Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/L1Comparator.java @ 1113:e7efbded1367
Summarized changes for RELEASE 1.1
gnv-artifacts/trunk@1251 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Wed, 30 Jun 2010 12:26:04 +0000 |
parents | a645bd23c1c8 |
children | f953c9a559d8 |
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1 package de.intevation.gnv.math; |
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2 |
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3 import com.vividsolutions.jts.geom.Coordinate; |
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4 |
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5 import java.util.Comparator; |
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6 |
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7 /** |
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8 * Compares two coordinates a and b by their L1(Manhattan) distance |
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9 * relative to a reference point r. |
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10 * da = L1(a, r)<br> |
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11 * db = L1(b, r)<br> |
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12 * -1 if da < db, +1 if da > db, 0 else. |
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13 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> |
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14 */ |
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15 public class L1Comparator |
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16 implements Comparator |
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17 { |
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18 private Coordinate ref; |
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19 |
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20 /** |
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21 * Default constructor. |
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22 */ |
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23 public L1Comparator() { |
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24 } |
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25 |
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26 /** |
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27 * Constructor to create a L1Comparator with a given reference point. |
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28 * @param ref The reference point. |
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29 */ |
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30 public L1Comparator(Coordinate ref) { |
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31 this.ref = ref; |
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32 } |
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33 |
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34 /** |
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35 * Explicitly sets the reference point. |
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36 * @param ref The reference point. |
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37 */ |
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38 public void setReference(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 * Compares to coordinate by their L1 distance to the reference point. |
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44 * @param a The first coordinate. |
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45 * @param b The second coordinate. |
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46 * @return -1 if L1(a, ref) < L1(b, ref), |
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47 * +1 if L1(a, ref) > L1(b, ref), 0 else. |
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48 */ |
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49 public int compare(Object a, Object b) { |
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50 Coordinate pa = (Coordinate)a; |
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51 Coordinate pb = (Coordinate)b; |
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52 double da = L1(ref, pa); |
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53 double db = L1(ref, pb); |
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54 if (da < db) return -1; |
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55 if (da > db) return +1; |
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56 return 0; |
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57 } |
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58 |
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59 /** |
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60 * Computes the L1 distance between two points a and b:<br> |
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61 * L1(a, b) = abs(a.x - b.x) + abs(a.y - b.y) |
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62 * @param a The first point. |
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63 * @param b The second point. |
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64 * @return The L1 distance. |
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65 */ |
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66 public static double L1(Coordinate a, Coordinate b) { |
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67 return Math.abs(a.x - b.x) + Math.abs(a.y - b.y); |
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68 } |
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69 } |
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70 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |