Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/JTSMultiPolygonProducer.java @ 802:4abe172be970

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Finished Javadoc of the raster package. gnv-artifacts/trunk@884 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 07 Apr 2010 07:49:12 +0000
parents c4156275c1e1
children feae2f9d6c6f
rev   line source
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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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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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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
802
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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
802
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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
802
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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
802
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222 /**
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223 * Returns a index -&gt; 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
802
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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
802
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253 /**
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254 * Returns a index -&gt; 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 */
465
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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
499
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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
802
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296 /**
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297 * Empties internal temporary data structures to save some memory.
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298 */
465
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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 :
http://dive4elements.wald.intevation.org