From: Emden R. Gansner <erg@alum.mit.edu>
Date: Tue, 12 Aug 2014 18:45:44 +0000 (-0400)
Subject: Fix case for curved edges when centroid is identical to the midpoint of an edge
X-Git-Tag: TRAVIS_CI_BUILD_EXPERIMENTAL~175
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=489f1a73936c7d0069defe6c23371ed4727644b1;p=graphviz

Fix case for curved edges when centroid is identical to the midpoint of an edge
---

diff --git a/lib/common/routespl.c b/lib/common/routespl.c
index 3a2d5b84e..c0e500a02 100644
--- a/lib/common/routespl.c
+++ b/lib/common/routespl.c
@@ -918,6 +918,7 @@ static void bend(pointf spl[4], pointf centroid)
         double vX = centroid.x - midpt.x;
         double vY = centroid.y - midpt.y;
         double magV = sqrt(vX*vX + vY*vY);
+	if (magV == 0) return;  /* if midpoint == centroid, don't divide by zero */
         a.x = midpt.x - vX / magV * r;      /* + would be closest point */
         a.y = midpt.y - vY / magV * r;
     }