Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/XYColumn.java @ 507:45be952a3215

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Solved some issues. Removed encoding problems while formatting coordinates (issue137) and use this format as subtitle in charts (issue136). gnv-artifacts/trunk@590 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 21 Jan 2010 14:42:51 +0000
parents bc5901bb4525
children b1f5f2a8840f
rev   line source
427
a95aaeb206f7 Added data model classes to store information for interpolation.
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diff changeset
1 package de.intevation.gnv.math;
a95aaeb206f7 Added data model classes to store information for interpolation.
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2
a95aaeb206f7 Added data model classes to store information for interpolation.
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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
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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10 import org.apache.commons.math.analysis.UnivariateRealFunction;
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11
828df3ddb758 Added interpolation capabilities along z axis to XYColumns.
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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
a95aaeb206f7 Added data model classes to store information for interpolation.
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17 /**
a95aaeb206f7 Added data model classes to store information for interpolation.
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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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a95aaeb206f7 Added data model classes to store information for interpolation.
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20 */
429
bed9735adf84 Finished preprocessing data for interpolation in verticalcrosssection charts.ß
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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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
6a70e8883307 Added some type safety. Fixed z value bug in reading database preprocessing. Only dissemble WKT points if really needed.
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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
a95aaeb206f7 Added data model classes to store information for interpolation.
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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;
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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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