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/**
* 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.GraphPoint;
import jogamp.graph.curve.tess.Loop;
import jogamp.graph.math.VectorFloatUtil;
import com.jogamp.graph.geom.Outline;
import com.jogamp.graph.geom.Triangle;
import com.jogamp.graph.geom.PointTex;
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 <T extends PointTex> {
protected static final boolean DEBUG = Debug.debug("Triangulation");
private float sharpness = 0.5f;
private ArrayList<Loop<T>> loops;
private ArrayList<T> vertices;
private ArrayList<Triangle<T>> 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<T>();
triangles = new ArrayList<Triangle<T>>(3);
loops = new ArrayList<Loop<T>>();
}
/** Add a curve to the list of profiles provided
* @param polyline a bounding Outline
*/
public void addCurve(Outline<T> polyline){
Loop<T> loop = null;
if(!loops.isEmpty()){
loop = getContainerLoop(polyline);
}
if(loop == null) {
GraphOutline<T> outline = new GraphOutline<T>(polyline);
GraphOutline<T> innerPoly = extractBoundaryTriangles(outline, false);
vertices.addAll(polyline.getVertices());
loop = new Loop<T>(innerPoly, VectorFloatUtil.CCW);
loops.add(loop);
}
else {
GraphOutline<T> outline = new GraphOutline<T>(polyline);
GraphOutline<T> innerPoly = extractBoundaryTriangles(outline, true);
vertices.addAll(innerPoly.getPoints());
loop.addConstraintCurve(innerPoly);
}
}
/** Generate the triangulation of the provided
* List of Outlines
*/
public ArrayList<Triangle<T>> generateTriangulation(){
for(int i=0;i<loops.size();i++) {
Loop<T> loop = loops.get(i);
int numTries = 0;
int size = loop.computeLoopSize();
while(!loop.isSimplex()){
Triangle<T> 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<T> tri = loop.cut(true);
if(tri != null)
triangles.add(tri);
}
return triangles;
}
@SuppressWarnings("unchecked")
private GraphOutline<T> extractBoundaryTriangles(GraphOutline<T> outline, boolean hole){
GraphOutline<T> innerOutline = new GraphOutline<T>();
ArrayList<GraphPoint<T>> outVertices = outline.getGraphPoint();
int size = outVertices.size();
for(int i=0; i < size; i++) {
GraphPoint<T> currentVertex = outVertices.get(i);
GraphPoint<T> gv0 = outVertices.get((i+size-1)%size);
GraphPoint<T> gv2 = outVertices.get((i+1)%size);
GraphPoint<T> gv1 = currentVertex;
if(!currentVertex.getPoint().isOnCurve()) {
T v0 = (T) gv0.getPoint().clone();
T v2 = (T) gv2.getPoint().clone();
T v1 = (T) gv1.getPoint().clone();
gv0.setBoundaryContained(true);
gv1.setBoundaryContained(true);
gv2.setBoundaryContained(true);
Triangle<T> t= null;
boolean holeLike = false;
if(VectorFloatUtil.ccw(v0,v1,v2)){
t = new Triangle<T>(v0, v1, v2);
}
else {
holeLike = true;
t = new Triangle<T>(v2, v1, v0);
}
t.setId(maxTriID++);
triangles.add(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<T> getContainerLoop(Outline<T> polyline){
T v = polyline.getVertex(0);
for (Loop<T> loop:loops){
if(loop.checkInside(v)){
return loop;
}
}
return null;
}
}
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