From 20d233731eaae06b9a75280a2ca675bc9a11cc72 Mon Sep 17 00:00:00 2001
From: nds <nds@opencascade.com>
Date: Mon, 7 Sep 2015 16:20:18 +0300
Subject: [PATCH] #878 Segmentation fault when setting distance on the two same
 points

Crash by click in the same point, caused by OCCT dir2d
---
 src/SketchPlugin/SketchPlugin_ConstraintDistance.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/SketchPlugin/SketchPlugin_ConstraintDistance.cpp b/src/SketchPlugin/SketchPlugin_ConstraintDistance.cpp
index 6b1dd6bec..7eeee4267 100644
--- a/src/SketchPlugin/SketchPlugin_ConstraintDistance.cpp
+++ b/src/SketchPlugin/SketchPlugin_ConstraintDistance.cpp
@@ -277,6 +277,9 @@ void SketchPlugin_ConstraintDistance::attributeChanged(const std::string& theID)
     } else
       return;
 
+    if (aEndPnt->distance(aStartPnt) < tolerance)
+      return;
+
     std::shared_ptr<GeomAPI_Dir2d> aLineDir(new GeomAPI_Dir2d(aEndPnt->decreased(aStartPnt)));
     std::shared_ptr<GeomAPI_XY> aFlyoutDir = aFlyoutPnt->xy()->decreased(aStartPnt);
 
-- 
2.39.2