Application: gvSIG desktop

/*

 * Created on 05-sep-2007

 *

 * gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

 *

 * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 *  Generalitat Valenciana

 *   Conselleria d'Infraestructures i Transport

 *   Av. Blasco Ib??ez, 50

 *   46010 VALENCIA

 *   SPAIN

 *

 *      +34 963862235

 *   gvsig@gva.es

 *      www.gvsig.gva.es

 *

 *    or

 *

 *   IVER T.I. S.A

 *   Salamanca 50

 *   46005 Valencia

 *   Spain

 *

 *   +34 963163400

 *   dac@iver.es

 */

/* CVS MESSAGES:

*

* $Id: GeometrySnapperTest.java 14152 2007-09-27 19:12:46Z azabala $

* $Log: GeometrySnapperTest.java,v $

* Revision 1.2  2007/09/10 14:42:13  azabala

* *** empty log message ***

*

* Revision 1.1  2007/09/06 16:32:02  azabala

* *** empty log message ***

*

*

*/

package org.gvsig.topology;

import java.util.ArrayList;

import org.gvsig.jts.GeometrySnapper;

import com.vividsolutions.jts.geom.Coordinate;

import com.vividsolutions.jts.geom.Geometry;

import com.vividsolutions.jts.geom.GeometryFactory;

import com.vividsolutions.jts.geom.LineString;

import com.vividsolutions.jts.io.ParseException;

import com.vividsolutions.jts.io.WKTReader;

import junit.framework.TestCase;

public class GeometrySnapperTest extends TestCase {

        GeometryFactory factory = new GeometryFactory();

        WKTReader wktReader = new WKTReader(factory);

        public void tearDown() throws Exception{

                super.tearDown();

                factory = null;

                wktReader = null;

                System.gc();

        }

        public void testAverageSnap1(){

                Coordinate coord1 = new Coordinate(0, 0);

                Coordinate coord2 = new Coordinate(100, 100);

                Coordinate coord3 = new Coordinate(200, 200);

                ArrayList coords = new ArrayList();

                coords.add(coord1);

                coords.add(coord2);

                coords.add(coord3);

                int[] weights = {1,1,1};//all coordinates with the same weight

                GeometrySnapper snapper = new GeometrySnapper(0.1d);

                Coordinate averageCoord = snapper.snapAverage(coords, weights);

                assertTrue(averageCoord.x == (0 + 100 + 200)/3);

                int[] weights2 = {1,2,2, 1};//first coordinate with double weight

                coords.add(new Coordinate(0.5, 1.27));

                averageCoord = snapper.snapAverage(coords, weights2);

                //snapped point is nearest to the coord with higher weight

                assertTrue(coord1.distance(averageCoord) < coord3.distance(averageCoord));

        }

        public void testSnapManyGeometries() throws ParseException{

                String linestring1 = "LINESTRING (280 80, 380 240, 620 360, 820 220, 600 140, 560 240, 420 180)";

                String linestring2 = "LINESTRING (280.001 79.999, 420.21 179.999)";

                LineString geo1 = (LineString) wktReader.read(linestring1);

                LineString geo2 = (LineString) wktReader.read(linestring2);

                GeometrySnapper snapper = new GeometrySnapper(0.6);

                LineString[] geometries = {geo1, geo2};

                int[] weights = {1,0};

                Geometry[] snappedGeometries = snapper.snap(geometries, weights);

                for(int i = 0; i < snappedGeometries.length; i++){

                        System.out.println(snappedGeometries[i].toText());

                }

                LineString geo2orig = (LineString) wktReader.read(linestring2);

                assertTrue(!geo2orig.equals(geo1));

        }

}