Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/WKmsOperation.java @ 1025:02c327ffbad7

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Datacage: Extended schema for artifacts and collections to have creation times, too. flys-artifacts/trunk@2484 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 10 Aug 2011 14:57:12 +0000
parents 0cb1a70b8b92
children 302461d5d071
rev   line source
925
0cb1a70b8b92 Added the math needed to calculate "W-Differenzen" in "Laengsschnitten"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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1 package de.intevation.flys.artifacts.math;
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2
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3 import de.intevation.flys.artifacts.model.WKms;
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4 import de.intevation.flys.artifacts.model.WKmsImpl;
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5
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6 import java.util.Arrays;
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7
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8 public abstract class WKmsOperation
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9 {
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10 public static final double EPSILON = 1e-6;
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11
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12 public static final class KmW
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13 implements Comparable<KmW>
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14 {
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15 protected double km;
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16 protected double w;
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17
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18 public KmW(double km, double w) {
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19 this.km = km;
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20 this.w = w;
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21 }
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22
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23 public int compareTo(KmW other) {
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24 return km < other.km
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25 ? -1
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26 : km > other.km ? +1 : 0;
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27 }
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28
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29 public boolean kmEquals(KmW other) {
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30 return Math.abs(km - other.km) < EPSILON;
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31 }
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32
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33 public double subtract(KmW other) {
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34 return w - other.w;
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35 }
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36 } // class KmW
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37
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38 public static final WKmsOperation SUBTRACTION = new WKmsOperation() {
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39
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40 @Override
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41 public WKms operate(WKms a, WKms b) {
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42 return subtract(a, b);
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43 }
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44 };
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45
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46 protected WKmsOperation() {
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47 }
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48
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49 public abstract WKms operate(WKms a, WKms b);
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50
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51 public static WKms subtract(WKms minuend, WKms subtrahend) {
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52
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53 int M = minuend .size();
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54 int S = subtrahend.size();
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55
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56 // Don't subtract empty sets
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57 if (M < 1 || S < 1) {
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58 return new WKmsImpl();
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59 }
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60
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61 KmW [] ms = new KmW[M];
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62 KmW [] ss = new KmW[S];
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63
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64 for (int i = 0; i < M; ++i) {
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65 ms[i] = new KmW(minuend.getKm(i), minuend.getW(i));
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66 }
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67
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68 for (int i = 0; i < S; ++i) {
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69 ss[i] = new KmW(subtrahend.getKm(i), subtrahend.getW(i));
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70 }
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71
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72 Arrays.sort(ms);
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73 Arrays.sort(ss);
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74
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75 // no overlap -> empty result set
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76 if (ms[0].km > ss[S-1].km || ss[0].km > ms[M-1].km) {
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77 return new WKmsImpl();
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78 }
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79
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80 WKmsImpl result = new WKmsImpl();
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81
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82 int mi = 0;
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83 int si = 0;
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84
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85 OUT: while (mi < M && si < S) {
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86 KmW m = ms[mi];
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87 KmW s = ss[si];
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88
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89 if (m.km + EPSILON < s.km) {
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90 // minuend is before subtrahend
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91
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92 while (ms[mi].km + EPSILON < s.km) {
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93 if (++mi >= M) {
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94 break OUT;
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95 }
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96 }
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97
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98 if (ms[mi].km + EPSILON > s.km) {
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99 double mw = Linear.linear(
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100 s.km,
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101 ms[mi-1].km, ms[mi].km,
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102 ms[mi-1].w, ms[mi].w);
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103 result.add(s.km, mw - s.w);
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104 ++si;
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105 }
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106 else { // s.km == ms[mi].km
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107 result.add(s.km, ms[mi].subtract(s));
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108 ++mi;
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109 ++si;
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110 }
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111 }
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112 else if (m.km > s.km + EPSILON) {
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113 // subtrahend is before minuend
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114
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115 while (m.km > ss[si].km + EPSILON) {
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116 if (++si >= S) {
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117 break OUT;
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118 }
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119 }
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120
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121 if (ss[si].km + EPSILON > m.km) {
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122 double sw = Linear.linear(
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123 m.km,
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124 ss[si-1].km, ss[si].km,
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125 ss[si-1].w, ss[si].w);
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126 result.add(m.km, m.w - sw);
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127 }
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128 else { // ss[si].km == m.km
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129 result.add(m.km, m.subtract(ss[si]));
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130 ++mi;
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131 ++si;
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132 }
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133 }
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134 else { // m.km == s.km
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135 result.add(s.km, m.subtract(s));
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136 ++mi;
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137 ++si;
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138 }
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139 }
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140
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141 return result;
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142 }
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143 }
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144 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org