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https://github.com/jhasse/poly2tri.git
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updated code
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328d8e4962
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@ -76,7 +76,7 @@ class Poly2TriDemo extends BasicGame("Poly2Tri") {
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var hiLighter = 0
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var drawEarClip = false
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var drawCDT = true
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var drawcdtMesh = true
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var drawcdtMesh = false
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val nazcaMonkey = "data/nazca_monkey.dat"
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val bird = "data/bird.dat"
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@ -109,10 +109,12 @@ class Poly2TriDemo extends BasicGame("Poly2Tri") {
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def render(container: GameContainer, g: Graphics) {
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g.drawString("'1-6' to cycle models", 10, 540)
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g.drawString("'SPACE' to turn on debug info", 10, 552)
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g.drawString("'m' to show trapezoidal map (debug mode)", 10, 564)
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g.drawString("'e' to switch Seidel / EarClip", 10, 576)
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g.drawString("'1-6' to cycle models", 10, 520)
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g.drawString("'SPACE' to show Seidel debug info", 10, 532)
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g.drawString("'m' to show trapezoidal map (Seidel debug mode)", 10, 544)
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g.drawString("'e' to switch Seidel / EarClip", 10, 556)
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g.drawString("'d' to switch CDT / Seidel", 10, 568)
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g.drawString("'c' to how CDT mesh", 10, 580)
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g.scale(scaleFactor, scaleFactor)
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g.translate(deltaX, deltaY)
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@ -267,7 +269,7 @@ class Poly2TriDemo extends BasicGame("Poly2Tri") {
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if(c == '6') selectModel(i18)
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if(c == 's') drawSegs = !drawSegs
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if(c == 'c') drawcdtMesh = !drawcdtMesh
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//if(c == 'e') {drawEarClip = !drawEarClip; selectModel(currentModel)}
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if(c == 'e') {drawEarClip = !drawEarClip; drawCDT = false; selectModel(currentModel)}
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}
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def selectModel(model: String) {
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@ -131,19 +131,21 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
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// Implement sweep-line
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private def sweep {
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for(i <- 1 until points.size) {
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val point = points(i)
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// Process Point event
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var triangle = pointEvent(point)
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// Process edge events
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point.edges.foreach(e => triangle = edgeEvent(e, triangle))
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if(i == CDT.clearPoint) {cleanTri = triangle; /*mesh.debug += cleanTri*/}
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if(i == CDT.clearPoint) {cleanTri = triangle; mesh.debug += cleanTri}
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}
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}
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// Final step in the sweep-line CDT algo
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// Clean exterior triangles
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private def finalization {
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mesh.map.foreach(m => m.markEdges)
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mesh clean cleanTri
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//mesh.map.foreach(m => m.edges.foreach(e => if(e) mesh.debug += m))
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@ -172,10 +174,10 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
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// EdgeEvent
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private def edgeEvent(edge: Segment, triangle: Triangle): Triangle = {
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// STEP 1: Locate the first intersected triangle
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// Locate the first intersected triangle
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val firstTriangle = triangle.locateFirst(edge)
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// STEP 2: Remove intersected triangles
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// Remove intersected triangles
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if(firstTriangle != null && !firstTriangle.contains(edge)) {
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// Collect intersected triangles
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@ -206,24 +208,24 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
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val point2 = if(ahead) edge.p else edge.q
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// Collect points left and right of edge
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tList.foreach(t => {
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t.points.foreach(p => {
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if(p != edge.q && p != edge.p) {
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if(t.orient(point1, point2, p) > 0 ) {
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// Keep duplicate points out
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if(!lPoints.contains(p)) {
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lPoints += p
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}
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} else {
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// Keep duplicate points out
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if(!rPoints.contains(p))
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rPoints += p
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tList.foreach(t => {
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t.points.foreach(p => {
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if(p != edge.q && p != edge.p) {
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if(t.orient(point1, point2, p) > 0 ) {
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// Keep duplicate points out
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if(!lPoints.contains(p)) {
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lPoints += p
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}
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}
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})
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} else {
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// Keep duplicate points out
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if(!rPoints.contains(p))
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rPoints += p
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}
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}
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})
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})
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// STEP 3: Triangulate empty areas.
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// Triangulate empty areas.
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val T1 = new ArrayBuffer[Triangle]
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triangulate(lPoints.toArray, List(point1, point2), T1)
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val T2 = new ArrayBuffer[Triangle]
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@ -234,6 +236,8 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
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val qNode = aFront.locatePoint(edge.q)
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val pNode = aFront.locatePoint(edge.p)
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// TODO: Make this more robust....
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for(t <- tList) {
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if(qNode.triangle == t) {
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@ -265,8 +269,8 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
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}
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// Update neighbors
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updateNeighbors(nTriangles, T1)
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updateNeighbors(nTriangles, T2)
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edgeNeighbors(nTriangles, T1)
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edgeNeighbors(nTriangles, T2)
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// Mark constrained edges
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T1.first.mark(point1, point2)
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@ -303,16 +307,15 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
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val endPoints = if(ahead) List(point2, point1) else List(point1, point2)
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// STEP 3: Triangulate empty areas.
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// Triangulate empty areas.
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val T = new ArrayBuffer[Triangle]
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triangulate(points.toArray, endPoints, T)
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// Update advancing front
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aFront -= (first, node.prev, T.first)
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// Update neighbors
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updateNeighbors(nTriangles, T)
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edgeNeighbors(nTriangles, T)
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// Mark constrained edge
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T.first mark(edge.p, edge.q)
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@ -322,14 +325,14 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
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} else {
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// Mark constrained edge
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firstTriangle mark(edge.p, edge.q)
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triangle
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triangle
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}
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}
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// Update neigbor pointers for edge event
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// Inneficient, but it works well...
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def updateNeighbors(nTriangles: ArrayBuffer[Triangle], T: ArrayBuffer[Triangle]) {
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def edgeNeighbors(nTriangles: ArrayBuffer[Triangle], T: ArrayBuffer[Triangle]) {
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for(t1 <- nTriangles)
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for(t2 <- T)
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@ -443,13 +446,12 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
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private def legalization(t1: Triangle, node: Node): Node = {
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val t2 = node.triangle
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val point = t1.points(0)
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val oPoint = t2 oppositePoint t1
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if(illegal(t1.points(1), oPoint, t1.points(2), t1.points(0))) {
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// Flip edges and rotate everything clockwise
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val point = t1.points(0)
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t1.legalize(oPoint)
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t2.legalize(oPoint, point)
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@ -469,9 +471,9 @@ class CDT(val points: List[Point], val segments: List[Segment], iTriangle: Trian
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} else {
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// Update neighbor
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node.triangle.markNeighbor(t1)
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t2.markNeighbor(t1)
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// Update advancing front
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aFront.insert(t1.points(0), t1, node)
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aFront.insert(point, t1, node)
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}
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