From fd0381ea09c08f7c488e55656cf0f956e26a280e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tomasz=20W=C5=82ostowski?= <tomasz.wlostowski@cern.ch>
Date: Mon, 28 Jan 2019 10:28:50 +0100
Subject: [PATCH] router: fix dragging when dragged segment has adjacent
 segment(s) at 180 degree angle

Fixes: lp:1812535
* https://bugs.launchpad.net/kicad/+bug/1812535
---
 pcbnew/router/pns_line.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/pcbnew/router/pns_line.cpp b/pcbnew/router/pns_line.cpp
index 87c8603505..098988067c 100644
--- a/pcbnew/router/pns_line.cpp
+++ b/pcbnew/router/pns_line.cpp
@@ -625,7 +625,7 @@ void LINE::dragSegment45( const VECTOR2I& aP, int aIndex, int aSnappingThreshold
     }
     else
     {
-        if( dir_prev.IsObtuse(drag_dir ) )
+        if( dir_prev.Angle( drag_dir ) & (DIRECTION_45::ANG_OBTUSE | DIRECTION_45::ANG_HALF_FULL) )
         {
             guideA[0] = SEG( s_prev.A, s_prev.A + drag_dir.Left().ToVector() );
             guideA[1] = SEG( s_prev.A, s_prev.A + drag_dir.Right().ToVector() );
@@ -649,13 +649,14 @@ void LINE::dragSegment45( const VECTOR2I& aP, int aIndex, int aSnappingThreshold
     }
     else
     {
-        if( dir_next.IsObtuse( drag_dir ) )
+        if( dir_next.Angle( drag_dir ) & (DIRECTION_45::ANG_OBTUSE | DIRECTION_45::ANG_HALF_FULL) )
         {
             guideB[0] = SEG( s_next.B, s_next.B + drag_dir.Left().ToVector() );
             guideB[1] = SEG( s_next.B, s_next.B + drag_dir.Right().ToVector() );
         }
         else
             guideB[0] = guideB[1] =    SEG( dragged.B, dragged.B + dir_next.ToVector() );
+        
     }
 
     SEG s_current( target, target + drag_dir.ToVector() );