Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/Interpolation2D.java @ 469:62fc63d0f71d

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Added a new State in Product Verticalprofile in Timeseriespoints. Now it will be displayed the Years where measurements happened and than only the dates of the chosen Year will be fetched and displayed. gnv-artifacts/trunk@532 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Tue, 12 Jan 2010 12:42:53 +0000
parents f42ed4f10b79
children ab29e4ff2fda
rev   line source
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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.List;
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5 import java.util.HashMap;
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6 import java.util.Collections;
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7
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8 import com.vividsolutions.jts.geom.Coordinate;
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9 import com.vividsolutions.jts.geom.Envelope;
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10
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11 import com.vividsolutions.jts.index.quadtree.Quadtree;
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12
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13 import org.apache.log4j.Logger;
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14
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15 /**
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16 * @author Sascha L. Teichmann
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17 */
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18 public final class Interpolation2D
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19 {
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20 private static Logger log = Logger.getLogger(Interpolation2D.class);
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21
361
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22 public interface Consumer {
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23 void interpolated(Coordinate point, boolean success);
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24 } // interface Consumer
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25
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26 private Interpolation2D() {
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27 }
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28
431
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29 public static final double [] calculateBuffer(
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30 List <? extends Point2d> points
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31 ) {
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32 HashMap<Integer, ArrayList<Point2d>> iMap =
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33 new HashMap<Integer, ArrayList<Point2d>>();
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34
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35 HashMap<Integer, ArrayList<Point2d>> jMap =
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36 new HashMap<Integer, ArrayList<Point2d>>();
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37
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38 for (int k = points.size()-1; k >= 0; --k) {
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39 Point2d p = points.get(k);
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40
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41 ArrayList<Point2d> jList = jMap.get(p.j);
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42 ArrayList<Point2d> iList = iMap.get(p.i);
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43
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44 if (jList == null) {
445
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45 jMap.put(p.j, jList = new ArrayList<Point2d>());
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46 }
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47 jList.add(p);
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48
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49 if (iList == null) {
445
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50 iMap.put(p.i, iList = new ArrayList<Point2d>());
431
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51 }
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52 iList.add(p);
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53 }
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parents: 416
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54
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55 double dxMax = -Double.MAX_VALUE;
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56 double dyMax = -Double.MAX_VALUE;
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57
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58 for (ArrayList<Point2d> v: jMap.values()) {
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59 Collections.sort(v, Point2d.Y_COMPARATOR);
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60 for (int i = 1, L = v.size(); i < L; ++i) {
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61 double dy = Math.abs(v.get(i).y - v.get(i-1).y);
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62 if (dy > dyMax) {
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63 dyMax = dy;
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64 }
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65 }
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66 }
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67
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68 dyMax += 1e-5d;
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69
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70 for (ArrayList<Point2d> v: iMap.values()) {
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71 Collections.sort(v, Point2d.X_COMPARATOR);
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72 for (int i = 1, L = v.size(); i < L; ++i) {
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73 double dx = Math.abs(v.get(i).x - v.get(i-1).x);
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74 if (dx > dxMax) {
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75 dxMax = dx;
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76 }
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77 }
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78 }
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79
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80 dxMax += 1e-5d;
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81
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82 return new double [] { dxMax, dyMax };
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83 }
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84
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85 public static void interpolate(
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86 List<? extends Coordinate> path,
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87 List<? extends Point2d> points,
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88 double from,
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89 double to,
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90 int steps,
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91 Metrics metrics,
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92 Consumer consumer
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93 ) {
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94 boolean debug = log.isDebugEnabled();
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parents: 431
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95
361
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96 int N = path.size();
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97 int M = points.size();
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98
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99 if (debug) {
416
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100 log.debug("Size of path: " + N);
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101 log.debug("Size of points: " + M);
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102 }
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103
361
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104 if (M < 1 || N < 2) { // nothing to do
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105 return;
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106 }
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107
431
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108 double [] buffer = calculateBuffer(points);
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109 double dxMax = buffer[0];
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parents: 416
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110 double dyMax = buffer[1];
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parents: 361
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111
434
0eed5749fd63 Implemented the raster interpolation for the 'Profilschnitt'.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 431
diff changeset
112 if (debug) {
416
04a242c67fe6 Added support of gap detection in horizontalcrossprofile charts.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 366
diff changeset
113 log.debug("buffer size: " + dxMax + " / " + dyMax);
04a242c67fe6 Added support of gap detection in horizontalcrossprofile charts.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 366
diff changeset
114 }
361
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
115
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
116 // put into spatial index to speed up finding neighbors.
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
117 Quadtree spatialIndex = new Quadtree();
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
118
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
119 for (int i = 0; i < M; ++i) {
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
120 Point2d p = points.get(i);
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
121 spatialIndex.insert(p.envelope(), p);
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
122 }
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
123
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
124 LinearToMap linearToMap = new LinearToMap(
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
125 path, from, to, metrics);
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
126
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
127 double dP = (to - from)/steps;
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
128
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
129 Coordinate center = new Coordinate();
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
130
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
131 Envelope queryBuffer = new Envelope();
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
132
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
133 Point2d [] neighbors = new Point2d[4];
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
134
365
f66088a43ecc Added horizontal crossprofile charts to chart pallet. Fixed some bugs before interpolation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 361
diff changeset
135 int missedInterpolations = 0;
f66088a43ecc Added horizontal crossprofile charts to chart pallet. Fixed some bugs before interpolation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 361
diff changeset
136 int interpolations = 0;
f66088a43ecc Added horizontal crossprofile charts to chart pallet. Fixed some bugs before interpolation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 361
diff changeset
137
f66088a43ecc Added horizontal crossprofile charts to chart pallet. Fixed some bugs before interpolation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 361
diff changeset
138 for (double p = from; p <= to; p += dP) {
361
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
139 if (!linearToMap.locate(p, center)) {
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
140 continue;
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
141 }
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
142 queryBuffer.init(
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
143 center.x - dxMax, center.x + dxMax,
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
144 center.y - dyMax, center.y + dyMax);
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
145
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
146 List potential = spatialIndex.query(queryBuffer);
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
147
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
148 L1Comparator invL1 = new L1Comparator(center);
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
149 Collections.sort(potential, invL1);
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
150
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
151 neighbors[0] = neighbors[1] =
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
152 neighbors[2] = neighbors[3] = null;
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
153
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
154 /* bit code of neighbors
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
155 0---1
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
156 | x |
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
157 2---3
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
158 */
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
159
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
160 int mask = 0;
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
161 // reversed order is essential here!
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
162 for (int i = potential.size()-1; i >= 0; --i) {
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
163 Point2d n = (Point2d)potential.get(i);
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
164 int code = n.x > center.x ? 1 : 0;
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
165 if (n.y > center.y) code |= 2;
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
166 neighbors[code] = n;
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
167 mask |= 1 << code;
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
168 }
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
169
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
170 int numNeighbors = Integer.bitCount(mask);
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
171
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
172 // only interpolate if we have all four neighbors
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
173 // and we do not have any gaps.
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
174 if (numNeighbors == 4
366
086e3af38b96 Fixed index error in i-gap detection in 2D interpolation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 365
diff changeset
175 && !neighbors[0].hasIGap(neighbors[1])
361
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
176 && !neighbors[1].hasJGap(neighbors[3])
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
177 && !neighbors[3].hasIGap(neighbors[2])
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
178 && !neighbors[2].hasJGap(neighbors[0])
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
179 ) {
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
180 double z1 = interpolate(
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
181 neighbors[0].x, neighbors[0].z,
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
182 neighbors[1].x, neighbors[1].z,
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
183 center.x);
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
184 double z2 = interpolate(
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
185 neighbors[2].x, neighbors[2].z,
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
186 neighbors[3].x, neighbors[3].z,
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
187 center.x);
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
188 double y1 = interpolate(
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
189 neighbors[0].x, neighbors[0].y,
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
190 neighbors[1].x, neighbors[1].y,
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
191 center.x);
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
192 double y2 = interpolate(
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
193 neighbors[2].x, neighbors[2].y,
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
194 neighbors[3].x, neighbors[3].y,
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
195 center.x);
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
196 center.z = interpolate(
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
197 y1, z1,
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
198 y2, z2,
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
199 center.y);
416
04a242c67fe6 Added support of gap detection in horizontalcrossprofile charts.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 366
diff changeset
200 consumer.interpolated(center, true);
365
f66088a43ecc Added horizontal crossprofile charts to chart pallet. Fixed some bugs before interpolation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 361
diff changeset
201 ++interpolations;
f66088a43ecc Added horizontal crossprofile charts to chart pallet. Fixed some bugs before interpolation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 361
diff changeset
202 }
f66088a43ecc Added horizontal crossprofile charts to chart pallet. Fixed some bugs before interpolation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 361
diff changeset
203 else {
416
04a242c67fe6 Added support of gap detection in horizontalcrossprofile charts.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 366
diff changeset
204 consumer.interpolated(center, false);
365
f66088a43ecc Added horizontal crossprofile charts to chart pallet. Fixed some bugs before interpolation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 361
diff changeset
205 ++missedInterpolations;
361
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
206 }
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
207 }
365
f66088a43ecc Added horizontal crossprofile charts to chart pallet. Fixed some bugs before interpolation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 361
diff changeset
208
434
0eed5749fd63 Implemented the raster interpolation for the 'Profilschnitt'.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 431
diff changeset
209 if (debug) {
416
04a242c67fe6 Added support of gap detection in horizontalcrossprofile charts.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 366
diff changeset
210 log.debug("interpolations: " +
04a242c67fe6 Added support of gap detection in horizontalcrossprofile charts.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 366
diff changeset
211 interpolations + " / " + missedInterpolations);
04a242c67fe6 Added support of gap detection in horizontalcrossprofile charts.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 366
diff changeset
212 }
361
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
213 }
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
214
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
215 public static final double interpolate(
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
216 double x1, double y1,
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
217 double x2, double y2,
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
218 double x
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
219 ) {
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
220 if (x2 == x1) {
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
221 return (y1 + y2)*0.5d;
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
222 }
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
223 double m = (y2-y1)/(x2-x1);
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
224 double b = y1 - m*x1;
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
225 return m*x + b;
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
226 }
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
227 }
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
228 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org