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convex test
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@ -44,6 +44,8 @@ class MonotoneMountain {
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// Triangles that constitute the mountain
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val triangles = new ArrayBuffer[Array[Point]]
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var slop = 0.0f
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// Append a point to the list
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def +=(point: Point) {
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size match {
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@ -92,7 +94,7 @@ class MonotoneMountain {
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val ear = convexPoints.dequeue
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val a = ear.prev.clone
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val b = ear
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val b = ear.clone
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val c = ear.next.clone
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val triangle = Array(a, b, c)
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triangles += triangle
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@ -103,6 +105,11 @@ class MonotoneMountain {
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if(c.prev != null && convex(c)) convexPoints.enqueue(c)
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}
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if(size >= 4) {
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println("Size = " + size)
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println(convex(head.next) + ", Angle: " + slop)
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println(convex(head.next.next) + ", Angle: " + slop)
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}
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assert(size <= 3, "Triangulation bug")
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if(size == 3)lastTriangle
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}
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@ -119,19 +126,11 @@ class MonotoneMountain {
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// Determines if the inslide angle between edge v2-v3 and edge v2-v1 is convex
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private def convex(p: Point) = {
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val a = (p.next - p)
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val b = (p.prev - p)
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var angle = Math.atan2(b.y,b.x) - Math.atan2(a.y,a.x)
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if(angle < 0) while(angle < -Math.Pi) angle += Math.Pi
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if(angle > 0) while(angle > Math.Pi) angle -= Math.Pi
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// For numerical robustness....
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angle = 0.1 * Math.round( angle * 10.0)
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val cvx = (angle < 0)
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if(p.y >= head.y) {
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cvx
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} else {
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!cvx
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}
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val a = (p.next - p).normalize
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val b = (p.prev - p).normalize
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slop = a dot b
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slop = 0.1f * Math.round( slop * 10.0f)
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(slop >= 0f || slop == -1f || slop == 1f)
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}
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private def lastTriangle {
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@ -44,6 +44,10 @@ class Point(val x: Float, val y: Float, var segment: Segment) {
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def +(p: Point) = new Point(x + p.x, y + p.y)
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def +(f: Float) = new Point(x + f, y + f)
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def *(f: Float) = new Point(x * f, y * f)
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def /(a: Float) = new Point(x / a, y / a)
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def dot(p: Point) = x * p.x + y * p.y
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def length = Math.sqrt(x * x + y * y).toFloat
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def normalize = this / length
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def <(p: Point) = {
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if(p.x == x)
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@ -85,8 +85,8 @@ class Poly2TriDemo extends BasicGame("Poly2Tri") {
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}
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val lCirc = new Circle(t.leftPoint.x, t.leftPoint.y, 4)
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g.setColor(blue); g.draw(lCirc); g.fill(lCirc)
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val rCirc = new Circle(t.rightPoint.x, t.rightPoint.y, 6)
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//g.setColor(yellow); g.draw(rCirc); g.fill(rCirc)
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val rCirc = new Circle(t.rightPoint.x, t.rightPoint.y, 4)
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g.setColor(yellow); g.draw(rCirc); g.fill(rCirc)
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g.setColor(red)
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g.draw(polygon)
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}
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@ -95,6 +95,7 @@ class Poly2TriDemo extends BasicGame("Poly2Tri") {
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if(!debug) {
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var i = 0
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for(t <- tesselator.triangles) {
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if(t.size < 3) println("wtf")
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val triangle = new Polygon
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t.foreach(p => triangle.addPoint(p.x, p.y))
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val color = if(i == hiLighter) blue else red
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