *
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* Website : http://www.angusj.com *
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* Copyright : Angus Johnson 2010-2013 *
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* *
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* License: *
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* Use, modification & distribution is subject to Boost Software License Ver 1. *
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* http://www.boost.org/LICENSE_1_0.txt *
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* *
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* Attributions: *
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* The code in this library is an extension of Bala Vatti's clipping algorithm: *
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* "A generic solution to polygon clipping" *
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* Communications of the ACM, Vol 35, Issue 7 (July 1992) pp 56-63. *
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* http://portal.acm.org/citation.cfm?id=129906 *
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* *
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* Computer graphics and geometric modeling: implementation and algorithms *
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* By Max K. Agoston *
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* Springer; 1 edition (January 4, 2005) *
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* http://books.google.com/books?q=vatti+clipping+agoston *
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* *
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* See also: *
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* "Polygon Offsetting by Computing Winding Numbers" *
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* Paper no. DETC2005-85513 pp. 565-575 *
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* ASME 2005 International Design Engineering Technical Conferences *
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* and Computers and Information in Engineering Conference (IDETC/CIE2005) *
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* September 24-28, 2005 , Long Beach, California, USA *
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* http://www.me.berkeley.edu/~mcmains/pubs/DAC05OffsetPolygon.pdf *
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* *
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*******************************************************************************/
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/*******************************************************************************
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* *
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* This is a translation of the Delphi Clipper library and the naming style *
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* used has retained a Delphi flavour. *
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* *
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*******************************************************************************/
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#include "clipper.hpp"
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#include <cmath>
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#include <vector>
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#include <algorithm>
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#include <stdexcept>
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#include <cstring>
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#include <cstdlib>
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#include <ostream>
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#include <functional>
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namespace ClipperLib {
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#ifdef use_int32
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static cInt const loRange = 46340;
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static cInt const hiRange = 46340;
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#else
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static cInt const loRange = 0x3FFFFFFF;
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static cInt const hiRange = 0x3FFFFFFFFFFFFFFFLL;
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typedef unsigned long long ulong64;
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#endif
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static double const pi = 3.141592653589793238;
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static double const two_pi = pi *2;
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static double const def_arc_tolerance = 0.25;
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enum Direction { dRightToLeft, dLeftToRight };
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static int const Unassigned = -1; //edge not currently 'owning' a solution
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static int const Skip = -2; //edge that would otherwise close a path
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#define HORIZONTAL (-1.0E+40)
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#define TOLERANCE (1.0e-20)
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#define NEAR_ZERO(val) (((val) > -TOLERANCE) && ((val) < TOLERANCE))
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struct TEdge {
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IntPoint Bot;
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IntPoint Curr;
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IntPoint Top;
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IntPoint Delta;
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double Dx;
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PolyType PolyTyp;
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EdgeSide Side;
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int WindDelta; //1 or -1 depending on winding direction
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int WindCnt;
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int WindCnt2; //winding count of the opposite polytype
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int OutIdx;
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TEdge *Next;
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TEdge *Prev;
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TEdge *NextInLML;
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TEdge *NextInAEL;
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TEdge *PrevInAEL;
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TEdge *NextInSEL;
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TEdge *PrevInSEL;
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};
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struct IntersectNode {
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TEdge *Edge1;
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TEdge *Edge2;
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IntPoint Pt;
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};
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struct LocalMinima {
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cInt Y;
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TEdge *LeftBound;
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TEdge *RightBound;
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LocalMinima *Next;
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};
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struct OutPt;
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struct OutRec {
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int Idx;
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bool IsHole;
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bool IsOpen;
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OutRec *FirstLeft; //see comments in clipper.pas
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PolyNode *PolyNd;
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OutPt *Pts;
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OutPt *BottomPt;
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};
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struct OutPt {
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int Idx;
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IntPoint Pt;
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OutPt *Next;
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OutPt *Prev;
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};
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struct Join {
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OutPt *OutPt1;
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OutPt *OutPt2;
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IntPoint OffPt;
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};
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//------------------------------------------------------------------------------
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//------------------------------------------------------------------------------
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inline cInt Round(double val)
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{
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if ((val < 0)) return static_cast<cInt>(val - 0.5);
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else return static_cast<cInt>(val + 0.5);
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}
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//------------------------------------------------------------------------------
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inline cInt Abs(cInt val)
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{
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return val < 0 ? -val : val;
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}
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//------------------------------------------------------------------------------
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// PolyTree methods ...
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//------------------------------------------------------------------------------
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void PolyTree::Clear()
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{
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for (PolyNodes::size_type i = 0; i < AllNodes.size(); ++i)
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delete AllNodes[i];
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AllNodes.resize(0);
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Childs.resize(0);
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}
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//------------------------------------------------------------------------------
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PolyNode* PolyTree::GetFirst() const
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{
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if (!Childs.empty())
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return Childs[0];
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else
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return 0;
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}
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//------------------------------------------------------------------------------
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int PolyTree::Total() const
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{
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return (int)AllNodes.size();
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}
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//------------------------------------------------------------------------------
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// PolyNode methods ...
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//------------------------------------------------------------------------------
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PolyNode::PolyNode(): Childs(), Parent(0), Index(0), m_IsOpen(false)
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{
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}
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//------------------------------------------------------------------------------
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int PolyNode::ChildCount() const
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{
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return (int)Childs.size();
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}
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//------------------------------------------------------------------------------
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void PolyNode::AddChild(PolyNode& child)
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{
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unsigned cnt = (unsigned)Childs.size();
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Childs.push_back(&child);
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child.Parent = this;
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child.Index = cnt;
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}
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//------------------------------------------------------------------------------
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PolyNode* PolyNode::GetNext() const
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{
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if (!Childs.empty())
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return Childs[0];
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else
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return GetNextSiblingUp();
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}
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//------------------------------------------------------------------------------
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PolyNode* PolyNode::GetNextSiblingUp() const
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{
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if (!Parent) //protects against PolyTree.GetNextSiblingUp()
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return 0;
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else if (Index == Parent->Childs.size() - 1)
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return Parent->GetNextSiblingUp();
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else
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return Parent->Childs[Index + 1];
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}
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//------------------------------------------------------------------------------
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bool PolyNode::IsHole() const
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{
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bool result = true;
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PolyNode* node = Parent;
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while (node)
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{
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result = !result;
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node = node->Parent;
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}
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return result;
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}
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//------------------------------------------------------------------------------
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bool PolyNode::IsOpen() const
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{
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return m_IsOpen;
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}
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//------------------------------------------------------------------------------
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#ifndef use_int32
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//------------------------------------------------------------------------------
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// Int128 class (enables safe math on signed 64bit integers)
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// eg Int128 val1((cInt)9223372036854775807); //ie 2^63 -1
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// Int128 val2((cInt)9223372036854775807);
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// Int128 val3 = val1 * val2;
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// val3.AsString => "85070591730234615847396907784232501249" (8.5e+37)
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//------------------------------------------------------------------------------
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class Int128
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{
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public:
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cUInt lo;
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cInt hi;
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Int128(cInt _lo = 0)
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{
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lo = (cUInt)_lo;
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if (_lo < 0) hi = -1; else hi = 0;
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}
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Int128(const Int128 &val): lo(val.lo), hi(val.hi){}
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Int128(const cInt& _hi, const ulong64& _lo): lo(_lo), hi(_hi){}
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Int128& operator = (const cInt &val)
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{
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lo = (ulong64)val;
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if (val < 0) hi = -1; else hi = 0;
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return *this;
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}
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bool operator == (const Int128 &val) const
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{return (hi == val.hi && lo == val.lo);}
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bool operator != (const Int128 &val) const
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{ return !(*this == val);}
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bool operator > (const Int128 &val) const
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{
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if (hi != val.hi)
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return hi > val.hi;
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else
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return lo > val.lo;
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}
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bool operator < (const Int128 &val) const
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{
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if (hi != val.hi)
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return hi < val.hi;
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else
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return lo < val.lo;
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}
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bool operator >= (const Int128 &val) const
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{ return !(*this < val);}
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bool operator <= (const Int128 &val) const
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{ return !(*this > val);}
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Int128& operator += (const Int128 &rhs)
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{
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hi += rhs.hi;
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lo += rhs.lo;
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if (lo < rhs.lo) hi++;
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return *this;
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}
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Int128 operator + (const Int128 &rhs) const
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{
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Int128 result(*this);
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result+= rhs;
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return result;
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}
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Int128& operator -= (const Int128 &rhs)
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{
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*this += -rhs;
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return *this;
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}
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Int128 operator - (const Int128 &rhs) const
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{
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Int128 result(*this);
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result -= rhs;
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return result;
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}
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Int128 operator-() const //unary negation
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{
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if (lo == 0)
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return Int128(-hi,0);
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else
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return Int128(~hi,~lo +1);
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}
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Int128 operator/ (const Int128 &rhs) const
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{
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if (rhs.lo == 0 && rhs.hi == 0)
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throw "Int128 operator/: divide by zero";
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bool negate = (rhs.hi < 0) != (hi < 0);
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Int128 dividend = *this;
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Int128 divisor = rhs;
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if (dividend.hi < 0) dividend = -dividend;
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if (divisor.hi < 0) divisor = -divisor;
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if (divisor < dividend)
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{
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Int128 result = Int128(0);
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Int128 cntr = Int128(1);
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while (divisor.hi >= 0 && !(divisor > dividend))
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{
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divisor.hi <<= 1;
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if ((cInt)divisor.lo < 0) divisor.hi++;
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divisor.lo <<= 1;
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cntr.hi <<= 1;
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if ((cInt)cntr.lo < 0) cntr.hi++;
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cntr.lo <<= 1;
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}
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divisor.lo >>= 1;
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if ((divisor.hi & 1) == 1)
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divisor.lo |= 0x8000000000000000LL;
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divisor.hi = (ulong64)divisor.hi >> 1;
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cntr.lo >>= 1;
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if ((cntr.hi & 1) == 1)
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cntr.lo |= 0x8000000000000000LL;
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cntr.hi >>= 1;
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while (cntr.hi != 0 || cntr.lo != 0)
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{
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if (!(dividend < divisor))
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{
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dividend -= divisor;
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result.hi |= cntr.hi;
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result.lo |= cntr.lo;
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}
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divisor.lo >>= 1;
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if ((divisor.hi & 1) == 1)
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divisor.lo |= 0x8000000000000000LL;
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divisor.hi >>= 1;
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cntr.lo >>= 1;
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if ((cntr.hi & 1) == 1)
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cntr.lo |= 0x8000000000000000LL;
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cntr.hi >>= 1;
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}
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if (negate) result = -result;
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return result;
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}
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else if (rhs.hi == this->hi && rhs.lo == this->lo)
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return Int128(negate ? -1: 1);
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else
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return Int128(0);
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}
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double AsDouble() const
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{
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const double shift64 = 18446744073709551616.0; //2^64
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if (hi < 0)
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{
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cUInt lo_ = ~lo + 1;
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if (lo_ == 0) return (double)hi * shift64;
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else return -(double)(lo_ + ~hi * shift64);
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}
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else
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return (double)(lo + hi * shift64);
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}
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};
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//------------------------------------------------------------------------------
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Int128 Int128Mul (cInt lhs, cInt rhs)
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{
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bool negate = (lhs < 0) != (rhs < 0);
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if (lhs < 0) lhs = -lhs;
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ulong64 int1Hi = ulong64(lhs) >> 32;
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ulong64 int1Lo = ulong64(lhs & 0xFFFFFFFF);
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if (rhs < 0) rhs = -rhs;
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ulong64 int2Hi = ulong64(rhs) >> 32;
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ulong64 int2Lo = ulong64(rhs & 0xFFFFFFFF);
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//nb: see comments in clipper.pas
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ulong64 a = int1Hi * int2Hi;
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ulong64 b = int1Lo * int2Lo;
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ulong64 c = int1Hi * int2Lo + int1Lo * int2Hi;
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Int128 tmp;
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tmp.hi = cInt(a + (c >> 32));
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tmp.lo = cInt(c << 32);
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tmp.lo += cInt(b);
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if (tmp.lo < b) tmp.hi++;
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if (negate) tmp = -tmp;
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return tmp;
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};
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#endif
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//------------------------------------------------------------------------------
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// Miscellaneous global functions
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//------------------------------------------------------------------------------
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bool Orientation(const Path &poly)
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{
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return Area(poly) >= 0;
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}
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//------------------------------------------------------------------------------
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double Area(const Path &poly)
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{
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int size = (int)poly.size();
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if (size < 3) return 0;
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double a = 0;
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for (int i = 0, j = size -1; i < size; ++i)
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{
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a += ((double)poly[j].X + poly[i].X) * ((double)poly[j].Y - poly[i].Y);
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j = i;
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}
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return -a * 0.5;
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}
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//------------------------------------------------------------------------------
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double Area(const OutRec &outRec)
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{
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OutPt *op = outRec.Pts;
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if (!op) return 0;
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double a = 0;
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do {
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a += (double)(op->Prev->Pt.X + op->Pt.X) * (double)(op->Prev->Pt.Y - op->Pt.Y);
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op = op->Next;
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} while (op != outRec.Pts);
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return a * 0.5;
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}
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//------------------------------------------------------------------------------
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bool PointIsVertex(const IntPoint &Pt, OutPt *pp)
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{
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OutPt *pp2 = pp;
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do
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{
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if (pp2->Pt == Pt) return true;
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pp2 = pp2->Next;
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}
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while (pp2 != pp);
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return false;
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}
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//------------------------------------------------------------------------------
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int PointInPolygon (const IntPoint& pt, OutPt* op)
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{
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//returns 0 if false, +1 if true, -1 if pt ON polygon boundary
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//http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.88.5498&rep=rep1&type=pdf
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int result = 0;
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OutPt* startOp = op;
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for(;;)
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{
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if (op->Next->Pt.Y == pt.Y)
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{
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if ((op->Next->Pt.X == pt.X) || (op->Pt.Y == pt.Y &&
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((op->Next->Pt.X > pt.X) == (op->Pt.X < pt.X)))) return -1;
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}
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if ((op->Pt.Y < pt.Y) != (op->Next->Pt.Y < pt.Y))
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{
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if (op->Pt.X >= pt.X)
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{
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if (op->Next->Pt.X > pt.X) result = 1 - result;
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else
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{
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double d = (double)(op->Pt.X - pt.X) * (op->Next->Pt.Y - pt.Y) -
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(double)(op->Next->Pt.X - pt.X) * (op->Pt.Y - pt.Y);
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if (!d) return -1;
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if ((d > 0) == (op->Next->Pt.Y > op->Pt.Y)) result = 1 - result;
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}
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} else
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{
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if (op->Next->Pt.X > pt.X)
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{
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double d = (double)(op->Pt.X - pt.X) * (op->Next->Pt.Y - pt.Y) -
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(double)(op->Next->Pt.X - pt.X) * (op->Pt.Y - pt.Y);
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if (!d) return -1;
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if ((d > 0) == (op->Next->Pt.Y > op->Pt.Y)) result = 1 - result;
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}
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}
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}
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op = op->Next;
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if (startOp == op) break;
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}
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return result;
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}
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//------------------------------------------------------------------------------
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bool Poly2ContainsPoly1(OutPt* OutPt1, OutPt* OutPt2)
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{
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OutPt* op = OutPt1;
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do
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{
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int res = PointInPolygon(op->Pt, OutPt2);
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if (res >= 0) return res != 0;
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op = op->Next;
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}
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while (op != OutPt1);
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return true;
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}
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//----------------------------------------------------------------------
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bool SlopesEqual(const TEdge &e1, const TEdge &e2, bool UseFullInt64Range)
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|
{
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|
#ifndef use_int32
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|
if (UseFullInt64Range)
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|
return Int128Mul(e1.Delta.Y, e2.Delta.X) == Int128Mul(e1.Delta.X, e2.Delta.Y);
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else
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#endif
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return e1.Delta.Y * e2.Delta.X == e1.Delta.X * e2.Delta.Y;
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}
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//------------------------------------------------------------------------------
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bool SlopesEqual(const IntPoint pt1, const IntPoint pt2,
|
|
const IntPoint pt3, bool UseFullInt64Range)
|
|
{
|
|
#ifndef use_int32
|
|
if (UseFullInt64Range)
|
|
return Int128Mul(pt1.Y-pt2.Y, pt2.X-pt3.X) == Int128Mul(pt1.X-pt2.X, pt2.Y-pt3.Y);
|
|
else
|
|
#endif
|
|
return (pt1.Y-pt2.Y)*(pt2.X-pt3.X) == (pt1.X-pt2.X)*(pt2.Y-pt3.Y);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool SlopesEqual(const IntPoint pt1, const IntPoint pt2,
|
|
const IntPoint pt3, const IntPoint pt4, bool UseFullInt64Range)
|
|
{
|
|
#ifndef use_int32
|
|
if (UseFullInt64Range)
|
|
return Int128Mul(pt1.Y-pt2.Y, pt3.X-pt4.X) == Int128Mul(pt1.X-pt2.X, pt3.Y-pt4.Y);
|
|
else
|
|
#endif
|
|
return (pt1.Y-pt2.Y)*(pt3.X-pt4.X) == (pt1.X-pt2.X)*(pt3.Y-pt4.Y);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
inline bool IsHorizontal(TEdge &e)
|
|
{
|
|
return e.Delta.Y == 0;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
inline double GetDx(const IntPoint pt1, const IntPoint pt2)
|
|
{
|
|
return (pt1.Y == pt2.Y) ?
|
|
HORIZONTAL : (double)(pt2.X - pt1.X) / (pt2.Y - pt1.Y);
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
inline void SetDx(TEdge &e)
|
|
{
|
|
e.Delta.X = (e.Top.X - e.Bot.X);
|
|
e.Delta.Y = (e.Top.Y - e.Bot.Y);
|
|
|
|
if (e.Delta.Y == 0) e.Dx = HORIZONTAL;
|
|
else e.Dx = (double)(e.Delta.X) / e.Delta.Y;
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
inline void SwapSides(TEdge &Edge1, TEdge &Edge2)
|
|
{
|
|
EdgeSide Side = Edge1.Side;
|
|
Edge1.Side = Edge2.Side;
|
|
Edge2.Side = Side;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
inline void SwapPolyIndexes(TEdge &Edge1, TEdge &Edge2)
|
|
{
|
|
int OutIdx = Edge1.OutIdx;
|
|
Edge1.OutIdx = Edge2.OutIdx;
|
|
Edge2.OutIdx = OutIdx;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
inline cInt TopX(TEdge &edge, const cInt currentY)
|
|
{
|
|
return ( currentY == edge.Top.Y ) ?
|
|
edge.Top.X : edge.Bot.X + Round(edge.Dx *(currentY - edge.Bot.Y));
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool IntersectPoint(TEdge &Edge1, TEdge &Edge2,
|
|
IntPoint &ip, bool UseFullInt64Range)
|
|
{
|
|
#ifdef use_xyz
|
|
ip.Z = 0;
|
|
#endif
|
|
double b1, b2;
|
|
//nb: with very large coordinate values, it's possible for SlopesEqual() to
|
|
//return false but for the edge.Dx value be equal due to double precision rounding.
|
|
if (SlopesEqual(Edge1, Edge2, UseFullInt64Range) || Edge1.Dx == Edge2.Dx)
|
|
{
|
|
if (Edge2.Bot.Y > Edge1.Bot.Y) ip = Edge2.Bot;
|
|
else ip = Edge1.Bot;
|
|
return false;
|
|
}
|
|
else if (Edge1.Delta.X == 0)
|
|
{
|
|
ip.X = Edge1.Bot.X;
|
|
if (IsHorizontal(Edge2))
|
|
ip.Y = Edge2.Bot.Y;
|
|
else
|
|
{
|
|
b2 = Edge2.Bot.Y - (Edge2.Bot.X / Edge2.Dx);
|
|
ip.Y = Round(ip.X / Edge2.Dx + b2);
|
|
}
|
|
}
|
|
else if (Edge2.Delta.X == 0)
|
|
{
|
|
ip.X = Edge2.Bot.X;
|
|
if (IsHorizontal(Edge1))
|
|
ip.Y = Edge1.Bot.Y;
|
|
else
|
|
{
|
|
b1 = Edge1.Bot.Y - (Edge1.Bot.X / Edge1.Dx);
|
|
ip.Y = Round(ip.X / Edge1.Dx + b1);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
b1 = Edge1.Bot.X - Edge1.Bot.Y * Edge1.Dx;
|
|
b2 = Edge2.Bot.X - Edge2.Bot.Y * Edge2.Dx;
|
|
double q = (b2-b1) / (Edge1.Dx - Edge2.Dx);
|
|
ip.Y = Round(q);
|
|
if (std::fabs(Edge1.Dx) < std::fabs(Edge2.Dx))
|
|
ip.X = Round(Edge1.Dx * q + b1);
|
|
else
|
|
ip.X = Round(Edge2.Dx * q + b2);
|
|
}
|
|
|
|
if (ip.Y < Edge1.Top.Y || ip.Y < Edge2.Top.Y)
|
|
{
|
|
if (Edge1.Top.Y > Edge2.Top.Y)
|
|
ip.Y = Edge1.Top.Y;
|
|
else
|
|
ip.Y = Edge2.Top.Y;
|
|
if (std::fabs(Edge1.Dx) < std::fabs(Edge2.Dx))
|
|
ip.X = TopX(Edge1, ip.Y);
|
|
else
|
|
ip.X = TopX(Edge2, ip.Y);
|
|
}
|
|
return true;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void ReversePolyPtLinks(OutPt *pp)
|
|
{
|
|
if (!pp) return;
|
|
OutPt *pp1, *pp2;
|
|
pp1 = pp;
|
|
do {
|
|
pp2 = pp1->Next;
|
|
pp1->Next = pp1->Prev;
|
|
pp1->Prev = pp2;
|
|
pp1 = pp2;
|
|
} while( pp1 != pp );
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void DisposeOutPts(OutPt*& pp)
|
|
{
|
|
if (pp == 0) return;
|
|
pp->Prev->Next = 0;
|
|
while( pp )
|
|
{
|
|
OutPt *tmpPp = pp;
|
|
pp = pp->Next;
|
|
delete tmpPp;
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
inline void InitEdge(TEdge* e, TEdge* eNext, TEdge* ePrev, const IntPoint& Pt)
|
|
{
|
|
std::memset(e, 0, sizeof(TEdge));
|
|
e->Next = eNext;
|
|
e->Prev = ePrev;
|
|
e->Curr = Pt;
|
|
e->OutIdx = Unassigned;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void InitEdge2(TEdge& e, PolyType Pt)
|
|
{
|
|
if (e.Curr.Y >= e.Next->Curr.Y)
|
|
{
|
|
e.Bot = e.Curr;
|
|
e.Top = e.Next->Curr;
|
|
} else
|
|
{
|
|
e.Top = e.Curr;
|
|
e.Bot = e.Next->Curr;
|
|
}
|
|
SetDx(e);
|
|
e.PolyTyp = Pt;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
TEdge* RemoveEdge(TEdge* e)
|
|
{
|
|
//removes e from double_linked_list (but without removing from memory)
|
|
e->Prev->Next = e->Next;
|
|
e->Next->Prev = e->Prev;
|
|
TEdge* result = e->Next;
|
|
e->Prev = 0; //flag as removed (see ClipperBase.Clear)
|
|
return result;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
inline void ReverseHorizontal(TEdge &e)
|
|
{
|
|
//swap horizontal edges' Top and Bottom x's so they follow the natural
|
|
//progression of the bounds - ie so their xbots will align with the
|
|
//adjoining lower edge. [Helpful in the ProcessHorizontal() method.]
