From: Emden R. Gansner <erg@alum.mit.edu>
Date: Wed, 28 May 2014 20:14:20 +0000 (-0400)
Subject: Fix bug 2460
X-Git-Tag: TRAVIS_CI_BUILD_EXPERIMENTAL~205
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=ce55b22ff6be6aad9a748ff363470485a5d0adbb;p=graphviz

Fix bug 2460
---

diff --git a/lib/dotgen/compound.c b/lib/dotgen/compound.c
index 7156103af..dbbc27526 100644
--- a/lib/dotgen/compound.c
+++ b/lib/dotgen/compound.c
@@ -174,16 +174,17 @@ findVertical(pointf * pts, double tmin, double tmax,
     pointf Left[4];
     pointf Right[4];
     double t;
-    int no_cross = countVertCross(pts, xcoord);
+    int no_cross;
 
-    if (tmin >= tmax)
-	return -1.0;
+    if (tmin == tmax)
+	return tmin;
 
+    no_cross = countVertCross(pts, xcoord);
     if (no_cross == 0)
 	return -1.0;
 
-    /* if 1 crossing and on the line x == xcoord (within 1 point) */
-    if ((no_cross == 1) && (ROUND(pts[3].x) == ROUND(xcoord))) {
+    /* if 1 crossing and on the line x == xcoord (within 0.005 point) */
+    if ((no_cross == 1) && (abs(pts[3].x - xcoord) <= 0.005)) {
 	if ((ymin <= pts[3].y) && (pts[3].y <= ymax)) {
 	    return tmax;
 	} else
@@ -215,16 +216,17 @@ findHorizontal(pointf * pts, double tmin, double tmax,
     pointf Left[4];
     pointf Right[4];
     double t;
-    int no_cross = countHorzCross(pts, ycoord);
+    int no_cross;
 
-    if (tmin >= tmax)
-	return -1.0;
+    if (tmin == tmax)
+	return tmin;
 
+    no_cross = countHorzCross(pts, ycoord);
     if (no_cross == 0)
 	return -1.0;
 
-    /* if 1 crossing and on the line y == ycoord (within 1 point) */
-    if ((no_cross == 1) && (ROUND(pts[3].y) == ROUND(ycoord))) {
+    /* if 1 crossing and on the line y == ycoord (within 0.005 point) */
+    if ((no_cross == 1) && (abs(pts[3].y - ycoord) <= 0.005)) {
 	if ((xmin <= pts[3].x) && (pts[3].x <= xmax)) {
 	    return tmax;
 	} else