Poly2Tri.java

/* Poly2Tri
 * Copyright (c) 2009-2010, Poly2Tri Contributors
 * http://code.google.com/p/poly2tri/
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * * 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.
 * * Neither the name of Poly2Tri nor the names of its contributors may be
 *   used to endorse or promote products derived from this software without specific
 *   prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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 THE COPYRIGHT OWNER 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.
 */
package org.poly2tri;

import org.poly2tri.geometry.polygon.Polygon;
import org.poly2tri.geometry.polygon.PolygonSet;
import org.poly2tri.triangulation.Triangulatable;
import org.poly2tri.triangulation.TriangulationAlgorithm;
import org.poly2tri.triangulation.TriangulationContext;
import org.poly2tri.triangulation.TriangulationProcess;
import org.poly2tri.triangulation.delaunay.sweep.DTSweep;
import org.poly2tri.triangulation.delaunay.sweep.DTSweepContext;
import org.poly2tri.triangulation.sets.ConstrainedPointSet;
import org.poly2tri.triangulation.sets.PointSet;
import org.poly2tri.triangulation.util.PolygonGenerator;

public class Poly2Tri {

	private static final TriangulationAlgorithm _defaultAlgorithm = TriangulationAlgorithm.DTSweep;

	public static void triangulate(PolygonSet ps) {
		TriangulationContext<?> tcx = createContext(_defaultAlgorithm);
		for (Polygon p : ps.getPolygons()) {
			tcx.prepareTriangulation(p);
			triangulate(tcx);
			tcx.clear();
		}
	}

	public static void triangulate(Polygon p) {
		triangulate(_defaultAlgorithm, p);
	}

	public static void triangulate(ConstrainedPointSet cps) {
		triangulate(_defaultAlgorithm, cps);
	}

	public static void triangulate(PointSet ps) {
		triangulate(_defaultAlgorithm, ps);
	}

	public static TriangulationContext<?> createContext(
			TriangulationAlgorithm algorithm) {
		switch (algorithm) {
		case DTSweep:
		default:
			return new DTSweepContext();
		}
	}

	public static void triangulate(TriangulationAlgorithm algorithm,
			Triangulatable t) {
		TriangulationContext<?> tcx;

		//        long time = System.nanoTime();
		tcx = createContext(algorithm);
		tcx.prepareTriangulation(t);
		triangulate(tcx);
		//        logger.info( "Triangulation of {} points [{}ms]", tcx.getPoints().size(), ( System.nanoTime() - time ) / 1e6 );
	}

	public static void triangulate(TriangulationContext<?> tcx) {
		switch (tcx.algorithm()) {
		case DTSweep:
		default:
			DTSweep.triangulate((DTSweepContext) tcx);
		}
	}

	/**
	 * Will do a warmup run to let the JVM optimize the triangulation code 
	 */
	public static void warmup() {
		/*
		 * After a method is run 10000 times, the Hotspot compiler will compile
		 * it into native code. Periodically, the Hotspot compiler may recompile
		 * the method. After an unspecified amount of time, then the compilation
		 * system should become quiet.
		 */
		Polygon poly = PolygonGenerator.RandomCircleSweep2(50, 50000);
		TriangulationProcess process = new TriangulationProcess();
		process.triangulate(poly);
	}
}