Add workaround to prevent an infinite loop in aCutes GetStarPoints method.

See #58

Author: wo80

src/Triangle/NewLocation.cs

@@ -22,6 +22,10 @@ class NewLocation
     {
         const double EPS = 1e-50;
 
+        // A safeguard to prevent an infinite loop in GetStarPoints method, see
+        // https://github.com/wo80/Triangle.NET/issues/58
+        const int GETSTARPOINTS_SAFEGUARD = 2000;
+
         IPredicates predicates;
 
         Mesh mesh;
@@ -2306,6 +2310,12 @@ private int GetStarPoints(Otri badotri, Vertex p, Vertex q, Vertex r,
                     break;
                 }
 
+                if (numvertices > GETSTARPOINTS_SAFEGUARD)
+                {
+                    numvertices = 0;
+                    break;
+                }
+
             } while (!((Math.Abs(returnPoint[0] - third_x) <= EPS) &&
                      (Math.Abs(returnPoint[1] - third_y) <= EPS)));
             return numvertices / 2;