Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/math/WKmsOperation.java @ 5863:4897a58c8746

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River artifacts: Added new copyright headers.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 28 Apr 2013 14:40:59 +0200
parents 5aa05a7a34b7
children af13ceeba52a
rev   line source
5863
4897a58c8746 River artifacts: Added new copyright headers.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 5838
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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Sascha L. Teichmann <teichmann@intevation.de>
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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.artifacts.math;
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10
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11 import org.dive4elements.river.artifacts.model.WKms;
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12 import org.dive4elements.river.artifacts.model.WKmsImpl;
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13
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14 import java.util.Arrays;
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15
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16 public abstract class WKmsOperation
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17 {
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18 public static final double EPSILON = 1e-6;
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19
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20 public static final class KmW
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21 implements Comparable<KmW>
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22 {
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23 protected double km;
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24 protected double w;
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25
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26 public KmW(double km, double w) {
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27 this.km = km;
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28 this.w = w;
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29 }
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30
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31 public int compareTo(KmW other) {
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32 return km < other.km
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33 ? -1
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34 : km > other.km ? +1 : 0;
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35 }
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36
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37 public boolean kmEquals(KmW other) {
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38 return Math.abs(km - other.km) < EPSILON;
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39 }
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40
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41 public double subtract(KmW other) {
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42 return w - other.w;
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43 }
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44 } // class KmW
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45
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46 public static final WKmsOperation SUBTRACTION = new WKmsOperation() {
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47
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48 @Override
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49 public WKms operate(WKms a, WKms b) {
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50 return subtract(a, b);
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51 }
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52 };
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53
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54 protected WKmsOperation() {
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55 }
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56
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57 public abstract WKms operate(WKms a, WKms b);
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58
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59 /**
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60 * Subtract two series from each other, interpolate values
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61 * missing in one series in the other.
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62 */
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63 public static WKms subtract(WKms minuend, WKms subtrahend) {
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64
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65 int M = minuend .size();
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66 int S = subtrahend.size();
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67
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68 // Don't subtract empty sets
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69 if (M < 1 || S < 1) {
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70 return new WKmsImpl();
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71 }
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72
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73 KmW [] ms = new KmW[M];
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74 KmW [] ss = new KmW[S];
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75
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76 for (int i = 0; i < M; ++i) {
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77 ms[i] = new KmW(minuend.getKm(i), minuend.getW(i));
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78 }
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79
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80 for (int i = 0; i < S; ++i) {
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81 ss[i] = new KmW(subtrahend.getKm(i), subtrahend.getW(i));
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82 }
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83
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84 Arrays.sort(ms);
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85 Arrays.sort(ss);
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86
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87 // no overlap -> empty result set
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88 if (ms[0].km > ss[S-1].km || ss[0].km > ms[M-1].km) {
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89 return new WKmsImpl();
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90 }
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92 WKmsImpl result = new WKmsImpl();
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93
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94 int mi = 0;
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95 int si = 0;
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96
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97 OUT: while (mi < M && si < S) {
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98 KmW m = ms[mi];
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99 KmW s = ss[si];
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100
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101 if (m.km + EPSILON < s.km) {
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102 // minuend is before subtrahend
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103
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104 while (ms[mi].km + EPSILON < s.km) {
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105 if (++mi >= M) {
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106 break OUT;
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107 }
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108 }
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110 if (ms[mi].km + EPSILON > s.km) {
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parents:
diff changeset
111 double mw = Linear.linear(
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parents:
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112 s.km,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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113 ms[mi-1].km, ms[mi].km,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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114 ms[mi-1].w, ms[mi].w);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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115 result.add(s.km, mw - s.w);
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parents:
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116 ++si;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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117 }
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parents:
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118 else { // s.km == ms[mi].km
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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119 result.add(s.km, ms[mi].subtract(s));
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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120 ++mi;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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121 ++si;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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122 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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123 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
124 else if (m.km > s.km + EPSILON) {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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125 // subtrahend is before minuend
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parents:
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126
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
127 while (m.km > ss[si].km + EPSILON) {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
128 if (++si >= S) {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
129 break OUT;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
130 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
131 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
132
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parents:
diff changeset
133 if (ss[si].km + EPSILON > m.km) {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
134 double sw = Linear.linear(
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parents:
diff changeset
135 m.km,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
136 ss[si-1].km, ss[si].km,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
137 ss[si-1].w, ss[si].w);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
138 result.add(m.km, m.w - sw);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
139 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
140 else { // ss[si].km == m.km
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
141 result.add(m.km, m.subtract(ss[si]));
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
142 ++mi;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
143 ++si;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
144 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
145 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
146 else { // m.km == s.km
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
147 result.add(s.km, m.subtract(s));
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
148 ++mi;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
149 ++si;
0cb1a70b8b92 Added the math needed to calculate "W-Differenzen" in "Laengsschnitten"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
150 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
151 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
152
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
153 return result;
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parents:
diff changeset
154 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
155 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
156 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org