Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/L1Comparator.java @ 1119:7c4f81f74c47

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merged gnv-artifacts
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:14:00 +0200
parents f953c9a559d8
children
rev   line source
1115
f953c9a559d8 Added license file and license headers.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.gnv.math;
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10
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11 import com.vividsolutions.jts.geom.Coordinate;
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12
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13 import java.util.Comparator;
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14
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15 /**
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16 * Compares two coordinates a and b by their L1(Manhattan) distance
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17 * relative to a reference point r.
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18 * da = L1(a, r)<br>
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19 * db = L1(b, r)<br>
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20 * -1 if da &lt; db, +1 if da &gt; db, 0 else.
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21 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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22 */
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23 public class L1Comparator
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24 implements Comparator
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25 {
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26 private Coordinate ref;
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27
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28 /**
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29 * Default constructor.
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30 */
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31 public L1Comparator() {
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32 }
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33
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34 /**
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35 * Constructor to create a L1Comparator with a given reference point.
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36 * @param ref The reference point.
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37 */
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38 public L1Comparator(Coordinate ref) {
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39 this.ref = ref;
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40 }
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41
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42 /**
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43 * Explicitly sets the reference point.
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44 * @param ref The reference point.
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45 */
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46 public void setReference(Coordinate ref) {
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47 this.ref = ref;
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48 }
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49
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50 /**
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51 * Compares to coordinate by their L1 distance to the reference point.
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52 * @param a The first coordinate.
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53 * @param b The second coordinate.
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54 * @return -1 if L1(a, ref) &lt; L1(b, ref),
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55 * +1 if L1(a, ref) &gt; L1(b, ref), 0 else.
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56 */
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57 public int compare(Object a, Object b) {
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58 Coordinate pa = (Coordinate)a;
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59 Coordinate pb = (Coordinate)b;
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60 double da = L1(ref, pa);
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61 double db = L1(ref, pb);
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62 if (da < db) return -1;
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63 if (da > db) return +1;
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64 return 0;
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65 }
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66
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67 /**
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68 * Computes the L1 distance between two points a and b:<br>
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69 * L1(a, b) = abs(a.x - b.x) + abs(a.y - b.y)
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70 * @param a The first point.
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71 * @param b The second point.
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72 * @return The L1 distance.
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73 */
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74 public static double L1(Coordinate a, Coordinate b) {
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75 return Math.abs(a.x - b.x) + Math.abs(a.y - b.y);
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76 }
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77 }
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78 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org