Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/WKmsOperation.java @ 3927:208a891c21b5
Partly fix issue871.
flys-artifacts/trunk@5619 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Thu, 27 Sep 2012 13:25:51 +0000 |
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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 /** |
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52 * Subtract two series from each other, interpolate values |
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53 * missing in one series in the other. |
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54 */ |
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55 public static WKms subtract(WKms minuend, WKms subtrahend) { |
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56 |
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57 int M = minuend .size(); |
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58 int S = subtrahend.size(); |
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59 |
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60 // Don't subtract empty sets |
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61 if (M < 1 || S < 1) { |
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62 return new WKmsImpl(); |
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63 } |
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64 |
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65 KmW [] ms = new KmW[M]; |
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66 KmW [] ss = new KmW[S]; |
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67 |
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68 for (int i = 0; i < M; ++i) { |
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69 ms[i] = new KmW(minuend.getKm(i), minuend.getW(i)); |
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70 } |
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71 |
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72 for (int i = 0; i < S; ++i) { |
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73 ss[i] = new KmW(subtrahend.getKm(i), subtrahend.getW(i)); |
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74 } |
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75 |
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76 Arrays.sort(ms); |
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77 Arrays.sort(ss); |
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78 |
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79 // no overlap -> empty result set |
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80 if (ms[0].km > ss[S-1].km || ss[0].km > ms[M-1].km) { |
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81 return new WKmsImpl(); |
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82 } |
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83 |
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84 WKmsImpl result = new WKmsImpl(); |
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85 |
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86 int mi = 0; |
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87 int si = 0; |
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88 |
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89 OUT: while (mi < M && si < S) { |
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90 KmW m = ms[mi]; |
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91 KmW s = ss[si]; |
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92 |
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93 if (m.km + EPSILON < s.km) { |
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94 // minuend is before subtrahend |
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95 |
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96 while (ms[mi].km + EPSILON < s.km) { |
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97 if (++mi >= M) { |
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98 break OUT; |
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99 } |
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100 } |
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101 |
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102 if (ms[mi].km + EPSILON > s.km) { |
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103 double mw = Linear.linear( |
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104 s.km, |
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105 ms[mi-1].km, ms[mi].km, |
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106 ms[mi-1].w, ms[mi].w); |
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107 result.add(s.km, mw - s.w); |
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108 ++si; |
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109 } |
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110 else { // s.km == ms[mi].km |
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111 result.add(s.km, ms[mi].subtract(s)); |
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112 ++mi; |
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113 ++si; |
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114 } |
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115 } |
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116 else if (m.km > s.km + EPSILON) { |
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117 // subtrahend is before minuend |
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118 |
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119 while (m.km > ss[si].km + EPSILON) { |
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120 if (++si >= S) { |
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121 break OUT; |
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122 } |
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123 } |
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124 |
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125 if (ss[si].km + EPSILON > m.km) { |
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126 double sw = Linear.linear( |
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127 m.km, |
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128 ss[si-1].km, ss[si].km, |
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129 ss[si-1].w, ss[si].w); |
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130 result.add(m.km, m.w - sw); |
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131 } |
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132 else { // ss[si].km == m.km |
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133 result.add(m.km, m.subtract(ss[si])); |
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134 ++mi; |
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135 ++si; |
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136 } |
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137 } |
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138 else { // m.km == s.km |
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139 result.add(s.km, m.subtract(s)); |
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140 ++mi; |
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141 ++si; |
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142 } |
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143 } |
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144 |
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145 return result; |
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146 } |
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147 } |
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148 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 : |