--- dot.cpp	2002/07/15 20:09:53	1.59
+++ dot.cpp	2002/07/28 20:14:31
@@ -75,7 +75,24 @@ 
     //printf("ReadLine `%s'\n",buf);
     if (strncmp(buf,"rect",4)==0)
     {
+      // obtain the url and the coordinates in the order used by graphviz-1.5
       sscanf(buf,"rect %s %d,%d %d,%d",url,&x1,&y2,&x2,&y1);
+      // later versions of graphviz corrected the y coordinate order
+      // the rule is that y2>=y1, so test and switch if needed
+      if (y2<y1)
+      {
+        int temp=y2;
+        y2=y1;
+        y1=temp;
+      }
+      // there shouldn't be any need for this for known versions of graphviz
+      // but it can't do any harm to check that x follows the rules as well
+      if (x2<x1)
+      {
+        int temp=x2;
+        x2=x1;
+        x1=temp;
+      }
       char *refPtr = url;
       char *urlPtr = strchr(url,'$');
       //printf("url=`%s'\n",url);