From c33163e98065686e0ffe81b882ebffe309ca5537 Mon Sep 17 00:00:00 2001
From: azv <azv@opencascade.com>
Date: Sat, 6 May 2017 16:15:42 +0300
Subject: [PATCH] Issue #2158: Crash when trimming a circle

Do not cast tangent curves to arcs when they have a shared point (i.e. arc and circle may have shared point or constraint has been changed by not processed by solver),
---
 src/SketchSolver/SketchSolver_ConstraintTangent.cpp | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/src/SketchSolver/SketchSolver_ConstraintTangent.cpp b/src/SketchSolver/SketchSolver_ConstraintTangent.cpp
index ff72f310d..8fa16bc68 100644
--- a/src/SketchSolver/SketchSolver_ConstraintTangent.cpp
+++ b/src/SketchSolver/SketchSolver_ConstraintTangent.cpp
@@ -351,14 +351,12 @@ ConstraintWrapperPtr createArcArcTangency(EntityWrapperPtr theEntity1,
 
   GCSConstraintPtr aNewConstr;
   if (theSharedPoint) {
-    std::shared_ptr<GCS::Arc> anArc1 = std::dynamic_pointer_cast<GCS::Arc>(aCirc1);
-    std::shared_ptr<GCS::Arc> anArc2 = std::dynamic_pointer_cast<GCS::Arc>(aCirc2);
     GCSPointPtr aPoint =
         std::dynamic_pointer_cast<PlaneGCSSolver_PointWrapper>(theSharedPoint)->point();
 
-    adjustAngleBetweenCurves(anArc1, anArc2, aPoint, theAngle);
+    adjustAngleBetweenCurves(aCirc1, aCirc2, aPoint, theAngle);
     aNewConstr =
-        GCSConstraintPtr(new GCS::ConstraintAngleViaPoint(*anArc1, *anArc2, *aPoint, theAngle));
+        GCSConstraintPtr(new GCS::ConstraintAngleViaPoint(*aCirc1, *aCirc2, *aPoint, theAngle));
   } else {
     aNewConstr = GCSConstraintPtr(new GCS::ConstraintTangentCircumf(aCirc1->center, aCirc2->center,
                                   aCirc1->rad, aCirc2->rad, theInternalTangency));
-- 
2.39.2