Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/Interpolation2D.java @ 430:23e9352df09b

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Load salinity palette correctly. gnv-artifacts/trunk@478 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 22 Dec 2009 20:45:45 +0000
parents 04a242c67fe6
children 422275fc9927
rev   line source
361
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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.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
361
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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
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29 public static void interpolate(
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30 List<? extends Coordinate> path,
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31 List<? extends Point2d> points,
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32 double from,
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33 double to,
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34 int steps,
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35 Metrics metrics,
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36 Consumer consumer
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37 ) {
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38 int N = path.size();
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39 int M = points.size();
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40
416
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41 if (log.isDebugEnabled()) {
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42 log.debug("Size of path: " + N);
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43 log.debug("Size of points: " + M);
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44 }
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45
361
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46 if (M < 1 || N < 2) { // nothing to do
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47 return;
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48 }
365
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49
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50 HashMap<Integer, ArrayList<Point2d>> map = new HashMap<Integer, ArrayList<Point2d>>();
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51
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52 for (int k = M-1; k >= 0; --k) {
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53 Point2d p = points.get(k);
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54
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55 ArrayList<Point2d> list = map.get(p.j);
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56
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57 if (list == null) {
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58 map.put(p.j, list = new ArrayList<Point2d>());
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59 }
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60 list.add(p);
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61 }
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62
361
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63 double dxMax = -Double.MAX_VALUE;
365
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64
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65 for (ArrayList<Point2d> v: map.values()) {
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66 Collections.sort(v, Point2d.X_COMPARATOR);
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67 for (int i = 1, L = v.size(); i < L; ++i) {
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68 double dx = Math.abs(v.get(i).x - v.get(i-1).x);
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69 if (dx > dxMax) {
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70 dxMax = dx;
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71 }
361
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72 }
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73 }
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74
416
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75 dxMax += 1e-5d;
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76
365
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77 map.clear();
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78
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79 for (int k = M-1; k >= 0; --k) {
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80 Point2d p = points.get(k);
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81
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82 ArrayList<Point2d> list = map.get(p.i);
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83
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84 if (list == null) {
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85 map.put(p.i, list = new ArrayList<Point2d>());
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86 }
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87 list.add(p);
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88 }
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89
361
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90 double dyMax = -Double.MAX_VALUE;
365
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91
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92 for (ArrayList<Point2d> v: map.values()) {
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93 Collections.sort(v, Point2d.Y_COMPARATOR);
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94 for (int i = 1, L = v.size(); i < L; ++i) {
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95 double dy = Math.abs(v.get(i).y - v.get(i-1).y);
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96 if (dy > dyMax) {
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97 dyMax = dy;
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98 }
361
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99 }
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100 }
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101
416
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102 dyMax += 1e-5d;
365
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103
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104 map = null;
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105
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106 if (log.isDebugEnabled()) {
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107 log.debug("buffer size: " + dxMax + " / " + dyMax);
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108 }
361
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109
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110 // put into spatial index to speed up finding neighbors.
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111 Quadtree spatialIndex = new Quadtree();
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112
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113 for (int i = 0; i < M; ++i) {
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114 Point2d p = points.get(i);
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115 spatialIndex.insert(p.envelope(), p);
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116 }
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117
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118 LinearToMap linearToMap = new LinearToMap(
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parents:
diff changeset
119 path, from, to, metrics);
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parents:
diff changeset
120
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
121 double dP = (to - from)/steps;
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parents:
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122
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parents:
diff changeset
123 Coordinate center = new Coordinate();
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parents:
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124
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parents:
diff changeset
125 Envelope queryBuffer = new Envelope();
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parents:
diff changeset
126
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diff changeset
127 Point2d [] neighbors = new Point2d[4];
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
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parents:
diff changeset
128
365
f66088a43ecc Added horizontal crossprofile charts to chart pallet. Fixed some bugs before interpolation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 361
diff changeset
129 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
130 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
131
f66088a43ecc Added horizontal crossprofile charts to chart pallet. Fixed some bugs before interpolation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 361
diff changeset
132 for (double p = from; p <= to; p += dP) {
361
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133 if (!linearToMap.locate(p, center)) {
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
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parents:
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134 continue;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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135 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
136 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
137 center.x - dxMax, center.x + dxMax,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
138 center.y - dyMax, center.y + dyMax);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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139
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
140 List potential = spatialIndex.query(queryBuffer);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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141
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
142 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
143 Collections.sort(potential, invL1);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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144
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
145 neighbors[0] = neighbors[1] =
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parents:
diff changeset
146 neighbors[2] = neighbors[3] = null;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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147
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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148 /* bit code of neighbors
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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149 0---1
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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150 | x |
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parents:
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151 2---3
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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152 */
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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153
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
154 int mask = 0;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
155 // reversed order is essential here!
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
156 for (int i = potential.size()-1; i >= 0; --i) {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
157 Point2d n = (Point2d)potential.get(i);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
158 int code = n.x > center.x ? 1 : 0;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
159 if (n.y > center.y) code |= 2;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
160 neighbors[code] = n;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
161 mask |= 1 << code;
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
162 }
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
163
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
164 int numNeighbors = Integer.bitCount(mask);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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165
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
166 // only interpolate if we have all four neighbors
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
167 // and we do not have any gaps.
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
168 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
169 && !neighbors[0].hasIGap(neighbors[1])
361
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parents:
diff changeset
170 && !neighbors[1].hasJGap(neighbors[3])
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
171 && !neighbors[3].hasIGap(neighbors[2])
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
172 && !neighbors[2].hasJGap(neighbors[0])
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
173 ) {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
174 double z1 = interpolate(
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
175 neighbors[0].x, neighbors[0].z,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
176 neighbors[1].x, neighbors[1].z,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
177 center.x);
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
178 double z2 = interpolate(
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
179 neighbors[2].x, neighbors[2].z,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
180 neighbors[3].x, neighbors[3].z,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
181 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
182 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
183 neighbors[0].x, neighbors[0].y,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
184 neighbors[1].x, neighbors[1].y,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
185 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
186 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
187 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
188 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
189 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
190 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
191 y1, z1,
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
192 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
193 center.y);
416
04a242c67fe6 Added support of gap detection in horizontalcrossprofile charts.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 366
diff changeset
194 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
195 ++interpolations;
f66088a43ecc Added horizontal crossprofile charts to chart pallet. Fixed some bugs before interpolation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 361
diff changeset
196 }
f66088a43ecc Added horizontal crossprofile charts to chart pallet. Fixed some bugs before interpolation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 361
diff changeset
197 else {
416
04a242c67fe6 Added support of gap detection in horizontalcrossprofile charts.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 366
diff changeset
198 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
199 ++missedInterpolations;
361
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
200 }
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
201 }
365
f66088a43ecc Added horizontal crossprofile charts to chart pallet. Fixed some bugs before interpolation.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 361
diff changeset
202
416
04a242c67fe6 Added support of gap detection in horizontalcrossprofile charts.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 366
diff changeset
203 if (log.isDebugEnabled()) {
04a242c67fe6 Added support of gap detection in horizontalcrossprofile charts.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 366
diff changeset
204 log.debug("interpolations: " +
04a242c67fe6 Added support of gap detection in horizontalcrossprofile charts.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 366
diff changeset
205 interpolations + " / " + missedInterpolations);
04a242c67fe6 Added support of gap detection in horizontalcrossprofile charts.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
parents: 366
diff changeset
206 }
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
207 }
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
208
aec85d00d82c Added code to do 2D interpolations along a digitied track on the map.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
209 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
210 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
211 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
212 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
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 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
215 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
216 }
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 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
218 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
219 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
220 }
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 }
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 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org