Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/JTSMultiPolygonProducer.java @ 778:9a828e5a2390

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Removed trailing whitespace gnv-artifacts/trunk@851 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 29 Mar 2010 07:58:51 +0000
parents 70adafe2b9d5
children c4156275c1e1
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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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 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
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28 */
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29 public class JTSMultiPolygonProducer
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30 extends AbstractProducer
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31 {
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32 private static Logger log = Logger.getLogger(
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33 JTSMultiPolygonProducer.class);
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34
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35 public static final int SRID_WGS84 = 4326;
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36
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37 public interface ValueConverter {
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38
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39 Integer convert(Integer value);
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40
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41 } // interface ValueConverter
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42
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43 protected GeometryFactory geometryFactory;
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44
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45 protected Polygon clip;
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46
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47 protected HashMap<Integer, ArrayList<Polygon>> valueToPolygons;
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48
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49 public JTSMultiPolygonProducer() {
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50 }
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51
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52 public JTSMultiPolygonProducer(
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53 Polygon clip,
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54 double minX, double minY,
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55 double maxX, double maxY
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56 ) {
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57 this(
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58 clip,
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59 createDefaultGeometryFactory(),
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60 minX, minY,
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61 maxX, maxY);
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62 }
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63
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64 public JTSMultiPolygonProducer(
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65 Polygon clip,
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66 GeometryFactory geometryFactory,
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67 double minX, double minY,
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68 double maxX, double maxY
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69 ) {
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70 super(minX, minY, maxX, maxY);
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71 this.clip = clip;
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72 this.geometryFactory = geometryFactory;
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73 valueToPolygons = new HashMap<Integer, ArrayList<Polygon>>();
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74 }
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75
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76 public static GeometryFactory createDefaultGeometryFactory() {
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77 return createDefaultGeometryFactory(3);
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78 }
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79
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80 public static GeometryFactory createDefaultGeometryFactory(int dim) {
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81 return new GeometryFactory(
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82 new PrecisionModel(
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83 PrecisionModel.FLOATING),
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84 SRID_WGS84,
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85 new PackedCoordinateSequenceFactory(
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86 PackedCoordinateSequenceFactory.DOUBLE,
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87 dim));
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88 }
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89
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90 public void handleRings(
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91 List<Edge> rings,
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92 int value,
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93 int width,
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94 int height
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95 ) {
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96 if (value == -1) {
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97 return;
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98 }
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99
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100 double b1 = minX;
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101 double m1 = width != 1
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102 ? (maxX - minX)/(width-1)
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103 : 0d;
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104
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105 double b2 = minY;
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106 double m2 = height != 1
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107 ? (maxY - minY)/(height-1)
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108 : 0d;
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109
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110 ArrayList<Coordinate> vertices = new ArrayList<Coordinate>();
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111
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112 LinearRing shell = null;
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113 ArrayList<LinearRing> holes = new ArrayList<LinearRing>();
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114
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115 for (Edge head: rings) {
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116 Edge current = head;
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117 do {
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118 vertices.add(new Coordinate(
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119 m1*(current.a % width) + b1,
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120 m2*(current.a / width) + b2));
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121 }
495
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122 while ((current = current.prev) != head);
465
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123 vertices.add(new Coordinate(
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124 m1*(head.a % width) + b1,
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125 m2*(head.a / width) + b2));
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126
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127 Coordinate [] coordinates =
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128 vertices.toArray(new Coordinate[vertices.size()]);
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129
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130 vertices.clear();
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131
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132 LinearRing ring = geometryFactory.createLinearRing(
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133 coordinates);
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134
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135 if (CGAlgorithms.isCCW(coordinates)) {
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136 shell = ring;
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137 }
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138 else {
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139 holes.add(ring);
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140 }
