fixed AFront issue

src/org/poly2tri/Poly2Tri.scala

@@ -85,7 +85,7 @@ class Poly2TriDemo extends BasicGame("Poly2Tri") {
   val strange = "data/strange.dat"
   val i18 = "data/i.18"
   
-  var currentModel = i18
+  var currentModel = strange
   
   var mouseButton = 0
   var mousePressed = false

src/org/poly2tri/cdt/AFront.scala

@@ -56,6 +56,17 @@ class AFront(iTriangle: Triangle) {
     null
   }
   
+  // Locate node containing given point
+  def locatePoint(point: Point): Node = {
+    var node = head
+    while(node != tail) {
+      if(point == node.point)
+        return node
+      node = node.next
+    }
+    null
+  }
+  
   def insert(tuple: Tuple3[Point, Triangle, Node]) = {
     val (point, triangle, nNode) = tuple
     val node = new Node(point, triangle)

src/org/poly2tri/cdt/CDT.scala

@@ -132,16 +132,11 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
     for(i <- 1 until points.size) {
       val point = points(i)
       // Process Point event
-      var triangle: Triangle = null
+      var triangle = pointEvent(point)
-      try {
-        triangle = pointEvent(point)
-      } catch {
-        case e: Exception => 
-          println("Offending triangle = " + i)
-      }
       // Process edge events
-      point.edges.foreach(e => edgeEvent(e, triangle))
+      point.edges.foreach(e => triangle = edgeEvent(e, triangle))
       if(i == 7) {cleanTri = triangle; mesh.debug += cleanTri}
+      // strange = 13; star & i18 = 7
     }
   }  
   
@@ -226,16 +221,14 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
   }
   
   // EdgeEvent
-  private def edgeEvent(edge: Segment, triangle: Triangle) { 
+  private def edgeEvent(edge: Segment, triangle: Triangle): Triangle = { 
     
     // STEP 1: Locate the first intersected triangle
     val firstTriangle = triangle.locateFirst(edge)
     
-    val contains = if(firstTriangle != null) firstTriangle.contains(edge) else false
-    
     // STEP 2: Remove intersected triangles
-    if(firstTriangle != null && !contains) {
+    if(firstTriangle != null && !firstTriangle.contains(edge)) {
-      
+
        // Collect intersected triangles
        val tList = new ArrayBuffer[Triangle]
        tList += firstTriangle
@@ -252,9 +245,8 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
        
         // Remove old triangles; collect neighbor triangles
         tList.foreach(t => {
-          t.neighbors.foreach(n => if(n != null) nTriangles += n)
+          t.neighbors.foreach(n => if(n != null && !tList.contains(n)) nTriangles += n)
           mesh.map -= t
-          //mesh.debug += t
         })
       
 		val lPoints = new ArrayBuffer[Point]
@@ -268,7 +260,7 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
 		  tList.foreach(t => {
 		    t.points.foreach(p => {
 		      if(p != edge.q && p != edge.p) {
-		        if(t.orient(point1, point2, p) >= 0 ) {
+		        if(t.orient(point1, point2, p) > 0 ) {
 		          // Keep duplicate points out
                   if(!lPoints.contains(p)) {
 		            lPoints += p
@@ -290,56 +282,50 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
       
       // Update advancing front
   
-      val qNode = aFront.locate(edge.q)  
+      val qNode = aFront.locatePoint(edge.q)  
-      val pNode = aFront.locate(edge.p)
+      val pNode = aFront.locatePoint(edge.p)
-      println(tList.size)
       
       for(t <- tList) {
         
         if(qNode.triangle == t) {
-          println("node")
           val p1 = qNode.point
           val p2 = qNode.next.point
           T1.foreach(tri => if(tri.contains(p1, p2)) qNode.triangle = tri)
           T2.foreach(tri => if(tri.contains(p1, p2)) qNode.triangle = tri)
         } else if(qNode.prev.triangle == t) {
-          println("prev node")
           val p1 = qNode.prev.point
           val p2 = qNode.point
           T1.foreach(tri => if(tri.contains(p1, p2)) qNode.prev.triangle = tri)
           T2.foreach(tri => if(tri.contains(p1, p2)) qNode.prev.triangle = tri)
-        } else if(qNode.next.triangle == t) {
+        } 
-          println("next node")
-        } else
         
-        if(pNode.triangle == t) {
+        if(pNode != null) {
-          println("Pnode")
+	        if(pNode.triangle == t) {
-          val p1 = pNode.point
+	          val p1 = pNode.point
-          val p2 = pNode.next.point
+	          val p2 = pNode.next.point
-          T1.foreach(tri => if(tri.contains(p1, p2)) pNode.triangle = tri)
+	          T1.foreach(tri => if(tri.contains(p1, p2)) pNode.triangle = tri)
-          T2.foreach(tri => if(tri.contains(p1, p2)) pNode.triangle = tri)
+	          T2.foreach(tri => if(tri.contains(p1, p2)) pNode.triangle = tri)
-        } else if(pNode.prev.triangle == t) {
+	        } else if(pNode.prev.triangle == t) {
-          println("prev Pnode")
+	          val p1 = pNode.point
-          val p1 = pNode.point
+	          val p2 = pNode.prev.point
-          val p2 = pNode.prev.point
+	          T1.foreach(tri => if(tri.contains(p1, p2)) pNode.prev.triangle = tri)
-          T1.foreach(tri => if(tri.contains(p1, p2)) pNode.prev.triangle = tri)
+	          T2.foreach(tri => if(tri.contains(p1, p2)) pNode.prev.triangle = tri)
-          T2.foreach(tri => if(tri.contains(p1, p2)) pNode.prev.triangle = tri)
+	        } 
-        } else if(pNode.next.triangle == t) {
-          println("next Pnode")
         }
+        
       }
       
       // Update neighbors
-      //updateNeighbors(nTriangles, T1)
+      updateNeighbors(nTriangles, T1)
       updateNeighbors(nTriangles, T2)
-      //nTriangles.foreach(n => n.printDebug)
       
        // Mark constrained edges
        T1.first.mark(point1, point2)
        T2.first.mark(point1, point2)
-           
-       //TODO update neighbor pointers
        
+       // Double check returning T2.first vs T1.first      
+       T2.first
+
     } else if(firstTriangle == null) {
      
       // No triangles are intersected by the edge; edge must lie outside the mesh
@@ -354,8 +340,9 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
       val nTriangles = new ArrayBuffer[Triangle]
       
       var node = aFront.locate(point1)
+      
       val first = node
-      nTriangles += first.triangle
+      nTriangles += node.triangle
       
       node = node.next
       
@@ -372,6 +359,7 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
       triangulate(points.toArray, endPoints, T)
       
       // Update advancing front 
+      
       aFront -= (first, node.prev, T.first)
       
       // Update neighbors
@@ -379,11 +367,15 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
       
        // Mark constrained edge
       T.first mark(edge.p, edge.q)
-
+      
+      triangle
+      
     } else { 
       // Mark constrained edge
       firstTriangle mark(edge.p, edge.q)
+     triangle
     }
+    
   }
   
   // Update neigbor pointers for edge event

src/org/poly2tri/shapes/Triangle.scala

@@ -62,7 +62,7 @@ class Triangle(val points: Array[Point], val neighbors: Array[Triangle]) {
   }
   
   // Update neighbor pointers
-  def markNeighbor(p1: Point, p2: Point, triangle: Triangle) {
+  def markNeighbor(p1: Point, p2: Point, triangle: Triangle) {    
     if((p1 == points(2) && p2 == points(1)) || (p1 == points(1) && p2 == points(2))) 
       neighbors(0) = triangle 
     else if((p1 == points(0) && p2 == points(2)) || (p1 == points(2) && p2 == points(0)))