Mercurial > dive4elements > gnv-client
annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/JTSMultiPolygonProducer.java @ 823:499cfbbb61bc
Removed obsolet SuppressWarnings-Annotations.
gnv-artifacts/trunk@910 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Tim Englich <tim.englich@intevation.de> |
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date | Tue, 13 Apr 2010 08:25:34 +0000 |
parents | feae2f9d6c6f |
children | f953c9a559d8 |
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1 package de.intevation.gnv.raster; |
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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.Geometry; |
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7 import com.vividsolutions.jts.geom.GeometryFactory; |
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8 import com.vividsolutions.jts.geom.LinearRing; |
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9 import com.vividsolutions.jts.geom.MultiPolygon; |
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10 import com.vividsolutions.jts.geom.Polygon; |
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11 import com.vividsolutions.jts.geom.PrecisionModel; |
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12 import com.vividsolutions.jts.geom.TopologyException; |
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13 |
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14 import com.vividsolutions.jts.geom.impl.PackedCoordinateSequenceFactory; |
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15 |
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16 import de.intevation.gnv.raster.Vectorizer.Edge; |
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17 |
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18 import java.util.ArrayList; |
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19 import java.util.HashMap; |
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20 import java.util.List; |
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21 import java.util.Map; |
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22 import java.util.TreeMap; |
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23 |
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24 import org.apache.log4j.Logger; |
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25 |
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26 /** |
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27 * Vectorizer backend to generated polygons in form of |
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28 * JTS multi multi polygons. |
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29 * |
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30 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> |
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31 */ |
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32 public class JTSMultiPolygonProducer |
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33 extends AbstractProducer |
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34 { |
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35 private static Logger log = Logger.getLogger( |
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36 JTSMultiPolygonProducer.class); |
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37 |
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38 /** |
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39 * The reference system of used coordinates: {@value} |
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40 */ |
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41 public static final int SRID_WGS84 = 4326; |
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42 |
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43 /** |
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44 * Interface to decouple the conversion of the internal |
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45 * index scheme of the polygons to an external one. |
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46 */ |
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47 public interface ValueConverter { |
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48 |
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49 /** |
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50 * Maps integer index schemes. |
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51 * @param value The input value. |
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52 * @return The resulting index. |
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53 */ |
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54 Integer convert(Integer value); |
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55 |
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56 } // interface ValueConverter |
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57 |
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58 /** |
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59 * The JTS geometry factory. |
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60 */ |
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61 protected GeometryFactory geometryFactory; |
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62 |
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63 /** |
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64 * The clipping polygon. |
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65 */ |
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66 protected Polygon clip; |
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67 |
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68 /** |
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69 * Internal map to map the internal polygons indices to a |
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70 * list of generated polygons. |
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71 */ |
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72 protected HashMap<Integer, ArrayList<Polygon>> valueToPolygons; |
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73 |
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74 /** |
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75 * Default constructor. |
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76 */ |
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77 public JTSMultiPolygonProducer() { |
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78 } |
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79 |
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80 /** |
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81 * Constructor to create a JTSMultiPolygonProducer with a |
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82 * given clipping polygon and a world bounding box. |
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83 * @param clip The clipping polygon. |
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84 * @param minX Min x coord of the world. |
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85 * @param minY Min y coord of the world. |
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86 * @param maxX Max x coord of the world. |
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87 * @param maxY Max y coord of the world. |
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88 */ |
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89 public JTSMultiPolygonProducer( |
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90 Polygon clip, |
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91 double minX, double minY, |
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92 double maxX, double maxY |
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93 ) { |
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94 this( |
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95 clip, |
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96 createDefaultGeometryFactory(), |
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97 minX, minY, |
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98 maxX, maxY); |
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99 } |
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100 |
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101 /** |
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102 * Constructor to create a JTSMultiPolygonProducer with a |
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103 * given clipping polygon, a geometry factory and a world bounding box. |
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104 * @param clip The clipping polygon. |
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105 * @param geometryFactory The geometry factory. |
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106 * @param minX Min x coord of the world. |
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107 * @param minY Min y coord of the world. |
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108 * @param maxX Max x coord of the world. |
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109 * @param maxY Max y coord of the world. |
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110 */ |
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111 public JTSMultiPolygonProducer( |
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112 Polygon clip, |
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113 GeometryFactory geometryFactory, |
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114 double minX, double minY, |
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115 double maxX, double maxY |
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116 ) { |
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117 super(minX, minY, maxX, maxY); |
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118 this.clip = clip; |
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119 this.geometryFactory = geometryFactory; |
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120 valueToPolygons = new HashMap<Integer, ArrayList<Polygon>>(); |
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121 } |
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122 |
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123 /** |
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124 * Creates a 3D geometry factory via |
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125 * {@link #createDefaultGeometryFactory(int)}. |
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126 * @return The new geometry factory. |
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127 */ |
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128 public static GeometryFactory createDefaultGeometryFactory() { |
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129 return createDefaultGeometryFactory(3); |
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130 } |
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131 |
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132 /** |
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133 * Creates a geometry factory with a given dimension. |
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134 * @param dim The dimension. |
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135 * @return The new geometry factory. |
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136 */ |
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137 public static GeometryFactory createDefaultGeometryFactory(int dim) { |
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138 return new GeometryFactory( |
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139 new PrecisionModel( |
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140 PrecisionModel.FLOATING), |
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141 SRID_WGS84, |
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142 new PackedCoordinateSequenceFactory( |
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143 PackedCoordinateSequenceFactory.DOUBLE, |
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144 dim)); |
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145 } |
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146 |
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147 public void handleRings( |
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148 List<Edge> rings, |