|
|
cInt tmp = e.Top.X;
|
|
e.Top.X = e.Bot.X;
|
|
e.Bot.X = tmp;
|
|
#ifdef use_xyz
|
|
tmp = e.Top.Z;
|
|
e.Top.Z = e.Bot.Z;
|
|
e.Bot.Z = tmp;
|
|
#endif
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void SwapPoints(IntPoint &pt1, IntPoint &pt2)
|
|
{
|
|
IntPoint tmp = pt1;
|
|
pt1 = pt2;
|
|
pt2 = tmp;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool GetOverlapSegment(IntPoint pt1a, IntPoint pt1b, IntPoint pt2a,
|
|
IntPoint pt2b, IntPoint &pt1, IntPoint &pt2)
|
|
{
|
|
//precondition: segments are Collinear.
|
|
if (Abs(pt1a.X - pt1b.X) > Abs(pt1a.Y - pt1b.Y))
|
|
{
|
|
if (pt1a.X > pt1b.X) SwapPoints(pt1a, pt1b);
|
|
if (pt2a.X > pt2b.X) SwapPoints(pt2a, pt2b);
|
|
if (pt1a.X > pt2a.X) pt1 = pt1a; else pt1 = pt2a;
|
|
if (pt1b.X < pt2b.X) pt2 = pt1b; else pt2 = pt2b;
|
|
return pt1.X < pt2.X;
|
|
} else
|
|
{
|
|
if (pt1a.Y < pt1b.Y) SwapPoints(pt1a, pt1b);
|
|
if (pt2a.Y < pt2b.Y) SwapPoints(pt2a, pt2b);
|
|
if (pt1a.Y < pt2a.Y) pt1 = pt1a; else pt1 = pt2a;
|
|
if (pt1b.Y > pt2b.Y) pt2 = pt1b; else pt2 = pt2b;
|
|
return pt1.Y > pt2.Y;
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool FirstIsBottomPt(const OutPt* btmPt1, const OutPt* btmPt2)
|
|
{
|
|
OutPt *p = btmPt1->Prev;
|
|
while ((p->Pt == btmPt1->Pt) && (p != btmPt1)) p = p->Prev;
|
|
double dx1p = std::fabs(GetDx(btmPt1->Pt, p->Pt));
|
|
p = btmPt1->Next;
|
|
while ((p->Pt == btmPt1->Pt) && (p != btmPt1)) p = p->Next;
|
|
double dx1n = std::fabs(GetDx(btmPt1->Pt, p->Pt));
|
|
|
|
p = btmPt2->Prev;
|
|
while ((p->Pt == btmPt2->Pt) && (p != btmPt2)) p = p->Prev;
|
|
double dx2p = std::fabs(GetDx(btmPt2->Pt, p->Pt));
|
|
p = btmPt2->Next;
|
|
while ((p->Pt == btmPt2->Pt) && (p != btmPt2)) p = p->Next;
|
|
double dx2n = std::fabs(GetDx(btmPt2->Pt, p->Pt));
|
|
return (dx1p >= dx2p && dx1p >= dx2n) || (dx1n >= dx2p && dx1n >= dx2n);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
OutPt* GetBottomPt(OutPt *pp)
|
|
{
|
|
OutPt* dups = 0;
|
|
OutPt* p = pp->Next;
|
|
while (p != pp)
|
|
{
|
|
if (p->Pt.Y > pp->Pt.Y)
|
|
{
|
|
pp = p;
|
|
dups = 0;
|
|
}
|
|
else if (p->Pt.Y == pp->Pt.Y && p->Pt.X <= pp->Pt.X)
|
|
{
|
|
if (p->Pt.X < pp->Pt.X)
|
|
{
|
|
dups = 0;
|
|
pp = p;
|
|
} else
|
|
{
|
|
if (p->Next != pp && p->Prev != pp) dups = p;
|
|
}
|
|
}
|
|
p = p->Next;
|
|
}
|
|
if (dups)
|
|
{
|
|
//there appears to be at least 2 vertices at BottomPt so ...
|
|
while (dups != p)
|
|
{
|
|
if (!FirstIsBottomPt(p, dups)) pp = dups;
|
|
dups = dups->Next;
|
|
while (dups->Pt != pp->Pt) dups = dups->Next;
|
|
}
|
|
}
|
|
return pp;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool FindSegment(OutPt* &pp, bool UseFullInt64Range,
|
|
IntPoint &pt1, IntPoint &pt2)
|
|
{
|
|
//OutPt1 & OutPt2 => the overlap segment (if the function returns true)
|
|
if (!pp) return false;
|
|
OutPt* pp2 = pp;
|
|
IntPoint pt1a = pt1, pt2a = pt2;
|
|
do
|
|
{
|
|
if (SlopesEqual(pt1a, pt2a, pp->Pt, pp->Prev->Pt, UseFullInt64Range) &&
|
|
SlopesEqual(pt1a, pt2a, pp->Pt, UseFullInt64Range) &&
|
|
GetOverlapSegment(pt1a, pt2a, pp->Pt, pp->Prev->Pt, pt1, pt2))
|
|
return true;
|
|
pp = pp->Next;
|
|
}
|
|
while (pp != pp2);
|
|
return false;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool Pt2IsBetweenPt1AndPt3(const IntPoint pt1,
|
|
const IntPoint pt2, const IntPoint pt3)
|
|
{
|
|
if ((pt1 == pt3) || (pt1 == pt2) || (pt3 == pt2))
|
|
return false;
|
|
else if (pt1.X != pt3.X)
|
|
return (pt2.X > pt1.X) == (pt2.X < pt3.X);
|
|
else
|
|
return (pt2.Y > pt1.Y) == (pt2.Y < pt3.Y);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
OutPt* InsertPolyPtBetween(OutPt* p1, OutPt* p2, const IntPoint Pt)
|
|
{
|
|
if (p1 == p2) throw "JoinError";
|
|
OutPt* result = new OutPt;
|
|
result->Pt = Pt;
|
|
if (p2 == p1->Next)
|
|
{
|
|
p1->Next = result;
|
|
p2->Prev = result;
|
|
result->Next = p2;
|
|
result->Prev = p1;
|
|
} else
|
|
{
|
|
p2->Next = result;
|
|
p1->Prev = result;
|
|
result->Next = p1;
|
|
result->Prev = p2;
|
|
}
|
|
return result;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool HorzSegmentsOverlap(const IntPoint& pt1a, const IntPoint& pt1b,
|
|
const IntPoint& pt2a, const IntPoint& pt2b)
|
|
{
|
|
//precondition: both segments are horizontal
|
|
if ((pt1a.X > pt2a.X) == (pt1a.X < pt2b.X)) return true;
|
|
else if ((pt1b.X > pt2a.X) == (pt1b.X < pt2b.X)) return true;
|
|
else if ((pt2a.X > pt1a.X) == (pt2a.X < pt1b.X)) return true;
|
|
else if ((pt2b.X > pt1a.X) == (pt2b.X < pt1b.X)) return true;
|
|
else if ((pt1a.X == pt2a.X) && (pt1b.X == pt2b.X)) return true;
|
|
else if ((pt1a.X == pt2b.X) && (pt1b.X == pt2a.X)) return true;
|
|
else return false;
|
|
}
|
|
|
|
|
|
//------------------------------------------------------------------------------
|
|
// ClipperBase class methods ...
|
|
//------------------------------------------------------------------------------
|
|
|
|
ClipperBase::ClipperBase() //constructor
|
|
{
|
|
m_MinimaList = 0;
|
|
m_CurrentLM = 0;
|
|
m_UseFullRange = false;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
ClipperBase::~ClipperBase() //destructor
|
|
{
|
|
Clear();
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void RangeTest(const IntPoint& Pt, bool& useFullRange)
|
|
{
|
|
if (useFullRange)
|
|
{
|
|
if (Pt.X > hiRange || Pt.Y > hiRange || -Pt.X > hiRange || -Pt.Y > hiRange)
|
|
throw "Coordinate outside allowed range";
|
|
}
|
|
else if (Pt.X > loRange|| Pt.Y > loRange || -Pt.X > loRange || -Pt.Y > loRange)
|
|
{
|
|
useFullRange = true;
|
|
RangeTest(Pt, useFullRange);
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
TEdge* FindNextLocMin(TEdge* E)
|
|
{
|
|
for (;;)
|
|
{
|
|
while (E->Bot != E->Prev->Bot || E->Curr == E->Top) E = E->Next;
|
|
if (!IsHorizontal(*E) && !IsHorizontal(*E->Prev)) break;
|
|
while (IsHorizontal(*E->Prev)) E = E->Prev;
|
|
TEdge* E2 = E;
|
|
while (IsHorizontal(*E)) E = E->Next;
|
|
if (E->Top.Y == E->Prev->Bot.Y) continue; //ie just an intermediate horz.
|
|
if (E2->Prev->Bot.X < E->Bot.X) E = E2;
|
|
break;
|
|
}
|
|
return E;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
TEdge* ClipperBase::ProcessBound(TEdge* E, bool IsClockwise)
|
|
{
|
|
TEdge *EStart = E, *Result = E;
|
|
TEdge *Horz = 0;
|
|
cInt StartX;
|
|
if (IsHorizontal(*E))
|
|
{
|
|
//it's possible for adjacent overlapping horz edges to start heading left
|
|
//before finishing right, so ...
|
|
if (IsClockwise) StartX = E->Prev->Bot.X;
|
|
else StartX = E->Next->Bot.X;
|
|
if (E->Bot.X != StartX) ReverseHorizontal(*E);
|
|
}
|
|
|
|
if (Result->OutIdx != Skip)
|
|
{
|
|
if (IsClockwise)
|
|
{
|
|
while (Result->Top.Y == Result->Next->Bot.Y && Result->Next->OutIdx != Skip)
|
|
Result = Result->Next;
|
|
if (IsHorizontal(*Result) && Result->Next->OutIdx != Skip)
|
|
{
|
|
//nb: at the top of a bound, horizontals are added to the bound
|
|
//only when the preceding edge attaches to the horizontal's left vertex
|
|
//unless a Skip edge is encountered when that becomes the top divide
|
|
Horz = Result;
|
|
while (IsHorizontal(*Horz->Prev)) Horz = Horz->Prev;
|
|
if (Horz->Prev->Top.X == Result->Next->Top.X)
|
|
{
|
|
if (!IsClockwise) Result = Horz->Prev;
|
|
}
|
|
else if (Horz->Prev->Top.X > Result->Next->Top.X) Result = Horz->Prev;
|
|
}
|
|
while (E != Result)
|
|
{
|
|
E->NextInLML = E->Next;
|
|
if (IsHorizontal(*E) && E != EStart &&
|
|
E->Bot.X != E->Prev->Top.X) ReverseHorizontal(*E);
|
|
E = E->Next;
|
|
}
|
|
if (IsHorizontal(*E) && E != EStart && E->Bot.X != E->Prev->Top.X)
|
|
ReverseHorizontal(*E);
|
|
Result = Result->Next; //move to the edge just beyond current bound
|
|
} else
|
|
{
|
|
while (Result->Top.Y == Result->Prev->Bot.Y && Result->Prev->OutIdx != Skip)
|
|
Result = Result->Prev;
|
|
if (IsHorizontal(*Result) && Result->Prev->OutIdx != Skip)
|
|
{
|
|
Horz = Result;
|
|
while (IsHorizontal(*Horz->Next)) Horz = Horz->Next;
|
|
if (Horz->Next->Top.X == Result->Prev->Top.X)
|
|
{
|
|
if (!IsClockwise) Result = Horz->Next;
|
|
}
|
|
else if (Horz->Next->Top.X > Result->Prev->Top.X) Result = Horz->Next;
|
|
}
|
|
|
|
while (E != Result)
|
|
{
|
|
E->NextInLML = E->Prev;
|
|
if (IsHorizontal(*E) && E != EStart && E->Bot.X != E->Next->Top.X)
|
|
ReverseHorizontal(*E);
|
|
E = E->Prev;
|
|
}
|
|
if (IsHorizontal(*E) && E != EStart && E->Bot.X != E->Next->Top.X)
|
|
ReverseHorizontal(*E);
|
|
Result = Result->Prev; //move to the edge just beyond current bound
|
|
}
|
|
}
|
|
|
|
if (Result->OutIdx == Skip)
|
|
{
|
|
//if edges still remain in the current bound beyond the skip edge then
|
|
//create another LocMin and call ProcessBound once more
|
|
E = Result;
|
|
if (IsClockwise)
|
|
{
|
|
while (E->Top.Y == E->Next->Bot.Y) E = E->Next;
|
|
//don't include top horizontals when parsing a bound a second time,
|
|
//they will be contained in the opposite bound ...
|
|
while (E != Result && IsHorizontal(*E)) E = E->Prev;
|
|
} else
|
|
{
|
|
while (E->Top.Y == E->Prev->Bot.Y) E = E->Prev;
|
|
while (E != Result && IsHorizontal(*E)) E = E->Next;
|
|
}
|
|
if (E == Result)
|
|
{
|
|
if (IsClockwise) Result = E->Next;
|
|
else Result = E->Prev;
|
|
} else
|
|
{
|
|
//there are more edges in the bound beyond result starting with E
|
|
if (IsClockwise)
|
|
E = Result->Next;
|
|
else
|
|
E = Result->Prev;
|
|
LocalMinima* locMin = new LocalMinima;
|
|
locMin->Next = 0;
|
|
locMin->Y = E->Bot.Y;
|
|
locMin->LeftBound = 0;
|
|
locMin->RightBound = E;
|
|
locMin->RightBound->WindDelta = 0;
|
|
Result = ProcessBound(locMin->RightBound, IsClockwise);
|
|
InsertLocalMinima(locMin);
|
|
}
|
|
}
|
|
return Result;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool ClipperBase::AddPath(const Path &pg, PolyType PolyTyp, bool Closed)
|
|
{
|
|
#ifdef use_lines
|
|
if (!Closed && PolyTyp == ptClip)
|
|
throw clipperException("AddPath: Open paths must be subject.");
|
|
#else
|
|
if (!Closed)
|
|
throw clipperException("AddPath: Open paths have been disabled.");
|
|
#endif
|
|
|
|
int highI = (int)pg.size() -1;
|
|
if (Closed) while (highI > 0 && (pg[highI] == pg[0])) --highI;
|
|
while (highI > 0 && (pg[highI] == pg[highI -1])) --highI;
|
|
if ((Closed && highI < 2) || (!Closed && highI < 1)) return false;
|
|
|
|
//create a new edge array ...
|
|
TEdge *edges = new TEdge [highI +1];
|
|
|
|
bool IsFlat = true;
|
|
//1. Basic (first) edge initialization ...
|
|
try
|
|
{
|
|
edges[1].Curr = pg[1];
|
|
RangeTest(pg[0], m_UseFullRange);
|
|
RangeTest(pg[highI], m_UseFullRange);
|
|
InitEdge(&edges[0], &edges[1], &edges[highI], pg[0]);
|
|
InitEdge(&edges[highI], &edges[0], &edges[highI-1], pg[highI]);
|
|
for (int i = highI - 1; i >= 1; --i)
|
|
{
|
|
RangeTest(pg[i], m_UseFullRange);
|
|
InitEdge(&edges[i], &edges[i+1], &edges[i-1], pg[i]);
|
|
}
|
|
}
|
|
catch(...)
|
|
{
|
|
delete [] edges;
|
|
return false; //almost certainly a vertex has exceeded range
|
|
}
|
|
|
|
TEdge *eStart = &edges[0];
|
|
if (!Closed) eStart->Prev->OutIdx = Skip;
|
|
|
|
//2. Remove duplicate vertices, and (when closed) collinear edges ...
|
|
TEdge *E = eStart, *eLoopStop = eStart;
|
|
for (;;)
|
|
{
|
|
if ((E->Curr == E->Next->Curr))
|
|
{
|
|
if (E == E->Next) break;
|
|
if (E == eStart) eStart = E->Next;
|
|
E = RemoveEdge(E);
|
|
eLoopStop = E;
|
|
continue;
|
|
}
|
|
if (E->Prev == E->Next)
|
|
break; //only two vertices
|
|
else if (Closed &&
|
|
SlopesEqual(E->Prev->Curr, E->Curr, E->Next->Curr, m_UseFullRange) &&
|
|
(!m_PreserveCollinear ||
|
|
!Pt2IsBetweenPt1AndPt3(E->Prev->Curr, E->Curr, E->Next->Curr)))
|
|
{
|
|
//Collinear edges are allowed for open paths but in closed paths
|
|
//the default is to merge adjacent collinear edges into a single edge.
|
|
//However, if the PreserveCollinear property is enabled, only overlapping
|
|
//collinear edges (ie spikes) will be removed from closed paths.
|
|
if (E == eStart) eStart = E->Next;
|
|
E = RemoveEdge(E);
|
|
E = E->Prev;
|
|
eLoopStop = E;
|
|
continue;
|
|
}
|
|
E = E->Next;
|
|
if (E == eLoopStop) break;
|
|
}
|
|
|
|
if ((!Closed && (E == E->Next)) || (Closed && (E->Prev == E->Next)))
|
|
{
|
|
delete [] edges;
|
|
return false;
|
|
}
|
|
|
|
if (!Closed) m_HasOpenPaths = true;
|
|
|
|
//3. Do second stage of edge initialization ...
|
|
E = eStart;
|
|
do
|
|
{
|
|
InitEdge2(*E, PolyTyp);
|
|
E = E->Next;
|
|
if (IsFlat && E->Curr.Y != eStart->Curr.Y) IsFlat = false;
|
|
}
|
|
while (E != eStart);
|
|
|
|
//4. Finally, add edge bounds to LocalMinima list ...
|
|
|
|
//Totally flat paths must be handled differently when adding them
|
|
//to LocalMinima list to avoid endless loops etc ...
|
|
if (IsFlat)
|
|
{
|
|
if (Closed)
|
|
{
|
|
delete [] edges;
|
|
return false;
|
|
}
|
|
E->Prev->OutIdx = Skip;
|
|
if (E->Prev->Bot.X < E->Prev->Top.X) ReverseHorizontal(*E->Prev);
|
|
LocalMinima* locMin = new LocalMinima();
|
|
locMin->Next = 0;
|
|
locMin->Y = E->Bot.Y;
|
|
locMin->LeftBound = 0;
|
|
locMin->RightBound = E;
|
|
locMin->RightBound->Side = esRight;
|
|
locMin->RightBound->WindDelta = 0;
|
|
while (E->Next->OutIdx != Skip)
|
|
{
|
|
E->NextInLML = E->Next;
|
|
if (E->Bot.X != E->Prev->Top.X) ReverseHorizontal(*E);
|
|
E = E->Next;
|
|
}
|
|
InsertLocalMinima(locMin);
|
|
m_edges.push_back(edges);
|
|
return true;
|
|
}
|
|
|
|
m_edges.push_back(edges);
|
|
bool clockwise;
|
|
TEdge* EMin = 0;
|
|
for (;;)
|
|
{
|
|
E = FindNextLocMin(E);
|
|
if (E == EMin) break;
|
|
else if (!EMin) EMin = E;
|
|
|
|
//E and E.Prev now share a local minima (left aligned if horizontal).
|
|
//Compare their slopes to find which starts which bound ...
|
|
LocalMinima* locMin = new LocalMinima;
|
|
locMin->Next = 0;
|
|
locMin->Y = E->Bot.Y;
|
|
if (E->Dx < E->Prev->Dx)
|
|
{
|
|
locMin->LeftBound = E->Prev;
|
|
locMin->RightBound = E;
|
|
clockwise = false; //Q.nextInLML = Q.prev
|
|
} else
|
|
{
|
|
locMin->LeftBound = E;
|
|
locMin->RightBound = E->Prev;
|
|
clockwise = true; //Q.nextInLML = Q.next
|
|
}
|
|
locMin->LeftBound->Side = esLeft;
|
|
locMin->RightBound->Side = esRight;
|
|
|
|
if (!Closed) locMin->LeftBound->WindDelta = 0;
|
|
else if (locMin->LeftBound->Next == locMin->RightBound)
|
|
locMin->LeftBound->WindDelta = -1;
|
|
else locMin->LeftBound->WindDelta = 1;
|
|
locMin->RightBound->WindDelta = -locMin->LeftBound->WindDelta;
|
|
|
|
E = ProcessBound(locMin->LeftBound, clockwise);
|
|
TEdge* E2 = ProcessBound(locMin->RightBound, !clockwise);
|
|
|
|
if (locMin->LeftBound->OutIdx == Skip)
|
|
locMin->LeftBound = 0;
|
|
else if (locMin->RightBound->OutIdx == Skip)
|
|
locMin->RightBound = 0;
|
|
InsertLocalMinima(locMin);
|
|
if (!clockwise) E = E2;
|
|
}
|
|
return true;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool ClipperBase::AddPaths(const Paths &ppg, PolyType PolyTyp, bool Closed)
|
|
{
|
|
bool result = false;
|
|
for (Paths::size_type i = 0; i < ppg.size(); ++i)
|
|
if (AddPath(ppg[i], PolyTyp, Closed)) result = true;
|
|
return result;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void ClipperBase::InsertLocalMinima(LocalMinima *newLm)
|
|
{
|
|
if( ! m_MinimaList )
|
|
{
|
|
m_MinimaList = newLm;
|
|
}
|
|
else if( newLm->Y >= m_MinimaList->Y )
|
|
{
|
|
newLm->Next = m_MinimaList;
|
|
m_MinimaList = newLm;
|
|
} else
|
|
{
|
|
LocalMinima* tmpLm = m_MinimaList;
|
|
while( tmpLm->Next && ( newLm->Y < tmpLm->Next->Y ) )
|
|
tmpLm = tmpLm->Next;
|
|
newLm->Next = tmpLm->Next;
|
|
tmpLm->Next = newLm;
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void ClipperBase::Clear()
|
|
{
|
|
DisposeLocalMinimaList();
|
|
for (EdgeList::size_type i = 0; i < m_edges.size(); ++i)
|
|
{
|
|
//for each edge array in turn, find the first used edge and
|
|
//check for and remove any hiddenPts in each edge in the array.
