Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/AreaInterpolation.java @ 474:ab29e4ff2fda

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Added area interpolation needed for "Horizontalschnitt" gnv-artifacts/trunk@540 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 14 Jan 2010 10:34:05 +0000
parents
children d47b478e662b
rev   line source
474
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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diff changeset
1 package de.intevation.gnv.math;
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
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2
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
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3 import java.io.Serializable;
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4
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5 import java.util.ArrayList;
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6 import java.util.Arrays;
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7 import java.util.List;
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8 import java.util.HashMap;
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9 import java.util.Collections;
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10
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11 import java.awt.Dimension;
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12
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13 import com.vividsolutions.jts.geom.Coordinate;
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14 import com.vividsolutions.jts.geom.Envelope;
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15
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16 import com.vividsolutions.jts.index.quadtree.Quadtree;
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17
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18 import org.apache.log4j.Logger;
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19
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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20 /**
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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21 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
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22 */
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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23 public class AreaInterpolation
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24 implements Serializable
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25 {
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26 private static Logger log = Logger.getLogger(AreaInterpolation.class);
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27
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28 protected double [] raster;
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29
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30 protected int width;
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31 protected int height;
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32
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33 public AreaInterpolation() {
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34 }
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35
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36 public int getWidth() {
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37 return width;
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38 }
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39
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40 public int getHeight() {
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41 return height;
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42 }
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43
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44 public double [] getRaster() {
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45 return raster;
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46 }
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47
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48 public boolean interpolate(
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49 List<? extends Point2d> points,
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50 Envelope boundingBox,
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51 Dimension samples,
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52 XYDepth depth
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53 ) {
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54 if (points == null || points.isEmpty()) {
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55 return false;
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56 }
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57
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58 double [] buffer = Interpolation2D.calculateBuffer(points);
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59 double dxMax = buffer[0];
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60 double dyMax = buffer[1];
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61
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62 Quadtree spatialIndex = new Quadtree();
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63
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64 for (int i = points.size()-1; i >= 0; --i) {
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65 Point2d p = points.get(i);
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66 spatialIndex.insert(p.envelope(), p);
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67 }
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68
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69 int W = samples.width;
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70 int H = samples.height;
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71
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72 double cellWidth = boundingBox.getWidth() / W;
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73 double cellHeight = boundingBox.getHeight() / H;
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74
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75 Envelope queryBuffer = new Envelope();
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76 Point2d [] neighbors = new Point2d[4];
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77 Coordinate center = new Coordinate();
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78 L1Comparator invL1 = new L1Comparator(center);
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79
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80 double [] raster = new double[W*H];
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81 Arrays.fill(raster, Double.NaN);
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82
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83 int row = 0;
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84 for (int j = 0; j < H; ++j, row += W) {
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85 double y = j*cellHeight + 0.5d*cellHeight;
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86 double x = 0.5d*cellWidth;
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87 for (int i = 0; i < W; ++i, x += cellWidth) {
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88 queryBuffer.init(
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89 x - dxMax, x + dxMax,
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90 y - dyMax, y + dyMax);
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91
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92 List potential = spatialIndex.query(queryBuffer);
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93
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94 if (potential.isEmpty()) {
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95 continue;
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96 }
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97
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98 center.x = x; center.y = y;
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99 Collections.sort(potential, invL1);
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100
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101 neighbors[0] = neighbors[1] =
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102 neighbors[2] = neighbors[3] = null;
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103
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104 int mask = 0;
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105 // reversed order is essential here!
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106 for (int k = potential.size()-1; k >= 0; --k) {
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107 Point2d n = (Point2d)potential.get(k);
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108 int code = n.x > center.x ? 1 : 0;
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109 if (n.y > center.y) code |= 2;
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110 neighbors[code] = n;
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111 mask |= 1 << code;
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112 }
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113
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114 int numNeighbors = Integer.bitCount(mask);
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115
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116 // only interpolate if we have all four neighbors
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117 // we do not have any gaps and we are below surface.
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118 if (numNeighbors == 4
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119 && !neighbors[0].hasIGap(neighbors[1])
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120 && !neighbors[1].hasJGap(neighbors[3])
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121 && !neighbors[3].hasIGap(neighbors[2])
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
122 && !neighbors[2].hasJGap(neighbors[0])
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
123 && depth.depth(center) <= 0d
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
124 ) {
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
125 double z1 = Interpolation2D.interpolate(
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
126 neighbors[0].x, neighbors[0].z,
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
127 neighbors[1].x, neighbors[1].z,
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
128 center.x);
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
129 double z2 = Interpolation2D.interpolate(
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
130 neighbors[2].x, neighbors[2].z,
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
131 neighbors[3].x, neighbors[3].z,
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
132 center.x);
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
133 double y1 = Interpolation2D.interpolate(
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
134 neighbors[0].x, neighbors[0].y,
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
135 neighbors[1].x, neighbors[1].y,
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
136 center.x);
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
137 double y2 = Interpolation2D.interpolate(
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
138 neighbors[2].x, neighbors[2].y,
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
139 neighbors[3].x, neighbors[3].y,
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
140 center.x);
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
141 raster[row+i] = Interpolation2D.interpolate(
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
142 y1, z1,
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
143 y2, z2,
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
144 center.y);
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
145 }
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
146 }
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
147 }
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
148
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
149 this.raster = raster;
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
150 this.width = W;
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
151 this.height = H;
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
152
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
153 return true;
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
154 }
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
155 }
ab29e4ff2fda Added area interpolation needed for "Horizontalschnitt"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
156 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org