Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/BackJumpCorrector.java @ 1072:80aecb01d79a
Let MainValuesArtifact have a state, outputmode and facet.
flys-artifacts/trunk@2556 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Wed, 24 Aug 2011 12:07:33 +0000 |
parents | c09c9e05ecfa |
children | 0b6dac664bbb |
rev | line source |
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Implementation of the "Ruecksprungkorrektur" to be done in "W fuer angepassten Abflusslaengschnitt".
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1 package de.intevation.flys.artifacts.math; |
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Implementation of the "Ruecksprungkorrektur" to be done in "W fuer angepassten Abflusslaengschnitt".
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parents:
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2 |
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Implementation of the "Ruecksprungkorrektur" to be done in "W fuer angepassten Abflusslaengschnitt".
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3 import java.util.ArrayList; |
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4 import java.util.List; |
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Implementation of the "Ruecksprungkorrektur" to be done in "W fuer angepassten Abflusslaengschnitt".
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parents:
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5 |
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6 import java.io.Serializable; |
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7 |
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Implementation of the "Ruecksprungkorrektur" to be done in "W fuer angepassten Abflusslaengschnitt".
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8 import org.apache.commons.math.analysis.interpolation.SplineInterpolator; |
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9 |
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Implementation of the "Ruecksprungkorrektur" to be done in "W fuer angepassten Abflusslaengschnitt".
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10 import org.apache.commons.math.analysis.polynomials.PolynomialSplineFunction; |
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11 |
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12 import org.apache.commons.math.ArgumentOutsideDomainException; |
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13 |
649
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14 import org.apache.commons.math.exception.MathIllegalArgumentException; |
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15 |
343
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16 import org.apache.log4j.Logger; |
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17 |
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18 import de.intevation.flys.artifacts.model.Calculation; |
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19 |
343
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20 public class BackJumpCorrector |
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21 implements Serializable |
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22 { |
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Implementation of the "Ruecksprungkorrektur" to be done in "W fuer angepassten Abflusslaengschnitt".
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23 private static Logger log = Logger.getLogger(BackJumpCorrector.class); |
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24 |
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25 protected ArrayList<Double> backjumps; |
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26 |
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Implementation of the "Ruecksprungkorrektur" to be done in "W fuer angepassten Abflusslaengschnitt".
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27 protected double [] corrected; |
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28 |
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29 public BackJumpCorrector() { |
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30 backjumps = new ArrayList<Double>(); |
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Implementation of the "Ruecksprungkorrektur" to be done in "W fuer angepassten Abflusslaengschnitt".
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parents:
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31 } |
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parents:
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32 |
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33 public boolean hasBackJumps() { |
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34 return !backjumps.isEmpty(); |
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35 } |
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36 |
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37 public List<Double> getBackJumps() { |
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38 return backjumps; |
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39 } |
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40 |
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41 public double [] getCorrected() { |
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42 return corrected; |
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43 } |
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Implementation of the "Ruecksprungkorrektur" to be done in "W fuer angepassten Abflusslaengschnitt".
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parents:
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44 |
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45 public boolean doCorrection( |
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46 double [] km, |
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47 double [] ws, |
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48 Calculation errors |
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49 ) { |
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50 boolean wsUp = isIncreasing(ws); |
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51 |
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52 if (wsUp) { |
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53 km = swapClone(km); |
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54 ws = swapClone(ws); |
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55 } |
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56 |
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57 boolean kmUp = isIncreasing(km); |
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58 |
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59 if (!kmUp) { |
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60 km = sumDiffs(km); |
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61 } |
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62 |
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63 if (log.isDebugEnabled()) { |
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64 log.debug("BackJumpCorrector.doCorrection ------- enter"); |
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65 log.debug(" km increasing: " + isIncreasing(km)); |
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66 log.debug(" ws increasing: " + isIncreasing(ws)); |
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67 log.debug("BackJumpCorrector.doCorrection ------- leave"); |
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68 } |
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69 |
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70 boolean hasBackJumps = doCorrectionClean(km, ws, errors); |
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71 |
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72 if (hasBackJumps && wsUp) { |
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73 // mirror back |
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74 swap(corrected); |
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75 } |
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76 |
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77 return hasBackJumps; |
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78 } |
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79 |
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80 protected boolean doCorrectionClean( |
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81 double [] km, |
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82 double [] ws, |
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83 Calculation errors |
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84 ) { |
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85 int N = km.length; |
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86 |
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87 if (N != ws.length) { |
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88 throw new IllegalArgumentException("km.length != ws.length"); |
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89 } |
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90 |
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91 if (N < 2) { |
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92 return false; |
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93 } |
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94 |
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95 SplineInterpolator interpolator = null; |
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96 |
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97 for (int i = 1; i < N; ++i) { |
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98 if (ws[i] <= ws[i-1]) { |
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99 // no back jump |
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100 continue; |
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101 } |
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102 backjumps.add(km[i]); |
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103 |
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104 if (corrected == null) { |
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105 // lazy cloning |
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106 ws = corrected = (double [])ws.clone(); |
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107 } |
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108 |
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109 int back = i-2; |
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110 double distance = Math.abs(km[i] - km[i-1]); |
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111 double rest = 0.0; |
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112 double ikm = 0.0; |
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113 |
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114 while (back > -1) { |
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115 if (ws[back] < ws[i]) { // under water |
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116 // continue scanning backwards |
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117 distance += Math.abs(km[back+1] - km[back]); |
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118 --back; |
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119 continue; |
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120 } |
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121 if (ws[back] > ws[i]) { // over water |
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122 // need to calculate intersection |
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123 log.debug("intersection case"); |
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124 double m = (km[back+1]-km[back])/(ws[back+1]-ws[back]); |
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125 double b = km[back]-ws[back]*m; |
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126 ikm = m*ws[i] + b; |
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127 distance += Math.abs(ikm - km[back+1]); |
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128 rest = Math.abs(km[back] - ikm); |
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129 } |
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130 else { |
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131 // equals height at ws[back] |
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132 log.debug("exact height match"); |
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133 distance += Math.abs(km[back+1] - km[back]); |
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134 ikm = km[back]; |
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135 } |
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136 break; |
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137 } |
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138 |
649
44175d4720f8
Fix crashes in back jump correction.
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139 if (back <= 0) { |
642
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Re-eanbled the calculation of the backjump correction.
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140 //log.debug("run over left border"); |
343
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141 // fill with same as ws[i] |
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142 for (int j = 0; j < i; ++j) { |
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143 ws[j] = ws[i]; |
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144 } |
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145 continue; |
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146 } |
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147 |
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148 double quarterDistance = 0.25*distance; |
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149 |
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150 // Now further seek back for the max height |
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151 |
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152 double restDistance = Math.max(0.0, quarterDistance - rest); |
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153 --back; |
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154 |
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155 double mkmw = ws[i]; |
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156 double mkm = km[0]; |
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157 |
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158 while (back > -1) { |
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159 double d = Math.abs(km[back+1] - km[back]); |
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160 restDistance -= d; |
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161 if (restDistance > 0.0) { |
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162 --back; |
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163 continue; |
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164 } |
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165 if (restDistance < 0.0) { |
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166 // need to calculate intersection |
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167 if (km[back] == km[back+1]) { // should not happen |
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168 mkm = km[back]; |
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169 mkmw = 0.5*(ws[back] + ws[back+1]); |
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170 } |
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171 else { |
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172 double m = (ws[back+1]-ws[back])/(km[back+1]-km[back]); |