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141 }
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142
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143 if (shell == null) {
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144 log.error("polygon has no shell");
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145 return;
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146 }
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147
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148 Polygon polygon = geometryFactory.createPolygon(
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149 shell,
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150 holes.toArray(new LinearRing[holes.size()]));
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151
499
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152 if (clip == null || clip.intersects(polygon)) {
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diff changeset
153 Integer v = Integer.valueOf(value);
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154
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diff changeset
155 ArrayList<Polygon> polygons = valueToPolygons.get(v);
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diff changeset
156
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diff changeset
157 if (polygons == null) {
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diff changeset
158 valueToPolygons.put(v, polygons = new ArrayList<Polygon>());
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diff changeset
159 }
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diff changeset
160
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diff changeset
161 polygons.add(polygon);
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diff changeset
162 }
465
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parents:
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163 }
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parents:
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164
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165 public Map<Integer, MultiPolygon> getMultiPolygons() {
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166 return getMultiPolygons(null);
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parents:
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167 }
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168
499
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169 protected MultiPolygon flattenCollection(Geometry result) {
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170
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diff changeset
171 if (result instanceof MultiPolygon) {
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diff changeset
172 return (MultiPolygon)result;
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173 }
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diff changeset
174
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diff changeset
175 if (result instanceof Polygon) {
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diff changeset
176 return geometryFactory.createMultiPolygon(
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diff changeset
177 new Polygon[] { (Polygon)result });
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178 }
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diff changeset
179
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diff changeset
180 log.warn("cannot handle " + result.getClass());
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181
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diff changeset
182 return null;
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parents: 498
diff changeset
183 }
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diff changeset
184
465
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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185 public Map<Integer, MultiPolygon> getMultiPolygons(
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diff changeset
186 ValueConverter valueConverter
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parents:
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187 ) {
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parents:
diff changeset
188 TreeMap<Integer, MultiPolygon> multiPolygons =
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189 new TreeMap<Integer, MultiPolygon>();
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parents:
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190
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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parents:
diff changeset
191 for (Map.Entry<Integer, ArrayList<Polygon>> entry:
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parents:
diff changeset
192 valueToPolygons.entrySet()
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parents:
diff changeset
193 ) {
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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parents:
diff changeset
194 ArrayList<Polygon> polygons = entry.getValue();
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parents:
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195
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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parents:
diff changeset
196 Integer value = valueConverter != null
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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parents:
diff changeset
197 ? valueConverter.convert(entry.getKey())
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diff changeset
198 : entry.getKey();
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diff changeset
199
499
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parents: 498
diff changeset
200 MultiPolygon mp = geometryFactory.createMultiPolygon(
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parents: 498
diff changeset
201 polygons.toArray(new Polygon[polygons.size()]));
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parents: 498
diff changeset
202
e065a72f6b62 Clip "Horizontalschnitte" against given clipping polygon.
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parents: 498
diff changeset
203 if (clip != null) {
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parents: 498
diff changeset
204 try {
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parents: 498
diff changeset
205 Geometry result = mp.intersection(clip);
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parents: 498
diff changeset
206
e065a72f6b62 Clip "Horizontalschnitte" against given clipping polygon.
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parents: 498
diff changeset
207 MultiPolygon mp2 = flattenCollection(result);
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parents: 498
diff changeset
208
e065a72f6b62 Clip "Horizontalschnitte" against given clipping polygon.
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parents: 498
diff changeset
209 if (mp2 != null) { mp = mp2; }
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parents: 498
diff changeset
210 }
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parents: 498
diff changeset
211 catch (TopologyException te) {
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parents: 498
diff changeset
212 log.error(te.getLocalizedMessage(), te);
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parents: 498
diff changeset
213 }
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parents: 498
diff changeset
214 }
e065a72f6b62 Clip "Horizontalschnitte" against given clipping polygon.
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parents: 498
diff changeset
215 multiPolygons.put(value, mp);
465
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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parents:
diff changeset
216 }
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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parents:
diff changeset
217
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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parents:
diff changeset
218 return multiPolygons;
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parents:
diff changeset
219 }
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
220
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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parents:
diff changeset
221 public void clear() {
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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parents:
diff changeset
222 valueToPolygons.clear();
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parents:
diff changeset
223 }
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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parents:
diff changeset
224 }
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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parents:
diff changeset
225 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org