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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 jogamp.graph.curve.tess;
import java.util.ArrayList;
import java.util.List;
import com.jogamp.graph.curve.tess.Triangulator;
import com.jogamp.graph.geom.Outline;
import com.jogamp.graph.geom.Triangle;
import com.jogamp.graph.geom.Vertex;
import com.jogamp.graph.geom.plane.Winding;
import com.jogamp.opengl.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 implements Triangulator {
protected static final boolean DEBUG = Debug.debug("graph.curve.Triangulation");
private static final boolean TEST_LINE_AA = Debug.debug("graph.curve.triangulation.LINE_AA");
private static final boolean TEST_MARK_LINE = Debug.debug("graph.curve.triangulation.MARK_AA");
private static final boolean TEST_ENABLED = TEST_LINE_AA || TEST_MARK_LINE;
private final ArrayList<Loop> loops = new ArrayList<Loop>();
private int addedVerticeCount;
private int maxTriID;
/** Constructor for a new Delaunay triangulator
*/
public CDTriangulator2D() {
reset();
}
@Override
public final void reset() {
maxTriID = 0;
addedVerticeCount = 0;
loops.clear();
}
@Override
public final int getAddedVerticeCount() {
return addedVerticeCount;
}
@Override
public final void addCurve(final List<Triangle> sink, final Outline polyline, final float sharpness) {
Loop loop = null;
if(!loops.isEmpty()) {
loop = getContainerLoop(polyline);
}
if(loop == null) {
final GraphOutline outline = new GraphOutline(polyline);
final GraphOutline innerPoly = extractBoundaryTriangles(sink, outline, false, sharpness);
// vertices.addAll(polyline.getVertices());
loop = new Loop(innerPoly, Winding.CCW);
loops.add(loop);
} else {
final GraphOutline outline = new GraphOutline(polyline);
final GraphOutline innerPoly = extractBoundaryTriangles(sink, outline, true, sharpness);
// vertices.addAll(innerPoly.getVertices());
loop.addConstraintCurve(innerPoly);
}
}
@Override
public final void generate(final List<Triangle> sink) {
final int loopsSize = loops.size();
for(int i=0;i<loopsSize;i++) {
final Loop loop = loops.get(i);
int numTries = 0;
int size = loop.computeLoopSize();
while(!loop.isSimplex()){
final Triangle tri;
if(numTries > size){
tri = loop.cut(false);
}
else{
tri = loop.cut(true);
}
numTries++;
if(tri != null) {
numTries = 0;
size--;
tri.setId(maxTriID++);
sink.add(tri);
if(DEBUG){
System.err.println("CDTri.gen["+i+"].0: "+tri);
}
}
if(numTries > size*2){
if(DEBUG){
System.err.println("CDTri.gen["+i+"].X: Triangulation not complete!");
}
break;
}
}
final Triangle tri = loop.cut(true);
if(tri != null) {
sink.add(tri);
if(DEBUG){
System.err.println("CDTri.gen["+i+"].1: "+tri);
}
}
}
if( TEST_ENABLED ) {
final float[] tempV2 = new float[2];
final CDTriangulator2DExpAddOn addOn = new CDTriangulator2DExpAddOn();
final int sinkSize = sink.size();
if( TEST_MARK_LINE ) {
for(int i=0; i<sinkSize; i++) {
final Triangle t0 = sink.get(i);
addOn.markLineInTriangle(t0, tempV2);
}
} else if ( TEST_LINE_AA ){
for(int i=0; i<sinkSize-1; i+=2) {
final Triangle t0 = sink.get(i);
final Triangle t1 = sink.get(i+1);
/* final float[] rect = */ addOn.processLineAA(i, t0, t1, tempV2);
}
}
}
}
private GraphOutline extractBoundaryTriangles(final List<Triangle> sink, final GraphOutline outline, final boolean hole, final float sharpness) {
final GraphOutline innerOutline = new GraphOutline();
final ArrayList<GraphVertex> outVertices = outline.getGraphPoint();
final int size = outVertices.size();
for(int i=0; i < size; i++) {
final GraphVertex gv1 = outVertices.get(i); // currentVertex
final GraphVertex gv0 = outVertices.get((i+size-1)%size); // -1
final GraphVertex gv2 = outVertices.get((i+1)%size); // +1
if( !gv1.getPoint().isOnCurve() ) {
final Vertex v0 = gv0.getPoint().clone();
final Vertex v2 = gv2.getPoint().clone();
final Vertex v1 = gv1.getPoint().clone();
addedVerticeCount += 3;
final boolean[] boundaryVertices = { true, true, true };
gv0.setBoundaryContained(true);
gv1.setBoundaryContained(true);
gv2.setBoundaryContained(true);
final Triangle t;
final boolean holeLike;
if(VectorUtil.ccw(v0,v1,v2)) {
holeLike = false;
t = new Triangle(v0, v1, v2, boundaryVertices);
} else {
holeLike = true;
t = new Triangle(v2, v1, v0, boundaryVertices);
}
t.setId(maxTriID++);
sink.add(t);
if(DEBUG){
System.err.println(t);
}
if( hole || holeLike ) {
v0.setTexCoord(0.0f, -0.1f, 0f);
v2.setTexCoord(1.0f, -0.1f, 0f);
v1.setTexCoord(0.5f, -sharpness-0.1f, 0f);
innerOutline.addVertex(gv1);
} else {
v0.setTexCoord(0.0f, 0.1f, 0f);
v2.setTexCoord(1.0f, 0.1f, 0f);
v1.setTexCoord(0.5f, sharpness+0.1f, 0f);
}
if(DEBUG) {
System.err.println("CDTri.ebt["+i+"].0: hole "+(hole || holeLike)+" "+gv1+", "+t);
}
} else {
if( !gv2.getPoint().isOnCurve() || !gv0.getPoint().isOnCurve() ) {
gv1.setBoundaryContained(true);
}
innerOutline.addVertex(gv1);
if(DEBUG) {
System.err.println("CDTri.ebt["+i+"].1: "+gv1);
}
}
}
return innerOutline;
}
private Loop getContainerLoop(final Outline polyline) {
final ArrayList<Vertex> vertices = polyline.getVertices();
for(int i=0; i < loops.size(); i++) {
final Loop loop = loops.get(i);
for(int j=0; j < vertices.size(); j++) {
if( loop.checkInside( vertices.get(j) ) ) {
return loop;
}
}
}
return null;
}
}
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