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173 double b = ws[back] - km[back]*m; |
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174 mkm = km[back] + restDistance; |
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175 mkmw = m*mkm + b; |
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176 } |
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177 } |
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178 else { |
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179 // exact match |
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180 mkm = km[back]; |
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181 mkmw = ws[back]; |
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182 } |
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183 break; |
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184 } |
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185 |
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186 double factor = back >= 0 && Math.abs(restDistance) < 1e-4 |
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187 ? 1.0 |
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188 : 1.0 - Math.min(1, Math.max(0, restDistance/quarterDistance)); |
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189 |
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190 double ikmw = factor*0.25*(mkmw-ws[i]) + ws[i]; |
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191 |
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192 double end = ikm + quarterDistance*factor; |
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193 |
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194 double [] x = { mkm, ikm, end }; |
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195 double [] y = { mkmw, ikmw, ws[i] }; |
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196 |
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197 if (interpolator == null) { |
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198 interpolator = new SplineInterpolator(); |
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199 } |
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200 |
642
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201 if (log.isDebugEnabled()) { |
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202 for (int j = 0; j < x.length; ++j) { |
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203 log.debug(" " + x[j] + " -> " + y[j]); |
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204 } |
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205 } |
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206 |
649
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207 PolynomialSplineFunction spline; |
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208 |
649
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209 try { |
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210 spline = interpolator.interpolate(x, y); |
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211 } |
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212 catch (MathIllegalArgumentException miae) { |
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213 // TODO: I18N |
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214 errors.addProblem("creating spline interpolation failed."); |
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215 log.error(miae); |
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216 continue; |
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217 } |
343
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218 |
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219 try { |
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220 if (log.isDebugEnabled()) { |
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221 log.debug("spline points:"); |
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222 for (int j = 0; j < x.length; ++j) { |
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223 log.debug(x[j] + " " + y[j] + " " + spline.value(x[j])); |
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224 } |
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225 } |
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226 |
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227 for (back = Math.max(back, 0); |
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228 back < i && km[back] < end; |
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229 ++back |
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230 ) { |
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231 // to 3/4 point fill with spline values |
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232 ws[back] = spline.value(km[back]); |
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233 } |
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234 while (back < i) { |
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235 // fill the rest with ws[i] |
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236 ws[back++] = ws[i]; |
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237 } |
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238 } |
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239 catch (ArgumentOutsideDomainException aode) { |
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240 // TODO: I18N |
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241 errors.addProblem("spline interpolation failed."); |
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242 log.error("spline interpolation failed", aode); |
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243 } |
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244 } // for all km |
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245 |
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246 return !backjumps.isEmpty(); |
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247 } |
642
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248 |
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249 public static final boolean isIncreasing(double [] array) { |
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250 int inc = 0; |
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251 int dec = 0; |
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252 int sweet = (array.length-1)/2; |
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253 for (int i = 1; i < array.length; ++i) { |
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254 if (array[i] > array[i-1]) { |
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255 if (++inc > sweet) { |
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256 return true; |
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257 } |
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258 } |
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259 else if (++dec > sweet) { |
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260 return false; |
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261 } |
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262 } |
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263 return inc > sweet; |
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264 } |
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265 |
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266 public static final double [] swap(double [] array) { |
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267 int lo = 0; |
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268 int hi = array.length-1; |
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269 while (hi > lo) { |
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270 double t = array[lo]; |
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271 array[lo] = array[hi]; |
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272 array[hi] = t; |
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273 ++lo; |
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274 --hi; |
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275 } |
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276 |
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277 return array; |
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278 } |
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279 |
662
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BackJumpCorrector: Simpified array swapping.
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280 public static final double [] swapClone(double [] in) { |
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281 double [] out = new double[in.length]; |
642
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282 |
662
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283 for (int j = out.length-1, i = 0; j >= 0;) { |
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284 out[j--] = in[i++]; |
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285 } |
662
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286 |
642
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287 return out; |
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288 } |
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289 |
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290 public static final double [] sumDiffs(double [] in) { |
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291 double [] out = new double[in.length]; |
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292 |
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293 for (int i = 1; i < out.length; ++i) { |
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294 out[i] = out[i-1] + Math.abs(in[i-1] - in[i]); |
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295 } |
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296 |
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297 return out; |
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298 } |
343
f165c7d5d6db
Implementation of the "Ruecksprungkorrektur" to be done in "W fuer angepassten Abflusslaengschnitt".
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299 } |
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Implementation of the "Ruecksprungkorrektur" to be done in "W fuer angepassten Abflusslaengschnitt".
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300 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |