Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/Point2d.java @ 474:ab29e4ff2fda

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Added area interpolation needed for "Horizontalschnitt" gnv-artifacts/trunk@540 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 14 Jan 2010 10:34:05 +0000
parents 422275fc9927
children b248531fa20b
rev   line source
361
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1 package de.intevation.gnv.math;
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2
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3 import java.util.Comparator;
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4
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5 import com.vividsolutions.jts.geom.Envelope;
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6 import com.vividsolutions.jts.geom.Coordinate;
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7
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8 /**
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9 * @author Sascha L. Teichmann
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10 */
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11 public class Point2d
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12 extends Coordinate
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13 {
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14 public static final double EPSILON = 1e-3d;
361
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15
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16 public static final Comparator X_COMPARATOR = new Comparator() {
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17 public int compare(Object a, Object b) {
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18 double xa = ((Coordinate)a).x;
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19 double xb = ((Coordinate)b).x;
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20 if (xa < xb) return -1;
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21 if (xa > xb) return +1;
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22 return 0;
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23 }
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24 };
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25
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26 public static final Comparator Y_COMPARATOR = new Comparator() {
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27 public int compare(Object a, Object b) {
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28 double ya = ((Coordinate)a).y;
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29 double yb = ((Coordinate)b).y;
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30 if (ya < yb) return -1;
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31 if (ya > yb) return +1;
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32 return 0;
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33 }
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34 };
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35
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36 public static class InverseL1Comparator
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37 implements Comparator
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38 {
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39 private Point2d ref;
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40
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41 public InverseL1Comparator(Point2d ref) {
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42 this.ref = ref;
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43 }
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44
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45 public int compare(Object a, Object b) {
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46 Point2d pa = (Point2d)a;
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47 Point2d pb = (Point2d)b;
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48 double da = ref.L1(pa);
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49 double db = ref.L1(pb);
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50 if (da < db) return -1;
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51 if (da > db) return +1;
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52 return 0;
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53 }
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54 } // class InverseL1Comparator
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55
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56 public int i;
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57 public int j;
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58
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59 public Point2d() {
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60 }
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61
431
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62 public Point2d(double x, double y, int i, int j) {
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63 super(x, y);
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64 this.i = i;
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65 this.j = j;
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66 }
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67
361
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68 public Point2d(double x, double y, double z, int i, int j) {
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69 super(x, y, z);
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70 this.i = i;
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71 this.j = j;
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72 }
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73
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74
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75 public double L1(Point2d other) {
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76 return L1(this, other);
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77 }
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78
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79 public static double L1(Coordinate a, Coordinate b) {
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80 return Math.abs(a.x - b.x) + Math.abs(a.y - b.y);
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81 }
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82
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83 public Envelope envelope() {
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84 return envelope(EPSILON);
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85 }
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86
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87 public Envelope envelope(double epsilon) {
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88 return new Envelope(
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89 x-epsilon, x+epsilon,
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90 y-epsilon, y+epsilon);
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91 }
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92
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93 public boolean hasIGap(Point2d other) {
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94 return Math.abs(i - other.i) > 1;
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95 }
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96
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97 public boolean hasJGap(Point2d other) {
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98 return Math.abs(j - other.j) > 1;
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99 }
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100 }
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101 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org