|
|
TEdge* edges = m_edges[i];
|
|
delete [] edges;
|
|
}
|
|
m_edges.clear();
|
|
m_UseFullRange = false;
|
|
m_HasOpenPaths = false;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void ClipperBase::Reset()
|
|
{
|
|
m_CurrentLM = m_MinimaList;
|
|
if( !m_CurrentLM ) return; //ie nothing to process
|
|
|
|
//reset all edges ...
|
|
LocalMinima* lm = m_MinimaList;
|
|
while( lm )
|
|
{
|
|
TEdge* e = lm->LeftBound;
|
|
if (e)
|
|
{
|
|
e->Curr = e->Bot;
|
|
e->Side = esLeft;
|
|
e->OutIdx = Unassigned;
|
|
}
|
|
|
|
e = lm->RightBound;
|
|
if (e)
|
|
{
|
|
e->Curr = e->Bot;
|
|
e->Side = esRight;
|
|
e->OutIdx = Unassigned;
|
|
}
|
|
lm = lm->Next;
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void ClipperBase::DisposeLocalMinimaList()
|
|
{
|
|
while( m_MinimaList )
|
|
{
|
|
LocalMinima* tmpLm = m_MinimaList->Next;
|
|
delete m_MinimaList;
|
|
m_MinimaList = tmpLm;
|
|
}
|
|
m_CurrentLM = 0;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void ClipperBase::PopLocalMinima()
|
|
{
|
|
if( ! m_CurrentLM ) return;
|
|
m_CurrentLM = m_CurrentLM->Next;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
IntRect ClipperBase::GetBounds()
|
|
{
|
|
IntRect result;
|
|
LocalMinima* lm = m_MinimaList;
|
|
if (!lm)
|
|
{
|
|
result.left = result.top = result.right = result.bottom = 0;
|
|
return result;
|
|
}
|
|
result.left = lm->LeftBound->Bot.X;
|
|
result.top = lm->LeftBound->Bot.Y;
|
|
result.right = lm->LeftBound->Bot.X;
|
|
result.bottom = lm->LeftBound->Bot.Y;
|
|
while (lm)
|
|
{
|
|
if (lm->LeftBound->Bot.Y > result.bottom)
|
|
result.bottom = lm->LeftBound->Bot.Y;
|
|
TEdge* e = lm->LeftBound;
|
|
for (;;) {
|
|
TEdge* bottomE = e;
|
|
while (e->NextInLML)
|
|
{
|
|
if (e->Bot.X < result.left) result.left = e->Bot.X;
|
|
if (e->Bot.X > result.right) result.right = e->Bot.X;
|
|
e = e->NextInLML;
|
|
}
|
|
if (e->Bot.X < result.left) result.left = e->Bot.X;
|
|
if (e->Bot.X > result.right) result.right = e->Bot.X;
|
|
if (e->Top.X < result.left) result.left = e->Top.X;
|
|
if (e->Top.X > result.right) result.right = e->Top.X;
|
|
if (e->Top.Y < result.top) result.top = e->Top.Y;
|
|
|
|
if (bottomE == lm->LeftBound) e = lm->RightBound;
|
|
else break;
|
|
}
|
|
lm = lm->Next;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// TClipper methods ...
|
|
//------------------------------------------------------------------------------
|
|
|
|
Clipper::Clipper(int initOptions) : ClipperBase() //constructor
|
|
{
|
|
m_ActiveEdges = 0;
|
|
m_SortedEdges = 0;
|
|
m_ExecuteLocked = false;
|
|
m_UseFullRange = false;
|
|
m_ReverseOutput = ((initOptions & ioReverseSolution) != 0);
|
|
m_StrictSimple = ((initOptions & ioStrictlySimple) != 0);
|
|
m_PreserveCollinear = ((initOptions & ioPreserveCollinear) != 0);
|
|
m_HasOpenPaths = false;
|
|
#ifdef use_xyz
|
|
m_ZFill = 0;
|
|
#endif
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
Clipper::~Clipper() //destructor
|
|
{
|
|
Clear();
|
|
m_Scanbeam.clear();
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
#ifdef use_xyz
|
|
void Clipper::ZFillFunction(TZFillCallback zFillFunc)
|
|
{
|
|
m_ZFill = zFillFunc;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
#endif
|
|
|
|
void Clipper::Clear()
|
|
{
|
|
if (m_edges.empty()) return; //avoids problems with ClipperBase destructor
|
|
DisposeAllOutRecs();
|
|
ClipperBase::Clear();
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::Reset()
|
|
{
|
|
ClipperBase::Reset();
|
|
m_Scanbeam.clear();
|
|
m_ActiveEdges = 0;
|
|
m_SortedEdges = 0;
|
|
DisposeAllOutRecs();
|
|
LocalMinima* lm = m_MinimaList;
|
|
while (lm)
|
|
{
|
|
InsertScanbeam(lm->Y);
|
|
lm = lm->Next;
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool Clipper::Execute(ClipType clipType, Paths &solution,
|
|
PolyFillType subjFillType, PolyFillType clipFillType)
|
|
{
|
|
if( m_ExecuteLocked ) return false;
|
|
if (m_HasOpenPaths)
|
|
throw clipperException("Error: PolyTree struct is need for open path clipping.");
|
|
m_ExecuteLocked = true;
|
|
solution.resize(0);
|
|
m_SubjFillType = subjFillType;
|
|
m_ClipFillType = clipFillType;
|
|
m_ClipType = clipType;
|
|
m_UsingPolyTree = false;
|
|
bool succeeded = ExecuteInternal();
|
|
if (succeeded) BuildResult(solution);
|
|
m_ExecuteLocked = false;
|
|
return succeeded;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool Clipper::Execute(ClipType clipType, PolyTree& polytree,
|
|
PolyFillType subjFillType, PolyFillType clipFillType)
|
|
{
|
|
if( m_ExecuteLocked ) return false;
|
|
m_ExecuteLocked = true;
|
|
m_SubjFillType = subjFillType;
|
|
m_ClipFillType = clipFillType;
|
|
m_ClipType = clipType;
|
|
m_UsingPolyTree = true;
|
|
bool succeeded = ExecuteInternal();
|
|
if (succeeded) BuildResult2(polytree);
|
|
m_ExecuteLocked = false;
|
|
return succeeded;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::FixHoleLinkage(OutRec &outrec)
|
|
{
|
|
//skip OutRecs that (a) contain outermost polygons or
|
|
//(b) already have the correct owner/child linkage ...
|
|
if (!outrec.FirstLeft ||
|
|
(outrec.IsHole != outrec.FirstLeft->IsHole &&
|
|
outrec.FirstLeft->Pts)) return;
|
|
|
|
OutRec* orfl = outrec.FirstLeft;
|
|
while (orfl && ((orfl->IsHole == outrec.IsHole) || !orfl->Pts))
|
|
orfl = orfl->FirstLeft;
|
|
outrec.FirstLeft = orfl;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool Clipper::ExecuteInternal()
|
|
{
|
|
bool succeeded = true;
|
|
try {
|
|
Reset();
|
|
if (!m_CurrentLM) return false;
|
|
cInt botY = PopScanbeam();
|
|
do {
|
|
InsertLocalMinimaIntoAEL(botY);
|
|
ClearGhostJoins();
|
|
ProcessHorizontals(false);
|
|
if (m_Scanbeam.empty()) break;
|
|
cInt topY = PopScanbeam();
|
|
succeeded = ProcessIntersections(botY, topY);
|
|
if (!succeeded) break;
|
|
ProcessEdgesAtTopOfScanbeam(topY);
|
|
botY = topY;
|
|
} while (!m_Scanbeam.empty() || m_CurrentLM);
|
|
}
|
|
catch(...)
|
|
{
|
|
succeeded = false;
|
|
}
|
|
|
|
if (succeeded)
|
|
{
|
|
//fix orientations ...
|
|
for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i)
|
|
{
|
|
OutRec *outRec = m_PolyOuts[i];
|
|
if (!outRec->Pts || outRec->IsOpen) continue;
|
|
if ((outRec->IsHole ^ m_ReverseOutput) == (Area(*outRec) > 0))
|
|
ReversePolyPtLinks(outRec->Pts);
|
|
}
|
|
|
|
if (!m_Joins.empty()) JoinCommonEdges();
|
|
|
|
//unfortunately FixupOutPolygon() must be done after JoinCommonEdges()
|
|
for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i)
|
|
{
|
|
OutRec *outRec = m_PolyOuts[i];
|
|
if (outRec->Pts && !outRec->IsOpen)
|
|
FixupOutPolygon(*outRec);
|
|
}
|
|
|
|
if (m_StrictSimple) DoSimplePolygons();
|
|
}
|
|
|
|
ClearJoins();
|
|
ClearGhostJoins();
|
|
return succeeded;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::InsertScanbeam(const cInt Y)
|
|
{
|
|
m_Scanbeam.insert(Y);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
cInt Clipper::PopScanbeam()
|
|
{
|
|
cInt Y = *m_Scanbeam.begin();
|
|
m_Scanbeam.erase(m_Scanbeam.begin());
|
|
return Y;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::DisposeAllOutRecs(){
|
|
for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i)
|
|
DisposeOutRec(i);
|
|
m_PolyOuts.clear();
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::DisposeOutRec(PolyOutList::size_type index)
|
|
{
|
|
OutRec *outRec = m_PolyOuts[index];
|
|
if (outRec->Pts) DisposeOutPts(outRec->Pts);
|
|
delete outRec;
|
|
m_PolyOuts[index] = 0;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::SetWindingCount(TEdge &edge)
|
|
{
|
|
TEdge *e = edge.PrevInAEL;
|
|
//find the edge of the same polytype that immediately preceeds 'edge' in AEL
|
|
while (e && ((e->PolyTyp != edge.PolyTyp) || (e->WindDelta == 0))) e = e->PrevInAEL;
|
|
if (!e)
|
|
{
|
|
edge.WindCnt = (edge.WindDelta == 0 ? 1 : edge.WindDelta);
|
|
edge.WindCnt2 = 0;
|
|
e = m_ActiveEdges; //ie get ready to calc WindCnt2
|
|
}
|
|
else if (edge.WindDelta == 0 && m_ClipType != ctUnion)
|
|
{
|
|
edge.WindCnt = 1;
|
|
edge.WindCnt2 = e->WindCnt2;
|
|
e = e->NextInAEL; //ie get ready to calc WindCnt2
|
|
}
|
|
else if (IsEvenOddFillType(edge))
|
|
{
|
|
//EvenOdd filling ...
|
|
if (edge.WindDelta == 0)
|
|
{
|
|
//are we inside a subj polygon ...
|
|
bool Inside = true;
|
|
TEdge *e2 = e->PrevInAEL;
|
|
while (e2)
|
|
{
|
|
if (e2->PolyTyp == e->PolyTyp && e2->WindDelta != 0)
|
|
Inside = !Inside;
|
|
e2 = e2->PrevInAEL;
|
|
}
|
|
edge.WindCnt = (Inside ? 0 : 1);
|
|
}
|
|
else
|
|
{
|
|
edge.WindCnt = edge.WindDelta;
|
|
}
|
|
edge.WindCnt2 = e->WindCnt2;
|
|
e = e->NextInAEL; //ie get ready to calc WindCnt2
|
|
}
|
|
else
|
|
{
|
|
//nonZero, Positive or Negative filling ...
|
|
if (e->WindCnt * e->WindDelta < 0)
|
|
{
|
|
//prev edge is 'decreasing' WindCount (WC) toward zero
|
|
//so we're outside the previous polygon ...
|
|
if (Abs(e->WindCnt) > 1)
|
|
{
|
|
//outside prev poly but still inside another.
|
|
//when reversing direction of prev poly use the same WC
|
|
if (e->WindDelta * edge.WindDelta < 0) edge.WindCnt = e->WindCnt;
|
|
//otherwise continue to 'decrease' WC ...
|
|
else edge.WindCnt = e->WindCnt + edge.WindDelta;
|
|
}
|
|
else
|
|
//now outside all polys of same polytype so set own WC ...
|
|
edge.WindCnt = (edge.WindDelta == 0 ? 1 : edge.WindDelta);
|
|
} else
|
|
{
|
|
//prev edge is 'increasing' WindCount (WC) away from zero
|
|
//so we're inside the previous polygon ...
|
|
if (edge.WindDelta == 0)
|
|
edge.WindCnt = (e->WindCnt < 0 ? e->WindCnt - 1 : e->WindCnt + 1);
|
|
//if wind direction is reversing prev then use same WC
|
|
else if (e->WindDelta * edge.WindDelta < 0) edge.WindCnt = e->WindCnt;
|
|
//otherwise add to WC ...
|
|
else edge.WindCnt = e->WindCnt + edge.WindDelta;
|
|
}
|
|
edge.WindCnt2 = e->WindCnt2;
|
|
e = e->NextInAEL; //ie get ready to calc WindCnt2
|
|
}
|
|
|
|
//update WindCnt2 ...
|
|
if (IsEvenOddAltFillType(edge))
|
|
{
|
|
//EvenOdd filling ...
|
|
while (e != &edge)
|
|
{
|
|
if (e->WindDelta != 0)
|
|
edge.WindCnt2 = (edge.WindCnt2 == 0 ? 1 : 0);
|
|
e = e->NextInAEL;
|
|
}
|
|
} else
|
|
{
|
|
//nonZero, Positive or Negative filling ...
|
|
while ( e != &edge )
|
|
{
|
|
edge.WindCnt2 += e->WindDelta;
|
|
e = e->NextInAEL;
|
|
}
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool Clipper::IsEvenOddFillType(const TEdge& edge) const
|
|
{
|
|
if (edge.PolyTyp == ptSubject)
|
|
return m_SubjFillType == pftEvenOdd; else
|
|
return m_ClipFillType == pftEvenOdd;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool Clipper::IsEvenOddAltFillType(const TEdge& edge) const
|
|
{
|
|
if (edge.PolyTyp == ptSubject)
|
|
return m_ClipFillType == pftEvenOdd; else
|
|
return m_SubjFillType == pftEvenOdd;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool Clipper::IsContributing(const TEdge& edge) const
|
|
{
|
|
PolyFillType pft, pft2;
|
|
if (edge.PolyTyp == ptSubject)
|
|
{
|
|
pft = m_SubjFillType;
|
|
pft2 = m_ClipFillType;
|
|
} else
|
|
{
|
|
pft = m_ClipFillType;
|
|
pft2 = m_SubjFillType;
|
|
}
|
|
|
|
switch(pft)
|
|
{
|
|
case pftEvenOdd:
|
|
//return false if a subj line has been flagged as inside a subj polygon
|
|
if (edge.WindDelta == 0 && edge.WindCnt != 1) return false;
|
|
break;
|
|
case pftNonZero:
|
|
if (Abs(edge.WindCnt) != 1) return false;
|
|
break;
|
|
case pftPositive:
|
|
if (edge.WindCnt != 1) return false;
|
|
break;
|
|
default: //pftNegative
|
|
if (edge.WindCnt != -1) return false;
|
|
}
|
|
|
|
switch(m_ClipType)
|
|
{
|
|
case ctIntersection:
|
|
switch(pft2)
|
|
{
|
|
case pftEvenOdd:
|
|
case pftNonZero:
|
|
return (edge.WindCnt2 != 0);
|
|
case pftPositive:
|
|
return (edge.WindCnt2 > 0);
|
|
default:
|
|
return (edge.WindCnt2 < 0);
|
|
}
|
|
break;
|
|
case ctUnion:
|
|
switch(pft2)
|
|
{
|
|
case pftEvenOdd:
|
|
case pftNonZero:
|
|
return (edge.WindCnt2 == 0);
|
|
case pftPositive:
|
|
return (edge.WindCnt2 <= 0);
|
|
default:
|
|
return (edge.WindCnt2 >= 0);
|
|
}
|
|
break;
|
|
case ctDifference:
|
|
if (edge.PolyTyp == ptSubject)
|
|
switch(pft2)
|
|
{
|
|
case pftEvenOdd:
|
|
case pftNonZero:
|
|
return (edge.WindCnt2 == 0);
|
|
case pftPositive:
|
|
return (edge.WindCnt2 <= 0);
|
|
default:
|
|
return (edge.WindCnt2 >= 0);
|
|
}
|
|
else
|
|
switch(pft2)
|
|
{
|
|
case pftEvenOdd:
|
|
case pftNonZero:
|
|
return (edge.WindCnt2 != 0);
|
|
case pftPositive:
|
|
return (edge.WindCnt2 > 0);
|
|
default:
|
|
return (edge.WindCnt2 < 0);
|
|
}
|
|
break;
|
|
case ctXor:
|
|
if (edge.WindDelta == 0) //XOr always contributing unless open
|
|
switch(pft2)
|
|
{
|
|
case pftEvenOdd:
|
|
case pftNonZero:
|
|
return (edge.WindCnt2 == 0);
|
|
case pftPositive:
|
|
return (edge.WindCnt2 <= 0);
|
|
default:
|
|
return (edge.WindCnt2 >= 0);
|
|
}
|
|
else
|
|
return true;
|
|
break;
|
|
default:
|
|
return true;
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
OutPt* Clipper::AddLocalMinPoly(TEdge *e1, TEdge *e2, const IntPoint &Pt)
|
|
{
|
|
OutPt* result;
|
|
TEdge *e, *prevE;
|
|
if (IsHorizontal(*e2) || ( e1->Dx > e2->Dx ))
|
|
{
|
|
result = AddOutPt(e1, Pt);
|
|
e2->OutIdx = e1->OutIdx;
|
|
e1->Side = esLeft;
|
|
e2->Side = esRight;
|
|
e = e1;
|
|
if (e->PrevInAEL == e2)
|
|
prevE = e2->PrevInAEL;
|
|
else
|
|
prevE = e->PrevInAEL;
|
|
} else
|
|
{
|
|
result = AddOutPt(e2, Pt);
|
|
e1->OutIdx = e2->OutIdx;
|
|
e1->Side = esRight;
|
|
e2->Side = esLeft;
|
|
e = e2;
|
|
if (e->PrevInAEL == e1)
|
|
prevE = e1->PrevInAEL;
|
|
else
|
|
prevE = e->PrevInAEL;
|
|
}
|
|
|
|
if (prevE && prevE->OutIdx >= 0 &&
|
|
(TopX(*prevE, Pt.Y) == TopX(*e, Pt.Y)) &&
|
|
SlopesEqual(*e, *prevE, m_UseFullRange) &&
|
|
(e->WindDelta != 0) && (prevE->WindDelta != 0))
|
|
{
|
|
OutPt* outPt = AddOutPt(prevE, Pt);
|
|
AddJoin(result, outPt, e->Top);
|
|
}
|
|
return result;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::AddLocalMaxPoly(TEdge *e1, TEdge *e2, const IntPoint &Pt)
|
|
{
|
|
AddOutPt( e1, Pt );
|
|
if (e2->WindDelta == 0) AddOutPt(e2, Pt);
|
|
if( e1->OutIdx == e2->OutIdx )
|
|
{
|
|
e1->OutIdx = Unassigned;
|
|
e2->OutIdx = Unassigned;
|
|
}
|
|
else if (e1->OutIdx < e2->OutIdx)
|
|
AppendPolygon(e1, e2);
|
|
else
|
|
AppendPolygon(e2, e1);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::AddEdgeToSEL(TEdge *edge)
|
|
{
|
|
//SEL pointers in PEdge are reused to build a list of horizontal edges.
|
|
//However, we don't need to worry about order with horizontal edge processing.
|
|
if( !m_SortedEdges )
|
|
{
|
|
m_SortedEdges = edge;
|
|
edge->PrevInSEL = 0;
|
|
edge->NextInSEL = 0;
|
|
}
|
|
else
|
|
{
|
|
edge->NextInSEL = m_SortedEdges;
|
|
edge->PrevInSEL = 0;
|
|
m_SortedEdges->PrevInSEL = edge;
|
|
m_SortedEdges = edge;
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::CopyAELToSEL()
|
|
{
|
|
TEdge* e = m_ActiveEdges;
|
|
m_SortedEdges = e;
|
|
while ( e )
|
|
{
|
|
e->PrevInSEL = e->PrevInAEL;
|
|
e->NextInSEL = e->NextInAEL;
|
|
e = e->NextInAEL;
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::AddJoin(OutPt *op1, OutPt *op2, const IntPoint OffPt)
|
|
{
|
|
Join* j = new Join;
|
|
j->OutPt1 = op1;
|
|
j->OutPt2 = op2;
|
|
j->OffPt = OffPt;
|
|
m_Joins.push_back(j);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::ClearJoins()
|
|
{
|
|
for (JoinList::size_type i = 0; i < m_Joins.size(); i++)
|
|
delete m_Joins[i];
|
|
m_Joins.resize(0);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::ClearGhostJoins()
|
|
{
|
|
for (JoinList::size_type i = 0; i < m_GhostJoins.size(); i++)
|
|
delete m_GhostJoins[i];
|
|
m_GhostJoins.resize(0);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::AddGhostJoin(OutPt *op, const IntPoint OffPt)
|
|
{
|
|
Join* j = new Join;
|
|
j->OutPt1 = op;
|
|
j->OutPt2 = 0;
|
|
j->OffPt = OffPt;
|
|
m_GhostJoins.push_back(j);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::InsertLocalMinimaIntoAEL(const cInt botY)
|
|
{
|
|
while( m_CurrentLM && ( m_CurrentLM->Y == botY ) )
|
|
{
|
|
TEdge* lb = m_CurrentLM->LeftBound;
|
|
TEdge* rb = m_CurrentLM->RightBound;
|
|
PopLocalMinima();
|
|
OutPt *Op1 = 0;
|
|
if (!lb)
|
|
{
|
|
//nb: don't insert LB into either AEL or SEL
|
|
InsertEdgeIntoAEL(rb, 0);
|
|
SetWindingCount(*rb);
|
|
if (IsContributing(*rb))
|
|
Op1 = AddOutPt(rb, rb->Bot);
|
|
}
|
|
else if (!rb)
|
|
{
|
|
InsertEdgeIntoAEL(lb, 0);
|
|
SetWindingCount(*lb);
|
|
if (IsContributing(*lb))
|
|
Op1 = AddOutPt(lb, lb->Bot);
|
|
InsertScanbeam(lb->Top.Y);
|
|
}
|
|
else
|
|
{
|
|
InsertEdgeIntoAEL(lb, 0);
|
|
InsertEdgeIntoAEL(rb, lb);
|
|
SetWindingCount( *lb );
|
|
rb->WindCnt = lb->WindCnt;
|
|
rb->WindCnt2 = lb->WindCnt2;
|
|
if (IsContributing(*lb))
|
|
Op1 = AddLocalMinPoly(lb, rb, lb->Bot);
|
|
InsertScanbeam(lb->Top.Y);
|
|
}
|
|
|
|
if (rb)
|
|
{
|
|
if(IsHorizontal(*rb)) AddEdgeToSEL(rb);
|
|
else InsertScanbeam( rb->Top.Y );
|
|
}
|
|
|
|
if (!lb || !rb) continue;
|
|
|
|
//if any output polygons share an edge, they'll need joining later ...
|
|
if (Op1 && IsHorizontal(*rb) &&
|
|
m_GhostJoins.size() > 0 && (rb->WindDelta != 0))
|
|
{
|
|
for (JoinList::size_type i = 0; i < m_GhostJoins.size(); ++i)
|
|
{
|
|
Join* jr = m_GhostJoins[i];
|
|
//if the horizontal Rb and a 'ghost' horizontal overlap, then convert
|
|
//the 'ghost' join to a real join ready for later ...
|
|
if (HorzSegmentsOverlap(jr->OutPt1->Pt, jr->OffPt, rb->Bot, rb->Top))
|
|
AddJoin(jr->OutPt1, Op1, jr->OffPt);
|
|
}
|
|
}
|
|
|
|
if (lb->OutIdx >= 0 && lb->PrevInAEL &&
|
|
lb->PrevInAEL->Curr.X == lb->Bot.X &&
|
|
lb->PrevInAEL->OutIdx >= 0 &&
|
|
SlopesEqual(*lb->PrevInAEL, *lb, m_UseFullRange) &&
|
|
(lb->WindDelta != 0) && (lb->PrevInAEL->WindDelta != 0))
|
|
{
|
|
OutPt *Op2 = AddOutPt(lb->PrevInAEL, lb->Bot);
|
|
AddJoin(Op1, Op2, lb->Top);
|
|
}
|
|
|
|
if(lb->NextInAEL != rb)
|
|
{
|
|
|
|
if (rb->OutIdx >= 0 && rb->PrevInAEL->OutIdx >= 0 &&
|
|
SlopesEqual(*rb->PrevInAEL, *rb, m_UseFullRange) &&
|
|
(rb->WindDelta != 0) && (rb->PrevInAEL->WindDelta != 0))
|
|
{
|
|
OutPt *Op2 = AddOutPt(rb->PrevInAEL, rb->Bot);
|
|
AddJoin(Op1, Op2, rb->Top);
|
|
}
|
|
|
|
TEdge* e = lb->NextInAEL;
|
|
if (e)
|
|
{
|
|
while( e != rb )
|
|
{
|
|
//nb: For calculating winding counts etc, IntersectEdges() assumes
|
|
//that param1 will be to the Right of param2 ABOVE the intersection ...
|
|
IntersectEdges(rb , e , lb->Curr); //order important here
|
|
e = e->NextInAEL;
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::DeleteFromAEL(TEdge *e)
|
|
{
|
|
TEdge* AelPrev = e->PrevInAEL;
|
|
TEdge* AelNext = e->NextInAEL;
|
|
if( !AelPrev && !AelNext && (e != m_ActiveEdges) ) return; //already deleted
|
|
if( AelPrev ) AelPrev->NextInAEL = AelNext;
|
|
else m_ActiveEdges = AelNext;
|
|
if( AelNext ) AelNext->PrevInAEL = AelPrev;
|
|
e->NextInAEL = 0;
|
|
e->PrevInAEL = 0;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::DeleteFromSEL(TEdge *e)
|
|
{
|
|
TEdge* SelPrev = e->PrevInSEL;
|
|
TEdge* SelNext = e->NextInSEL;
|
|
if( !SelPrev && !SelNext && (e != m_SortedEdges) ) return; //already deleted
|
|
if( SelPrev ) SelPrev->NextInSEL = SelNext;
|
|
else m_SortedEdges = SelNext;
|
|
if( SelNext ) SelNext->PrevInSEL = SelPrev;
|
|
e->NextInSEL = 0;
|
|
e->PrevInSEL = 0;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
#ifdef use_xyz
|
|
|
|
void Clipper::SetZ(IntPoint& pt, TEdge& e)
|
|
{
|
|
pt.Z = 0;
|
|
if (m_ZFill)
|
|
{
|
|
//put the 'preferred' point as first parameter ...
|
|
if (e.OutIdx < 0)
|
|
(*m_ZFill)(e.Bot, e.Top, pt); //outside a path so presume entering
|
|
else
|
|
(*m_ZFill)(e.Top, e.Bot, pt); //inside a path so presume exiting
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
#endif
|
|
|
|
void Clipper::IntersectEdges(TEdge *e1, TEdge *e2,
|
|
const IntPoint &Pt, bool protect)
|
|
{
|
|
//e1 will be to the Left of e2 BELOW the intersection. Therefore e1 is before
|
|
//e2 in AEL except when e1 is being inserted at the intersection point ...
|
|
bool e1stops = !protect && !e1->NextInLML &&
|
|
e1->Top.X == Pt.X && e1->Top.Y == Pt.Y;
|
|
bool e2stops = !protect && !e2->NextInLML &&
|
|
e2->Top.X == Pt.X && e2->Top.Y == Pt.Y;
|
|
bool e1Contributing = ( e1->OutIdx >= 0 );
|
|
bool e2Contributing = ( e2->OutIdx >= 0 );
|
|
|
|
#ifdef use_lines
|
|
//if either edge is on an OPEN path ...
|
|
if (e1->WindDelta == 0 || e2->WindDelta == 0)
|
|
{
|
|
//ignore subject-subject open path intersections UNLESS they
|
|
//are both open paths, AND they are both 'contributing maximas' ...
|
|
if (e1->WindDelta == 0 && e2->WindDelta == 0)
|
|
{
|
|
if ((e1stops || e2stops) && e1Contributing && e2Contributing)
|
|
AddLocalMaxPoly(e1, e2, Pt);
|
|
}
|
|
|
|
//if intersecting a subj line with a subj poly ...
|
|
else if (e1->PolyTyp == e2->PolyTyp &&
|
|
e1->WindDelta != e2->WindDelta && m_ClipType == ctUnion)
|
|
{
|
|
if (e1->WindDelta == 0)
|
|
{
|
|
if (e2Contributing)
|
|
{
|
|
AddOutPt(e1, Pt);
|
|
if (e1Contributing) e1->OutIdx = Unassigned;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (e1Contributing)
|
|
{
|
|
AddOutPt(e2, Pt);
|
|
if (e2Contributing) e2->OutIdx = Unassigned;
|
|
}
|
|
}
|
|
}
|
|
else if (e1->PolyTyp != e2->PolyTyp)
|
|
{
|
|
//toggle subj open path OutIdx on/off when Abs(clip.WndCnt) == 1 ...
|
|
if ((e1->WindDelta == 0) && abs(e2->WindCnt) == 1 &&
|
|
(m_ClipType != ctUnion || e2->WindCnt2 == 0))
|
|
{
|
|
AddOutPt(e1, Pt);
|
|
if (e1Contributing) e1->OutIdx = Unassigned;
|
|
}
|
|
else if ((e2->WindDelta == 0) && (abs(e1->WindCnt) == 1) &&
|
|
(m_ClipType != ctUnion || e1->WindCnt2 == 0))
|
|
{
|
|
AddOutPt(e2, Pt);
|
|
if (e2Contributing) e2->OutIdx = Unassigned;
|
|
}
|
|
}
|
|
|
|
if (e1stops)
|
|
if (e1->OutIdx < 0) DeleteFromAEL(e1);
|
|
else throw clipperException("Error intersecting polylines");
|
|
if (e2stops)
|
|
if (e2->OutIdx < 0) DeleteFromAEL(e2);
|
|
else throw clipperException("Error intersecting polylines");
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
//update winding counts...
|
|
//assumes that e1 will be to the Right of e2 ABOVE the intersection
|
|
if ( e1->PolyTyp == e2->PolyTyp )
|
|
{
|
|
if ( IsEvenOddFillType( *e1) )
|
|
{
|
|
int oldE1WindCnt = e1->WindCnt;
|
|
e1->WindCnt = e2->WindCnt;
|
|
e2->WindCnt = oldE1WindCnt;
|
|
} else
|
|
{
|
|
if (e1->WindCnt + e2->WindDelta == 0 ) e1->WindCnt = -e1->WindCnt;
|
|
else e1->WindCnt += e2->WindDelta;
|
|
if ( e2->WindCnt - e1->WindDelta == 0 ) e2->WindCnt = -e2->WindCnt;
|
|
else e2->WindCnt -= e1->WindDelta;
|
|
}
|
|
} else
|
|
{
|
|
if (!IsEvenOddFillType(*e2)) e1->WindCnt2 += e2->WindDelta;
|
|
else e1->WindCnt2 = ( e1->WindCnt2 == 0 ) ? 1 : 0;
|
|
if (!IsEvenOddFillType(*e1)) e2->WindCnt2 -= e1->WindDelta;
|
|
else e2->WindCnt2 = ( e2->WindCnt2 == 0 ) ? 1 : 0;
|
|
}
|
|
|
|
PolyFillType e1FillType, e2FillType, e1FillType2, e2FillType2;
|
|
if (e1->PolyTyp == ptSubject)
|
|
{
|
|
e1FillType = m_SubjFillType;
|
|
e1FillType2 = m_ClipFillType;
|
|
} else
|
|
{
|
|
e1FillType = m_ClipFillType;
|
|
e1FillType2 = m_SubjFillType;
|
|
}
|
|
if (e2->PolyTyp == ptSubject)
|
|
{
|
|
e2FillType = m_SubjFillType;
|
|
e2FillType2 = m_ClipFillType;
|
|
} else
|
|
{
|
|
e2FillType = m_ClipFillType;
|
|
e2FillType2 = m_SubjFillType;
|
|
}
|
|
|
|
cInt e1Wc, e2Wc;
|
|
switch (e1FillType)
|
|
{
|
|
case pftPositive: e1Wc = e1->WindCnt; break;
|
|
case pftNegative: e1Wc = -e1->WindCnt; break;
|
|
default: e1Wc = Abs(e1->WindCnt);
|
|
}
|
|
switch(e2FillType)
|
|
{
|
|
case pftPositive: e2Wc = e2->WindCnt; break;
|
|
case pftNegative: e2Wc = -e2->WindCnt; break;
|
|
default: e2Wc = Abs(e2->WindCnt);
|
|
}
|
|
|
|
if ( e1Contributing && e2Contributing )
|
|
{
|
|
if ( e1stops || e2stops ||
|
|
(e1Wc != 0 && e1Wc != 1) || (e2Wc != 0 && e2Wc != 1) ||
|
|
(e1->PolyTyp != e2->PolyTyp && m_ClipType != ctXor) )
|
|
AddLocalMaxPoly(e1, e2, Pt);
|
|
else
|
|
{
|
|
AddOutPt(e1, Pt);
|
|
AddOutPt(e2, Pt);
|
|
SwapSides( *e1 , *e2 );
|
|
SwapPolyIndexes( *e1 , *e2 );
|
|
}
|
|
}
|
|
else if ( e1Contributing )
|
|
{
|
|
if (e2Wc == 0 || e2Wc == 1)
|
|
{
|
|
AddOutPt(e1, Pt);
|
|
SwapSides(*e1, *e2);
|
|
SwapPolyIndexes(*e1, *e2);
|
|
}
|
|
}
|
|
else if ( e2Contributing )
|
|
{
|
|
if (e1Wc == 0 || e1Wc == 1)
|
|
{
|
|
AddOutPt(e2, Pt);
|
|
SwapSides(*e1, *e2);
|
|
SwapPolyIndexes(*e1, *e2);
|
|
}
|
|
}
|
|
else if ( (e1Wc == 0 || e1Wc == 1) &&
|
|
(e2Wc == 0 || e2Wc == 1) && !e1stops && !e2stops )
|
|
{
|
|
//neither edge is currently contributing ...
|
|
|
|
cInt e1Wc2, e2Wc2;
|
|
switch (e1FillType2)
|
|
{
|
|
case pftPositive: e1Wc2 = e1->WindCnt2; break;
|
|
case pftNegative : e1Wc2 = -e1->WindCnt2; break;
|
|
default: e1Wc2 = Abs(e1->WindCnt2);
|
|
}
|
|
switch (e2FillType2)
|
|
{
|
|
case pftPositive: e2Wc2 = e2->WindCnt2; break;
|
|
case pftNegative: e2Wc2 = -e2->WindCnt2; break;
|
|
default: e2Wc2 = Abs(e2->WindCnt2);
|
|
}
|
|
|
|
if (e1->PolyTyp != e2->PolyTyp)
|
|
AddLocalMinPoly(e1, e2, Pt);
|
|
else if (e1Wc == 1 && e2Wc == 1)
|
|
switch( m_ClipType ) {
|
|
case ctIntersection:
|
|
if (e1Wc2 > 0 && e2Wc2 > 0)
|
|
AddLocalMinPoly(e1, e2, Pt);
|
|
break;
|
|
case ctUnion:
|
|
if ( e1Wc2 <= 0 && e2Wc2 <= 0 )
|
|
AddLocalMinPoly(e1, e2, Pt);
|
|
break;
|
|
case ctDifference:
|
|
if (((e1->PolyTyp == ptClip) && (e1Wc2 > 0) && (e2Wc2 > 0)) ||
|
|
((e1->PolyTyp == ptSubject) && (e1Wc2 <= 0) && (e2Wc2 <= 0)))
|
|
AddLocalMinPoly(e1, e2, Pt);
|
|
break;
|
|
case ctXor:
|
|
AddLocalMinPoly(e1, e2, Pt);
|
|
}
|
|
else
|
|
SwapSides( *e1, *e2 );
|
|
}
|
|
|
|
if( (e1stops != e2stops) &&
|
|
( (e1stops && (e1->OutIdx >= 0)) || (e2stops && (e2->OutIdx >= 0)) ) )
|
|
{
|
|
SwapSides( *e1, *e2 );
|
|
SwapPolyIndexes( *e1, *e2 );
|
|
}
|
|
|
|
//finally, delete any non-contributing maxima edges ...
|
|
if( e1stops ) DeleteFromAEL( e1 );
|
|
if( e2stops ) DeleteFromAEL( e2 );
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::SetHoleState(TEdge *e, OutRec *outrec)
|
|
{
|
|
bool IsHole = false;
|
|
TEdge *e2 = e->PrevInAEL;
|
|
while (e2)
|
|
{
|
|
if (e2->OutIdx >= 0 && e2->WindDelta != 0)
|
|
{
|
|
IsHole = !IsHole;
|
|
if (! outrec->FirstLeft)
|
|
outrec->FirstLeft = m_PolyOuts[e2->OutIdx];
|
|
}
|
|
e2 = e2->PrevInAEL;
|
|
}
|
|
if (IsHole) outrec->IsHole = true;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
OutRec* GetLowermostRec(OutRec *outRec1, OutRec *outRec2)
|
|
{
|
|
//work out which polygon fragment has the correct hole state ...
|
|
if (!outRec1->BottomPt)
|
|
outRec1->BottomPt = GetBottomPt(outRec1->Pts);
|
|
if (!outRec2->BottomPt)
|
|
outRec2->BottomPt = GetBottomPt(outRec2->Pts);
|
|
OutPt *OutPt1 = outRec1->BottomPt;
|
|
OutPt *OutPt2 = outRec2->BottomPt;
|
|
if (OutPt1->Pt.Y > OutPt2->Pt.Y) return outRec1;
|
|
else if (OutPt1->Pt.Y < OutPt2->Pt.Y) return outRec2;
|
|
else if (OutPt1->Pt.X < OutPt2->Pt.X) return outRec1;
|
|
else if (OutPt1->Pt.X > OutPt2->Pt.X) return outRec2;
|
|
else if (OutPt1->Next == OutPt1) return outRec2;
|
|
else if (OutPt2->Next == OutPt2) return outRec1;
|
|
else if (FirstIsBottomPt(OutPt1, OutPt2)) return outRec1;
|
|
else return outRec2;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool Param1RightOfParam2(OutRec* outRec1, OutRec* outRec2)
|
|
{
|
|
do
|
|
{
|
|
outRec1 = outRec1->FirstLeft;
|
|
if (outRec1 == outRec2) return true;
|
|
} while (outRec1);
|
|
return false;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
OutRec* Clipper::GetOutRec(int Idx)
|
|
{
|
|
OutRec* outrec = m_PolyOuts[Idx];
|
|
while (outrec != m_PolyOuts[outrec->Idx])
|
|
outrec = m_PolyOuts[outrec->Idx];
|
|
return outrec;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::AppendPolygon(TEdge *e1, TEdge *e2)
|
|
{
|
|
//get the start and ends of both output polygons ...
|
|
OutRec *outRec1 = m_PolyOuts[e1->OutIdx];
|
|
OutRec *outRec2 = m_PolyOuts[e2->OutIdx];
|
|
|
|
OutRec *holeStateRec;
|
|
if (Param1RightOfParam2(outRec1, outRec2))
|
|
holeStateRec = outRec2;
|
|
else if (Param1RightOfParam2(outRec2, outRec1))
|
|
holeStateRec = outRec1;
|
|
else
|
|
holeStateRec = GetLowermostRec(outRec1, outRec2);
|
|
|
|
//get the start and ends of both output polygons and
|
|
//join e2 poly onto e1 poly and delete pointers to e2 ...
|
|
|
|
OutPt* p1_lft = outRec1->Pts;
|
|
OutPt* p1_rt = p1_lft->Prev;
|
|
OutPt* p2_lft = outRec2->Pts;
|
|
OutPt* p2_rt = p2_lft->Prev;
|
|
|
|
EdgeSide Side;
|
|
//join e2 poly onto e1 poly and delete pointers to e2 ...
|
|
if( e1->Side == esLeft )
|
|
{
|
|
if( e2->Side == esLeft )
|
|
{
|
|
//z y x a b c
|
|
ReversePolyPtLinks(p2_lft);
|
|
p2_lft->Next = p1_lft;
|
|
p1_lft->Prev = p2_lft;
|
|
p1_rt->Next = p2_rt;
|
|
p2_rt->Prev = p1_rt;
|
|
outRec1->Pts = p2_rt;
|
|
} else
|
|
{
|
|
//x y z a b c
|
|
p2_rt->Next = p1_lft;
|
|
p1_lft->Prev = p2_rt;
|
|
p2_lft->Prev = p1_rt;
|
|
p1_rt->Next = p2_lft;
|
|
outRec1->Pts = p2_lft;
|
|
}
|
|
Side = esLeft;
|
|
} else
|
|
{
|
|
if( e2->Side == esRight )
|
|
{
|
|
//a b c z y x
|
|
ReversePolyPtLinks(p2_lft);
|
|
p1_rt->Next = p2_rt;
|
|
p2_rt->Prev = p1_rt;
|
|
p2_lft->Next = p1_lft;
|
|
p1_lft->Prev = p2_lft;
|
|
} else
|
|
{
|
|
//a b c x y z
|
|
p1_rt->Next = p2_lft;
|
|
p2_lft->Prev = p1_rt;
|
|
p1_lft->Prev = p2_rt;
|
|
p2_rt->Next = p1_lft;
|
|
}
|
|
Side = esRight;
|
|
}
|
|
|
|
outRec1->BottomPt = 0;
|
|
if (holeStateRec == outRec2)
|
|
{
|
|
if (outRec2->FirstLeft != outRec1)
|
|
outRec1->FirstLeft = outRec2->FirstLeft;
|
|
outRec1->IsHole = outRec2->IsHole;
|
|
}
|
|
outRec2->Pts = 0;
|
|
outRec2->BottomPt = 0;
|
|
outRec2->FirstLeft = outRec1;
|
|
|
|
int OKIdx = e1->OutIdx;
|
|
int ObsoleteIdx = e2->OutIdx;
|
|
|
|
e1->OutIdx = Unassigned; //nb: safe because we only get here via AddLocalMaxPoly
|
|
e2->OutIdx = Unassigned;
|
|
|
|
TEdge* e = m_ActiveEdges;
|
|
while( e )
|
|
{
|
|
if( e->OutIdx == ObsoleteIdx )
|
|
{
|
|
e->OutIdx = OKIdx;
|
|
e->Side = Side;
|
|
break;
|
|
}
|
|
e = e->NextInAEL;
|
|
}
|
|
|
|
outRec2->Idx = outRec1->Idx;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
OutRec* Clipper::CreateOutRec()
|
|
{
|
|
OutRec* result = new OutRec;
|
|
result->IsHole = false;
|
|
result->IsOpen = false;
|
|
result->FirstLeft = 0;
|
|
result->Pts = 0;
|
|
result->BottomPt = 0;
|
|
result->PolyNd = 0;
|
|
m_PolyOuts.push_back(result);
|
|
result->Idx = (int)m_PolyOuts.size()-1;
|
|
return result;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
OutPt* Clipper::AddOutPt(TEdge *e, const IntPoint &pt)
|
|
{
|
|
bool ToFront = (e->Side == esLeft);
|
|
if( e->OutIdx < 0 )
|
|
{
|
|
OutRec *outRec = CreateOutRec();
|
|
outRec->IsOpen = (e->WindDelta == 0);
|
|
OutPt* newOp = new OutPt;
|
|
outRec->Pts = newOp;
|
|
newOp->Idx = outRec->Idx;
|
|
newOp->Pt = pt;
|
|
newOp->Next = newOp;
|
|
newOp->Prev = newOp;
|
|
if (!outRec->IsOpen)
|
|
SetHoleState(e, outRec);
|
|
#ifdef use_xyz
|
|
if (pt == e->Bot) newOp->Pt = e->Bot;
|
|
else if (pt == e->Top) newOp->Pt = e->Top;
|
|
else SetZ(newOp->Pt, *e);
|
|
#endif
|
|
e->OutIdx = outRec->Idx; //nb: do this after SetZ !
|
|
return newOp;
|
|
} else
|
|
{
|
|
OutRec *outRec = m_PolyOuts[e->OutIdx];
|
|
//OutRec.Pts is the 'Left-most' point & OutRec.Pts.Prev is the 'Right-most'
|
|
OutPt* op = outRec->Pts;
|
|
|
|
if (ToFront && (pt == op->Pt)) return op;
|
|
else if (!ToFront && (pt == op->Prev->Pt)) return op->Prev;
|
|
|
|
OutPt* newOp = new OutPt;
|
|
newOp->Idx = outRec->Idx;
|
|
newOp->Pt = pt;
|
|
newOp->Next = op;
|
|
newOp->Prev = op->Prev;
|
|
newOp->Prev->Next = newOp;
|
|
op->Prev = newOp;
|
|
if (ToFront) outRec->Pts = newOp;
|
|
#ifdef use_xyz
|
|
if (pt == e->Bot) newOp->Pt = e->Bot;
|
|
else if (pt == e->Top) newOp->Pt = e->Top;
|
|
else SetZ(newOp->Pt, *e);
|
|
#endif
|
|
return newOp;
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::ProcessHorizontals(bool IsTopOfScanbeam)
|
|
{
|
|
TEdge* horzEdge = m_SortedEdges;
|
|
while(horzEdge)
|
|
{
|
|
DeleteFromSEL(horzEdge);
|
|
ProcessHorizontal(horzEdge, IsTopOfScanbeam);
|
|
horzEdge = m_SortedEdges;
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
inline bool IsMinima(TEdge *e)
|
|
{
|
|
return e && (e->Prev->NextInLML != e) && (e->Next->NextInLML != e);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
inline bool IsMaxima(TEdge *e, const cInt Y)
|
|
{
|
|
return e && e->Top.Y == Y && !e->NextInLML;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
inline bool IsIntermediate(TEdge *e, const cInt Y)
|
|
{
|
|
return e->Top.Y == Y && e->NextInLML;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
TEdge *GetMaximaPair(TEdge *e)
|
|
{
|
|
TEdge* result = 0;
|
|
if ((e->Next->Top == e->Top) && !e->Next->NextInLML)
|
|
result = e->Next;
|
|
else if ((e->Prev->Top == e->Top) && !e->Prev->NextInLML)
|
|
result = e->Prev;
|
|
|
|
if (result && (result->OutIdx == Skip ||
|
|
//result is false if both NextInAEL & PrevInAEL are nil & not horizontal ...
|
|
(result->NextInAEL == result->PrevInAEL && !IsHorizontal(*result))))
|
|
return 0;
|
|
return result;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::SwapPositionsInAEL(TEdge *Edge1, TEdge *Edge2)
|
|
{
|
|
//check that one or other edge hasn't already been removed from AEL ...
|
|
if (Edge1->NextInAEL == Edge1->PrevInAEL ||
|
|
Edge2->NextInAEL == Edge2->PrevInAEL) return;
|
|
|
|
if( Edge1->NextInAEL == Edge2 )
|
|
{
|
|
TEdge* Next = Edge2->NextInAEL;
|
|
if( Next ) Next->PrevInAEL = Edge1;
|
|
TEdge* Prev = Edge1->PrevInAEL;
|
|
if( Prev ) Prev->NextInAEL = Edge2;
|
|
Edge2->PrevInAEL = Prev;
|
|
Edge2->NextInAEL = Edge1;
|
|
Edge1->PrevInAEL = Edge2;
|
|
Edge1->NextInAEL = Next;
|
|
}
|
|
else if( Edge2->NextInAEL == Edge1 )
|
|
{
|
|
TEdge* Next = Edge1->NextInAEL;
|
|
if( Next ) Next->PrevInAEL = Edge2;
|
|
TEdge* Prev = Edge2->PrevInAEL;
|
|
if( Prev ) Prev->NextInAEL = Edge1;
|
|
Edge1->PrevInAEL = Prev;
|
|
Edge1->NextInAEL = Edge2;
|
|
Edge2->PrevInAEL = Edge1;
|
|
Edge2->NextInAEL = Next;
|
|
}
|
|
else
|
|
{
|
|
TEdge* Next = Edge1->NextInAEL;
|
|
TEdge* Prev = Edge1->PrevInAEL;
|
|
Edge1->NextInAEL = Edge2->NextInAEL;
|
|
if( Edge1->NextInAEL ) Edge1->NextInAEL->PrevInAEL = Edge1;
|
|
Edge1->PrevInAEL = Edge2->PrevInAEL;
|
|
if( Edge1->PrevInAEL ) Edge1->PrevInAEL->NextInAEL = Edge1;
|
|
Edge2->NextInAEL = Next;
|
|
if( Edge2->NextInAEL ) Edge2->NextInAEL->PrevInAEL = Edge2;
|
|
Edge2->PrevInAEL = Prev;
|
|
if( Edge2->PrevInAEL ) Edge2->PrevInAEL->NextInAEL = Edge2;
|
|
}
|
|
|
|
if( !Edge1->PrevInAEL ) m_ActiveEdges = Edge1;
|
|
else if( !Edge2->PrevInAEL ) m_ActiveEdges = Edge2;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::SwapPositionsInSEL(TEdge *Edge1, TEdge *Edge2)
|
|
{
|
|
if( !( Edge1->NextInSEL ) && !( Edge1->PrevInSEL ) ) return;
|
|
if( !( Edge2->NextInSEL ) && !( Edge2->PrevInSEL ) ) return;
|
|
|
|
if( Edge1->NextInSEL == Edge2 )
|
|
{
|
|
TEdge* Next = Edge2->NextInSEL;
|
|
if( Next ) Next->PrevInSEL = Edge1;
|
|
TEdge* Prev = Edge1->PrevInSEL;
|
|
if( Prev ) Prev->NextInSEL = Edge2;
|
|
Edge2->PrevInSEL = Prev;
|
|
Edge2->NextInSEL = Edge1;
|
|
Edge1->PrevInSEL = Edge2;
|
|
Edge1->NextInSEL = Next;
|
|
}
|
|
else if( Edge2->NextInSEL == Edge1 )
|
|
{
|
|
TEdge* Next = Edge1->NextInSEL;
|
|
if( Next ) Next->PrevInSEL = Edge2;
|
|
TEdge* Prev = Edge2->PrevInSEL;
|
|
if( Prev ) Prev->NextInSEL = Edge1;
|
|
Edge1->PrevInSEL = Prev;
|
|
Edge1->NextInSEL = Edge2;
|
|
Edge2->PrevInSEL = Edge1;
|
|
Edge2->NextInSEL = Next;
|
|
}
|
|
else
|
|
{
|
|
TEdge* Next = Edge1->NextInSEL;
|
|
TEdge* Prev = Edge1->PrevInSEL;
|
|
Edge1->NextInSEL = Edge2->NextInSEL;
|
|
if( Edge1->NextInSEL ) Edge1->NextInSEL->PrevInSEL = Edge1;
|
|
Edge1->PrevInSEL = Edge2->PrevInSEL;
|
|
if( Edge1->PrevInSEL ) Edge1->PrevInSEL->NextInSEL = Edge1;
|
|
Edge2->NextInSEL = Next;
|
|
if( Edge2->NextInSEL ) Edge2->NextInSEL->PrevInSEL = Edge2;
|
|
Edge2->PrevInSEL = Prev;
|
|
if( Edge2->PrevInSEL ) Edge2->PrevInSEL->NextInSEL = Edge2;
|
|
}
|
|
|
|
if( !Edge1->PrevInSEL ) m_SortedEdges = Edge1;
|
|
else if( !Edge2->PrevInSEL ) m_SortedEdges = Edge2;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
TEdge* GetNextInAEL(TEdge *e, Direction dir)
|
|
{
|
|
return dir == dLeftToRight ? e->NextInAEL : e->PrevInAEL;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void GetHorzDirection(TEdge& HorzEdge, Direction& Dir, cInt& Left, cInt& Right)
|
|
{
|
|
if (HorzEdge.Bot.X < HorzEdge.Top.X)
|
|
{
|
|
Left = HorzEdge.Bot.X;
|
|
Right = HorzEdge.Top.X;
|
|
Dir = dLeftToRight;
|
|
} else
|
|
{
|
|
Left = HorzEdge.Top.X;
|
|
Right = HorzEdge.Bot.X;
|
|
Dir = dRightToLeft;
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------
|
|
|
|
void Clipper::PrepareHorzJoins(TEdge* horzEdge, bool isTopOfScanbeam)
|
|
{
|
|
//get the last Op for this horizontal edge
|
|
//the point may be anywhere along the horizontal ...
|
|
OutPt* outPt = m_PolyOuts[horzEdge->OutIdx]->Pts;
|
|
if (horzEdge->Side != esLeft) outPt = outPt->Prev;
|
|
|
|
//First, match up overlapping horizontal edges (eg when one polygon's
|
|
//intermediate horz edge overlaps an intermediate horz edge of another, or
|
|
//when one polygon sits on top of another) ...
|
|
for (JoinList::size_type i = 0; i < m_GhostJoins.size(); ++i)
|
|
{
|
|
Join* j = m_GhostJoins[i];
|
|
if (HorzSegmentsOverlap(j->OutPt1->Pt, j->OffPt, horzEdge->Bot, horzEdge->Top))
|
|
AddJoin(j->OutPt1, outPt, j->OffPt);
|
|
}
|
|
//Also, since horizontal edges at the top of one SB are often removed from
|
|
//the AEL before we process the horizontal edges at the bottom of the next,
|
|
//we need to create 'ghost' Join records of 'contrubuting' horizontals that
|
|
//we can compare with horizontals at the bottom of the next SB.
|
|
if (isTopOfScanbeam)
|
|
{
|
|
if (outPt->Pt == horzEdge->Top)
|
|
AddGhostJoin(outPt, horzEdge->Bot);
|
|
else
|
|
AddGhostJoin(outPt, horzEdge->Top);
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
/*******************************************************************************
|
|
* Notes: Horizontal edges (HEs) at scanline intersections (ie at the Top or *
|
|
* Bottom of a scanbeam) are processed as if layered. The order in which HEs *
|
|
* are processed doesn't matter. HEs intersect with other HE Bot.Xs only [#] *
|
|
* (or they could intersect with Top.Xs only, ie EITHER Bot.Xs OR Top.Xs), *
|
|
* and with other non-horizontal edges [*]. Once these intersections are *
|
|
* processed, intermediate HEs then 'promote' the Edge above (NextInLML) into *
|
|
* the AEL. These 'promoted' edges may in turn intersect [%] with other HEs. *
|
|
*******************************************************************************/
|
|
|
|
void Clipper::ProcessHorizontal(TEdge *horzEdge, bool isTopOfScanbeam)
|
|
{
|
|
Direction dir;
|
|
cInt horzLeft, horzRight;
|
|
|
|
GetHorzDirection(*horzEdge, dir, horzLeft, horzRight);
|
|
|
|
TEdge* eLastHorz = horzEdge, *eMaxPair = 0;
|
|
while (eLastHorz->NextInLML && IsHorizontal(*eLastHorz->NextInLML))
|
|
eLastHorz = eLastHorz->NextInLML;
|
|
if (!eLastHorz->NextInLML)
|
|
eMaxPair = GetMaximaPair(eLastHorz);
|
|
|
|
for (;;)
|
|
{
|
|
bool IsLastHorz = (horzEdge == eLastHorz);
|
|
TEdge* e = GetNextInAEL(horzEdge, dir);
|
|
while(e)
|
|
{
|
|
//Break if we've got to the end of an intermediate horizontal edge ...
|
|
//nb: Smaller Dx's are to the right of larger Dx's ABOVE the horizontal.
|
|
if (e->Curr.X == horzEdge->Top.X && horzEdge->NextInLML &&
|
|
e->Dx < horzEdge->NextInLML->Dx) break;
|
|
|
|
TEdge* eNext = GetNextInAEL(e, dir); //saves eNext for later
|
|
|
|
if ((dir == dLeftToRight && e->Curr.X <= horzRight) ||
|
|
(dir == dRightToLeft && e->Curr.X >= horzLeft))
|
|
{
|
|
if (horzEdge->OutIdx >= 0 && horzEdge->WindDelta != 0)
|
|
PrepareHorzJoins(horzEdge, isTopOfScanbeam);
|
|
//so far we're still in range of the horizontal Edge but make sure
|
|
//we're at the last of consec. horizontals when matching with eMaxPair
|
|
if(e == eMaxPair && IsLastHorz)
|
|
{
|
|
if (dir == dLeftToRight)
|
|
IntersectEdges(horzEdge, e, e->Top);
|
|
else
|
|
IntersectEdges(e, horzEdge, e->Top);
|
|
if (eMaxPair->OutIdx >= 0) throw clipperException("ProcessHorizontal error");
|
|
return;
|
|
}
|
|
else if(dir == dLeftToRight)
|
|
{
|
|
IntPoint Pt = IntPoint(e->Curr.X, horzEdge->Curr.Y);
|
|
IntersectEdges(horzEdge, e, Pt, true);
|
|
}
|
|
else
|
|
{
|
|
IntPoint Pt = IntPoint(e->Curr.X, horzEdge->Curr.Y);
|
|
IntersectEdges( e, horzEdge, Pt, true);
|
|
}
|
|
SwapPositionsInAEL( horzEdge, e );
|
|
}
|
|
else if( (dir == dLeftToRight && e->Curr.X >= horzRight) ||
|
|
(dir == dRightToLeft && e->Curr.X <= horzLeft) ) break;
|
|
e = eNext;
|
|
} //end while
|
|
|
|
if (horzEdge->OutIdx >= 0 && horzEdge->WindDelta != 0)
|
|
PrepareHorzJoins(horzEdge, isTopOfScanbeam);
|
|
|
|
if (horzEdge->NextInLML && IsHorizontal(*horzEdge->NextInLML))
|
|
{
|
|
UpdateEdgeIntoAEL(horzEdge);
|
|
if (horzEdge->OutIdx >= 0) AddOutPt(horzEdge, horzEdge->Bot);
|
|
GetHorzDirection(*horzEdge, dir, horzLeft, horzRight);
|
|
} else
|
|
break;
|
|
} //end for (;;)
|
|
|
|
if(horzEdge->NextInLML)
|
|
{
|
|
if(horzEdge->OutIdx >= 0)
|
|
{
|
|
OutPt* op1 = AddOutPt( horzEdge, horzEdge->Top);
|
|
UpdateEdgeIntoAEL(horzEdge);
|
|
if (horzEdge->WindDelta == 0) return;
|
|
//nb: HorzEdge is no longer horizontal here
|
|
TEdge* ePrev = horzEdge->PrevInAEL;
|
|
TEdge* eNext = horzEdge->NextInAEL;
|
|
if (ePrev && ePrev->Curr.X == horzEdge->Bot.X &&
|
|
ePrev->Curr.Y == horzEdge->Bot.Y && ePrev->WindDelta != 0 &&
|
|
(ePrev->OutIdx >= 0 && ePrev->Curr.Y > ePrev->Top.Y &&
|
|
SlopesEqual(*horzEdge, *ePrev, m_UseFullRange)))
|
|
{
|
|
OutPt* op2 = AddOutPt(ePrev, horzEdge->Bot);
|
|
AddJoin(op1, op2, horzEdge->Top);
|
|
}
|
|
else if (eNext && eNext->Curr.X == horzEdge->Bot.X &&
|
|
eNext->Curr.Y == horzEdge->Bot.Y && eNext->WindDelta != 0 &&
|
|
eNext->OutIdx >= 0 && eNext->Curr.Y > eNext->Top.Y &&
|
|
SlopesEqual(*horzEdge, *eNext, m_UseFullRange))
|
|
{
|
|
OutPt* op2 = AddOutPt(eNext, horzEdge->Bot);
|
|
AddJoin(op1, op2, horzEdge->Top);
|
|
}
|
|
}
|
|
else
|
|
UpdateEdgeIntoAEL(horzEdge);
|
|
}
|
|
else if (eMaxPair)
|
|
{
|
|
if (eMaxPair->OutIdx >= 0)
|
|
{
|
|
if (dir == dLeftToRight)
|
|
IntersectEdges(horzEdge, eMaxPair, horzEdge->Top);
|
|
else
|
|
IntersectEdges(eMaxPair, horzEdge, horzEdge->Top);
|
|
if (eMaxPair->OutIdx >= 0)
|
|
throw clipperException("ProcessHorizontal error");
|
|
} else
|
|
{
|
|
DeleteFromAEL(horzEdge);
|
|
DeleteFromAEL(eMaxPair);
|
|
}
|
|
} else
|
|
{
|
|
if (horzEdge->OutIdx >= 0) AddOutPt(horzEdge, horzEdge->Top);
|
|
DeleteFromAEL(horzEdge);
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::UpdateEdgeIntoAEL(TEdge *&e)
|
|
{
|
|
if( !e->NextInLML ) throw
|
|
clipperException("UpdateEdgeIntoAEL: invalid call");
|
|
|
|
e->NextInLML->OutIdx = e->OutIdx;
|
|
TEdge* AelPrev = e->PrevInAEL;
|
|
TEdge* AelNext = e->NextInAEL;
|
|
if (AelPrev) AelPrev->NextInAEL = e->NextInLML;
|
|
else m_ActiveEdges = e->NextInLML;
|
|
if (AelNext) AelNext->PrevInAEL = e->NextInLML;
|
|
e->NextInLML->Side = e->Side;
|
|
e->NextInLML->WindDelta = e->WindDelta;
|
|
e->NextInLML->WindCnt = e->WindCnt;
|
|
e->NextInLML->WindCnt2 = e->WindCnt2;
|
|
e = e->NextInLML;
|
|
e->Curr = e->Bot;
|
|
e->PrevInAEL = AelPrev;
|
|
e->NextInAEL = AelNext;
|
|
if (!IsHorizontal(*e)) InsertScanbeam(e->Top.Y);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool Clipper::ProcessIntersections(const cInt botY, const cInt topY)
|
|
{
|
|
if( !m_ActiveEdges ) return true;
|
|
try {
|
|
BuildIntersectList(botY, topY);
|
|
size_t IlSize = m_IntersectList.size();
|
|
if (IlSize == 0) return true;
|
|
if (IlSize == 1 || FixupIntersectionOrder()) ProcessIntersectList();
|
|
else return false;
|
|
}
|
|
catch(...)
|
|
{
|
|
m_SortedEdges = 0;
|
|
DisposeIntersectNodes();
|
|
throw clipperException("ProcessIntersections error");
|
|
}
|
|
m_SortedEdges = 0;
|
|
return true;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::DisposeIntersectNodes()
|
|
{
|
|
for (size_t i = 0; i < m_IntersectList.size(); ++i )
|
|
delete m_IntersectList[i];
|
|
m_IntersectList.clear();
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::BuildIntersectList(const cInt botY, const cInt topY)
|
|
{
|
|
if ( !m_ActiveEdges ) return;
|
|
|
|
//prepare for sorting ...
|
|
TEdge* e = m_ActiveEdges;
|
|
m_SortedEdges = e;
|
|
while( e )
|
|
{
|
|
e->PrevInSEL = e->PrevInAEL;
|
|
e->NextInSEL = e->NextInAEL;
|
|
e->Curr.X = TopX( *e, topY );
|
|
e = e->NextInAEL;
|
|
}
|
|
|
|
//bubblesort ...
|
|
bool isModified;
|
|
do
|
|
{
|
|
isModified = false;
|
|
e = m_SortedEdges;
|
|
while( e->NextInSEL )
|
|
{
|
|
TEdge *eNext = e->NextInSEL;
|
|
IntPoint Pt;
|
|
if(e->Curr.X > eNext->Curr.X)
|
|
{
|
|
if (!IntersectPoint(*e, *eNext, Pt, m_UseFullRange) && e->Curr.X > eNext->Curr.X +1)
|
|
throw clipperException("Intersection error");
|
|
if (Pt.Y > botY)
|
|
{
|
|
Pt.Y = botY;
|
|
if (std::fabs(e->Dx) > std::fabs(eNext->Dx))
|
|
Pt.X = TopX(*eNext, botY); else
|
|
Pt.X = TopX(*e, botY);
|
|
}
|
|
|
|
IntersectNode * newNode = new IntersectNode;
|
|
newNode->Edge1 = e;
|
|
newNode->Edge2 = eNext;
|
|
newNode->Pt = Pt;
|
|
m_IntersectList.push_back(newNode);
|
|
|
|
SwapPositionsInSEL(e, eNext);
|
|
isModified = true;
|
|
}
|
|
else
|
|
e = eNext;
|
|
}
|
|
if( e->PrevInSEL ) e->PrevInSEL->NextInSEL = 0;
|
|
else break;
|
|
}
|
|
while ( isModified );
|
|
m_SortedEdges = 0; //important
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
|
|
void Clipper::ProcessIntersectList()
|
|
{
|
|
for (size_t i = 0; i < m_IntersectList.size(); ++i)
|
|
{
|
|
IntersectNode* iNode = m_IntersectList[i];
|
|
{
|
|
IntersectEdges( iNode->Edge1, iNode->Edge2, iNode->Pt, true);
|
|
SwapPositionsInAEL( iNode->Edge1 , iNode->Edge2 );
|
|
}
|
|
delete iNode;
|
|
}
|
|
m_IntersectList.clear();
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool IntersectListSort(IntersectNode* node1, IntersectNode* node2)
|
|
{
|
|
return node2->Pt.Y < node1->Pt.Y;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
inline bool EdgesAdjacent(const IntersectNode &inode)
|
|
{
|
|
return (inode.Edge1->NextInSEL == inode.Edge2) ||
|
|
(inode.Edge1->PrevInSEL == inode.Edge2);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool Clipper::FixupIntersectionOrder()
|
|
{
|
|
//pre-condition: intersections are sorted Bottom-most first.
|
|
//Now it's crucial that intersections are made only between adjacent edges,
|
|
//so to ensure this the order of intersections may need adjusting ...
|
|
CopyAELToSEL();
|
|
std::sort(m_IntersectList.begin(), m_IntersectList.end(), IntersectListSort);
|
|
size_t cnt = m_IntersectList.size();
|
|
for (size_t i = 0; i < cnt; ++i)
|
|
{
|
|
if (!EdgesAdjacent(*m_IntersectList[i]))
|
|
{
|
|
size_t j = i + 1;
|
|
while (j < cnt && !EdgesAdjacent(*m_IntersectList[j])) j++;
|
|
if (j == cnt) return false;
|
|
std::swap(m_IntersectList[i], m_IntersectList[j]);
|
|
}
|
|
SwapPositionsInSEL(m_IntersectList[i]->Edge1, m_IntersectList[i]->Edge2);
|
|
}
|
|
return true;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::DoMaxima(TEdge *e)
|
|
{
|
|
TEdge* eMaxPair = GetMaximaPair(e);
|
|
if (!eMaxPair)
|
|
{
|
|
if (e->OutIdx >= 0)
|
|
AddOutPt(e, e->Top);
|
|
DeleteFromAEL(e);
|
|
return;
|
|
}
|
|
|
|
TEdge* eNext = e->NextInAEL;
|
|
while(eNext && eNext != eMaxPair)
|
|
{
|
|
IntersectEdges(e, eNext, e->Top, true);
|
|
SwapPositionsInAEL(e, eNext);
|
|
eNext = e->NextInAEL;
|
|
}
|
|
|
|
if(e->OutIdx == Unassigned && eMaxPair->OutIdx == Unassigned)
|
|
{
|
|
DeleteFromAEL(e);
|
|
DeleteFromAEL(eMaxPair);
|
|
}
|
|
else if( e->OutIdx >= 0 && eMaxPair->OutIdx >= 0 )
|
|
{
|
|
IntersectEdges( e, eMaxPair, e->Top);
|
|
}
|
|
#ifdef use_lines
|
|
else if (e->WindDelta == 0)
|
|
{
|
|
if (e->OutIdx >= 0)
|
|
{
|
|
AddOutPt(e, e->Top);
|
|
e->OutIdx = Unassigned;
|
|
}
|
|
DeleteFromAEL(e);
|
|
|
|
if (eMaxPair->OutIdx >= 0)
|
|
{
|
|
AddOutPt(eMaxPair, e->Top);
|
|
eMaxPair->OutIdx = Unassigned;
|
|
}
|
|
DeleteFromAEL(eMaxPair);
|
|
}
|
|
#endif
|
|
else throw clipperException("DoMaxima error");
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::ProcessEdgesAtTopOfScanbeam(const cInt topY)
|
|
{
|
|
TEdge* e = m_ActiveEdges;
|
|
while( e )
|
|
{
|
|
//1. process maxima, treating them as if they're 'bent' horizontal edges,
|
|
// but exclude maxima with horizontal edges. nb: e can't be a horizontal.
|
|
bool IsMaximaEdge = IsMaxima(e, topY);
|
|
|
|
if(IsMaximaEdge)
|
|
{
|
|
TEdge* eMaxPair = GetMaximaPair(e);
|
|
IsMaximaEdge = (!eMaxPair || !IsHorizontal(*eMaxPair));
|
|
}
|
|
|
|
if(IsMaximaEdge)
|
|
{
|
|
TEdge* ePrev = e->PrevInAEL;
|
|
DoMaxima(e);
|
|
if( !ePrev ) e = m_ActiveEdges;
|
|
else e = ePrev->NextInAEL;
|
|
}
|
|
else
|
|
{
|
|
//2. promote horizontal edges, otherwise update Curr.X and Curr.Y ...
|
|
if (IsIntermediate(e, topY) && IsHorizontal(*e->NextInLML))
|
|
{
|
|
UpdateEdgeIntoAEL(e);
|
|
if (e->OutIdx >= 0)
|
|
AddOutPt(e, e->Bot);
|
|
AddEdgeToSEL(e);
|
|
}
|
|
else
|
|
{
|
|
e->Curr.X = TopX( *e, topY );
|
|
e->Curr.Y = topY;
|
|
}
|
|
|
|
if (m_StrictSimple)
|
|
{
|
|
TEdge* ePrev = e->PrevInAEL;
|
|
if ((e->OutIdx >= 0) && (e->WindDelta != 0) && ePrev && (ePrev->OutIdx >= 0) &&
|
|
(ePrev->Curr.X == e->Curr.X) && (ePrev->WindDelta != 0))
|
|
{
|
|
OutPt* op = AddOutPt(ePrev, e->Curr);
|
|
OutPt* op2 = AddOutPt(e, e->Curr);
|
|
AddJoin(op, op2, e->Curr); //StrictlySimple (type-3) join
|
|
}
|
|
}
|
|
|
|
e = e->NextInAEL;
|
|
}
|
|
}
|
|
|
|
//3. Process horizontals at the Top of the scanbeam ...
|
|
ProcessHorizontals(true);
|
|
|
|
//4. Promote intermediate vertices ...
|
|
e = m_ActiveEdges;
|
|
while(e)
|
|
{
|
|
if(IsIntermediate(e, topY))
|
|
{
|
|
OutPt* op = 0;
|
|
if( e->OutIdx >= 0 )
|
|
op = AddOutPt(e, e->Top);
|
|
UpdateEdgeIntoAEL(e);
|
|
|
|
//if output polygons share an edge, they'll need joining later ...
|
|
TEdge* ePrev = e->PrevInAEL;
|
|
TEdge* eNext = e->NextInAEL;
|
|
if (ePrev && ePrev->Curr.X == e->Bot.X &&
|
|
ePrev->Curr.Y == e->Bot.Y && op &&
|
|
ePrev->OutIdx >= 0 && ePrev->Curr.Y > ePrev->Top.Y &&
|
|
SlopesEqual(*e, *ePrev, m_UseFullRange) &&
|
|
(e->WindDelta != 0) && (ePrev->WindDelta != 0))
|
|
{
|
|
OutPt* op2 = AddOutPt(ePrev, e->Bot);
|
|
AddJoin(op, op2, e->Top);
|
|
}
|
|
else if (eNext && eNext->Curr.X == e->Bot.X &&
|
|
eNext->Curr.Y == e->Bot.Y && op &&
|
|
eNext->OutIdx >= 0 && eNext->Curr.Y > eNext->Top.Y &&
|
|
SlopesEqual(*e, *eNext, m_UseFullRange) &&
|
|
(e->WindDelta != 0) && (eNext->WindDelta != 0))
|
|
{
|
|
OutPt* op2 = AddOutPt(eNext, e->Bot);
|
|
AddJoin(op, op2, e->Top);
|
|
}
|
|
}
|
|
e = e->NextInAEL;
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::FixupOutPolygon(OutRec &outrec)
|
|
{
|
|
//FixupOutPolygon() - removes duplicate points and simplifies consecutive
|
|
//parallel edges by removing the middle vertex.
|
|
OutPt *lastOK = 0;
|
|
outrec.BottomPt = 0;
|
|
OutPt *pp = outrec.Pts;
|
|
|
|
for (;;)
|
|
{
|
|
if (pp->Prev == pp || pp->Prev == pp->Next )
|
|
{
|
|
DisposeOutPts(pp);
|
|
outrec.Pts = 0;
|
|
return;
|
|
}
|
|
|
|
//test for duplicate points and collinear edges ...
|
|
if ((pp->Pt == pp->Next->Pt) || (pp->Pt == pp->Prev->Pt) ||
|
|
(SlopesEqual(pp->Prev->Pt, pp->Pt, pp->Next->Pt, m_UseFullRange) &&
|
|
(!m_PreserveCollinear ||
|
|
!Pt2IsBetweenPt1AndPt3(pp->Prev->Pt, pp->Pt, pp->Next->Pt))))
|
|
{
|
|
lastOK = 0;
|
|
OutPt *tmp = pp;
|
|
pp->Prev->Next = pp->Next;
|
|
pp->Next->Prev = pp->Prev;
|
|
pp = pp->Prev;
|
|
delete tmp;
|
|
}
|
|
else if (pp == lastOK) break;
|
|
else
|
|
{
|
|
if (!lastOK) lastOK = pp;
|
|
pp = pp->Next;
|
|
}
|
|
}
|
|
outrec.Pts = pp;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
int PointCount(OutPt *Pts)
|
|
{
|
|
if (!Pts) return 0;
|
|
int result = 0;
|
|
OutPt* p = Pts;
|
|
do
|
|
{
|
|
result++;
|
|
p = p->Next;
|
|
}
|
|
while (p != Pts);
|
|
return result;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::BuildResult(Paths &polys)
|
|
{
|
|
polys.reserve(m_PolyOuts.size());
|
|
for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i)
|
|
{
|
|
if (!m_PolyOuts[i]->Pts) continue;
|
|
Path pg;
|
|
OutPt* p = m_PolyOuts[i]->Pts->Prev;
|
|
int cnt = PointCount(p);
|
|
if (cnt < 2) continue;
|
|
pg.reserve(cnt);
|
|
for (int i = 0; i < cnt; ++i)
|
|
{
|
|
pg.push_back(p->Pt);
|
|
p = p->Prev;
|
|
}
|
|
polys.push_back(pg);
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::BuildResult2(PolyTree& polytree)
|
|
{
|
|
polytree.Clear();
|
|
polytree.AllNodes.reserve(m_PolyOuts.size());
|
|
//add each output polygon/contour to polytree ...
|
|
for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); i++)
|
|
{
|
|
OutRec* outRec = m_PolyOuts[i];
|
|
int cnt = PointCount(outRec->Pts);
|
|
if ((outRec->IsOpen && cnt < 2) || (!outRec->IsOpen && cnt < 3)) continue;
|
|
FixHoleLinkage(*outRec);
|
|
PolyNode* pn = new PolyNode();
|
|
//nb: polytree takes ownership of all the PolyNodes
|
|
polytree.AllNodes.push_back(pn);
|
|
outRec->PolyNd = pn;
|
|
pn->Parent = 0;
|
|
pn->Index = 0;
|
|
pn->Contour.reserve(cnt);
|
|
OutPt *op = outRec->Pts->Prev;
|
|
for (int j = 0; j < cnt; j++)
|
|
{
|
|
pn->Contour.push_back(op->Pt);
|
|
op = op->Prev;
|
|
}
|
|
}
|
|
|
|
//fixup PolyNode links etc ...
|
|
polytree.Childs.reserve(m_PolyOuts.size());
|
|
for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); i++)
|
|
{
|
|
OutRec* outRec = m_PolyOuts[i];
|
|
if (!outRec->PolyNd) continue;
|
|
if (outRec->IsOpen)
|
|
{
|
|
outRec->PolyNd->m_IsOpen = true;
|
|
polytree.AddChild(*outRec->PolyNd);
|
|
}
|
|
else if (outRec->FirstLeft && outRec->FirstLeft->PolyNd)
|
|
outRec->FirstLeft->PolyNd->AddChild(*outRec->PolyNd);
|
|
else
|
|
polytree.AddChild(*outRec->PolyNd);
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void SwapIntersectNodes(IntersectNode &int1, IntersectNode &int2)
|
|
{
|
|
//just swap the contents (because fIntersectNodes is a single-linked-list)
|
|
IntersectNode inode = int1; //gets a copy of Int1
|
|
int1.Edge1 = int2.Edge1;
|
|
int1.Edge2 = int2.Edge2;
|
|
int1.Pt = int2.Pt;
|
|
int2.Edge1 = inode.Edge1;
|
|
int2.Edge2 = inode.Edge2;
|
|
int2.Pt = inode.Pt;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
inline bool E2InsertsBeforeE1(TEdge &e1, TEdge &e2)
|
|
{
|
|
if (e2.Curr.X == e1.Curr.X)
|
|
{
|
|
if (e2.Top.Y > e1.Top.Y)
|
|
return e2.Top.X < TopX(e1, e2.Top.Y);
|
|
else return e1.Top.X > TopX(e2, e1.Top.Y);
|
|
}
|
|
else return e2.Curr.X < e1.Curr.X;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool GetOverlap(const cInt a1, const cInt a2, const cInt b1, const cInt b2,
|
|
cInt& Left, cInt& Right)
|
|
{
|
|
if (a1 < a2)
|
|
{
|
|
if (b1 < b2) {Left = std::max(a1,b1); Right = std::min(a2,b2);}
|
|
else {Left = std::max(a1,b2); Right = std::min(a2,b1);}
|
|
}
|
|
else
|
|
{
|
|
if (b1 < b2) {Left = std::max(a2,b1); Right = std::min(a1,b2);}
|
|
else {Left = std::max(a2,b2); Right = std::min(a1,b1);}
|
|
}
|
|
return Left < Right;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
inline void UpdateOutPtIdxs(OutRec& outrec)
|
|
{
|
|
OutPt* op = outrec.Pts;
|
|
do
|
|
{
|
|
op->Idx = outrec.Idx;
|
|
op = op->Prev;
|
|
}
|
|
while(op != outrec.Pts);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::InsertEdgeIntoAEL(TEdge *edge, TEdge* startEdge)
|
|
{
|
|
if(!m_ActiveEdges)
|
|
{
|
|
edge->PrevInAEL = 0;
|
|
edge->NextInAEL = 0;
|
|
m_ActiveEdges = edge;
|
|
}
|
|
else if(!startEdge && E2InsertsBeforeE1(*m_ActiveEdges, *edge))
|
|
{
|
|
edge->PrevInAEL = 0;
|
|
edge->NextInAEL = m_ActiveEdges;
|
|
m_ActiveEdges->PrevInAEL = edge;
|
|
m_ActiveEdges = edge;
|
|
}
|
|
else
|
|
{
|
|
if(!startEdge) startEdge = m_ActiveEdges;
|
|
while(startEdge->NextInAEL &&
|
|
!E2InsertsBeforeE1(*startEdge->NextInAEL , *edge))
|
|
startEdge = startEdge->NextInAEL;
|
|
edge->NextInAEL = startEdge->NextInAEL;
|
|
if(startEdge->NextInAEL) startEdge->NextInAEL->PrevInAEL = edge;
|
|
edge->PrevInAEL = startEdge;
|
|
startEdge->NextInAEL = edge;
|
|
}
|
|
}
|
|
//----------------------------------------------------------------------
|
|
|
|
OutPt* DupOutPt(OutPt* outPt, bool InsertAfter)
|
|
{
|
|
OutPt* result = new OutPt;
|
|
result->Pt = outPt->Pt;
|
|
result->Idx = outPt->Idx;
|
|
if (InsertAfter)
|
|
{
|
|
result->Next = outPt->Next;
|
|
result->Prev = outPt;
|
|
outPt->Next->Prev = result;
|
|
outPt->Next = result;
|
|
}
|
|
else
|
|
{
|
|
result->Prev = outPt->Prev;
|
|
result->Next = outPt;
|
|
outPt->Prev->Next = result;
|
|
outPt->Prev = result;
|
|
}
|
|
return result;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool JoinHorz(OutPt* op1, OutPt* op1b, OutPt* op2, OutPt* op2b,
|
|
const IntPoint Pt, bool DiscardLeft)
|
|
{
|
|
Direction Dir1 = (op1->Pt.X > op1b->Pt.X ? dRightToLeft : dLeftToRight);
|
|
Direction Dir2 = (op2->Pt.X > op2b->Pt.X ? dRightToLeft : dLeftToRight);
|
|
if (Dir1 == Dir2) return false;
|
|
|
|
//When DiscardLeft, we want Op1b to be on the Left of Op1, otherwise we
|
|
//want Op1b to be on the Right. (And likewise with Op2 and Op2b.)
|
|
//So, to facilitate this while inserting Op1b and Op2b ...
|
|
//when DiscardLeft, make sure we're AT or RIGHT of Pt before adding Op1b,
|
|
//otherwise make sure we're AT or LEFT of Pt. (Likewise with Op2b.)
|
|
if (Dir1 == dLeftToRight)
|
|
{
|
|
while (op1->Next->Pt.X <= Pt.X &&
|
|
op1->Next->Pt.X >= op1->Pt.X && op1->Next->Pt.Y == Pt.Y)
|
|
op1 = op1->Next;
|
|
if (DiscardLeft && (op1->Pt.X != Pt.X)) op1 = op1->Next;
|
|
op1b = DupOutPt(op1, !DiscardLeft);
|
|
if (op1b->Pt != Pt)
|
|
{
|
|
op1 = op1b;
|
|
op1->Pt = Pt;
|
|
op1b = DupOutPt(op1, !DiscardLeft);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
while (op1->Next->Pt.X >= Pt.X &&
|
|
op1->Next->Pt.X <= op1->Pt.X && op1->Next->Pt.Y == Pt.Y)
|
|
op1 = op1->Next;
|
|
if (!DiscardLeft && (op1->Pt.X != Pt.X)) op1 = op1->Next;
|
|
op1b = DupOutPt(op1, DiscardLeft);
|
|
if (op1b->Pt != Pt)
|
|
{
|
|
op1 = op1b;
|
|
op1->Pt = Pt;
|
|
op1b = DupOutPt(op1, DiscardLeft);
|
|
}
|
|
}
|
|
|
|
if (Dir2 == dLeftToRight)
|
|
{
|
|
while (op2->Next->Pt.X <= Pt.X &&
|
|
op2->Next->Pt.X >= op2->Pt.X && op2->Next->Pt.Y == Pt.Y)
|
|
op2 = op2->Next;
|
|
if (DiscardLeft && (op2->Pt.X != Pt.X)) op2 = op2->Next;
|
|
op2b = DupOutPt(op2, !DiscardLeft);
|
|
if (op2b->Pt != Pt)
|
|
{
|
|
op2 = op2b;
|
|
op2->Pt = Pt;
|
|
op2b = DupOutPt(op2, !DiscardLeft);
|
|
};
|
|
} else
|
|
{
|
|
while (op2->Next->Pt.X >= Pt.X &&
|
|
op2->Next->Pt.X <= op2->Pt.X && op2->Next->Pt.Y == Pt.Y)
|
|
op2 = op2->Next;
|
|
if (!DiscardLeft && (op2->Pt.X != Pt.X)) op2 = op2->Next;
|
|
op2b = DupOutPt(op2, DiscardLeft);
|
|
if (op2b->Pt != Pt)
|
|
{
|
|
op2 = op2b;
|
|
op2->Pt = Pt;
|
|
op2b = DupOutPt(op2, DiscardLeft);
|
|
};
|
|
};
|
|
|
|
if ((Dir1 == dLeftToRight) == DiscardLeft)
|
|
{
|
|
op1->Prev = op2;
|
|
op2->Next = op1;
|
|
op1b->Next = op2b;
|
|
op2b->Prev = op1b;
|
|
}
|
|
else
|
|
{
|
|
op1->Next = op2;
|
|
op2->Prev = op1;
|
|
op1b->Prev = op2b;
|
|
op2b->Next = op1b;
|
|
}
|
|
return true;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool Clipper::JoinPoints(Join *j, OutRec* outRec1, OutRec* outRec2)
|
|
{
|
|
OutPt *op1 = j->OutPt1, *op1b;
|
|
OutPt *op2 = j->OutPt2, *op2b;
|
|
|
|
//There are 3 kinds of joins for output polygons ...
|
|
//1. Horizontal joins where Join.OutPt1 & Join.OutPt2 are a vertices anywhere
|
|
//along (horizontal) collinear edges (& Join.OffPt is on the same horizontal).
|
|
//2. Non-horizontal joins where Join.OutPt1 & Join.OutPt2 are at the same
|
|
//location at the Bottom of the overlapping segment (& Join.OffPt is above).
|
|
//3. StrictSimple joins where edges touch but are not collinear and where
|
|
//Join.OutPt1, Join.OutPt2 & Join.OffPt all share the same point.
|
|
bool isHorizontal = (j->OutPt1->Pt.Y == j->OffPt.Y);
|
|
|
|
if (isHorizontal && (j->OffPt == j->OutPt1->Pt) &&
|
|
(j->OffPt == j->OutPt2->Pt))
|
|
{
|
|
//Strictly Simple join ...
|
|
op1b = j->OutPt1->Next;
|
|
while (op1b != op1 && (op1b->Pt == j->OffPt))
|
|
op1b = op1b->Next;
|
|
bool reverse1 = (op1b->Pt.Y > j->OffPt.Y);
|
|
op2b = j->OutPt2->Next;
|
|
while (op2b != op2 && (op2b->Pt == j->OffPt))
|
|
op2b = op2b->Next;
|
|
bool reverse2 = (op2b->Pt.Y > j->OffPt.Y);
|
|
if (reverse1 == reverse2) return false;
|
|
if (reverse1)
|
|
{
|
|
op1b = DupOutPt(op1, false);
|
|
op2b = DupOutPt(op2, true);
|
|
op1->Prev = op2;
|
|
op2->Next = op1;
|
|
op1b->Next = op2b;
|
|
op2b->Prev = op1b;
|
|
j->OutPt1 = op1;
|
|
j->OutPt2 = op1b;
|
|
return true;
|
|
} else
|
|
{
|
|
op1b = DupOutPt(op1, true);
|
|
op2b = DupOutPt(op2, false);
|
|
op1->Next = op2;
|
|
op2->Prev = op1;
|
|
op1b->Prev = op2b;
|
|
op2b->Next = op1b;
|
|
j->OutPt1 = op1;
|
|
j->OutPt2 = op1b;
|
|
return true;
|
|
}
|
|
}
|
|
else if (isHorizontal)
|
|
{
|
|
//treat horizontal joins differently to non-horizontal joins since with
|
|
//them we're not yet sure where the overlapping is. OutPt1.Pt & OutPt2.Pt
|
|
//may be anywhere along the horizontal edge.
