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.jts.algorithm;
34:
35: import com.vividsolutions.jts.geom.*;
36:
37: /**
38: * Computes a point in the interior of an point geometry.
39: * <h2>Algorithm</h2>
40: * Find a point which is closest to the centroid of the geometry.
41: *
42: * @version 1.7
43: */
44: public class InteriorPointPoint {
45:
46: private Coordinate centroid;
47: private double minDistance = Double.MAX_VALUE;
48:
49: private Coordinate interiorPoint = null;
50:
51: public InteriorPointPoint(Geometry g) {
52: centroid = g.getCentroid().getCoordinate();
53: add(g);
54: }
55:
56: /**
57: * Tests the point(s) defined by a Geometry for the best inside point.
58: * If a Geometry is not of dimension 0 it is not tested.
59: * @param geom the geometry to add
60: */
61: private void add(Geometry geom) {
62: if (geom instanceof Point) {
63: add(geom.getCoordinate());
64: } else if (geom instanceof GeometryCollection) {
65: GeometryCollection gc = (GeometryCollection) geom;
66: for (int i = 0; i < gc.getNumGeometries(); i++) {
67: add(gc.getGeometryN(i));
68: }
69: }
70: }
71:
72: private void add(Coordinate point) {
73: double dist = point.distance(centroid);
74: if (dist < minDistance) {
75: interiorPoint = new Coordinate(point);
76: minDistance = dist;
77: }
78: }
79:
80: public Coordinate getInteriorPoint() {
81: return interiorPoint;
82: }
83: }
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