Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/GridCell.java @ 592:3c939c95c477
Removed accidental checkin of Test-Shapefiles
gnv-artifacts/trunk@647 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Tim Englich <tim.englich@intevation.de> |
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date | Fri, 29 Jan 2010 13:28:28 +0000 |
parents | 4e347624ee7c |
children | b248531fa20b |
rev | line source |
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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 import org.apache.log4j.Logger; |
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20 |
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21 /** |
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22 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de) |
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23 */ |
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24 public class GridCell |
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25 implements Serializable |
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26 { |
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27 private static Logger log = Logger.getLogger(GridCell.class); |
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28 |
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29 public static final class CellFinder |
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30 implements ItemVisitor |
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31 { |
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32 public GridCell found; |
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33 |
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34 protected Point point; |
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35 |
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36 public CellFinder() { |
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37 } |
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38 |
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39 public void prepare(Coordinate center) { |
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40 found = null; |
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41 point = GEOMETRY_FACTORY.createPoint(center); |
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42 } |
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43 |
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44 public void visitItem(Object item) { |
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45 if (found == null) { |
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46 GridCell cell = (GridCell)item; |
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47 if (cell.contains(point)) { |
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48 found = cell; |
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49 } |
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50 } |
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51 } |
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52 } // class CellFinder |
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53 |
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54 public Point2d p1; |
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55 public Point2d p2; |
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56 public Point2d p3; |
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57 public Point2d p4; |
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58 |
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59 protected Polygon polygon; |
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60 |
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61 public static final GeometryFactory GEOMETRY_FACTORY |
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62 = new GeometryFactory(); |
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63 |
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64 public GridCell() { |
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65 } |
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66 |
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67 public GridCell(Point2d p1, Point2d p2, Point2d p3, Point2d p4) { |
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68 this.p1 = p1; |
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69 this.p2 = p2; |
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70 this.p3 = p3; |
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71 this.p4 = p4; |
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72 createPolygon(); |
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73 } |
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74 |
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75 protected void createPolygon() { |
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76 LinearRing shell = GEOMETRY_FACTORY |
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77 .createLinearRing(new Coordinate [] { p1, p2, p3, p4, p1 }); |
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78 polygon = GEOMETRY_FACTORY.createPolygon(shell, null); |
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79 } |
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80 |
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81 public Envelope getEnvelope() { |
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82 return polygon.getEnvelopeInternal(); |
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83 } |
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84 |
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85 public boolean contains(Geometry coord) { |
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86 return polygon.contains(coord); |
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87 } |
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88 |
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89 public static List<GridCell> pointsToGridCells( |
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90 List<? extends Point2d> points |
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91 ) { |
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92 return pointsToGridCells(points, null); |
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93 } |
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94 |
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95 public static List<GridCell> pointsToGridCells( |
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96 List<? extends Point2d> points, |
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97 Envelope relevantArea |
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98 ) { |
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99 int minI = Integer.MAX_VALUE; |
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100 int maxI = Integer.MIN_VALUE; |
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101 int minJ = Integer.MAX_VALUE; |
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102 int maxJ = Integer.MIN_VALUE; |
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103 |
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104 HashMap<Integer, HashMap<Integer, Point2d>> rows = |
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105 new HashMap<Integer, HashMap<Integer, Point2d>>(); |
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106 |
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107 int culled = 0; |
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108 |
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109 for (Point2d p: points) { |
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110 |
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111 if (relevantArea != null && !relevantArea.contains(p.x, p.y)) { |
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112 ++culled; |
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113 continue; |
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114 } |
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115 |
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116 if (p.i < minI) minI = p.i; |
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117 if (p.i > maxI) maxI = p.i; |
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118 if (p.j < minJ) minJ = p.j; |
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119 if (p.j > maxJ) maxJ = p.j; |
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120 |
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121 HashMap<Integer, Point2d> row = rows.get(p.i); |
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122 |
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123 if (row == null) { |
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124 rows.put(p.i, row = new HashMap<Integer, Point2d>()); |
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125 } |
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126 |
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127 row.put(p.j, p); |
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128 } |
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129 |
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130 ArrayList<GridCell> cells = new ArrayList<GridCell>(points.size()); |
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131 |
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132 for (int i = minI + 1; i <= maxI; ++i) { |
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133 HashMap<Integer, Point2d> row1 = rows.get(i-1); |
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134 HashMap<Integer, Point2d> row2 = rows.get(i); |
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135 if (row1 != null && row2 != null) { |
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136 for (int j = minJ + 1; j < maxJ; ++j) { |
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137 Point2d p1 = row1.get(j-1); |
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138 Point2d p2 = row1.get(j); |
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139 Point2d p3 = row2.get(j); |
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140 Point2d p4 = row2.get(j-1); |
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141 |
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142 if (p1 != null && p2 != null && p3 != null && p4 != null) { |
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143 cells.add(new GridCell(p1, p2, p3, p4)); |
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144 } |
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145 } // for all columns in row |
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146 } |
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147 } // for all rows |
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148 |
519
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149 if (log.isDebugEnabled()) { |
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150 log.debug("culled points: " + culled); |
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151 log.debug("min/max i: " + minI + " / " + maxI); |
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152 log.debug("min/max j: " + minJ + " / " + maxJ); |
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153 log.debug("cells found: " + cells.size()); |
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154 } |
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155 |
514
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156 return cells; |
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157 } |
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158 } |
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159 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |