/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2008, Open Source Geospatial Foundation (OSGeo)
*
* 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;
* version 2.1 of the License.
*
* 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.
*/
package org.geotools.geometry.jts.spatialschema.geometry;
import org.opengis.referencing.FactoryException;
import org.opengis.geometry.DirectPosition;
import org.opengis.geometry.TransfiniteSet;
import org.opengis.geometry.primitive.Curve;
import org.opengis.geometry.primitive.SurfaceBoundary;
import org.opengis.geometry.primitive.Surface;
/**
* @author Jody Garnett
* @author Joel Skelton
*
*
*
*
* @source $URL$
*/
public class IntersectionTest extends AbstractGeometryTest {
/**
* Prepare the test environment
*/
public void setUp() throws FactoryException {
super.setUp();
}
/**
* test the simple intersection of two polygons
*/
public void testSimpleIntersection() {
DirectPosition[] pointsA = new DirectPosition[4];
pointsA[0] = createDirectPosition(0.0, 0.0);
pointsA[1] = createDirectPosition(1.0, 0.0);
pointsA[2] = createDirectPosition(0.0, 1.0);
pointsA[3] = createDirectPosition(0.0, 0.0);
DirectPosition[] pointsB = new DirectPosition[4];
pointsB[0] = createDirectPosition(0.0, 0.0);
pointsB[1] = createDirectPosition(1.0, 0.0);
pointsB[2] = createDirectPosition(1.0, 1.0);
pointsB[3] = createDirectPosition(0.0, 0.0);
Surface sA = createSurface(pointsA);
assertEquals(0.5, sA.getArea(), 1.0e-8);
assertEquals(1.0 + 1.0 + Math.sqrt(2.0), sA.getPerimeter(), 0.0);
Surface sB = createSurface(pointsB);
assertEquals(0.5, sB.getArea(), 1.0e-8);
assertEquals(1.0 + 1.0 + Math.sqrt(2.0), sB.getPerimeter(), 0.0);
TransfiniteSet result = sA.intersection(sB);
assertTrue(result instanceof Surface);
Surface surfaceResult = (Surface)result;
assertEquals(1.0 + Math.sqrt(2.0), surfaceResult.getPerimeter(), 0.0);
}
public void testEdgeIntersection() {
DirectPosition[] pointsA = new DirectPosition[4];
pointsA[0] = createDirectPosition(0.0, 0.0);
pointsA[1] = createDirectPosition(1.0, 0.0);
pointsA[2] = createDirectPosition(0.0, 1.0);
pointsA[3] = createDirectPosition(0.0, 0.0);
DirectPosition[] pointsB = new DirectPosition[4];
pointsB[0] = createDirectPosition(1.0, 0.0);
pointsB[1] = createDirectPosition(1.0, 1.0);
pointsB[2] = createDirectPosition(0.0, 1.0);
pointsB[3] = createDirectPosition(1.0, 0.0);
Surface sA = createSurface(pointsA);
assertEquals(0.5, sA.getArea(), 1.0e-8);
assertEquals(1.0 + 1.0 + Math.sqrt(2.0), sA.getPerimeter(), 0.0);
Surface sB = createSurface(pointsB);
assertEquals(0.5, sB.getArea(), 1.0e-8);
assertEquals(1.0 + 1.0 + Math.sqrt(2.0), sB.getPerimeter(), 0.0);
TransfiniteSet result = sA.intersection(sB);
assertTrue(result instanceof Curve);
Curve curveResult = (Curve)result;
assertEquals(0.0, curveResult.getStartParam(), 1.0e-8);
assertEquals(Math.sqrt(2.0), curveResult.getEndParam(), 1.0e-8);
}
}