|
|
op1b = op1;
|
|
while (op1->Prev->Pt.Y == op1->Pt.Y && op1->Prev != op1b && op1->Prev != op2)
|
|
op1 = op1->Prev;
|
|
while (op1b->Next->Pt.Y == op1b->Pt.Y && op1b->Next != op1 && op1b->Next != op2)
|
|
op1b = op1b->Next;
|
|
if (op1b->Next == op1 || op1b->Next == op2) return false; //a flat 'polygon'
|
|
|
|
op2b = op2;
|
|
while (op2->Prev->Pt.Y == op2->Pt.Y && op2->Prev != op2b && op2->Prev != op1b)
|
|
op2 = op2->Prev;
|
|
while (op2b->Next->Pt.Y == op2b->Pt.Y && op2b->Next != op2 && op2b->Next != op1)
|
|
op2b = op2b->Next;
|
|
if (op2b->Next == op2 || op2b->Next == op1) return false; //a flat 'polygon'
|
|
|
|
cInt Left, Right;
|
|
//Op1 --> Op1b & Op2 --> Op2b are the extremites of the horizontal edges
|
|
if (!GetOverlap(op1->Pt.X, op1b->Pt.X, op2->Pt.X, op2b->Pt.X, Left, Right))
|
|
return false;
|
|
|
|
//DiscardLeftSide: when overlapping edges are joined, a spike will created
|
|
//which needs to be cleaned up. However, we don't want Op1 or Op2 caught up
|
|
//on the discard Side as either may still be needed for other joins ...
|
|
IntPoint Pt;
|
|
bool DiscardLeftSide;
|
|
if (op1->Pt.X >= Left && op1->Pt.X <= Right)
|
|
{
|
|
Pt = op1->Pt; DiscardLeftSide = (op1->Pt.X > op1b->Pt.X);
|
|
}
|
|
else if (op2->Pt.X >= Left&& op2->Pt.X <= Right)
|
|
{
|
|
Pt = op2->Pt; DiscardLeftSide = (op2->Pt.X > op2b->Pt.X);
|
|
}
|
|
else if (op1b->Pt.X >= Left && op1b->Pt.X <= Right)
|
|
{
|
|
Pt = op1b->Pt; DiscardLeftSide = op1b->Pt.X > op1->Pt.X;
|
|
}
|
|
else
|
|
{
|
|
Pt = op2b->Pt; DiscardLeftSide = (op2b->Pt.X > op2->Pt.X);
|
|
}
|
|
j->OutPt1 = op1; j->OutPt2 = op2;
|
|
return JoinHorz(op1, op1b, op2, op2b, Pt, DiscardLeftSide);
|
|
} else
|
|
{
|
|
//nb: For non-horizontal joins ...
|
|
// 1. Jr.OutPt1.Pt.Y == Jr.OutPt2.Pt.Y
|
|
// 2. Jr.OutPt1.Pt > Jr.OffPt.Y
|
|
|
|
//make sure the polygons are correctly oriented ...
|
|
op1b = op1->Next;
|
|
while ((op1b->Pt == op1->Pt) && (op1b != op1)) op1b = op1b->Next;
|
|
bool Reverse1 = ((op1b->Pt.Y > op1->Pt.Y) ||
|
|
!SlopesEqual(op1->Pt, op1b->Pt, j->OffPt, m_UseFullRange));
|
|
if (Reverse1)
|
|
{
|
|
op1b = op1->Prev;
|
|
while ((op1b->Pt == op1->Pt) && (op1b != op1)) op1b = op1b->Prev;
|
|
if ((op1b->Pt.Y > op1->Pt.Y) ||
|
|
!SlopesEqual(op1->Pt, op1b->Pt, j->OffPt, m_UseFullRange)) return false;
|
|
};
|
|
op2b = op2->Next;
|
|
while ((op2b->Pt == op2->Pt) && (op2b != op2))op2b = op2b->Next;
|
|
bool Reverse2 = ((op2b->Pt.Y > op2->Pt.Y) ||
|
|
!SlopesEqual(op2->Pt, op2b->Pt, j->OffPt, m_UseFullRange));
|
|
if (Reverse2)
|
|
{
|
|
op2b = op2->Prev;
|
|
while ((op2b->Pt == op2->Pt) && (op2b != op2)) op2b = op2b->Prev;
|
|
if ((op2b->Pt.Y > op2->Pt.Y) ||
|
|
!SlopesEqual(op2->Pt, op2b->Pt, j->OffPt, m_UseFullRange)) return false;
|
|
}
|
|
|
|
if ((op1b == op1) || (op2b == op2) || (op1b == op2b) ||
|
|
((outRec1 == outRec2) && (Reverse1 == Reverse2))) return false;
|
|
|
|
if (Reverse1)
|
|
{
|
|
op1b = DupOutPt(op1, false);
|
|
op2b = DupOutPt(op2, true);
|
|
op1->Prev = op2;
|
|
op2->Next = op1;
|
|
op1b->Next = op2b;
|
|
op2b->Prev = op1b;
|
|
j->OutPt1 = op1;
|
|
j->OutPt2 = op1b;
|
|
return true;
|
|
} else
|
|
{
|
|
op1b = DupOutPt(op1, true);
|
|
op2b = DupOutPt(op2, false);
|
|
op1->Next = op2;
|
|
op2->Prev = op1;
|
|
op1b->Prev = op2b;
|
|
op2b->Next = op1b;
|
|
j->OutPt1 = op1;
|
|
j->OutPt2 = op1b;
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
//----------------------------------------------------------------------
|
|
|
|
void Clipper::FixupFirstLefts1(OutRec* OldOutRec, OutRec* NewOutRec)
|
|
{
|
|
|
|
for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i)
|
|
{
|
|
OutRec* outRec = m_PolyOuts[i];
|
|
if (outRec->Pts && outRec->FirstLeft == OldOutRec)
|
|
{
|
|
if (Poly2ContainsPoly1(outRec->Pts, NewOutRec->Pts))
|
|
outRec->FirstLeft = NewOutRec;
|
|
}
|
|
}
|
|
}
|
|
//----------------------------------------------------------------------
|
|
|
|
void Clipper::FixupFirstLefts2(OutRec* OldOutRec, OutRec* NewOutRec)
|
|
{
|
|
for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i)
|
|
{
|
|
OutRec* outRec = m_PolyOuts[i];
|
|
if (outRec->FirstLeft == OldOutRec) outRec->FirstLeft = NewOutRec;
|
|
}
|
|
}
|
|
//----------------------------------------------------------------------
|
|
|
|
static OutRec* ParseFirstLeft(OutRec* FirstLeft)
|
|
{
|
|
while (FirstLeft && !FirstLeft->Pts)
|
|
FirstLeft = FirstLeft->FirstLeft;
|
|
return FirstLeft;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::JoinCommonEdges()
|
|
{
|
|
for (JoinList::size_type i = 0; i < m_Joins.size(); i++)
|
|
{
|
|
Join* join = m_Joins[i];
|
|
|
|
OutRec *outRec1 = GetOutRec(join->OutPt1->Idx);
|
|
OutRec *outRec2 = GetOutRec(join->OutPt2->Idx);
|
|
|
|
if (!outRec1->Pts || !outRec2->Pts) continue;
|
|
|
|
//get the polygon fragment with the correct hole state (FirstLeft)
|
|
//before calling JoinPoints() ...
|
|
OutRec *holeStateRec;
|
|
if (outRec1 == outRec2) holeStateRec = outRec1;
|
|
else if (Param1RightOfParam2(outRec1, outRec2)) holeStateRec = outRec2;
|
|
else if (Param1RightOfParam2(outRec2, outRec1)) holeStateRec = outRec1;
|
|
else holeStateRec = GetLowermostRec(outRec1, outRec2);
|
|
|
|
if (!JoinPoints(join, outRec1, outRec2)) continue;
|
|
|
|
if (outRec1 == outRec2)
|
|
{
|
|
//instead of joining two polygons, we've just created a new one by
|
|
//splitting one polygon into two.
|
|
outRec1->Pts = join->OutPt1;
|
|
outRec1->BottomPt = 0;
|
|
outRec2 = CreateOutRec();
|
|
outRec2->Pts = join->OutPt2;
|
|
|
|
//update all OutRec2.Pts Idx's ...
|
|
UpdateOutPtIdxs(*outRec2);
|
|
|
|
//We now need to check every OutRec.FirstLeft pointer. If it points
|
|
//to OutRec1 it may need to point to OutRec2 instead ...
|
|
if (m_UsingPolyTree)
|
|
for (PolyOutList::size_type j = 0; j < m_PolyOuts.size() - 1; j++)
|
|
{
|
|
OutRec* oRec = m_PolyOuts[j];
|
|
if (!oRec->Pts || ParseFirstLeft(oRec->FirstLeft) != outRec1 ||
|
|
oRec->IsHole == outRec1->IsHole) continue;
|
|
if (Poly2ContainsPoly1(oRec->Pts, join->OutPt2))
|
|
oRec->FirstLeft = outRec2;
|
|
}
|
|
|
|
if (Poly2ContainsPoly1(outRec2->Pts, outRec1->Pts))
|
|
{
|
|
//outRec2 is contained by outRec1 ...
|
|
outRec2->IsHole = !outRec1->IsHole;
|
|
outRec2->FirstLeft = outRec1;
|
|
|
|
//fixup FirstLeft pointers that may need reassigning to OutRec1
|
|
if (m_UsingPolyTree) FixupFirstLefts2(outRec2, outRec1);
|
|
|
|
if ((outRec2->IsHole ^ m_ReverseOutput) == (Area(*outRec2) > 0))
|
|
ReversePolyPtLinks(outRec2->Pts);
|
|
|
|
} else if (Poly2ContainsPoly1(outRec1->Pts, outRec2->Pts))
|
|
{
|
|
//outRec1 is contained by outRec2 ...
|
|
outRec2->IsHole = outRec1->IsHole;
|
|
outRec1->IsHole = !outRec2->IsHole;
|
|
outRec2->FirstLeft = outRec1->FirstLeft;
|
|
outRec1->FirstLeft = outRec2;
|
|
|
|
//fixup FirstLeft pointers that may need reassigning to OutRec1
|
|
if (m_UsingPolyTree) FixupFirstLefts2(outRec1, outRec2);
|
|
|
|
if ((outRec1->IsHole ^ m_ReverseOutput) == (Area(*outRec1) > 0))
|
|
ReversePolyPtLinks(outRec1->Pts);
|
|
}
|
|
else
|
|
{
|
|
//the 2 polygons are completely separate ...
|
|
outRec2->IsHole = outRec1->IsHole;
|
|
outRec2->FirstLeft = outRec1->FirstLeft;
|
|
|
|
//fixup FirstLeft pointers that may need reassigning to OutRec2
|
|
if (m_UsingPolyTree) FixupFirstLefts1(outRec1, outRec2);
|
|
}
|
|
|
|
} else
|
|
{
|
|
//joined 2 polygons together ...
|
|
|
|
outRec2->Pts = 0;
|
|
outRec2->BottomPt = 0;
|
|
outRec2->Idx = outRec1->Idx;
|
|
|
|
outRec1->IsHole = holeStateRec->IsHole;
|
|
if (holeStateRec == outRec2)
|
|
outRec1->FirstLeft = outRec2->FirstLeft;
|
|
outRec2->FirstLeft = outRec1;
|
|
|
|
//fixup FirstLeft pointers that may need reassigning to OutRec1
|
|
if (m_UsingPolyTree) FixupFirstLefts2(outRec2, outRec1);
|
|
}
|
|
}
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// ClipperOffset support functions ...
|
|
//------------------------------------------------------------------------------
|
|
|
|
DoublePoint GetUnitNormal(const IntPoint &pt1, const IntPoint &pt2)
|
|
{
|
|
if(pt2.X == pt1.X && pt2.Y == pt1.Y)
|
|
return DoublePoint(0, 0);
|
|
|
|
double Dx = (double)(pt2.X - pt1.X);
|
|
double dy = (double)(pt2.Y - pt1.Y);
|
|
double f = 1 *1.0/ std::sqrt( Dx*Dx + dy*dy );
|
|
Dx *= f;
|
|
dy *= f;
|
|
return DoublePoint(dy, -Dx);
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// ClipperOffset class
|
|
//------------------------------------------------------------------------------
|
|
|
|
ClipperOffset::ClipperOffset(double miterLimit, double arcTolerance)
|
|
{
|
|
this->MiterLimit = miterLimit;
|
|
this->ArcTolerance = arcTolerance;
|
|
m_lowest.X = -1;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
ClipperOffset::~ClipperOffset()
|
|
{
|
|
Clear();
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void ClipperOffset::Clear()
|
|
{
|
|
for (int i = 0; i < m_polyNodes.ChildCount(); ++i)
|
|
delete m_polyNodes.Childs[i];
|
|
m_polyNodes.Childs.clear();
|
|
m_lowest.X = -1;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void ClipperOffset::AddPath(const Path& path, JoinType joinType, EndType endType)
|
|
{
|
|
int highI = (int)path.size() - 1;
|
|
if (highI < 0) return;
|
|
PolyNode* newNode = new PolyNode();
|
|
newNode->m_jointype = joinType;
|
|
newNode->m_endtype = endType;
|
|
|
|
//strip duplicate points from path and also get index to the lowest point ...
|
|
if (endType == etClosedLine || endType == etClosedPolygon)
|
|
while (highI > 0 && path[0] == path[highI]) highI--;
|
|
newNode->Contour.reserve(highI + 1);
|
|
newNode->Contour.push_back(path[0]);
|
|
int j = 0, k = 0;
|
|
for (int i = 1; i <= highI; i++)
|
|
if (newNode->Contour[j] != path[i])
|
|
{
|
|
j++;
|
|
newNode->Contour.push_back(path[i]);
|
|
if (path[i].Y > newNode->Contour[k].Y ||
|
|
(path[i].Y == newNode->Contour[k].Y &&
|
|
path[i].X < newNode->Contour[k].X)) k = j;
|
|
}
|
|
if ((endType == etClosedPolygon && j < 2) ||
|
|
(endType != etClosedPolygon && j < 0))
|
|
{
|
|
delete newNode;
|
|
return;
|
|
}
|
|
m_polyNodes.AddChild(*newNode);
|
|
|
|
//if this path's lowest pt is lower than all the others then update m_lowest
|
|
if (endType != etClosedPolygon) return;
|
|
if (m_lowest.X < 0)
|
|
m_lowest = IntPoint(0, k);
|
|
else
|
|
{
|
|
IntPoint ip = m_polyNodes.Childs[(int)m_lowest.X]->Contour[(int)m_lowest.Y];
|
|
if (newNode->Contour[k].Y > ip.Y ||
|
|
(newNode->Contour[k].Y == ip.Y &&
|
|
newNode->Contour[k].X < ip.X))
|
|
m_lowest = IntPoint(m_polyNodes.ChildCount() - 1, k);
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void ClipperOffset::AddPaths(const Paths& paths, JoinType joinType, EndType endType)
|
|
{
|
|
for (Paths::size_type i = 0; i < paths.size(); ++i)
|
|
AddPath(paths[i], joinType, endType);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void ClipperOffset::FixOrientations()
|
|
{
|
|
//fixup orientations of all closed paths if the orientation of the
|
|
//closed path with the lowermost vertex is wrong ...
|
|
if (m_lowest.X >= 0 &&
|
|
!Orientation(m_polyNodes.Childs[(int)m_lowest.X]->Contour))
|
|
{
|
|
for (int i = 0; i < m_polyNodes.ChildCount(); ++i)
|
|
{
|
|
PolyNode& node = *m_polyNodes.Childs[i];
|
|
if (node.m_endtype == etClosedPolygon ||
|
|
(node.m_endtype == etClosedLine && Orientation(node.Contour)))
|
|
ReversePath(node.Contour);
|
|
}
|
|
} else
|
|
{
|
|
for (int i = 0; i < m_polyNodes.ChildCount(); ++i)
|
|
{
|
|
PolyNode& node = *m_polyNodes.Childs[i];
|
|
if (node.m_endtype == etClosedLine && !Orientation(node.Contour))
|
|
ReversePath(node.Contour);
|
|
}
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void ClipperOffset::Execute(Paths& solution, double delta)
|
|
{
|
|
solution.clear();
|
|
FixOrientations();
|
|
DoOffset(delta);
|
|
|
|
//now clean up 'corners' ...
|
|
Clipper clpr;
|
|
clpr.AddPaths(m_destPolys, ptSubject, true);
|
|
if (delta > 0)
|
|
{
|
|
clpr.Execute(ctUnion, solution, pftPositive, pftPositive);
|
|
}
|
|
else
|
|
{
|
|
IntRect r = clpr.GetBounds();
|
|
Path outer(4);
|
|
outer[0] = IntPoint(r.left - 10, r.bottom + 10);
|
|
outer[1] = IntPoint(r.right + 10, r.bottom + 10);
|
|
outer[2] = IntPoint(r.right + 10, r.top - 10);
|
|
outer[3] = IntPoint(r.left - 10, r.top - 10);
|
|
|
|
clpr.AddPath(outer, ptSubject, true);
|
|
clpr.ReverseSolution(true);
|
|
clpr.Execute(ctUnion, solution, pftNegative, pftNegative);
|
|
if (solution.size() > 0) solution.erase(solution.begin());
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void ClipperOffset::Execute(PolyTree& solution, double delta)
|
|
{
|
|
solution.Clear();
|
|
FixOrientations();
|
|
DoOffset(delta);
|
|
|
|
//now clean up 'corners' ...
|
|
Clipper clpr;
|
|
clpr.AddPaths(m_destPolys, ptSubject, true);
|
|
if (delta > 0)
|
|
{
|
|
clpr.Execute(ctUnion, solution, pftPositive, pftPositive);
|
|
}
|
|
else
|
|
{
|
|
IntRect r = clpr.GetBounds();
|
|
Path outer(4);
|
|
outer[0] = IntPoint(r.left - 10, r.bottom + 10);
|
|
outer[1] = IntPoint(r.right + 10, r.bottom + 10);
|
|
outer[2] = IntPoint(r.right + 10, r.top - 10);
|
|
outer[3] = IntPoint(r.left - 10, r.top - 10);
|
|
|
|
clpr.AddPath(outer, ptSubject, true);
|
|
clpr.ReverseSolution(true);
|
|
clpr.Execute(ctUnion, solution, pftNegative, pftNegative);
|
|
//remove the outer PolyNode rectangle ...
|
|
if (solution.ChildCount() == 1 && solution.Childs[0]->ChildCount() > 0)
|
|
{
|
|
PolyNode* outerNode = solution.Childs[0];
|
|
solution.Childs.reserve(outerNode->ChildCount());
|
|
solution.Childs[0] = outerNode->Childs[0];
|
|
for (int i = 1; i < outerNode->ChildCount(); ++i)
|
|
solution.AddChild(*outerNode->Childs[i]);
|
|
}
|
|
else
|
|
solution.Clear();
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void ClipperOffset::DoOffset(double delta)
|
|
{
|
|
m_destPolys.clear();
|
|
m_delta = delta;
|
|
|
|
//if Zero offset, just copy any CLOSED polygons to m_p and return ...
|
|
if (NEAR_ZERO(delta))
|
|
{
|
|
m_destPolys.reserve(m_polyNodes.ChildCount());
|
|
for (int i = 0; i < m_polyNodes.ChildCount(); i++)
|
|
{
|
|
PolyNode& node = *m_polyNodes.Childs[i];
|
|
if (node.m_endtype == etClosedPolygon)
|
|
m_destPolys.push_back(node.Contour);
|
|
}
|
|
return;
|
|
}
|
|
|
|
//see offset_triginometry3.svg in the documentation folder ...
|
|
if (MiterLimit > 2) m_miterLim = 2/(MiterLimit * MiterLimit);
|
|
else m_miterLim = 0.5;
|
|
|
|
double y;
|
|
if (ArcTolerance <= 0.0) y = def_arc_tolerance;
|
|
else if (ArcTolerance > std::fabs(delta) * def_arc_tolerance)
|
|
y = std::fabs(delta) * def_arc_tolerance;
|
|
else y = ArcTolerance;
|
|
//see offset_triginometry2.svg in the documentation folder ...
|
|
double steps = pi / std::acos(1 - y / std::fabs(delta));
|
|
if (steps > std::fabs(delta) * pi)
|
|
steps = std::fabs(delta) * pi; //ie excessive precision check
|
|
m_sin = std::sin(two_pi / steps);
|
|
m_cos = std::cos(two_pi / steps);
|
|
m_StepsPerRad = steps / two_pi;
|
|
if (delta < 0.0) m_sin = -m_sin;
|
|
|
|
m_destPolys.reserve(m_polyNodes.ChildCount() * 2);
|
|
for (int i = 0; i < m_polyNodes.ChildCount(); i++)
|
|
{
|
|
PolyNode& node = *m_polyNodes.Childs[i];
|
|
m_srcPoly = node.Contour;
|
|
|
|
int len = (int)m_srcPoly.size();
|
|
if (len == 0 || (delta <= 0 && (len < 3 || node.m_endtype != etClosedPolygon)))
|
|
continue;
|
|
|
|
m_destPoly.clear();
|
|
if (len == 1)
|
|
{
|
|
if (node.m_jointype == jtRound)
|
|
{
|
|
double X = 1.0, Y = 0.0;
|
|
for (cInt j = 1; j <= steps; j++)
|
|
{
|
|
m_destPoly.push_back(IntPoint(
|
|
Round(m_srcPoly[0].X + X * delta),
|
|
Round(m_srcPoly[0].Y + Y * delta)));
|
|
double X2 = X;
|
|
X = X * m_cos - m_sin * Y;
|
|
Y = X2 * m_sin + Y * m_cos;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
double X = -1.0, Y = -1.0;
|
|
for (int j = 0; j < 4; ++j)
|
|
{
|
|
m_destPoly.push_back(IntPoint(
|
|
Round(m_srcPoly[0].X + X * delta),
|
|
Round(m_srcPoly[0].Y + Y * delta)));
|
|
if (X < 0) X = 1;
|
|
else if (Y < 0) Y = 1;
|
|
else X = -1;
|
|
}
|
|
}
|
|
m_destPolys.push_back(m_destPoly);
|
|
continue;
|
|
}
|
|
//build m_normals ...
