Mercurial > dive4elements > river

annotate backend/src/main/java/org/dive4elements/river/importer/XY.java @ 7730:e1b831fe435a slt-simplify-cross-sections

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Merged default into slt-simplify-cross-sections branch and updated package and class names.
author Tom Gottfried <tom@intevation.de>
date Mon, 20 Jan 2014 14:04:20 +0100
parents flys-backend/src/main/java/de/intevation/flys/importer/XY.java@7bbee0cfc171 flys-backend/src/main/java/de/intevation/flys/importer/XY.java@4c3ccf2b0304
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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7 */
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8
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9 package org.dive4elements.river.importer;
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10
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11
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12 /** Two doubles and an int index. */
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13 public class XY
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14 implements Comparable<XY>
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15 {
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16 public static final double X_EPSILON = 1e-4;
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17
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18 protected double x;
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19 protected double y;
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20 protected int index;
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21
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22 public XY() {
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23 }
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24
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25 public XY(XY other) {
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26 this(other.x, other.y, other.index);
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27 }
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28
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29 public XY(double x, double y, int index) {
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30 this.x = x;
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31 this.y = y;
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32 this.index = index;
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33 }
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34
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35 @Override
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36 public int compareTo(XY other) {
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37 if (x + X_EPSILON < other.x) return -1;
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38 if (x > other.x + X_EPSILON) return +1;
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39 if (index < other.index) return -1;
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40 if (index > other.index) return +1;
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41 return 0;
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42 }
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43
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44 public double getX() {
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45 return x;
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46 }
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47
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48 public void setX(double x) {
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49 this.x = x;
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50 }
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51
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52 public double getY() {
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53 return y;
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54 }
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55
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56 public void setY(double y) {
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57 this.y = y;
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58 }
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59
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60 public int getIndex() {
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61 return index;
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62 }
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63
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64 public void setIndex(int index) {
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65 this.index = index;
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66 }
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67
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68 public double dot(double ox, double oy) {
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69 return x*ox + y*oy;
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70 }
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71
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72 public double dot(XY other) {
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73 return dot(other.x, other.y);
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74 }
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75
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76 public XY sub(XY other) {
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77 x -= other.x;
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78 y -= other.y;
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79 return this;
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80 }
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81
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82 public XY ortho() {
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83 double z = x;
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84 x = y;
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85 y = -z;
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86 return this;
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87 }
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88
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89 public XY normalize() {
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90 double len = dot(this);
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91
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92 if (len > 1e-6) {
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93 len = 1d/Math.sqrt(len);
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94 x *= len;
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95 y *= len;
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96 }
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97
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98 return this;
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99 }
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100
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101 // x*nx + y*ny + d = 0 <=> d = -x*nx -y*ny
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102 public double lineOffset(XY p) {
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103 return -x*p.x -y*p.y;
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104 }
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105 }
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106 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org