Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/GridCell.java @ 514:d9d933e06875
Fixed gnv/issue153
gnv-artifacts/trunk@608 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Fri, 22 Jan 2010 18:22:11 +0000 |
parents | |
children | 96a1e92e7ed2 |
rev | line source |
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514
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Fixed gnv/issue153
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1 package de.intevation.gnv.math; |
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2 |
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3 import com.vividsolutions.jts.geom.Coordinate; |
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4 import com.vividsolutions.jts.geom.Envelope; |
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5 import com.vividsolutions.jts.geom.Geometry; |
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6 import com.vividsolutions.jts.geom.GeometryFactory; |
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7 import com.vividsolutions.jts.geom.LinearRing; |
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8 import com.vividsolutions.jts.geom.Point; |
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9 import com.vividsolutions.jts.geom.Polygon; |
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10 |
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11 import com.vividsolutions.jts.index.ItemVisitor; |
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12 |
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13 import java.io.Serializable; |
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14 |
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15 import java.util.ArrayList; |
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16 import java.util.HashMap; |
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17 import java.util.List; |
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18 |
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19 /** |
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20 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de) |
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21 */ |
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22 public class GridCell |
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23 implements Serializable |
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24 { |
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25 public static final class CellFinder |
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26 implements ItemVisitor |
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27 { |
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28 public GridCell found; |
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29 |
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30 protected Point point; |
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31 |
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32 public CellFinder() { |
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33 } |
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34 |
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35 public void prepare(Coordinate center) { |
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36 found = null; |
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37 point = GEOMETRY_FACTORY.createPoint(center); |
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38 } |
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39 |
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40 public void visitItem(Object item) { |
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41 if (found == null) { |
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42 GridCell cell = (GridCell)item; |
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43 if (cell.contains(point)) { |
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44 found = cell; |
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45 } |
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46 } |
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47 } |
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48 } // class CellFinder |
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49 |
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50 public Point2d p1; |
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51 public Point2d p2; |
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52 public Point2d p3; |
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53 public Point2d p4; |
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54 |
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55 protected Polygon polygon; |
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56 |
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57 public static final GeometryFactory GEOMETRY_FACTORY |
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58 = new GeometryFactory(); |
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59 |
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60 public GridCell() { |
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61 } |
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62 |
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63 public GridCell(Point2d p1, Point2d p2, Point2d p3, Point2d p4) { |
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64 this.p1 = p1; |
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65 this.p2 = p2; |
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66 this.p3 = p3; |
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67 this.p4 = p4; |
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68 createPolygon(); |
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69 } |
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70 |
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71 protected void createPolygon() { |
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72 LinearRing shell = GEOMETRY_FACTORY |
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73 .createLinearRing(new Coordinate [] { p1, p2, p3, p4, p1 }); |
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74 polygon = GEOMETRY_FACTORY.createPolygon(shell, null); |
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75 } |
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76 |
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77 public Envelope getEnvelope() { |
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78 return polygon.getEnvelopeInternal(); |
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79 } |
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80 |
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81 public boolean contains(Geometry coord) { |
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82 return polygon.contains(coord); |
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83 } |
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84 |
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85 public static List<GridCell> pointsToGridCells( |
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86 List<? extends Point2d> points |
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87 ) { |
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88 int minI = Integer.MAX_VALUE; |
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89 int maxI = Integer.MIN_VALUE; |
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90 int minJ = Integer.MAX_VALUE; |
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91 int maxJ = Integer.MIN_VALUE; |
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92 |
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93 HashMap<Integer, HashMap<Integer, Point2d>> rows = |
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94 new HashMap<Integer, HashMap<Integer, Point2d>>(); |
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95 |
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96 for (Point2d p: points) { |
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97 |
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98 if (p.i < minI) minI = p.i; |
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99 if (p.i > maxI) maxI = p.i; |
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100 if (p.j < minJ) minJ = p.j; |
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101 if (p.j > maxJ) maxJ = p.j; |
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102 |
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103 HashMap<Integer, Point2d> row = rows.get(p.i); |
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104 |
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105 if (row == null) { |
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106 rows.put(p.i, row = new HashMap<Integer, Point2d>()); |
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107 } |
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108 |
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109 row.put(p.j, p); |
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110 } |
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111 |
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112 ArrayList<GridCell> cells = new ArrayList<GridCell>(points.size()); |
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113 |
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114 for (int i = minI + 1; i <= maxI; ++i) { |
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115 HashMap<Integer, Point2d> row1 = rows.get(i-1); |
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116 HashMap<Integer, Point2d> row2 = rows.get(i); |
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117 if (row1 != null && row2 != null) { |
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118 for (int j = minJ + 1; j < maxJ; ++j) { |
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119 Point2d p1 = row1.get(j-1); |
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120 Point2d p2 = row1.get(j); |
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121 Point2d p3 = row2.get(j); |
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122 Point2d p4 = row2.get(j-1); |
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123 |
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124 if (p1 != null && p2 != null && p3 != null && p4 != null) { |
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125 cells.add(new GridCell(p1, p2, p3, p4)); |
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126 } |
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127 } // for all columns in row |
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128 } |
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129 } // for all rows |
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130 |
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131 return cells; |
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132 } |
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133 } |
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134 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |