Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/XYColumn.java @ 605:e8ebdbc7f1e3

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First step of removing the cache blob. The static part of the describe document will be created by using the input data stored at each state. Some TODOs left (see ChangeLog). gnv-artifacts/trunk@671 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 09 Feb 2010 14:27:55 +0000
parents bc5901bb4525
children b1f5f2a8840f
rev   line source
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diff changeset
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.List;
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5 import java.util.Collections;
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6
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7 import org.apache.commons.math.analysis.interpolation.SplineInterpolator;
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8 import org.apache.commons.math.analysis.interpolation.UnivariateRealInterpolator;
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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.MathException;
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13 import org.apache.commons.math.FunctionEvaluationException;
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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 * @author Ingo Weinzierl <ingo.weinzierl@intevation.de>
431
422275fc9927 Refactored the XYColumn and Point2d code a bit to be more reusable in 3D.
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19 * @author Sascha L. Teichmann <sascha.teichmann@intevation.de>
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20 */
429
bed9735adf84 Finished preprocessing data for interpolation in verticalcrosssection charts.ß
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21 public class XYColumn
431
422275fc9927 Refactored the XYColumn and Point2d code a bit to be more reusable in 3D.
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22 extends Point2d
433
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23 implements UnivariateRealFunction
429
bed9735adf84 Finished preprocessing data for interpolation in verticalcrosssection charts.ß
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24 {
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25 private static Logger log = Logger.getLogger(XYColumn.class);
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26
432
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27 protected List<HeightValue> values;
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28
433
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29 protected transient UnivariateRealFunction curve;
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30
431
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31 public XYColumn() {
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32 values = new ArrayList<HeightValue>();
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33 }
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34
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35 public XYColumn(double x, double y, int i, int j) {
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36 super(x, y, i, j);
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37 values = new ArrayList<HeightValue>();
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38 }
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39
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40 public void add(HeightValue value) {
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41 values.add(value);
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42 }
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43
432
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44 public List<HeightValue> getValues() {
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45 return values;
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46 }
433
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47
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48 public double value(double depth) {
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49 try {
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50 if (curve != null) {
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51 HeightValue h = values.get(0);
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52 // extrapolate beyond boundaries by repeating
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53 if (depth > h.z) return h.v;
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54 h = values.get(values.size()-1);
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55 if (depth < h.z) return h.v;
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56 return curve.value(depth);
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57 }
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58 }
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59 catch (FunctionEvaluationException fee) {
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60 log.error("evaluation failed", fee);
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61 }
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62
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63 return Double.NaN;
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64 }
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65
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66 public boolean prepare(XYDepth xyDepth) {
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67 if (curve == null) {
451
bc5901bb4525 Use JFreeCharts ValueAxis.valueToJava2D() to transform data values
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68 int N = values.size();
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69 if (N == 0) {
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70 log.error("no points for interpolation");
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71 return false;
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72 }
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73
433
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74 if (N == 1) {
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75 // only one value -> constant function
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76 curve = new ConstantFunction(values.get(0).v);
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77 }
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78 else { // more than on value
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79 double depth = xyDepth.depth(this);
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80 Collections.sort(values, HeightValue.INV_Z_COMPARATOR);
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81
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82 // if there is no value at 0 repeat first value
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83 HeightValue first = values.get(0);
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84 if (first.z < 0d) {
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85 values.add(0, new HeightValue(0d, first.v, first.k-1));
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86 ++N;
433
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87 }
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88
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89 // if there is no value at depth repeat last value
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90 HeightValue last = values.get(N-1);
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91 if (last.z > depth) {
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92 values.add(new HeightValue(depth, last.v, last.k+1));
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93 ++N;
433
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94 }
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95 if (N < 3) { // interpolate linear
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96 first = values.get(0);
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97 last = values.get(N-1);
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98 curve = new LinearFunction.Univariate(
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99 first.z, first.v,
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100 last.z, last.v);
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101 }
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102 else { // higher degree interpolation
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103 double [] z = new double[N];
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104 double [] v = new double[N];
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105 for (int i = 0; i < N; ++i) {
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106 HeightValue h = values.get(N-1-i);
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107 z[i] = h.z;
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108 v[i] = h.v;
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109 }
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110 try {
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111 curve = getInterpolator().interpolate(z, v);
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112 }
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113 catch (MathException me) {
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114 log.error("interpolation failed", me);
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115 return false;
433
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116 }
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117 }
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118 }
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119 }
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120 return true;
433
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121 }
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122
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123 protected UnivariateRealInterpolator getInterpolator() {
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 432
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124 return new SplineInterpolator();
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 432
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125 }
427
a95aaeb206f7 Added data model classes to store information for interpolation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents:
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126 }
431
422275fc9927 Refactored the XYColumn and Point2d code a bit to be more reusable in 3D.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 429
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127 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
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