Folded turtle2d into jogl folders

1 files changed, 216 insertions, 0 deletions

diff --git a/src/jogl/classes/com/jogamp/graph/curve/tess/CDTriangulator2D.java b/src/jogl/classes/com/jogamp/graph/curve/tess/CDTriangulator2D.java
new file mode 100644
index 000000000..a2e4ca50f
--- /dev/null
+++ b/src/jogl/classes/com/jogamp/graph/curve/tess/CDTriangulator2D.java
@@ -0,0 +1,216 @@
+/**
+ * Copyright 2010 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ *
+ *    2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *       of conditions and the following disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+
+package com.jogamp.graph.curve.tess;
+
+import java.util.ArrayList;
+
+import jogamp.graph.curve.tess.GraphOutline;
+import jogamp.graph.curve.tess.GraphVertex;
+import jogamp.graph.curve.tess.Loop;
+
+import com.jogamp.graph.geom.Outline;
+import com.jogamp.graph.geom.Triangle;
+import com.jogamp.graph.geom.Vertex;
+import com.jogamp.graph.math.VectorUtil;
+
+import jogamp.opengl.Debug;
+
+/** Constrained Delaunay Triangulation 
+ * implementation of a list of Outlines that define a set of
+ * Closed Regions with optional n holes.
+ * 
+ */
+public class CDTriangulator2D {
+
+	protected static final boolean DEBUG = Debug.debug("Triangulation");
+	
+	private float sharpness = 0.5f;
+	private ArrayList<Loop> loops;
+	private ArrayList<Vertex> vertices;
+	
+	private ArrayList<Triangle> triangles;
+	private int maxTriID = 0;
+
+	
+	public CDTriangulator2D() {
+		this(0.5f);
+	}
+	
+	/** Constructor for a new Delaunay triangulator
+	 * @param curveSharpness the curvature around
+	 *  the off-curve vertices
+	 */
+	public CDTriangulator2D(float curveSharpness) {
+		this.sharpness = curveSharpness;
+		reset();
+	}
+	
+	/** Reset the triangulation to initial state
+	 *  Clearing cached data
+	 */
+	public void reset() {
+		maxTriID = 0;
+		vertices = new ArrayList<Vertex>();
+		triangles = new ArrayList<Triangle>(3);
+		loops = new ArrayList<Loop>();
+	}
+	
+	/** Add a curve to the list of profiles provided
+	 * @param polyline a bounding {@link Outline}
+	 */
+	public void addCurve(Outline polyline){
+		Loop loop = null;
+		
+		if(!loops.isEmpty()){
+			loop = getContainerLoop(polyline);
+		}
+		
+		if(loop == null) {
+			GraphOutline outline = new GraphOutline(polyline);
+			GraphOutline innerPoly = extractBoundaryTriangles(outline, false);
+			vertices.addAll(polyline.getVertices());
+			loop = new Loop(innerPoly, VectorUtil.CCW);
+			loops.add(loop);
+		}
+		else {
+			GraphOutline outline = new GraphOutline(polyline);
+			GraphOutline innerPoly = extractBoundaryTriangles(outline, true);
+			vertices.addAll(innerPoly.getPoints());
+			loop.addConstraintCurve(innerPoly);
+		}
+	}
+	
+	/** Generate the triangulation of the provided 
+	 *  List of {@link Outline}s
+	 */
+	public ArrayList<Triangle> generateTriangulation(){	
+		for(int i=0;i<loops.size();i++) {
+			Loop loop = loops.get(i);
+			int numTries = 0;
+			int size = loop.computeLoopSize();
+			while(!loop.isSimplex()){
+				Triangle tri = null;
+				if(numTries > size){
+					tri = loop.cut(false);
+				}
+				else{
+					tri = loop.cut(true);
+				}
+				numTries++;
+
+				if(tri != null) {
+					numTries = 0;
+					size--;
+					tri.setId(maxTriID++);
+					triangles.add(tri);
+					if(DEBUG){
+						System.err.println(tri);
+					}
+				}
+				if(numTries > size*2){
+					if(DEBUG){
+						System.err.println("Triangulation not complete!");
+					}
+					break;
+				}
+			}
+			Triangle tri = loop.cut(true);
+			if(tri != null)
+				triangles.add(tri);
+		}
+		return triangles;
+	}
+
+	private GraphOutline extractBoundaryTriangles(GraphOutline outline, boolean hole){
+		GraphOutline innerOutline = new GraphOutline();
+		ArrayList<GraphVertex> outVertices = outline.getGraphPoint();
+		int size = outVertices.size();
+		for(int i=0; i < size; i++) {
+			GraphVertex currentVertex = outVertices.get(i);
+			GraphVertex gv0 = outVertices.get((i+size-1)%size);
+			GraphVertex gv2 = outVertices.get((i+1)%size);
+			GraphVertex gv1 = currentVertex;
+			
+			if(!currentVertex.getPoint().isOnCurve()) {
+			    Vertex v0 = gv0.getPoint().clone();
+			    Vertex v2 = gv2.getPoint().clone();
+			    Vertex v1 = gv1.getPoint().clone();
+				
+				gv0.setBoundaryContained(true);
+				gv1.setBoundaryContained(true);
+				gv2.setBoundaryContained(true);
+				
+				Triangle t= null;
+				boolean holeLike = false;
+				if(VectorUtil.ccw(v0,v1,v2)){
+					t = new Triangle(v0, v1, v2);
+				}
+				else {
+					holeLike = true;
+					t = new Triangle(v2, v1, v0);
+				}
+				t.setId(maxTriID++);
+				triangles.add(t);
+				if(DEBUG){
+					System.err.println(t);
+				}
+				if(hole || holeLike) {
+					v0.setTexCoord(0, -0.1f);
+					v2.setTexCoord(1, -0.1f);
+					v1.setTexCoord(0.5f, -1*sharpness -0.1f);
+					innerOutline.addVertex(currentVertex);
+				}
+				else {
+					v0.setTexCoord(0, 0.1f);
+					v2.setTexCoord(1, 0.1f);
+					v1.setTexCoord(0.5f, sharpness+0.1f);
+				}
+			}
+			else {
+				if(!gv2.getPoint().isOnCurve() || !gv0.getPoint().isOnCurve()){
+					currentVertex.setBoundaryContained(true);
+				}
+				innerOutline.addVertex(currentVertex);
+			}
+		}
+		return innerOutline;
+	}
+	
+	private Loop getContainerLoop(Outline polyline){
+	    ArrayList<Vertex> vertices = polyline.getVertices();
+	    for(Vertex vert: vertices){
+			for (Loop loop:loops){
+				if(loop.checkInside(vert)){
+					return loop;
+				}
+			}
+	    }
+		return null;
+	}
+}