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149 int value, |
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150 int width, |
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151 int height |
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152 ) { |
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153 if (value == -1) { |
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154 return; |
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155 } |
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156 |
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157 double b1 = minX; |
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158 double m1 = width != 1 |
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159 ? (maxX - minX)/(width-1) |
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160 : 0d; |
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161 |
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162 double b2 = minY; |
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163 double m2 = height != 1 |
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164 ? (maxY - minY)/(height-1) |
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165 : 0d; |
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166 |
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167 ArrayList<Coordinate> vertices = new ArrayList<Coordinate>(); |
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168 |
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169 LinearRing shell = null; |
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170 ArrayList<LinearRing> holes = new ArrayList<LinearRing>(); |
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171 |
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172 for (Edge head: rings) { |
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173 Edge current = head; |
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174 do { |
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175 vertices.add(new Coordinate( |
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176 m1*(current.a % width) + b1, |
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177 m2*(current.a / width) + b2)); |
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178 } |
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179 while ((current = current.prev) != head); |
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180 vertices.add(new Coordinate( |
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181 m1*(head.a % width) + b1, |
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182 m2*(head.a / width) + b2)); |
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183 |
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184 Coordinate [] coordinates = |
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185 vertices.toArray(new Coordinate[vertices.size()]); |
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186 |
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187 vertices.clear(); |
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188 |
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189 LinearRing ring = geometryFactory.createLinearRing( |
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190 coordinates); |
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191 |
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192 if (CGAlgorithms.isCCW(coordinates)) { |
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193 shell = ring; |
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194 } |
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195 else { |
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196 holes.add(ring); |
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197 } |
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198 } |
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199 |
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200 if (shell == null) { |
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201 log.error("polygon has no shell"); |
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202 return; |
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203 } |
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204 |
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205 Polygon polygon = geometryFactory.createPolygon( |
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206 shell, |
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207 holes.toArray(new LinearRing[holes.size()])); |
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208 |
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209 if (clip == null || clip.intersects(polygon)) { |
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210 Integer v = Integer.valueOf(value); |
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211 |
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212 ArrayList<Polygon> polygons = valueToPolygons.get(v); |
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213 |
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214 if (polygons == null) { |
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215 valueToPolygons.put(v, polygons = new ArrayList<Polygon>()); |
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216 } |
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217 |
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218 polygons.add(polygon); |
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219 } |
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220 } |
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221 |
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222 /** |
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223 * Returns a index -> multi polyon map. The internal index scheme |
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224 * is retained. |
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225 * {@link #getMultiPolygons(de.intevation.gnv.raster.JTSMultiPolygonProducer.ValueConverter)} |
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226 * @return The new map. |
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227 */ |
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228 public Map<Integer, MultiPolygon> getMultiPolygons() { |
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229 return getMultiPolygons(null); |
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230 } |
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231 |
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232 /** |
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233 * Flattend a JTS geometry to a multi polygon if possible |
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234 * @param result The geometry to be flattend |
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235 * @return The resulting multi polygon. |
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236 */ |
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237 protected MultiPolygon flattenCollection(Geometry result) { |
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238 |
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239 if (result instanceof MultiPolygon) { |
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240 return (MultiPolygon)result; |
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241 } |
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242 |
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243 if (result instanceof Polygon) { |
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244 return geometryFactory.createMultiPolygon( |
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245 new Polygon[] { (Polygon)result }); |
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246 } |
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247 |
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248 log.warn("cannot handle " + result.getClass()); |
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249 |
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250 return null; |
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251 } |
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252 |
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253 /** |
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254 * Returns a index -> multi polyon map. The internal index scheme |
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255 * is remapped with the given value converter. |
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256 * @param valueConverter Converter to remap the index scheme. Maybe null |
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257 * if no remapping is required. |
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258 * @return The new map. |
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259 */ |
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260 public Map<Integer, MultiPolygon> getMultiPolygons( |
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261 ValueConverter valueConverter |
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262 ) { |
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263 TreeMap<Integer, MultiPolygon> multiPolygons = |
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264 new TreeMap<Integer, MultiPolygon>(); |
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265 |
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266 for (Map.Entry<Integer, ArrayList<Polygon>> entry: |
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267 valueToPolygons.entrySet() |
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268 ) { |
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269 ArrayList<Polygon> polygons = entry.getValue(); |
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270 |
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271 Integer value = valueConverter != null |
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272 ? valueConverter.convert(entry.getKey()) |
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273 : entry.getKey(); |
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274 |
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275 MultiPolygon mp = geometryFactory.createMultiPolygon( |
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276 polygons.toArray(new Polygon[polygons.size()])); |
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277 |
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278 if (clip != null) { |
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279 try { |
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280 Geometry result = mp.intersection(clip); |
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281 |
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282 MultiPolygon mp2 = flattenCollection(result); |
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283 |
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284 if (mp2 != null) { mp = mp2; } |
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285 } |
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286 catch (TopologyException te) { |
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287 log.error(te.getLocalizedMessage(), te); |
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288 } |
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289 } |
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290 multiPolygons.put(value, mp); |
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291 } |
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292 |
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293 return multiPolygons; |
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294 } |
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295 |
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296 /** |
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297 * Empties internal temporary data structures to save some memory. |
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298 */ |
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299 public void clear() { |
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300 valueToPolygons.clear(); |
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301 } |
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302 } |
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303 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |