Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/GridCell.java @ 794:d0967fdee36f

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Repaired JavaDoc in Export package. gnv-artifacts/trunk@876 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 31 Mar 2010 12:18:03 +0000
parents c4156275c1e1
children d766fe2d917a
rev   line source
514
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1 package de.intevation.gnv.math;
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2
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3 import com.vividsolutions.jts.algorithm.CGAlgorithms;
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4
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5 import com.vividsolutions.jts.geom.Coordinate;
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6 import com.vividsolutions.jts.geom.Envelope;
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7 import com.vividsolutions.jts.geom.Geometry;
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8 import com.vividsolutions.jts.geom.GeometryFactory;
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9 import com.vividsolutions.jts.geom.LinearRing;
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10 import com.vividsolutions.jts.geom.Point;
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11 import com.vividsolutions.jts.geom.Polygon;
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12
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13 import com.vividsolutions.jts.index.ItemVisitor;
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14
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15 import java.io.Serializable;
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16
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17 import java.util.ArrayList;
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18 import java.util.HashMap;
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19 import java.util.List;
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20
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21 import org.apache.log4j.Logger;
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22
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23 /**
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24 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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25 */
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26 public class GridCell
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27 implements Serializable
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28 {
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29 private static Logger log = Logger.getLogger(GridCell.class);
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30
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31 public static final class CellFinder
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32 implements ItemVisitor
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33 {
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34 public GridCell found;
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35
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36 protected Point point;
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37
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38 public CellFinder() {
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39 }
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40
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41 public void prepare(Coordinate center) {
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42 found = null;
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43 point = GEOMETRY_FACTORY.createPoint(center);
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44 }
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45
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46 public void visitItem(Object item) {
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47 if (found == null) {
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48 GridCell cell = (GridCell)item;
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49 if (cell.contains(point)) {
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50 found = cell;
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51 }
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52 }
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53 }
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54 } // class CellFinder
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55
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56 public Point2d p1;
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57 public Point2d p2;
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58 public Point2d p3;
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59 public Point2d p4;
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60
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61 protected Polygon polygon;
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62
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63 public static final GeometryFactory GEOMETRY_FACTORY
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64 = new GeometryFactory();
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65
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66 public GridCell() {
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67 }
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68
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69 public GridCell(Point2d p1, Point2d p2, Point2d p3, Point2d p4) {
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70 this.p1 = p1;
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71 this.p2 = p2;
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72 this.p3 = p3;
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73 this.p4 = p4;
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74 createPolygon();
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75 }
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76
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77 protected void createPolygon() {
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78 Coordinate [] coords = new Coordinate [] { p1, p2, p3, p4, p1 };
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79 if (!CGAlgorithms.isCCW(coords)) {
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80 for (int i = 0, j = coords.length-1; i < j; ++i, --j) {
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81 Coordinate c = coords[i];
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82 coords[i] = coords[j];
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83 coords[j] = c;
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84 }
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85 }
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86 LinearRing shell = GEOMETRY_FACTORY
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87 .createLinearRing(coords);
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88
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89 if (!shell.isValid()) {
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90 log.warn("linear ring is not valid");
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91 }
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92
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93 polygon = GEOMETRY_FACTORY.createPolygon(shell, null);
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94 }
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95
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96 public Envelope getEnvelope() {
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97 return polygon.getEnvelopeInternal();
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98 }
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99
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100 public boolean contains(Geometry coord) {
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101 return polygon.contains(coord);
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102 }
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103
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104 public static List<GridCell> pointsToGridCells(
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105 List<? extends Point2d> points
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106 ) {
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107 return pointsToGridCells(points, null);
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108 }
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109
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110 public static List<GridCell> pointsToGridCells(
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111 List<? extends Point2d> points,
