Fix bug 2460

diff --git a/lib/dotgen/compound.c b/lib/dotgen/compound.c
index 7156103af7a271337d917e73a2fa5e443c9a8d8e..dbbc2752602c0b0b98d77597b35e8745108ba379 100644 (file)
--- 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