From fa39acfc2f3d4c4e58ee89c2b41c850d6e17baa7 Mon Sep 17 00:00:00 2001
From: jean-pierre charras <jp.charras@wanadoo.fr>
Date: Sat, 31 Mar 2018 18:43:12 +0200
Subject: [PATCH] Gerbview, export to pcbnew : export polygons as new
 DRAWSEGMENT polygonal shape.

It can creates issues on copper layers, but the only one other alternative is to ignore polygons in export,
and this is worst.
---
 gerbview/export_to_pcbnew.cpp | 59 +++++++++++++++++++++++++++++++++--
 1 file changed, 57 insertions(+), 2 deletions(-)

diff --git a/gerbview/export_to_pcbnew.cpp b/gerbview/export_to_pcbnew.cpp
index 3f35ddf6f4..f428f8d76f 100644
--- a/gerbview/export_to_pcbnew.cpp
+++ b/gerbview/export_to_pcbnew.cpp
@@ -72,7 +72,6 @@ public:
 
 private:
     /**
-     * Function export_non_copper_item
      * write a non copper line or arc to the board file.
      * @param aGbrItem = the Gerber item (line, arc) to export
      * @param aLayer = the technical layer to use
@@ -80,7 +79,13 @@ private:
     void    export_non_copper_item( GERBER_DRAW_ITEM* aGbrItem, LAYER_NUM aLayer );
 
     /**
-     * Function export_copper_item
+     * write a non copper polygon item to the board file.
+     * @param aGbrItem = the Gerber item (line, arc) to export
+     * @param aLayer = the technical layer to use
+     */
+    void    writePcbPolygonItem( GERBER_DRAW_ITEM* aGbrItem, LAYER_NUM aLayer );
+
+    /**
      * write a track or via) to the board file.
      * @param aGbrItem = the Gerber item (line, arc, flashed) to export
      * @param aLayer = the copper layer to use
@@ -281,6 +286,12 @@ void GBR_TO_PCB_EXPORTER::export_non_copper_item( GERBER_DRAW_ITEM* aGbrItem, LA
     wxPoint seg_start   = aGbrItem->m_Start;
     wxPoint seg_end     = aGbrItem->m_End;
 
+    if( aGbrItem->m_Shape == GBR_POLYGON )
+    {
+        writePcbPolygonItem( aGbrItem, aLayer );
+        return;
+    }
+
     if( aGbrItem->m_Shape == GBR_ARC )
     {
         double  a = atan2( (double) ( aGbrItem->m_Start.y - aGbrItem->m_ArcCentre.y),
@@ -319,6 +330,12 @@ void GBR_TO_PCB_EXPORTER::export_copper_item( GERBER_DRAW_ITEM* aGbrItem, LAYER_
         export_segarc_copper_item( aGbrItem, aLayer );
         break;
 
+    case GBR_POLYGON:
+        // Currently: Pcbnew does not really handle polygons on copper layers (no DRC test).
+        // However, we can export them if the purpose of this export is to help recreate a board
+        writePcbPolygonItem( aGbrItem, aLayer );
+        break;
+
     default:
         export_segline_copper_item( aGbrItem, aLayer );
         break;
@@ -504,3 +521,41 @@ void GBR_TO_PCB_EXPORTER::writePcbLineItem( bool aIsArc, wxPoint& aStart, wxPoin
                  );
     }
 }
+
+
+void GBR_TO_PCB_EXPORTER::writePcbPolygonItem( GERBER_DRAW_ITEM* aGbrItem, LAYER_NUM aLayer )
+{
+    fprintf( m_fp, "(gr_poly (pts " );
+
+    SHAPE_POLY_SET polys = aGbrItem->m_Polygon;
+    SHAPE_LINE_CHAIN& poly = polys.Outline( 0 );
+
+    #define MAX_COORD_CNT 4
+    int jj = MAX_COORD_CNT;
+    int cnt_max = poly.PointCount() -1;
+
+    // Do not generate last corner, if it is the same point as the first point:
+    if( poly.Point( 0 ) == poly.Point( cnt_max ) )
+        cnt_max--;
+
+    for( int ii = 0; ii <= cnt_max; ii++ )
+    {
+        if( --jj == 0 )
+        {
+            jj = MAX_COORD_CNT;
+            fprintf( m_fp, "\n" );
+        }
+
+        fprintf( m_fp, " (xy %s %s)",
+                 Double2Str( TO_PCB_UNIT( poly.Point( ii ).x ) ).c_str(),
+                 Double2Str( TO_PCB_UNIT( -poly.Point( ii ).y ) ).c_str() );
+    }
+
+    fprintf( m_fp, ")" );
+
+    if( jj != MAX_COORD_CNT )
+        fprintf( m_fp, "\n" );
+
+    fprintf( m_fp, "(layer %s) (width 0) )\n",
+             TO_UTF8( GetPCBDefaultLayerName( aLayer ) ) );
+}