fixed floating point rounding bug

src/org/poly2tri/Poly2Tri.scala

@@ -171,13 +171,14 @@ class Poly2TriDemo extends BasicGame("Poly2Tri") {
     val p16 = Point(300,312)
     
     segments = new ArrayBuffer[Segment]
-    segments += new Segment(p1, p2)
     segments += new Segment(p2, p3)
-    segments += new Segment(p3, p4)
+    segments += new Segment(p1, p2)
+    segments += new Segment(p7, p1)
     segments += new Segment(p4, p5)
+    segments += new Segment(p3, p4)
     segments += new Segment(p5, p6)
     segments += new Segment(p6, p7) 
-    segments += new Segment(p7, p8)
+    segments += new Segment(p3, p4)
     segments += new Segment(p8, p9)
     segments += new Segment(p9, p10)
     segments += new Segment(p10, p11) 

src/org/poly2tri/Segment.scala

@@ -49,7 +49,7 @@ class Segment(var p: Point, var q: Point) {
   val b = p.y - (p.x * slope)
   
   // Determines if this segment lies above the given point
-  def > (point: Point) = (point.y < slope * point.x + b)
+  def > (point: Point) = (point.y < Math.floor(slope * point.x + b))
   // Determines if this segment lies below the given point
   def < (point: Point) = (point.y > slope * point.x + b) 
 

src/org/poly2tri/Triangulator.scala

@@ -148,7 +148,7 @@ class Triangulator(segments: ArrayBuffer[Segment]) {
     // Randomized triangulation improves performance
     // See Seidel's paper, or O'Rourke's book, p. 57 
     // Turn this off for now because of pointer bug somewhere in DAG / trapezoidal map
-    //Random.shuffle(segs)
+    Random.shuffle(segs)
     segs
   }
 }

src/org/poly2tri/YNode.scala

@@ -35,10 +35,11 @@ class YNode(segment: Segment, lChild: Node, rChild: Node) extends Node(lChild, r
   override def locate(s: Segment): Sink = {
     if (segment > s.p) {
       // Move down the graph
-      right.locate(s)
+      return right.locate(s)
     } else if (segment < s.p){
       // Move up the graph
-      left.locate(s)
+      return left.locate(s)
+      
     } else {
       // s and segment share the same endpoint, p
       if (s.slope < segment.slope) {