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112 Envelope relevantArea
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113 ) {
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114 return pointsToGridCells(points, relevantArea, 0);
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115 }
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116
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117 private static final int NEIGHBORS [][] = {
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118 { -1, -1 }, // 0
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119 { -1, 0 }, // 1
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120 { -1, +1 }, // 2
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121 { 0, +1 }, // 3
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122 { +1, +1 }, // 4
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123 { +1, 0 }, // 5
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124 { +1, -1 }, // 6
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125 { 0, -1 } // 7
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126 };
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127
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128 public static int extrapolate(
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129 HashMap<Integer, HashMap<Integer, Point2d>> rows,
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130 int minI, int maxI,
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131 int minJ, int maxJ,
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132 int rounds,
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133 Envelope relevantArea
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134 ) {
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135 Point2d [] neighbors = new Point2d[NEIGHBORS.length];
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136 Point2d [] positions = new Point2d[NEIGHBORS.length];
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137
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diff changeset
138 int total = 0;
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139
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diff changeset
140 ArrayList<ArrayList<IJKey>> prio =
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141 new ArrayList<ArrayList<IJKey>>(NEIGHBORS.length);
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142
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diff changeset
143 for (int i = 0; i < NEIGHBORS.length; ++i) {
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diff changeset
144 prio.add(new ArrayList<IJKey>());
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145 }
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146
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diff changeset
147 while (rounds-- > 0) {
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148 for (int i = minI; i <= maxI; ++i) {
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diff changeset
149 for (int j = minJ; j <= maxJ; ++j) {
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150 Point2d p = get(rows, i, j);
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151 if (p != null) {
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152 continue;
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153 }
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154
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diff changeset
155 int count = 0;
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156
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157 for (int k = 0; k < neighbors.length; ++k) {
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158 neighbors[k] = positions[k] = null;
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159 int dij [] = NEIGHBORS[k];
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160 Point2d n1 = get(rows, i+ dij[0], j+ dij[1]);
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161 Point2d n2 = get(rows, i+2*dij[0], j+2*dij[1]);
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162 if (n1 != null && n2 != null) {
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163 ++count;
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164 }
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165 }
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166
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167 if (count > 0) {
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diff changeset
168 prio.get(count-1).add(new IJKey(i, j));
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169 }
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170 } // for all columns
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171 } // for all rows
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172
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diff changeset
173 int N = 0;
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174
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diff changeset
175 for (int l = NEIGHBORS.length-1; l >= 0; --l) {
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diff changeset
176 ArrayList<IJKey> list = prio.get(l);
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diff changeset
177 for (IJKey ij: list) {
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diff changeset
178 int i = ij.i;
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179 int j = ij.j;
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diff changeset
180 for (int k = 0; k < neighbors.length; ++k) {
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181 neighbors[k] = positions[k] = null;
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diff changeset
182 int dij [] = NEIGHBORS[k];
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diff changeset
183 Point2d n1 = get(rows, i+ dij[0], j+ dij[1]);
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184 Point2d n2 = get(rows, i+2*dij[0], j+2*dij[1]);
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185 if (n1 != null && n2 != null) {
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diff changeset
186 neighbors[k] = n1;
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diff changeset
187 positions[k] = n1.extrapolate(-1d, n2);
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188 }
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189 }
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190
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191 Point2d avg = Point2d.average(positions);
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192
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193 if (avg != null && avg.near(positions)
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diff changeset
194 && (relevantArea == null || relevantArea.contains(avg.x, avg.y))) {
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diff changeset
195 avg.i = i;
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diff changeset
196 avg.j = j;
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diff changeset
197 avg.inverseDistanceWeighting(neighbors);
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diff changeset
198 put(rows, avg, i, j);
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199 }
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diff changeset
200 }
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diff changeset
201 N += list.size();
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diff changeset
202 list.clear();
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diff changeset
203 }
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diff changeset
204
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diff changeset
205 if (N == 0) {
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diff changeset
206 break;
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diff changeset
207 }
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diff changeset
208 total += N;
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diff changeset
209 } // for all rounds
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diff changeset
210
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diff changeset
211 return total;
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diff changeset
212 }
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diff changeset
213
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diff changeset
214 public static List<GridCell> pointsToGridCells(
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diff changeset
215 List<? extends Point2d> points,
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diff changeset
216 Envelope relevantArea,
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diff changeset
217 int extrapolationRounds
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diff changeset
218 ) {
514
d9d933e06875 Fixed gnv/issue153
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parents:
