Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/exports/ATWriter.java @ 737:6b38b8488401
Fix for flys/issue86
flys-artifacts/trunk@2233 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Sun, 26 Jun 2011 13:07:44 +0000 |
parents | 39d191f011dc |
children | 65dcb5891206 |
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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10 |
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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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15 |
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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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34 |
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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+1]; |
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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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119 |
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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; |
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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 } |
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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 : |