/* * 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.geom.prep; import java.util.*; import com.vividsolutions.jts.geom.*; import com.vividsolutions.jts.noding.*; /** * Computes the <tt>intersects</tt> spatial relationship predicate * for {@link PreparedPolygon}s relative to all other {@link Geometry} classes. * Uses short-circuit tests and indexing to improve performance. * * @author Martin Davis * */ class PreparedPolygonIntersects extends PreparedPolygonPredicate { /** * Computes the intersects predicate between a {@link PreparedPolygon} * and a {@link Geometry}. * * @param prep the prepared polygon * @param geom a test geometry * @return true if the polygon intersects the geometry */ public static boolean intersects(PreparedPolygon prep, Geometry geom) { PreparedPolygonIntersects polyInt = new PreparedPolygonIntersects(prep); return polyInt.intersects(geom); } /** * Creates an instance of this operation. * * @param prepPoly the PreparedPolygon to evaluate */ public PreparedPolygonIntersects(PreparedPolygon prepPoly) { super(prepPoly); } /** * Tests whether this PreparedPolygon intersects a given geometry. * * @param geom the test geometry * @return true if the test geometry intersects */ public boolean intersects(Geometry geom) { /** * Do point-in-poly tests first, since they are cheaper and may result * in a quick positive result. * * If a point of any test components lie in target, result is true */ boolean isInPrepGeomArea = isAnyTestComponentInTarget(geom); if (isInPrepGeomArea) return true; /** * If any segments intersect, result is true */ List lineSegStr = SegmentStringUtil.extractSegmentStrings(geom); // only request intersection finder if there are segments (ie NOT for point inputs) if (lineSegStr.size() > 0) { boolean segsIntersect = prepPoly.getIntersectionFinder().intersects(lineSegStr); if (segsIntersect) return true; } /** * If the test has dimension = 2 as well, it is necessary to * test for proper inclusion of the target. * Since no segments intersect, it is sufficient to test representative points. */ if (geom.getDimension() == 2) { // TODO: generalize this to handle GeometryCollections boolean isPrepGeomInArea = isAnyTargetComponentInAreaTest(geom, prepPoly.getRepresentativePoints()); if (isPrepGeomInArea) return true; } return false; } }