diff changeset
219 int minI = Integer.MAX_VALUE;
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parents:
diff changeset
220 int maxI = Integer.MIN_VALUE;
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parents:
diff changeset
221 int minJ = Integer.MAX_VALUE;
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parents:
diff changeset
222 int maxJ = Integer.MIN_VALUE;
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parents:
diff changeset
223
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diff changeset
224 HashMap<Integer, HashMap<Integer, Point2d>> rows =
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parents:
diff changeset
225 new HashMap<Integer, HashMap<Integer, Point2d>>();
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parents:
diff changeset
226
517
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parents: 514
diff changeset
227 int culled = 0;
96a1e92e7ed2 If the number of data points to generate a "Horizontalschnitt"
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parents: 514
diff changeset
228
514
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parents:
diff changeset
229 for (Point2d p: points) {
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parents:
diff changeset
230
517
96a1e92e7ed2 If the number of data points to generate a "Horizontalschnitt"
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parents: 514
diff changeset
231 if (relevantArea != null && !relevantArea.contains(p.x, p.y)) {
96a1e92e7ed2 If the number of data points to generate a "Horizontalschnitt"
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parents: 514
diff changeset
232 ++culled;
96a1e92e7ed2 If the number of data points to generate a "Horizontalschnitt"
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parents: 514
diff changeset
233 continue;
96a1e92e7ed2 If the number of data points to generate a "Horizontalschnitt"
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parents: 514
diff changeset
234 }
96a1e92e7ed2 If the number of data points to generate a "Horizontalschnitt"
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parents: 514
diff changeset
235
514
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parents:
diff changeset
236 if (p.i < minI) minI = p.i;
d9d933e06875 Fixed gnv/issue153
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parents:
diff changeset
237 if (p.i > maxI) maxI = p.i;
d9d933e06875 Fixed gnv/issue153
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parents:
diff changeset
238 if (p.j < minJ) minJ = p.j;
d9d933e06875 Fixed gnv/issue153
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parents:
diff changeset
239 if (p.j > maxJ) maxJ = p.j;
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parents:
diff changeset
240
d9d933e06875 Fixed gnv/issue153
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parents:
diff changeset
241 HashMap<Integer, Point2d> row = rows.get(p.i);
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parents:
diff changeset
242
d9d933e06875 Fixed gnv/issue153
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parents:
diff changeset
243 if (row == null) {
d9d933e06875 Fixed gnv/issue153
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parents:
diff changeset
244 rows.put(p.i, row = new HashMap<Integer, Point2d>());
d9d933e06875 Fixed gnv/issue153
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parents:
diff changeset
245 }
d9d933e06875 Fixed gnv/issue153
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parents:
diff changeset
246
d9d933e06875 Fixed gnv/issue153
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parents:
diff changeset
247 row.put(p.j, p);
d9d933e06875 Fixed gnv/issue153
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parents:
diff changeset
248 }
d9d933e06875 Fixed gnv/issue153
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parents:
diff changeset
249
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250 ArrayList<GridCell> cells = new ArrayList<GridCell>(points.size());
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251
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252 int extrapolated = extrapolate(
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253 rows,
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254 minI, maxI,
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255 minJ, maxJ,
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256 extrapolationRounds,
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257 relevantArea);
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258
514
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259 for (int i = minI + 1; i <= maxI; ++i) {
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260 HashMap<Integer, Point2d> row1 = rows.get(i-1);
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261 HashMap<Integer, Point2d> row2 = rows.get(i);
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262
593
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263 if (row1 == null || row2 == null) {
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264 continue;
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265 }
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266
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267 for (int j = minJ + 1; j < maxJ; ++j) {
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268 Point2d p1 = row1.get(j-1);
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269 Point2d p2 = row1.get(j);
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270 Point2d p3 = row2.get(j);
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271 Point2d p4 = row2.get(j-1);
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272
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273 if (p1 != null && p2 != null && p3 != null && p4 != null) {
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274 cells.add(new GridCell(p1, p2, p3, p4));
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275 }
514
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276 }
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277 } // for all rows
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278
519
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279 if (log.isDebugEnabled()) {
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280 log.debug("culled points: " + culled);
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281 log.debug("extrapolated points: " + extrapolated);
519
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282 log.debug("min/max i: " + minI + " / " + maxI);
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283 log.debug("min/max j: " + minJ + " / " + maxJ);
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284 log.debug("cells found: " + cells.size());
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285 }
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286
514
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287 return cells;
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288 }
593
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289
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290 private static Point2d get(
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291 HashMap<Integer, HashMap<Integer, Point2d>> rows,
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292 int i, int j
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293 ) {
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294 HashMap<Integer, Point2d> row = rows.get(i);
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295 return row != null ? row.get(j) : null;
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296 }
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297
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298 private static void put(
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299 HashMap<Integer, HashMap<Integer, Point2d>> rows,
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300 Point2d point,
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301 int i, int j
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302 ) {
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303 Integer I = Integer.valueOf(i);
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304 HashMap<Integer, Point2d> row = rows.get(I);
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305 if (row == null) {
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306 rows.put(I, row = new HashMap<Integer, Point2d>());
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307 }
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308 row.put(j, point);
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309 }
514
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310 }
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311 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org