Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/JTSMultiPolygonProducer.java @ 1115:f953c9a559d8

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Added license file and license headers. gnv-artifacts/trunk@1260 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 02 Nov 2010 17:46:55 +0000
parents feae2f9d6c6f
children
rev   line source
1115
f953c9a559d8 Added license file and license headers.
Ingo Weinzierl <ingo.weinzierl@intevation.de>
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
f953c9a559d8 Added license file and license headers.
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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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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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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
802
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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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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
802
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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
802
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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 }
465
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228 }
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229
802
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230 /**
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231 * Returns a index -&gt; 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
802
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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
802
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261 /**
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262 * Returns a index -&gt; 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
802
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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 :
http://dive4elements.wald.intevation.org