01: /*
02: * The JTS Topology Suite is a collection of Java classes that
03: * implement the fundamental operations required to validate a given
04: * geo-spatial data set to a known topological specification.
05: *
06: * Copyright (C) 2001 Vivid Solutions
07: *
08: * This library is free software; you can redistribute it and/or
09: * modify it under the terms of the GNU Lesser General Public
10: * License as published by the Free Software Foundation; either
11: * version 2.1 of the License, or (at your option) any later version.
12: *
13: * This library is distributed in the hope that it will be useful,
14: * but WITHOUT ANY WARRANTY; without even the implied warranty of
15: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16: * Lesser General Public License for more details.
17: *
18: * You should have received a copy of the GNU Lesser General Public
19: * License along with this library; if not, write to the Free Software
20: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21: *
22: * For more information, contact:
23: *
24: * Vivid Solutions
25: * Suite #1A
26: * 2328 Government Street
27: * Victoria BC V8T 5G5
28: * Canada
29: *
30: * (250)385-6040
31: * www.vividsolutions.com
32: */
33: package com.vividsolutions.jtsexample.linearref;
34:
35: import com.vividsolutions.jts.geom.*;
36: import com.vividsolutions.jts.io.*;
37: import com.vividsolutions.jts.linearref.*;
38:
39: /**
40: * Examples of Linear Referencing
41: *
42: * @version 1.7
43: */
44:
45: public class LinearRefExample {
46:
47: static GeometryFactory fact = new GeometryFactory();
48: static WKTReader rdr = new WKTReader(fact);
49:
50: public static void main(String[] args) throws Exception {
51: LinearRefExample example = new LinearRefExample();
52: example.run();
53: }
54:
55: public LinearRefExample() {
56: }
57:
58: public void run() throws Exception {
59: runExtractedLine("LINESTRING (0 0, 10 10, 20 20)", 1, 10);
60: runExtractedLine(
61: "MULTILINESTRING ((0 0, 10 10), (20 20, 25 25, 30 40))",
62: 1, 20);
63: }
64:
65: public void runExtractedLine(String wkt, double start, double end)
66: throws ParseException {
67: System.out.println("=========================");
68: Geometry g1 = rdr.read(wkt);
69: System.out.println("Input Geometry: " + g1);
70: System.out.println("Indices to extract: " + start + " " + end);
71:
72: LengthIndexedLine indexedLine = new LengthIndexedLine(g1);
73:
74: Geometry subLine = indexedLine.extractLine(start, end);
75: System.out.println("Extracted Line: " + subLine);
76:
77: double[] index = indexedLine.indicesOf(subLine);
78: System.out.println("Indices of extracted line: " + index[0]
79: + " " + index[1]);
80:
81: Coordinate midpt = indexedLine
82: .extractPoint((index[0] + index[1]) / 2);
83: System.out.println("Midpoint of extracted line: " + midpt);
84: }
85: }
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