Source Code Cross Referenced for VertexHausdorffDistance.java in  » GIS » openjump » com » vividsolutions » jump » algorithm » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » openjump » com.vividsolutions.jump.algorithm 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * The Unified Mapping Platform (JUMP) is an extensible, interactive GUI
003:         * for visualizing and manipulating spatial features with geometry and attributes.
004:         *
005:         * Copyright (C) 2003 Vivid Solutions
006:         *
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License
009:         * as published by the Free Software Foundation; either version 2
010:         * of the License, or (at your option) any later version.
011:         *
012:         * This program is distributed in the hope that it will be useful,
013:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
015:         * GNU General Public License for more details.
016:         *
017:         * You should have received a copy of the GNU General Public License
018:         * along with this program; if not, write to the Free Software
019:         * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
020:         *
021:         * For more information, contact:
022:         *
023:         * Vivid Solutions
024:         * Suite #1A
025:         * 2328 Government Street
026:         * Victoria BC  V8T 5G5
027:         * Canada
028:         *
029:         * (250)385-6040
030:         * www.vividsolutions.com
031:         */
032:
033:        package com.vividsolutions.jump.algorithm;
034:
035:        import com.vividsolutions.jts.geom.*;
036:        import com.vividsolutions.jump.geom.LineSegmentUtil;
037:
038:        /**
039:         * Implements algorithm for computing a distance metric
040:         * which can be thought of as the "Vertex Hausdorff Distance".
041:         * This is the Hausdorff distance restricted to vertices for
042:         * one of the geometries.
043:         * Also computes two points of the Geometries which are separated by the computed distance.
044:         * <p>
045:         * <b>NOTE: This algorithm does NOT compute the full Hausdorff distance correctly, but
046:         * an approximation that is correct for a large subset of useful cases.
047:         * One important part of this subset is Linestrings that are roughly parallel to each other,
048:         * and roughly equal in length - just what is needed for line matching.
049:         * </b>
050:         */
051:        public class VertexHausdorffDistance {
052:
053:            public static double distance(Geometry g0, Geometry g1) {
054:                VertexHausdorffDistance vhd = new VertexHausdorffDistance(g0,
055:                        g1);
056:                return vhd.distance();
057:            }
058:
059:            private PointPairDistance ptDist = new PointPairDistance();
060:
061:            public VertexHausdorffDistance(Geometry g0, Geometry g1) {
062:                compute(g0, g1);
063:            }
064:
065:            public VertexHausdorffDistance(LineSegment seg0, LineSegment seg1) {
066:                compute(seg0, seg1);
067:            }
068:
069:            public double distance() {
070:                return ptDist.getDistance();
071:            }
072:
073:            public Coordinate[] getCoordinates() {
074:                return ptDist.getCoordinates();
075:            }
076:
077:            private void compute(LineSegment seg0, LineSegment seg1) {
078:                computeMaxPointDistance(seg0, seg1, ptDist);
079:                computeMaxPointDistance(seg1, seg0, ptDist);
080:            }
081:
082:            /**
083:             * Computes the maximum oriented distance between two line segments,
084:             * as well as the point pair separated by that distance.
085:             *
086:             * @param seg0 the line segment containing the furthest point
087:             * @param seg1 the line segment containing the closest point
088:             * @param ptDist the point pair and distance to be updated
089:             */
090:            private void computeMaxPointDistance(LineSegment seg0,
091:                    LineSegment seg1, PointPairDistance ptDist) {
092:                Coordinate closestPt0 = seg0.closestPoint(seg1.p0);
093:                ptDist.setMaximum(closestPt0, seg1.p0);
094:                Coordinate closestPt1 = seg0.closestPoint(seg1.p1);
095:                ptDist.setMaximum(closestPt1, seg1.p1);
096:            }
097:
098:            private void compute(Geometry g0, Geometry g1) {
099:                computeMaxPointDistance(g0, g1, ptDist);
100:                computeMaxPointDistance(g1, g0, ptDist);
101:            }
102:
103:            private void computeMaxPointDistance(Geometry pointGeom,
104:                    Geometry geom, PointPairDistance ptDist) {
105:                MaxPointDistanceFilter distFilter = new MaxPointDistanceFilter(
106:                        geom);
107:                pointGeom.apply(distFilter);
108:                ptDist.setMaximum(distFilter.getMaxPointDistance());
109:            }
110:
111:            public static class MaxPointDistanceFilter implements 
112:                    CoordinateFilter {
113:                private PointPairDistance maxPtDist = new PointPairDistance();
114:                private PointPairDistance minPtDist = new PointPairDistance();
115:                private EuclideanDistanceToPoint euclideanDist = new EuclideanDistanceToPoint();
116:                private Geometry geom;
117:
118:                public MaxPointDistanceFilter(Geometry geom) {
119:                    this .geom = geom;
120:                }
121:
122:                public void filter(Coordinate pt) {
123:                    minPtDist.initialize();
124:                    euclideanDist.computeDistance(geom, pt, minPtDist);
125:                    maxPtDist.setMaximum(minPtDist);
126:                }
127:
128:                public PointPairDistance getMaxPointDistance() {
129:                    return maxPtDist;
130:                }
131:            }
132:        }
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