Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/XYColumn.java @ 867:35c3e82f7eaa
Changed the default directory of the artifact database.
gnv-artifacts/trunk@1006 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Tue, 27 Apr 2010 15:11:16 +0000 |
parents | 05bf8534a35a |
children | f953c9a559d8 |
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1 package de.intevation.gnv.math; |
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2 |
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3 import java.util.ArrayList; |
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4 import java.util.Collections; |
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5 import java.util.List; |
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6 |
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7 import org.apache.commons.math.FunctionEvaluationException; |
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8 import org.apache.commons.math.MathException; |
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9 |
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10 import org.apache.commons.math.analysis.UnivariateRealFunction; |
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11 |
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12 import org.apache.commons.math.analysis.interpolation.SplineInterpolator; |
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13 import org.apache.commons.math.analysis.interpolation.UnivariateRealInterpolator; |
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14 |
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15 import org.apache.log4j.Logger; |
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16 |
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17 /** |
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18 * A column of discrete attributed height values located at a point. |
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19 * Values between the discrete height values are interpolated. |
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20 * |
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21 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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22 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> |
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23 */ |
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24 public class XYColumn |
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25 extends Point2d |
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26 implements UnivariateRealFunction |
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27 { |
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28 private static Logger log = Logger.getLogger(XYColumn.class); |
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29 |
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30 /** |
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31 * The list of discrete height values. |
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32 */ |
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33 protected List<HeightValue> values; |
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34 |
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35 /** |
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36 * The curve used to interpolate the points between the |
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37 * discrete height values. |
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38 */ |
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39 protected transient UnivariateRealFunction curve; |
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40 |
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41 /** |
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42 * Default constructor. |
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43 */ |
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44 public XYColumn() { |
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45 values = new ArrayList<HeightValue>(); |
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46 } |
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47 |
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48 /** |
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49 * Constructor to create an XYColumn with a given (x, y) coordinate |
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50 * and an (i, j) index tuple. |
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51 * @param x The x coordinate. |
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52 * @param y The y coordinate. |
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53 * @param i The i component. |
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54 * @param j The j component. |
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55 */ |
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56 public XYColumn(double x, double y, int i, int j) { |
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57 super(x, y, i, j); |
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58 values = new ArrayList<HeightValue>(); |
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59 } |
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60 |
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61 /** |
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62 * Adds a given height value to the list of height values. |
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63 * @param value The height value. |
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64 */ |
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65 public void add(HeightValue value) { |
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66 values.add(value); |
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67 } |
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68 |
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69 /** |
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70 * Returns the list of height values. |
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71 * @return The list of height values. |
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72 */ |
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73 public List<HeightValue> getValues() { |
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74 return values; |
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75 } |
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76 |
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77 public double value(double depth) { |
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78 try { |
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79 if (curve != null) { |
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80 HeightValue h = values.get(0); |
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81 // extrapolate beyond boundaries by repeating |
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82 if (depth > h.z) return h.v; |
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83 h = values.get(values.size()-1); |
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84 if (depth < h.z) return h.v; |
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85 return curve.value(depth); |
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86 } |
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87 } |
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88 catch (FunctionEvaluationException fee) { |
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89 log.error("evaluation failed", fee); |
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90 } |
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91 |
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92 return Double.NaN; |
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93 } |
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94 |
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95 /** |
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96 * Prepares this XYColumn to be queried. A given XYDepth |
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97 * object is used to fill the values to a certain depth. |
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98 * @param xyDepth To figure out the depth a the cordinate. |
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99 * @return true if preparation succeeds else false. |
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100 */ |
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101 public boolean prepare(XYDepth xyDepth) { |
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102 if (curve == null) { |
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103 int N = values.size(); |
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104 if (N == 0) { |
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105 log.error("no points for interpolation"); |
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106 return false; |
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107 } |
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108 |
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109 if (N == 1) { |
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110 // only one value -> constant function |
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111 curve = new ConstantFunction(values.get(0).v); |
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112 } |
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113 else { // more than on value |
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114 double depth = xyDepth.depth(this); |
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115 Collections.sort(values, HeightValue.INV_Z_COMPARATOR); |
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116 |
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117 // if there is no value at 0 repeat first value |
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118 HeightValue first = values.get(0); |
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119 if (first.z < 0d) { |
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120 values.add(0, new HeightValue(0d, first.v, first.k-1)); |
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121 ++N; |
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122 } |
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123 |
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124 // if there is no value at depth repeat last value |
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125 HeightValue last = values.get(N-1); |
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126 if (last.z > depth) { |
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127 values.add(new HeightValue(depth, last.v, last.k+1)); |
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128 ++N; |
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129 } |
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130 if (N < 3) { // interpolate linear |
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131 first = values.get(0); |
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132 last = values.get(N-1); |
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133 curve = new LinearFunction.Univariate( |
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134 first.z, first.v, |
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135 last.z, last.v); |
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136 } |
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137 else { // higher degree interpolation |
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138 double [] z = new double[N]; |
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139 double [] v = new double[N]; |
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140 for (int i = 0; i < N; ++i) { |
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141 HeightValue h = values.get(N-1-i); |
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142 z[i] = h.z; |
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143 v[i] = h.v; |
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144 } |
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145 try { |
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146 curve = getInterpolator().interpolate(z, v); |
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147 } |
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148 catch (MathException me) { |
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149 log.error("interpolation failed", me); |
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150 return false; |
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151 } |
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152 } |
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153 } |
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154 } |
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155 return true; |
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156 } |
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157 |
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158 /** |
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159 * Returns the interpolator used to interpolate the values between |
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160 * the discrete height values. This class returns an instance of |
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161 * {@link org.apache.commons.math.analysis.interpolation.SplineInterpolator}. |
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162 * Override this if you want to use another kind of interpolation. |
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163 * @return The interpolator to be used. |
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164 */ |
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165 protected UnivariateRealInterpolator getInterpolator() { |
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166 return new SplineInterpolator(); |
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167 } |
427
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168 } |
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169 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |