/*
* Copyright (c) 2016 Vivid Solutions.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Eclipse Distribution License v. 1.0 which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
*
* http://www.eclipse.org/org/documents/edl-v10.php.
*/
package org.locationtech.jts.triangulate;
import org.locationtech.jts.geom.Geometry;
import org.locationtech.jts.geom.GeometryFactory;
import org.locationtech.jts.io.ParseException;
import org.locationtech.jts.io.WKTReader;
import junit.framework.TestCase;
import junit.textui.TestRunner;
/**
* Tests Delaunay Triangulation classes
*
*/
public class DelaunayTest extends TestCase {
public static void main(String args[]) {
TestRunner.run(DelaunayTest.class);
}
private GeometryFactory geomFact = new GeometryFactory();
private WKTReader reader = new WKTReader();
public DelaunayTest(String name) { super(name); }
public void testTriangle()
throws ParseException
{
String wkt = "MULTIPOINT ((10 10 1), (10 20 2), (20 20 3))";
String expected = "MULTILINESTRING ((10 20, 20 20), (10 10, 10 20), (10 10, 20 20))";
runDelaunayEdges(wkt, expected);
String expectedTri = "GEOMETRYCOLLECTION (POLYGON ((10 20, 10 10, 20 20, 10 20)))";
runDelaunay(wkt, true, expectedTri);
}
public void testRandom()
throws ParseException
{
String wkt = "MULTIPOINT ((50 40), (140 70), (80 100), (130 140), (30 150), (70 180), (190 110), (120 20))";
String expected = "MULTILINESTRING ((70 180, 190 110), (30 150, 70 180), (30 150, 50 40), (50 40, 120 20), (190 110, 120 20), (120 20, 140 70), (190 110, 140 70), (130 140, 140 70), (130 140, 190 110), (70 180, 130 140), (80 100, 130 140), (70 180, 80 100), (30 150, 80 100), (50 40, 80 100), (80 100, 120 20), (80 100, 140 70))";
runDelaunayEdges(wkt, expected);
String expectedTri = "GEOMETRYCOLLECTION (POLYGON ((30 150, 50 40, 80 100, 30 150)), POLYGON ((30 150, 80 100, 70 180, 30 150)), POLYGON ((70 180, 80 100, 130 140, 70 180)), POLYGON ((70 180, 130 140, 190 110, 70 180)), POLYGON ((190 110, 130 140, 140 70, 190 110)), POLYGON ((190 110, 140 70, 120 20, 190 110)), POLYGON ((120 20, 140 70, 80 100, 120 20)), POLYGON ((120 20, 80 100, 50 40, 120 20)), POLYGON ((80 100, 140 70, 130 140, 80 100)))";
runDelaunay(wkt, true, expectedTri);
}
public void testGrid()
throws ParseException
{
String wkt = "MULTIPOINT ((10 10), (10 20), (20 20), (20 10), (20 0), (10 0), (0 0), (0 10), (0 20))";
String expected = "MULTILINESTRING ((10 20, 20 20), (0 20, 10 20), (0 10, 0 20), (0 0, 0 10), (0 0, 10 0), (10 0, 20 0), (20 0, 20 10), (20 10, 20 20), (10 20, 20 10), (10 10, 20 10), (10 10, 10 20), (10 10, 0 20), (10 10, 0 10), (10 0, 10 10), (0 10, 10 0), (10 10, 20 0))";
runDelaunayEdges(wkt, expected);
String expectedTri = "GEOMETRYCOLLECTION (POLYGON ((0 20, 0 10, 10 10, 0 20)), POLYGON ((0 20, 10 10, 10 20, 0 20)), POLYGON ((10 20, 10 10, 20 10, 10 20)), POLYGON ((10 20, 20 10, 20 20, 10 20)), POLYGON ((10 0, 20 0, 10 10, 10 0)), POLYGON ((10 0, 10 10, 0 10, 10 0)), POLYGON ((10 0, 0 10, 0 0, 10 0)), POLYGON ((10 10, 20 0, 20 10, 10 10)))";
runDelaunay(wkt, true, expectedTri);
}
public void testCircle()
throws ParseException
{
String wkt = "POLYGON ((42 30, 41.96 29.61, 41.85 29.23, 41.66 28.89, 41.41 28.59, 41.11 28.34, 40.77 28.15, 40.39 28.04, 40 28, 39.61 28.04, 39.23 28.15, 38.89 28.34, 38.59 28.59, 38.34 28.89, 38.15 29.23, 38.04 29.61, 38 30, 38.04 30.39, 38.15 30.77, 38.34 31.11, 38.59 31.41, 38.89 31.66, 39.23 31.85, 39.61 31.96, 40 32, 40.39 31.96, 40.77 31.85, 41.11 31.66, 41.41 31.41, 41.66 31.11, 41.85 30.77, 41.96 30.39, 42 30))";
