Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/ATWriter.java @ 747:65dcb5891206

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ATWriter: Fixed array size to construct spline with stricly increasing values. flys-artifacts/trunk@2251 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 27 Jun 2011 13:58:03 +0000
parents 39d191f011dc
children 821aaceb2776
rev   line source
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1 package de.intevation.flys.exports;
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2
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3 import java.io.IOException;
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4 import java.io.Writer;
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5 import java.io.PrintWriter;
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6
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7 import java.util.Locale;
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8
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9 import de.intevation.flys.artifacts.model.WQ;
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11 import org.apache.commons.math.analysis.UnivariateRealFunction;
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13 import org.apache.commons.math.analysis.interpolation.SplineInterpolator;
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14 import org.apache.commons.math.analysis.interpolation.LinearInterpolator;
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16 import org.apache.commons.math.analysis.polynomials.PolynomialFunction;
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17
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18 import org.apache.commons.math.FunctionEvaluationException;
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19
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20 import org.apache.log4j.Logger;
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21
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22 public class ATWriter
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23 {
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24 private static Logger logger = Logger.getLogger(ATWriter.class);
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25
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26 public static final int COLUMNS = 10;
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27
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28 public static final String EMPTY = " ";
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29
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30 protected double minW;
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31 protected double maxW;
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32 protected double minQ;
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33 protected double maxQ;
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35 protected UnivariateRealFunction qFunc;
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36
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37 public ATWriter() {
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38 }
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39
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40 public ATWriter(WQ wq) throws IllegalArgumentException {
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41
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42 int maxIndex = maxIncreasingWIndex(wq);
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43
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44 if (maxIndex < 1) { // Only first w can be written out.
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45 minW = maxW = wq.getW(0);
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46 minQ = maxQ = wq.getQ(0);
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47 // constant function
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48 qFunc = new PolynomialFunction(new double [] { minQ });
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49 return;
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50 }
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51
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52 double [] ws = new double[maxIndex];
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53 double [] qs = new double[ws.length];
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54
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55 for (int i = 0; i < ws.length; ++i) {
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56 ws[i] = wq.getW(i);
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57 qs[i] = wq.getQ(i);
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58 }
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59
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60 qFunc = ws.length < 3
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61 ? new LinearInterpolator().interpolate(ws, qs)
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62 : new SplineInterpolator().interpolate(ws, qs);
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63
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64 minW = wq.getW(0);
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65 maxW = wq.getW(maxIndex);
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66 minQ = wq.getQ(0);
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67 maxQ = wq.getQ(maxIndex);
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68 }
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69
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70 public static int maxIncreasingWIndex(WQ wq) {
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71
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72 int N = wq.size();
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73
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74 if (N < 2) {
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75 return N-1;
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76 }
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77
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78 double last = wq.getW(0);
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79
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80 for (int i = 1; i < N; ++i) {
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81 double current = wq.getW(i);
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82 if (current <= last) {
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83 return i-1;
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84 }
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85 }
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86
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87 return N-1;
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88 }
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89
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90 public double getQ(double w) {
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91
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92 try {
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93 return qFunc.value(w);
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94 }
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95 catch (FunctionEvaluationException aode) {
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96 // should not happen
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97 logger.warn("spline interpolation failed", aode);
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98 return w <= minW ? minQ : maxQ;
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99 }
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100 }
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101
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102 protected static void printQ(PrintWriter out, double q) {
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103 String format;
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104 if (q < 1d) format = " % 8.3f";
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105 else if (q < 10d) format = " % 8.2f";
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106 else if (q < 100d) format = " % 8.1f";
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107 else {
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108 format = " % 8.0f";
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109 if (q > 1000d) q = Math.rint(q/10d)*10d;
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110 }
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111 out.printf(Locale.US, format, q);
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112 }
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113
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114 public void write(Writer writer) throws IOException {
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115
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116 PrintWriter out = new PrintWriter(writer);
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117
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118 double rest = Math.abs(minW % COLUMNS);
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120 double startW = Math.round(minW*10.0)/10.0;
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121 if (rest >= 1d) {
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122 startW -= 0.1;
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123 out.printf(Locale.US, "%8d", (int)Math.round(startW*100.0));
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124 int columns = (int)Math.floor(rest);
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125 for (int i = columns; i < COLUMNS; ++i) {
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126 out.print(EMPTY);
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127 }
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128 for (int i = COLUMNS-columns; i < COLUMNS; ++i) {
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129 printQ(out, getQ(startW + i*0.01));
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130 }
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131 out.println();
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132 startW += 0.1;
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133 }
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134
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135 int col = 0;
732
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136 for (double w = startW; w <= maxW; w += 0.01) {
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137 if (col == 0) {
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138 out.printf(Locale.US, "%8d", (int)Math.round(w*100.0));
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139 }
729
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140
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141 printQ(out, getQ(w));
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142
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143 if (++col >= COLUMNS) {
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144 out.println();
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145 col = 0;
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146 }
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147 }
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148
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149 if (col > 0) {
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150 out.println();
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151 }
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152
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153 out.flush();
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154 }
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155 }
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156 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org