Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/JTSMultiPolygonProducer.java @ 1145:dfe1ac687c7f tip
added tags
author | Thomas Arendsen Hein <thomas@intevation.de> |
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date | Fri, 28 Sep 2012 12:16:15 +0200 |
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1 /* |
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2 * Copyright (c) 2010 by Intevation GmbH |
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3 * |
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4 * This program is free software under the LGPL (>=v2.1) |
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5 * Read the file LGPL.txt coming with the software for details |
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6 * or visit http://www.gnu.org/licenses/ if it does not exist. |
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7 */ |
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8 |
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9 package de.intevation.gnv.raster; |
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10 |
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11 import com.vividsolutions.jts.algorithm.CGAlgorithms; |
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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.Geometry; |
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15 import com.vividsolutions.jts.geom.GeometryFactory; |
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16 import com.vividsolutions.jts.geom.LinearRing; |
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17 import com.vividsolutions.jts.geom.MultiPolygon; |
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18 import com.vividsolutions.jts.geom.Polygon; |
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19 import com.vividsolutions.jts.geom.PrecisionModel; |
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20 import com.vividsolutions.jts.geom.TopologyException; |
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21 |
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22 import com.vividsolutions.jts.geom.impl.PackedCoordinateSequenceFactory; |
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23 |
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24 import de.intevation.gnv.raster.Vectorizer.Edge; |
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25 |
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26 import java.util.ArrayList; |
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27 import java.util.HashMap; |
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28 import java.util.List; |
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29 import java.util.Map; |
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30 import java.util.TreeMap; |
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31 |
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32 import org.apache.log4j.Logger; |
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33 |
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34 /** |
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35 * Vectorizer backend to generated polygons in form of |
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36 * JTS multi multi polygons. |
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37 * |
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38 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> |
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39 */ |
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40 public class JTSMultiPolygonProducer |
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41 extends AbstractProducer |
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42 { |
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43 private static Logger log = Logger.getLogger( |
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44 JTSMultiPolygonProducer.class); |
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45 |
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46 /** |
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47 * The reference system of used coordinates: {@value} |
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48 */ |
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49 public static final int SRID_WGS84 = 4326; |
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50 |
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51 /** |
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52 * Interface to decouple the conversion of the internal |
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53 * index scheme of the polygons to an external one. |
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54 */ |
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55 public interface ValueConverter { |
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56 |
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57 /** |
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58 * Maps integer index schemes. |
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59 * @param value The input value. |
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60 * @return The resulting index. |
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61 */ |
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62 Integer convert(Integer value); |
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63 |
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64 } // interface ValueConverter |
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65 |
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66 /** |
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67 * The JTS geometry factory. |
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68 */ |
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69 protected GeometryFactory geometryFactory; |
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70 |
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71 /** |
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72 * The clipping polygon. |
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73 */ |
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74 protected Polygon clip; |
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75 |
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76 /** |
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77 * Internal map to map the internal polygons indices to a |
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78 * list of generated polygons. |
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79 */ |
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80 protected HashMap<Integer, ArrayList<Polygon>> valueToPolygons; |
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81 |
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82 /** |
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83 * Default constructor. |
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84 */ |
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85 public JTSMultiPolygonProducer() { |
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86 } |
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87 |
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88 /** |
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89 * Constructor to create a JTSMultiPolygonProducer with a |
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90 * given clipping polygon and a world bounding box. |
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91 * @param clip The clipping polygon. |
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92 * @param minX Min x coord of the world. |
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93 * @param minY Min y coord of the world. |
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94 * @param maxX Max x coord of the world. |
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95 * @param maxY Max y coord of the world. |
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96 */ |
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97 public JTSMultiPolygonProducer( |
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98 Polygon clip, |
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99 double minX, double minY, |
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100 double maxX, double maxY |
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101 ) { |
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102 this( |
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103 clip, |
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104 createDefaultGeometryFactory(), |
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105 minX, minY, |
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106 maxX, maxY); |
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107 } |
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108 |
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109 /** |
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110 * Constructor to create a JTSMultiPolygonProducer with a |
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111 * given clipping polygon, a geometry factory and a world bounding box. |
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112 * @param clip The clipping polygon. |
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113 * @param geometryFactory The geometry factory. |
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114 * @param minX Min x coord of the world. |
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115 * @param minY Min y coord of the world. |
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116 * @param maxX Max x coord of the world. |
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117 * @param maxY Max y coord of the world. |
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118 */ |
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119 public JTSMultiPolygonProducer( |
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120 Polygon clip, |
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121 GeometryFactory geometryFactory, |
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122 double minX, double minY, |
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123 double maxX, double maxY |
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124 ) { |
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125 super(minX, minY, maxX, maxY); |
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126 this.clip = clip; |
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127 this.geometryFactory = geometryFactory; |
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128 valueToPolygons = new HashMap<Integer, ArrayList<Polygon>>(); |
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129 } |
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130 |
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131 /** |
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132 * Creates a 3D geometry factory via |
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133 * {@link #createDefaultGeometryFactory(int)}. |
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134 * @return The new geometry factory. |
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135 */ |
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136 public static GeometryFactory createDefaultGeometryFactory() { |
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137 return createDefaultGeometryFactory(3); |
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138 } |
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139 |
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140 /** |
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141 * Creates a geometry factory with a given dimension. |
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142 * @param dim The dimension. |
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143 * @return The new geometry factory. |
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144 */ |
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145 public static GeometryFactory createDefaultGeometryFactory(int dim) { |
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146 return new GeometryFactory( |
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147 new PrecisionModel( |
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148 PrecisionModel.FLOATING), |
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149 SRID_WGS84, |
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150 new PackedCoordinateSequenceFactory( |
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151 PackedCoordinateSequenceFactory.DOUBLE, |
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152 dim)); |
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153 } |
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154 |
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155 public void handleRings( |
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156 List<Edge> rings, |
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157 int value, |
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158 int width, |
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159 int height |
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160 ) { |
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161 if (value == -1) { |
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162 return; |
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163 } |
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164 |
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165 double b1 = minX; |
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166 double m1 = width != 1 |
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167 ? (maxX - minX)/(width-1) |
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168 : 0d; |
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169 |
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170 double b2 = minY; |
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171 double m2 = height != 1 |
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172 ? (maxY - minY)/(height-1) |
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173 : 0d; |
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174 |
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175 ArrayList<Coordinate> vertices = new ArrayList<Coordinate>(); |
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176 |
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177 LinearRing shell = null; |
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178 ArrayList<LinearRing> holes = new ArrayList<LinearRing>(); |
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179 |
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180 for (Edge head: rings) { |
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181 Edge current = head; |
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182 do { |
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183 vertices.add(new Coordinate( |
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184 m1*(current.a % width) + b1, |
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185 m2*(current.a / width) + b2)); |
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186 } |
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187 while ((current = current.prev) != head); |
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188 vertices.add(new Coordinate( |
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189 m1*(head.a % width) + b1, |
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190 m2*(head.a / width) + b2)); |
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191 |
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192 Coordinate [] coordinates = |
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193 vertices.toArray(new Coordinate[vertices.size()]); |
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194 |
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195 vertices.clear(); |
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196 |
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197 LinearRing ring = geometryFactory.createLinearRing( |
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198 coordinates); |
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199 |
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200 if (CGAlgorithms.isCCW(coordinates)) { |
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201 shell = ring; |
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202 } |
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203 else { |
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204 holes.add(ring); |
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205 } |
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206 } |
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207 |
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208 if (shell == null) { |
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209 log.error("polygon has no shell"); |
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210 return; |
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211 } |
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212 |
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213 Polygon polygon = geometryFactory.createPolygon( |
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214 shell, |
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215 holes.toArray(new LinearRing[holes.size()])); |
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216 |
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217 if (clip == null || clip.intersects(polygon)) { |
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218 Integer v = Integer.valueOf(value); |
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219 |
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220 ArrayList<Polygon> polygons = valueToPolygons.get(v); |
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221 |
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222 if (polygons == null) { |
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223 valueToPolygons.put(v, polygons = new ArrayList<Polygon>()); |
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224 } |
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225 |
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226 polygons.add(polygon); |
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227 } |
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228 } |
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229 |
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230 /** |
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231 * Returns a index -> multi polyon map. The internal index scheme |
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232 * is retained. |
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233 * {@link #getMultiPolygons(de.intevation.gnv.raster.JTSMultiPolygonProducer.ValueConverter)} |
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234 * @return The new map. |
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235 */ |
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236 public Map<Integer, MultiPolygon> getMultiPolygons() { |
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237 return getMultiPolygons(null); |
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238 } |
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239 |
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240 /** |
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241 * Flattend a JTS geometry to a multi polygon if possible |
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242 * @param result The geometry to be flattend |
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243 * @return The resulting multi polygon. |
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244 */ |
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245 protected MultiPolygon flattenCollection(Geometry result) { |
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246 |
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247 if (result instanceof MultiPolygon) { |
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248 return (MultiPolygon)result; |
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249 } |
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250 |
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251 if (result instanceof Polygon) { |
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252 return geometryFactory.createMultiPolygon( |
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253 new Polygon[] { (Polygon)result }); |
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254 } |
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255 |
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256 log.warn("cannot handle " + result.getClass()); |
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257 |
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258 return null; |
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259 } |
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260 |
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261 /** |
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262 * Returns a index -> multi polyon map. The internal index scheme |
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263 * is remapped with the given value converter. |
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264 * @param valueConverter Converter to remap the index scheme. Maybe null |
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265 * if no remapping is required. |
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266 * @return The new map. |
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267 */ |
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268 public Map<Integer, MultiPolygon> getMultiPolygons( |
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269 ValueConverter valueConverter |
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270 ) { |
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271 TreeMap<Integer, MultiPolygon> multiPolygons = |
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272 new TreeMap<Integer, MultiPolygon>(); |
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273 |
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274 for (Map.Entry<Integer, ArrayList<Polygon>> entry: |
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275 valueToPolygons.entrySet() |
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276 ) { |
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277 ArrayList<Polygon> polygons = entry.getValue(); |
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278 |
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279 Integer value = valueConverter != null |
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280 ? valueConverter.convert(entry.getKey()) |
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281 : entry.getKey(); |
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282 |
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283 MultiPolygon mp = geometryFactory.createMultiPolygon( |
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284 polygons.toArray(new Polygon[polygons.size()])); |
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285 |
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286 if (clip != null) { |
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287 try { |
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288 Geometry result = mp.intersection(clip); |
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289 |
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290 MultiPolygon mp2 = flattenCollection(result); |
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291 |
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292 if (mp2 != null) { mp = mp2; } |
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293 } |
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294 catch (TopologyException te) { |
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295 log.error(te.getLocalizedMessage(), te); |
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296 } |
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297 } |
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298 multiPolygons.put(value, mp); |
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299 } |
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300 |
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301 return multiPolygons; |
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302 } |
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303 |
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304 /** |
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305 * Empties internal temporary data structures to save some memory. |
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306 */ |
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307 public void clear() { |
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308 valueToPolygons.clear(); |
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309 } |
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310 } |
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311 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |