Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/XYColumn.java @ 1119:7c4f81f74c47

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merged gnv-artifacts
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:14:00 +0200
parents f953c9a559d8
children
rev   line source
1115
f953c9a559d8 Added license file and license headers.
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.gnv.math;
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10
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11 import java.util.ArrayList;
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12 import java.util.Collections;
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13 import java.util.List;
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14
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15 import org.apache.commons.math.FunctionEvaluationException;
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16 import org.apache.commons.math.MathException;
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17
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18 import org.apache.commons.math.analysis.UnivariateRealFunction;
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19
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20 import org.apache.commons.math.analysis.interpolation.SplineInterpolator;
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21 import org.apache.commons.math.analysis.interpolation.UnivariateRealInterpolator;
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22
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23 import org.apache.log4j.Logger;
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24
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25 /**
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26 * A column of discrete attributed height values located at a point.
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27 * Values between the discrete height values are interpolated.
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28 *
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29 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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30 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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31 */
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32 public class XYColumn
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33 extends Point2d
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34 implements UnivariateRealFunction
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35 {
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36 private static Logger log = Logger.getLogger(XYColumn.class);
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37
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38 /**
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39 * The list of discrete height values.
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40 */
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41 protected List<HeightValue> values;
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42
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43 /**
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44 * The curve used to interpolate the points between the
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45 * discrete height values.
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46 */
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47 protected transient UnivariateRealFunction curve;
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48
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49 /**
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50 * Default constructor.
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51 */
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52 public XYColumn() {
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53 values = new ArrayList<HeightValue>();
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54 }
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55
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56 /**
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57 * Constructor to create an XYColumn with a given (x, y) coordinate
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58 * and an (i, j) index tuple.
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59 * @param x The x coordinate.
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60 * @param y The y coordinate.
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61 * @param i The i component.
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62 * @param j The j component.
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63 */
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64 public XYColumn(double x, double y, int i, int j) {
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65 super(x, y, i, j);
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66 values = new ArrayList<HeightValue>();
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67 }
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68
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69 /**
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70 * Adds a given height value to the list of height values.
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71 * @param value The height value.
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72 */
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73 public void add(HeightValue value) {
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74 values.add(value);
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75 }
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76
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77 /**
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78 * Returns the list of height values.
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79 * @return The list of height values.
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80 */
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81 public List<HeightValue> getValues() {
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82 return values;
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83 }
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84
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85 public double value(double depth) {
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86 try {
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87 if (curve != null) {
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88 HeightValue h = values.get(0);
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89 // extrapolate beyond boundaries by repeating
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90 if (depth > h.z) return h.v;
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91 h = values.get(values.size()-1);
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92 if (depth < h.z) return h.v;
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93 return curve.value(depth);
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94 }
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95 }
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96 catch (FunctionEvaluationException fee) {
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97 log.error("evaluation failed", fee);
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98 }
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99
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100 return Double.NaN;
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101 }
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102
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103 /**
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104 * Prepares this XYColumn to be queried. A given XYDepth
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105 * object is used to fill the values to a certain depth.
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106 * @param xyDepth To figure out the depth a the cordinate.
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107 * @return true if preparation succeeds else false.
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108 */
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109 public boolean prepare(XYDepth xyDepth) {
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110 if (curve == null) {
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111 int N = values.size();
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112 if (N == 0) {
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113 log.error("no points for interpolation");
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114 return false;
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115 }
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116
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117 if (N == 1) {
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118 // only one value -> constant function
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119 curve = new ConstantFunction(values.get(0).v);
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120 }
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121 else { // more than on value
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122 double depth = xyDepth.depth(this);
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123 Collections.sort(values, HeightValue.INV_Z_COMPARATOR);
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124
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125 // if there is no value at 0 repeat first value
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126 HeightValue first = values.get(0);
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127 if (first.z < 0d) {
448
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128 values.add(0, new HeightValue(0d, first.v, first.k-1));
445
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129 ++N;
433
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130 }
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131
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132 // if there is no value at depth repeat last value
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133 HeightValue last = values.get(N-1);
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134 if (last.z > depth) {
448
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135 values.add(new HeightValue(depth, last.v, last.k+1));
445
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136 ++N;
433
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137 }
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138 if (N < 3) { // interpolate linear
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139 first = values.get(0);
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140 last = values.get(N-1);
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141 curve = new LinearFunction.Univariate(
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142 first.z, first.v,
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143 last.z, last.v);
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144 }
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145 else { // higher degree interpolation
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146 double [] z = new double[N];
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147 double [] v = new double[N];
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148 for (int i = 0; i < N; ++i) {
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149 HeightValue h = values.get(N-1-i);
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150 z[i] = h.z;
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151 v[i] = h.v;
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152 }
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153 try {
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154 curve = getInterpolator().interpolate(z, v);
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155 }
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156 catch (MathException me) {
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157 log.error("interpolation failed", me);
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158 return false;
433
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159 }
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160 }
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161 }
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162 }
434
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163 return true;
433
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164 }
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165
807
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166 /**
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167 * Returns the interpolator used to interpolate the values between
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168 * the discrete height values. This class returns an instance of
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169 * {@link org.apache.commons.math.analysis.interpolation.SplineInterpolator}.
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170 * Override this if you want to use another kind of interpolation.
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171 * @return The interpolator to be used.
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172 */
433
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173 protected UnivariateRealInterpolator getInterpolator() {
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174 return new SplineInterpolator();
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175 }
427
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176 }
836
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177 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org