String expected = "MULTILINESTRING ((41.66 31.11, 41.85 30.77), (41.41 31.41, 41.66 31.11), (41.11 31.66, 41.41 31.41), (40.77 31.85, 41.11 31.66), (40.39 31.96, 40.77 31.85), (40 32, 40.39 31.96), (39.61 31.96, 40 32), (39.23 31.85, 39.61 31.96), (38.89 31.66, 39.23 31.85), (38.59 31.41, 38.89 31.66), (38.34 31.11, 38.59 31.41), (38.15 30.77, 38.34 31.11), (38.04 30.39, 38.15 30.77), (38 30, 38.04 30.39), (38 30, 38.04 29.61), (38.04 29.61, 38.15 29.23), (38.15 29.23, 38.34 28.89), (38.34 28.89, 38.59 28.59), (38.59 28.59, 38.89 28.34), (38.89 28.34, 39.23 28.15), (39.23 28.15, 39.61 28.04), (39.61 28.04, 40 28), (40 28, 40.39 28.04), (40.39 28.04, 40.77 28.15), (40.77 28.15, 41.11 28.34), (41.11 28.34, 41.41 28.59), (41.41 28.59, 41.66 28.89), (41.66 28.89, 41.85 29.23), (41.85 29.23, 41.96 29.61), (41.96 29.61, 42 30), (41.96 30.39, 42 30), (41.85 30.77, 41.96 30.39), (41.66 31.11, 41.96 30.39), (41.41 31.41, 41.96 30.39), (41.41 28.59, 41.96 30.39), (41.41 28.59, 41.41 31.41), (38.59 28.59, 41.41 28.59), (38.59 28.59, 41.41 31.41), (38.59 28.59, 38.59 31.41), (38.59 31.41, 41.41 31.41), (38.59 31.41, 39.61 31.96), (39.61 31.96, 41.41 31.41), (39.61 31.96, 40.39 31.96), (40.39 31.96, 41.41 31.41), (40.39 31.96, 41.11 31.66), (38.04 30.39, 38.59 28.59), (38.04 30.39, 38.59 31.41), (38.04 30.39, 38.34 31.11), (38.04 29.61, 38.59 28.59), (38.04 29.61, 38.04 30.39), (39.61 28.04, 41.41 28.59), (38.59 28.59, 39.61 28.04), (38.89 28.34, 39.61 28.04), (40.39 28.04, 41.41 28.59), (39.61 28.04, 40.39 28.04), (41.96 29.61, 41.96 30.39), (41.41 28.59, 41.96 29.61), (41.66 28.89, 41.96 29.61), (40.39 28.04, 41.11 28.34), (38.04 29.61, 38.34 28.89), (38.89 31.66, 39.61 31.96))";
runDelaunayEdges(wkt, expected);
}
public void testPolygonWithChevronHoles()
throws ParseException
{
String wkt = "POLYGON ((0 0, 0 200, 180 200, 180 0, 0 0), (20 180, 160 180, 160 20, 152.625 146.75, 20 180), (30 160, 150 30, 70 90, 30 160))";
String expected = "MULTILINESTRING ((0 200, 180 200), (0 0, 0 200), (0 0, 180 0), (180 200, 180 0), (152.625 146.75, 180 0), (152.625 146.75, 180 200), (152.625 146.75, 160 180), (160 180, 180 200), (0 200, 160 180), (20 180, 160 180), (0 200, 20 180), (20 180, 30 160), (30 160, 0 200), (0 0, 30 160), (30 160, 70 90), (0 0, 70 90), (70 90, 150 30), (150 30, 0 0), (150 30, 160 20), (0 0, 160 20), (160 20, 180 0), (152.625 146.75, 160 20), (150 30, 152.625 146.75), (70 90, 152.625 146.75), (30 160, 152.625 146.75), (30 160, 160 180))";
runDelaunayEdges(wkt, expected);
}
static final double COMPARISON_TOLERANCE = 1.0e-7;
void runDelaunayEdges(String sitesWKT, String expectedWKT)
throws ParseException
{
runDelaunay(sitesWKT, false, expectedWKT);
}
void runDelaunay(String sitesWKT, boolean computeTriangles, String expectedWKT)
throws ParseException
{
Geometry sites = reader.read(sitesWKT);
DelaunayTriangulationBuilder builder = new DelaunayTriangulationBuilder();
builder.setSites(sites);
Geometry result = null;
if (computeTriangles) {
result = builder.getTriangles(geomFact);
}
else {
result = builder.getEdges(geomFact);
}
//System.out.println(result);
Geometry expected = reader.read(expectedWKT);
result.normalize();
expected.normalize();
assertTrue(expected.equalsExact(result, COMPARISON_TOLERANCE));
}
}