com.vividsolutions.jts.triangulate.quadedge.QuadEdgeUtil Maven / Gradle / Ivy

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/*
 * The JTS Topology Suite is a collection of Java classes that
 * implement the fundamental operations required to validate a given
 * geo-spatial data set to a known topological specification.
 *
 * Copyright (C) 2001 Vivid Solutions
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * For more information, contact:
 *
 *     Vivid Solutions
 *     Suite #1A
 *     2328 Government Street
 *     Victoria BC  V8T 5G5
 *     Canada
 *
 *     (250)385-6040
 *     www.vividsolutions.com
 */

package com.vividsolutions.jts.triangulate.quadedge;

import java.util.ArrayList;
import java.util.List;

import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.io.ParseException;
import com.vividsolutions.jts.io.WKTReader;

/**
 * Utilities for working with {@link QuadEdge}s.
 * 
 * @author mbdavis
 * 
 */
public class QuadEdgeUtil 
{
	/**
	 * Gets all edges which are incident on the origin of the given edge.
	 * 
	 * @param start
	 *          the edge to start at
	 * @return a List of edges which have their origin at the origin of the given
	 *         edge
	 */
	public static List findEdgesIncidentOnOrigin(QuadEdge start) {
		List incEdge = new ArrayList();

		QuadEdge qe = start;
		do {
			incEdge.add(qe);
			qe = qe.oNext();
		} while (qe != start);

		return incEdge;
	}

}