issue#198: wrong distance computation for VPolygon.

VadereUtils/src/org/vadere/util/geometry/shapes/VPolygon.java

@@ -406,6 +406,7 @@ public class VPolygon extends Path2D.Double implements VShape {
 
 		PathIterator iterator = this.getPathIterator(null);
 
+		double[] first = null;
 		double[] last = new double[2];
 		double[] next = new double[2];
 		VPoint currentClosest;
@@ -417,6 +418,10 @@ public class VPolygon extends Path2D.Double implements VShape {
 			last[0] = next[0];
 			last[1] = next[1];
 
+			if(first == null) {
+				first = new double[]{last[0], last[1]};
+			}
+
 			iterator.currentSegment(next);
 
 			currentClosest = GeometryUtils.closestToSegment(new VLine(last[0],
@@ -430,6 +435,17 @@ public class VPolygon extends Path2D.Double implements VShape {
 			iterator.next();
 		}
 
+		// dont forget the last and first point!
+		if(first != null) {
+			currentClosest = GeometryUtils.closestToSegment(new VLine(next[0],
+					next[1], first[0], first[1]), point);
+
+			if (currentClosest.distance(point) < currentMinDistance) {
+				currentMinDistance = currentClosest.distance(point);
+				resultPoint = currentClosest;
+			}
+		}
+
 		return resultPoint;
 	}