added pan and zoom

src/org/poly2tri/Poly2Tri.scala

@@ -86,7 +86,19 @@ class Poly2TriDemo extends BasicGame("Poly2Tri") {
   
   var currentModel = strange
   
+  var mouseButton = 0
+  var mousePressed = false
+  var mouseDrag = false
+  var mousePos = Point(0, 0)
+  var mousePosOld = Point(0, 0)
+  var deltaX = 0f
+  var deltaY = 0f
+  var scaleFactor = 1f
+  
+  var gameContainer: GameContainer = null
+  
   def init(container: GameContainer) {
+    gameContainer = container
     selectModel(currentModel)
   }
   
@@ -101,6 +113,9 @@ class Poly2TriDemo extends BasicGame("Poly2Tri") {
     g.drawString("'m' to show trapezoidal map (debug mode)", 10, 564)
     g.drawString("'e' to switch Seidel / EarClip", 10, 576)
     
+    g.scale(scaleFactor, scaleFactor)
+	g.translate(deltaX, deltaY)
+   
     val red = new Color(1f, 0f,0.0f)
     val blue = new Color(0f, 0f, 1f)
     val green = new Color(0f, 1f, 0f)
@@ -180,6 +195,48 @@ class Poly2TriDemo extends BasicGame("Poly2Tri") {
    
   }
   
+  /**
+   * Handle mouseDown events.
+   * @param p The screen location that the mouse is down at.
+   */
+  override def mousePressed(b: Int, x: Int, y: Int) {
+    mouseButton = b
+    mousePressed = true
+    mousePosOld = mousePos
+    mousePos = Point(x, y)
+  }
+  
+  /**
+   * Handle mouseUp events.
+   */
+  override def mouseReleased(b: Int, x: Int, y: Int) {
+    mousePosOld = mousePos
+    mousePos = Point(x,y)
+    mousePressed = false
+  }
+  
+  /**
+   * Handle mouseMove events (TestbedMain also sends mouseDragged events here)
+   * @param p The new mouse location (screen coordinates)
+   */
+  override def mouseMoved(oldX: Int, oldY: Int, x: Int, y: Int) {
+    mousePosOld = mousePos
+    mousePos = Point(x,y)
+    if(mousePressed) {
+	  deltaX += mousePos.x - mousePosOld.x
+      deltaY += mousePos.y - mousePosOld.y
+    }
+  }
+  
+  override def mouseWheelMoved(notches: Int) {
+    if (notches < 0) {
+      scaleFactor = Math.min(300f, scaleFactor * 1.05f);
+    }
+    else if (notches > 0) {
+      scaleFactor = Math.max(.02f, scaleFactor / 1.05f);
+    }
+  }
+  
   override def keyPressed(key:Int, c:Char) {
     
     // ESC

src/org/poly2tri/cdt/CDT.scala

@@ -126,10 +126,15 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
   // Implement sweep-line 
   private def sweep {
     //var cTri: Triangle = null
-    for(i <- 1 until points.size) {
+    for(i <- 1 until 5 /*points.size*/) {
       val point = points(i)
       // Process Point event
-      val triangle = pointEvent(point)
+      var triangle: Triangle = null
+      try {
+        triangle = pointEvent(point)
+      } catch {
+        case e: Exception => println("Offending triangle = " + i)
+      }
       // Process edge events
       point.edges.foreach(e => edgeEvent(e, triangle))
       //if(i == 10) {cTri = triangle; mesh.debug += cTri}
@@ -419,6 +424,7 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
 	    t2.legalize(oPoint, point)
 
 	    // Update neighbor pointers
+        
         val ccwNeighbor = t2.neighborCCW(oPoint)
         
         if(ccwNeighbor != null) {

src/org/poly2tri/shapes/Triangle.scala

@@ -54,7 +54,9 @@ class Triangle(val points: Array[Point], val neighbors: Array[Triangle]) {
       neighbors(2) = triangle
     else {
       mesh += triangle
-      //throw new Exception("Neighbor update error")
+      println(ccwPoint + "," + cwPoint)
+      printDebug
+      throw new Exception("Neighbor update error")
     }
   }