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| 2 |
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| 3 | /*
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| 4 | * The JCS Conflation Suite (JCS) is a library of Java classes that
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| 5 | * can be used to build automated or semi-automated conflation solutions.
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| 6 | *
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| 7 | * Copyright (C) 2003 Vivid Solutions
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| 8 | *
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| 9 | * This program is free software; you can redistribute it and/or
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| 10 | * modify it under the terms of the GNU General Public License
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| 11 | * as published by the Free Software Foundation; either version 2
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| 12 | * of the License, or (at your option) any later version.
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| 13 | *
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| 14 | * This program is distributed in the hope that it will be useful,
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 17 | * GNU General Public License for more details.
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| 18 | *
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| 19 | * You should have received a copy of the GNU General Public License
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| 20 | * along with this program; if not, write to the Free Software
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| 21 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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| 22 | *
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| 23 | * For more information, contact:
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| 24 | *
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| 25 | * Vivid Solutions
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| 26 | * Suite #1A
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| 27 | * 2328 Government Street
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| 28 | * Victoria BC V8T 5G5
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| 29 | * Canada
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| 30 | *
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| 31 | * (250)385-6040
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| 32 | * www.vividsolutions.com
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| 33 | */
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| 34 |
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| 35 | package com.vividsolutions.jcs.conflate.polygonmatch;
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| 36 |
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| 37 | import com.vividsolutions.jts.geom.Geometry;
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| 38 |
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| 39 | /**
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| 40 | * Uses symmetric difference as the criterion for determining match scores.
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| 41 | */
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| 42 | public class SymDiffMatcher extends IndependentCandidateMatcher {
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| 43 |
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| 44 | public SymDiffMatcher() {
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| 45 | }
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| 46 |
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| 47 | /**
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| 48 | * The score is a linear function of the symmetric difference: 1 if the shapes perfectly
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| 49 | * overlap; 0 if the shapes do not overlap at all.
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| 50 | * @param target the feature to match
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| 51 | * @param candidate the feature to compare with the target
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| 52 | * @return candidates with a score greater than 0 (typically all the candidates).
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| 53 | */
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| 54 | public double match(Geometry target, Geometry candidate) {
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| 55 | Geometry targetGeom = (Geometry) target.clone();
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| 56 | Geometry candidateGeom = (Geometry) candidate.clone();
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| 57 | if (targetGeom.isEmpty() || candidateGeom.isEmpty()) {
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| 58 | return 0; //avoid div by 0 in centre-of-mass calc [Jon Aquino]
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| 59 | }
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| 60 | return MatcherUtil.toScoreFromSymDiffArea(
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| 61 | targetGeom.getArea(), candidateGeom.getArea(),
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| 62 | targetGeom.symDifference(candidateGeom).getArea());
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| 63 | }
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| 64 | }
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