changed Seidel init and process

data/nazca_heron.dat

@@ -580,7 +580,6 @@
 82.9798 3.14365
 81.8622 3.11751
 80.976 2.96988
-80.0621 2.84425
 81.0885 3.47024
 81.9378 3.6489
 82.4922 3.83974

src/org/poly2tri/Poly2Tri.scala

@@ -87,7 +87,7 @@ class Poly2TriDemo extends BasicGame("Poly2Tri") {
   val i18 = "data/i.18"
   val tank = "data/tank.dat"
   
-  var currentModel = tank
+  var currentModel = nazcaHeron
   var doCDT = true
   
   var mouseButton = 0
@@ -378,10 +378,8 @@ class Poly2TriDemo extends BasicGame("Poly2Tri") {
     if(!drawEarClip) {  
         
 	    // Sediel triangulation
-	    seidel = new Triangulator(segments)
-        
         val t1 = System.nanoTime
-	    seidel.process
+	    seidel = new Triangulator(points)
         val runTime = System.nanoTime - t1
 	   
 	    println("Poly2Tri average (ms) =  " + runTime*1e-6)

src/org/poly2tri/cdt/CDT.scala

@@ -127,21 +127,15 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
   private def sweep {
     
     for(i <- 1 until points.size) {
-      
-      try {
       val point = points(i)
       // Process Point event
       val node = pointEvent(point)
       if(i == CDT.clearPoint) {cleanTri = node.triangle; mesh.debug += cleanTri}
       // Process edge events
       point.edges.foreach(e => edgeEvent(e, node))
-      } catch {
-        case e: Exception =>
-          throw new Exception("Suspect point = " + i)
     }
     
   }  
-  }  
   
   // Final step in the sweep-line CDT algo
   // Clean exterior triangles
@@ -176,7 +170,7 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
     
     // Locate the first intersected triangle
     val firstTriangle = node.triangle.locateFirst(edge)
-    
+    //if(firstTriangle != null)mesh.debug += firstTriangle
     // Remove intersected triangles
     if(firstTriangle != null && !firstTriangle.contains(edge)) {
        
@@ -342,27 +336,28 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
   }
 
   // Scan left and right along AFront to fill holes
-  private def scanAFront(n: Node) {
+  private def scanAFront(n: Node) = {
     
-    var node = n.next
+    var node1 = n.next
     // Update right
-    if(node.next != null) {
+    if(node1.next != null) {
       var angle = 0.0
       do {
-        angle = fill(node)
+        angle = fill(node1)
-        node = node.next
+        node1 = node1.next
-      } while(angle <= PI_2 && node.next != null) 
+      } while(angle <= PI_2 && node1.next != null) 
     }
     
-    node = n.prev
+    var node2 = n.prev
     // Update left
-    if(node.prev != null) {
+    if(node2.prev != null) {
       var angle = 0.0
       do {
-	    angle = fill(node)
+	    angle = fill(node2)
-        node = node.prev
+        node2 = node2.prev
-      } while(angle <= PI_2 && node.prev != null)
+      } while(angle <= PI_2 && node2.prev != null)
     }
+    
   }
   
   // Fill empty space with a triangle

src/org/poly2tri/seidel/Triangulator.scala

@@ -39,15 +39,28 @@ import shapes.{Point, Segment, Trapezoid}
 // algorithm for computing trapezoidal decompositions and for triangulating polygons"
 // See also: "Computational Geometry", 3rd edition, by Mark de Berg et al, Chapter 6.2
 //           "Computational Geometry in C", 2nd edition, by Joseph O'Rourke
-class Triangulator(segments: ArrayBuffer[Segment]) {
+class Triangulator(points: ArrayBuffer[Point]) {
   
   // Convex polygon list
   var polygons = new ArrayBuffer[Array[Point]]
   // Order and randomize the segments
-  val segmentList = orderSegments
+  val segmentList = initSegments
+  
+  // The trapezoidal map 
+  def trapezoidMap = trapezoidalMap.map
+  // Trapezoid decomposition list
+  var trapezoids = new ArrayBuffer[Trapezoid]
+  
+  // Initialize trapezoidal map and query structure
+  private val trapezoidalMap = new TrapezoidalMap
+  private val boundingBox = trapezoidalMap.boundingBox(segmentList)
+  private val queryGraph = new QueryGraph(Sink.init(boundingBox))
+  private val xMonoPoly = new ArrayBuffer[MonotoneMountain]
+  
+  process
   
   // Build the trapezoidal map and query graph
-  def process {
+  private def process {
 
     var i = 0
     while(i < segmentList.size) {
@@ -117,11 +130,6 @@ class Triangulator(segments: ArrayBuffer[Segment]) {
     //println("# triangles = " + triangles.size)
   }
   
-  // The trapezoidal map 
-  def trapezoidMap = trapezoidalMap.map
-  // Trapezoid decomposition list
-  var trapezoids = new ArrayBuffer[Trapezoid]
-  
   // Monotone polygons - these are monotone mountains
   def monoPolies: ArrayBuffer[ArrayBuffer[Point]] = {
     val polies = new ArrayBuffer[ArrayBuffer[Point]]
@@ -130,12 +138,6 @@ class Triangulator(segments: ArrayBuffer[Segment]) {
     return polies
   }
   
-  // Initialize trapezoidal map and query structure
-  private val trapezoidalMap = new TrapezoidalMap
-  private val boundingBox = trapezoidalMap.boundingBox(segmentList)
-  private val queryGraph = new QueryGraph(Sink.init(boundingBox))
-  private val xMonoPoly = new ArrayBuffer[MonotoneMountain]
-  
   // Build a list of x-monotone mountains
   private def createMountains {
     
@@ -190,7 +192,17 @@ class Triangulator(segments: ArrayBuffer[Segment]) {
 	  }
   }
   
-  private def orderSegments = {
+  // Create segments and connect end points; update edge event pointer
+  private def initSegments: ArrayBuffer[Segment] = {
+    var segments = List[Segment]()
+    for(i <- 0 until points.size-1) 
+      segments = new Segment(points(i), points(i+1)) :: segments
+    segments =  new Segment(points.first, points.last) :: segments
+    orderSegments(segments)
+  }
+  
+  private def orderSegments(segments: List[Segment]) = {
+    
     // Ignore vertical segments!
     val segs = new ArrayBuffer[Segment]
     for(s <- segments) {