/* * 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.jtsexample.linearref; import com.vividsolutions.jts.geom.*; import com.vividsolutions.jts.io.*; import com.vividsolutions.jts.linearref.*; /** * Examples of Linear Referencing * * @version 1.7 */ public class LinearRefExample { static GeometryFactory fact = new GeometryFactory(); static WKTReader rdr = new WKTReader(fact); public static void main(String[] args) throws Exception { LinearRefExample example = new LinearRefExample(); example.run(); } public LinearRefExample() { } public void run() throws Exception { runExtractedLine("LINESTRING (0 0, 10 10, 20 20)", 1, 10); runExtractedLine("MULTILINESTRING ((0 0, 10 10), (20 20, 25 25, 30 40))", 1, 20); } public void runExtractedLine(String wkt, double start, double end) throws ParseException { System.out.println("========================="); Geometry g1 = rdr.read(wkt); System.out.println("Input Geometry: " + g1); System.out.println("Indices to extract: " + start + " " + end); LengthIndexedLine indexedLine = new LengthIndexedLine(g1); Geometry subLine = indexedLine.extractLine(start, end); System.out.println("Extracted Line: " + subLine); double[] index = indexedLine.indicesOf(subLine); System.out.println("Indices of extracted line: " + index[0] + " " + index[1]); Coordinate midpt = indexedLine.extractPoint((index[0] + index[1]) / 2); System.out.println("Midpoint of extracted line: " + midpt); } }