|
|
m_normals.clear();
|
|
m_normals.reserve(len);
|
|
for (int j = 0; j < len - 1; ++j)
|
|
m_normals.push_back(GetUnitNormal(m_srcPoly[j], m_srcPoly[j + 1]));
|
|
if (node.m_endtype == etClosedLine || node.m_endtype == etClosedPolygon)
|
|
m_normals.push_back(GetUnitNormal(m_srcPoly[len - 1], m_srcPoly[0]));
|
|
else
|
|
m_normals.push_back(DoublePoint(m_normals[len - 2]));
|
|
|
|
if (node.m_endtype == etClosedPolygon)
|
|
{
|
|
int k = len - 1;
|
|
for (int j = 0; j < len; ++j)
|
|
OffsetPoint(j, k, node.m_jointype);
|
|
m_destPolys.push_back(m_destPoly);
|
|
}
|
|
else if (node.m_endtype == etClosedLine)
|
|
{
|
|
int k = len - 1;
|
|
for (int j = 0; j < len; ++j)
|
|
OffsetPoint(j, k, node.m_jointype);
|
|
m_destPolys.push_back(m_destPoly);
|
|
m_destPoly.clear();
|
|
//re-build m_normals ...
|
|
DoublePoint n = m_normals[len -1];
|
|
for (int j = len - 1; j > 0; j--)
|
|
m_normals[j] = DoublePoint(-m_normals[j - 1].X, -m_normals[j - 1].Y);
|
|
m_normals[0] = DoublePoint(-n.X, -n.Y);
|
|
k = 0;
|
|
for (int j = len - 1; j >= 0; j--)
|
|
OffsetPoint(j, k, node.m_jointype);
|
|
m_destPolys.push_back(m_destPoly);
|
|
}
|
|
else
|
|
{
|
|
int k = 0;
|
|
for (int j = 1; j < len - 1; ++j)
|
|
OffsetPoint(j, k, node.m_jointype);
|
|
|
|
IntPoint pt1;
|
|
if (node.m_endtype == etOpenButt)
|
|
{
|
|
int j = len - 1;
|
|
pt1 = IntPoint((cInt)Round(m_srcPoly[j].X + m_normals[j].X *
|
|
delta), (cInt)Round(m_srcPoly[j].Y + m_normals[j].Y * delta));
|
|
m_destPoly.push_back(pt1);
|
|
pt1 = IntPoint((cInt)Round(m_srcPoly[j].X - m_normals[j].X *
|
|
delta), (cInt)Round(m_srcPoly[j].Y - m_normals[j].Y * delta));
|
|
m_destPoly.push_back(pt1);
|
|
}
|
|
else
|
|
{
|
|
int j = len - 1;
|
|
k = len - 2;
|
|
m_sinA = 0;
|
|
m_normals[j] = DoublePoint(-m_normals[j].X, -m_normals[j].Y);
|
|
if (node.m_endtype == etOpenSquare)
|
|
DoSquare(j, k);
|
|
else
|
|
DoRound(j, k);
|
|
}
|
|
|
|
//re-build m_normals ...
|
|
for (int j = len - 1; j > 0; j--)
|
|
m_normals[j] = DoublePoint(-m_normals[j - 1].X, -m_normals[j - 1].Y);
|
|
m_normals[0] = DoublePoint(-m_normals[1].X, -m_normals[1].Y);
|
|
|
|
k = len - 1;
|
|
for (int j = k - 1; j > 0; --j) OffsetPoint(j, k, node.m_jointype);
|
|
|
|
if (node.m_endtype == etOpenButt)
|
|
{
|
|
pt1 = IntPoint((cInt)Round(m_srcPoly[0].X - m_normals[0].X * delta),
|
|
(cInt)Round(m_srcPoly[0].Y - m_normals[0].Y * delta));
|
|
m_destPoly.push_back(pt1);
|
|
pt1 = IntPoint((cInt)Round(m_srcPoly[0].X + m_normals[0].X * delta),
|
|
(cInt)Round(m_srcPoly[0].Y + m_normals[0].Y * delta));
|
|
m_destPoly.push_back(pt1);
|
|
}
|
|
else
|
|
{
|
|
k = 1;
|
|
m_sinA = 0;
|
|
if (node.m_endtype == etOpenSquare)
|
|
DoSquare(0, 1);
|
|
else
|
|
DoRound(0, 1);
|
|
}
|
|
m_destPolys.push_back(m_destPoly);
|
|
}
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void ClipperOffset::OffsetPoint(int j, int& k, JoinType jointype)
|
|
{
|
|
m_sinA = (m_normals[k].X * m_normals[j].Y - m_normals[j].X * m_normals[k].Y);
|
|
if (m_sinA < 0.00005 && m_sinA > -0.00005) return;
|
|
else if (m_sinA > 1.0) m_sinA = 1.0;
|
|
else if (m_sinA < -1.0) m_sinA = -1.0;
|
|
|
|
if (m_sinA * m_delta < 0)
|
|
{
|
|
m_destPoly.push_back(IntPoint(Round(m_srcPoly[j].X + m_normals[k].X * m_delta),
|
|
Round(m_srcPoly[j].Y + m_normals[k].Y * m_delta)));
|
|
m_destPoly.push_back(m_srcPoly[j]);
|
|
m_destPoly.push_back(IntPoint(Round(m_srcPoly[j].X + m_normals[j].X * m_delta),
|
|
Round(m_srcPoly[j].Y + m_normals[j].Y * m_delta)));
|
|
}
|
|
else
|
|
switch (jointype)
|
|
{
|
|
case jtMiter:
|
|
{
|
|
double r = 1 + (m_normals[j].X * m_normals[k].X +
|
|
m_normals[j].Y * m_normals[k].Y);
|
|
if (r >= m_miterLim) DoMiter(j, k, r); else DoSquare(j, k);
|
|
break;
|
|
}
|
|
case jtSquare: DoSquare(j, k); break;
|
|
case jtRound: DoRound(j, k); break;
|
|
}
|
|
k = j;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void ClipperOffset::DoSquare(int j, int k)
|
|
{
|
|
double dx = std::tan(std::atan2(m_sinA,
|
|
m_normals[k].X * m_normals[j].X + m_normals[k].Y * m_normals[j].Y) / 4);
|
|
m_destPoly.push_back(IntPoint(
|
|
Round(m_srcPoly[j].X + m_delta * (m_normals[k].X - m_normals[k].Y * dx)),
|
|
Round(m_srcPoly[j].Y + m_delta * (m_normals[k].Y + m_normals[k].X * dx))));
|
|
m_destPoly.push_back(IntPoint(
|
|
Round(m_srcPoly[j].X + m_delta * (m_normals[j].X + m_normals[j].Y * dx)),
|
|
Round(m_srcPoly[j].Y + m_delta * (m_normals[j].Y - m_normals[j].X * dx))));
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void ClipperOffset::DoMiter(int j, int k, double r)
|
|
{
|
|
double q = m_delta / r;
|
|
m_destPoly.push_back(IntPoint(Round(m_srcPoly[j].X + (m_normals[k].X + m_normals[j].X) * q),
|
|
Round(m_srcPoly[j].Y + (m_normals[k].Y + m_normals[j].Y) * q)));
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void ClipperOffset::DoRound(int j, int k)
|
|
{
|
|
double a = std::atan2(m_sinA,
|
|
m_normals[k].X * m_normals[j].X + m_normals[k].Y * m_normals[j].Y);
|
|
int steps = (int)Round(m_StepsPerRad * std::fabs(a));
|
|
|
|
double X = m_normals[k].X, Y = m_normals[k].Y, X2;
|
|
for (int i = 0; i < steps; ++i)
|
|
{
|
|
m_destPoly.push_back(IntPoint(
|
|
Round(m_srcPoly[j].X + X * m_delta),
|
|
Round(m_srcPoly[j].Y + Y * m_delta)));
|
|
X2 = X;
|
|
X = X * m_cos - m_sin * Y;
|
|
Y = X2 * m_sin + Y * m_cos;
|
|
}
|
|
m_destPoly.push_back(IntPoint(
|
|
Round(m_srcPoly[j].X + m_normals[j].X * m_delta),
|
|
Round(m_srcPoly[j].Y + m_normals[j].Y * m_delta)));
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Miscellaneous public functions
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Clipper::DoSimplePolygons()
|
|
{
|
|
PolyOutList::size_type i = 0;
|
|
while (i < m_PolyOuts.size())
|
|
{
|
|
OutRec* outrec = m_PolyOuts[i++];
|
|
OutPt* op = outrec->Pts;
|
|
if (!op) continue;
|
|
do //for each Pt in Polygon until duplicate found do ...
|
|
{
|
|
OutPt* op2 = op->Next;
|
|
while (op2 != outrec->Pts)
|
|
{
|
|
if ((op->Pt == op2->Pt) && op2->Next != op && op2->Prev != op)
|
|
{
|
|
//split the polygon into two ...
|
|
OutPt* op3 = op->Prev;
|
|
OutPt* op4 = op2->Prev;
|
|
op->Prev = op4;
|
|
op4->Next = op;
|
|
op2->Prev = op3;
|
|
op3->Next = op2;
|
|
|
|
outrec->Pts = op;
|
|
OutRec* outrec2 = CreateOutRec();
|
|
outrec2->Pts = op2;
|
|
UpdateOutPtIdxs(*outrec2);
|
|
if (Poly2ContainsPoly1(outrec2->Pts, outrec->Pts))
|
|
{
|
|
//OutRec2 is contained by OutRec1 ...
|
|
outrec2->IsHole = !outrec->IsHole;
|
|
outrec2->FirstLeft = outrec;
|
|
}
|
|
else
|
|
if (Poly2ContainsPoly1(outrec->Pts, outrec2->Pts))
|
|
{
|
|
//OutRec1 is contained by OutRec2 ...
|
|
outrec2->IsHole = outrec->IsHole;
|
|
outrec->IsHole = !outrec2->IsHole;
|
|
outrec2->FirstLeft = outrec->FirstLeft;
|
|
outrec->FirstLeft = outrec2;
|
|
} else
|
|
{
|
|
//the 2 polygons are separate ...
|
|
outrec2->IsHole = outrec->IsHole;
|
|
outrec2->FirstLeft = outrec->FirstLeft;
|
|
}
|
|
op2 = op; //ie get ready for the Next iteration
|
|
}
|
|
op2 = op2->Next;
|
|
}
|
|
op = op->Next;
|
|
}
|
|
while (op != outrec->Pts);
|
|
}
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void ReversePath(Path& p)
|
|
{
|
|
std::reverse(p.begin(), p.end());
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void ReversePaths(Paths& p)
|
|
{
|
|
for (Paths::size_type i = 0; i < p.size(); ++i)
|
|
ReversePath(p[i]);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void SimplifyPolygon(const Path &in_poly, Paths &out_polys, PolyFillType fillType)
|
|
{
|
|
Clipper c;
|
|
c.StrictlySimple(true);
|
|
c.AddPath(in_poly, ptSubject, true);
|
|
c.Execute(ctUnion, out_polys, fillType, fillType);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void SimplifyPolygons(const Paths &in_polys, Paths &out_polys, PolyFillType fillType)
|
|
{
|
|
Clipper c;
|
|
c.StrictlySimple(true);
|
|
c.AddPaths(in_polys, ptSubject, true);
|
|
c.Execute(ctUnion, out_polys, fillType, fillType);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void SimplifyPolygons(Paths &polys, PolyFillType fillType)
|
|
{
|
|
SimplifyPolygons(polys, polys, fillType);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
inline double DistanceSqrd(const IntPoint& pt1, const IntPoint& pt2)
|
|
{
|
|
double Dx = ((double)pt1.X - pt2.X);
|
|
double dy = ((double)pt1.Y - pt2.Y);
|
|
return (Dx*Dx + dy*dy);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
double DistanceFromLineSqrd(
|
|
const IntPoint& pt, const IntPoint& ln1, const IntPoint& ln2)
|
|
{
|
|
//The equation of a line in general form (Ax + By + C = 0)
|
|
//given 2 points (x�,y�) & (x�,y�) is ...
|
|
//(y� - y�)x + (x� - x�)y + (y� - y�)x� - (x� - x�)y� = 0
|
|
//A = (y� - y�); B = (x� - x�); C = (y� - y�)x� - (x� - x�)y�
|
|
//perpendicular distance of point (x�,y�) = (Ax� + By� + C)/Sqrt(A� + B�)
|
|
//see http://en.wikipedia.org/wiki/Perpendicular_distance
|
|
double A = double(ln1.Y - ln2.Y);
|
|
double B = double(ln2.X - ln1.X);
|
|
double C = A * ln1.X + B * ln1.Y;
|
|
C = A * pt.X + B * pt.Y - C;
|
|
return (C * C) / (A * A + B * B);
|
|
}
|
|
//---------------------------------------------------------------------------
|
|
|
|
bool SlopesNearCollinear(const IntPoint& pt1,
|
|
const IntPoint& pt2, const IntPoint& pt3, double distSqrd)
|
|
{
|
|
return DistanceFromLineSqrd(pt2, pt1, pt3) < distSqrd;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
bool PointsAreClose(IntPoint pt1, IntPoint pt2, double distSqrd)
|
|
{
|
|
double Dx = (double)pt1.X - pt2.X;
|
|
double dy = (double)pt1.Y - pt2.Y;
|
|
return ((Dx * Dx) + (dy * dy) <= distSqrd);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
OutPt* ExcludeOp(OutPt* op)
|
|
{
|
|
OutPt* result = op->Prev;
|
|
result->Next = op->Next;
|
|
op->Next->Prev = result;
|
|
result->Idx = 0;
|
|
return result;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void CleanPolygon(const Path& in_poly, Path& out_poly, double distance)
|
|
{
|
|
//distance = proximity in units/pixels below which vertices
|
|
//will be stripped. Default ~= sqrt(2).
|
|
|
|
size_t size = in_poly.size();
|
|
|
|
if (size == 0)
|
|
{
|
|
out_poly.clear();
|
|
return;
|
|
}
|
|
|
|
OutPt* outPts = new OutPt[size];
|
|
for (size_t i = 0; i < size; ++i)
|
|
{
|
|
outPts[i].Pt = in_poly[i];
|
|
outPts[i].Next = &outPts[(i + 1) % size];
|
|
outPts[i].Next->Prev = &outPts[i];
|
|
outPts[i].Idx = 0;
|
|
}
|
|
|
|
double distSqrd = distance * distance;
|
|
OutPt* op = &outPts[0];
|
|
while (op->Idx == 0 && op->Next != op->Prev)
|
|
{
|
|
if (PointsAreClose(op->Pt, op->Prev->Pt, distSqrd))
|
|
{
|
|
op = ExcludeOp(op);
|
|
size--;
|
|
}
|
|
else if (PointsAreClose(op->Prev->Pt, op->Next->Pt, distSqrd))
|
|
{
|
|
ExcludeOp(op->Next);
|
|
op = ExcludeOp(op);
|
|
size -= 2;
|
|
}
|
|
else if (SlopesNearCollinear(op->Prev->Pt, op->Pt, op->Next->Pt, distSqrd))
|
|
{
|
|
op = ExcludeOp(op);
|
|
size--;
|
|
}
|
|
else
|
|
{
|
|
op->Idx = 1;
|
|
op = op->Next;
|
|
}
|
|
}
|
|
|
|
if (size < 3) size = 0;
|
|
out_poly.resize(size);
|
|
for (size_t i = 0; i < size; ++i)
|
|
{
|
|
out_poly[i] = op->Pt;
|
|
op = op->Next;
|
|
}
|
|
delete [] outPts;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void CleanPolygon(Path& poly, double distance)
|
|
{
|
|
CleanPolygon(poly, poly, distance);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void CleanPolygons(const Paths& in_polys, Paths& out_polys, double distance)
|
|
{
|
|
for (Paths::size_type i = 0; i < in_polys.size(); ++i)
|
|
CleanPolygon(in_polys[i], out_polys[i], distance);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void CleanPolygons(Paths& polys, double distance)
|
|
{
|
|
CleanPolygons(polys, polys, distance);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void Minkowski(const Path& poly, const Path& path,
|
|
Paths& solution, bool isSum, bool isClosed)
|
|
{
|
|
int delta = (isClosed ? 1 : 0);
|
|
size_t polyCnt = poly.size();
|
|
size_t pathCnt = path.size();
|
|
Paths pp;
|
|
pp.reserve(pathCnt);
|
|
if (isSum)
|
|
for (size_t i = 0; i < pathCnt; ++i)
|
|
{
|
|
Path p;
|
|
p.reserve(polyCnt);
|
|
for (size_t j = 0; j < poly.size(); ++j)
|
|
p.push_back(IntPoint(path[i].X + poly[j].X, path[i].Y + poly[j].Y));
|
|
pp.push_back(p);
|
|
}
|
|
else
|
|
for (size_t i = 0; i < pathCnt; ++i)
|
|
{
|
|
Path p;
|
|
p.reserve(polyCnt);
|
|
for (size_t j = 0; j < poly.size(); ++j)
|
|
p.push_back(IntPoint(path[i].X - poly[j].X, path[i].Y - poly[j].Y));
|
|
pp.push_back(p);
|
|
}
|
|
|
|
Paths quads;
|
|
quads.reserve((pathCnt + delta) * (polyCnt + 1));
|
|
for (size_t i = 0; i <= pathCnt - 2 + delta; ++i)
|
|
for (size_t j = 0; j <= polyCnt - 1; ++j)
|
|
{
|
|
Path quad;
|
|
quad.reserve(4);
|
|
quad.push_back(pp[i % pathCnt][j % polyCnt]);
|
|
quad.push_back(pp[(i + 1) % pathCnt][j % polyCnt]);
|
|
quad.push_back(pp[(i + 1) % pathCnt][(j + 1) % polyCnt]);
|
|
quad.push_back(pp[i % pathCnt][(j + 1) % polyCnt]);
|
|
if (!Orientation(quad)) ReversePath(quad);
|
|
quads.push_back(quad);
|
|
}
|
|
|
|
Clipper c;
|
|
c.AddPaths(quads, ptSubject, true);
|
|
c.Execute(ctUnion, solution, pftNonZero, pftNonZero);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void MinkowskiSum(const Path& poly, const Path& path, Paths& solution, bool isClosed)
|
|
{
|
|
Minkowski(poly, path, solution, true, isClosed);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void MinkowskiDiff(const Path& poly, const Path& path, Paths& solution, bool isClosed)
|
|
{
|
|
Minkowski(poly, path, solution, false, isClosed);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
enum NodeType {ntAny, ntOpen, ntClosed};
|
|
|
|
void AddPolyNodeToPolygons(const PolyNode& polynode, NodeType nodetype, Paths& paths)
|
|
{
|
|
bool match = true;
|
|
if (nodetype == ntClosed) match = !polynode.IsOpen();
|
|
else if (nodetype == ntOpen) return;
|
|
|
|
if (!polynode.Contour.empty() && match)
|
|
paths.push_back(polynode.Contour);
|
|
for (int i = 0; i < polynode.ChildCount(); ++i)
|
|
AddPolyNodeToPolygons(*polynode.Childs[i], nodetype, paths);
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}
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//------------------------------------------------------------------------------
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|
|
|
void PolyTreeToPaths(const PolyTree& polytree, Paths& paths)
|
|
{
|
|
paths.resize(0);
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|
paths.reserve(polytree.Total());
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|
AddPolyNodeToPolygons(polytree, ntAny, paths);
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|
}
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|
//------------------------------------------------------------------------------
|
|
|
|
void ClosedPathsFromPolyTree(const PolyTree& polytree, Paths& paths)
|
|
{
|
|
paths.resize(0);
|
|
paths.reserve(polytree.Total());
|
|
AddPolyNodeToPolygons(polytree, ntClosed, paths);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
void OpenPathsFromPolyTree(PolyTree& polytree, Paths& paths)
|
|
{
|
|
paths.resize(0);
|
|
paths.reserve(polytree.Total());
|
|
//Open paths are top level only, so ...
|
|
for (int i = 0; i < polytree.ChildCount(); ++i)
|
|
if (polytree.Childs[i]->IsOpen())
|
|
paths.push_back(polytree.Childs[i]->Contour);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
std::ostream& operator <<(std::ostream &s, const IntPoint &p)
|
|
{
|
|
s << "(" << p.X << "," << p.Y << ")";
|
|
return s;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
std::ostream& operator <<(std::ostream &s, const Path &p)
|
|
{
|
|
if (p.empty()) return s;
|
|
Path::size_type last = p.size() -1;
|
|
for (Path::size_type i = 0; i < last; i++)
|
|
s << "(" << p[i].X << "," << p[i].Y << "), ";
|
|
s << "(" << p[last].X << "," << p[last].Y << ")\n";
|
|
return s;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
std::ostream& operator <<(std::ostream &s, const Paths &p)
|
|
{
|
|
for (Paths::size_type i = 0; i < p.size(); i++)
|
|
s << p[i];
|
|
s << "\n";
|
|
return s;
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
#ifdef use_deprecated
|
|
|
|
void OffsetPaths(const Paths &in_polys, Paths &out_polys,
|
|
double delta, JoinType jointype, EndType_ endtype, double limit)
|
|
{
|
|
ClipperOffset co(limit, limit);
|
|
co.AddPaths(in_polys, jointype, (EndType)endtype);
|
|
co.Execute(out_polys, delta);
|
|
}
|
|
//------------------------------------------------------------------------------
|
|
|
|
#endif
|
|
|
|
|
|
} //ClipperLib namespace
|