Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/JTSMultiPolygonProducer.java @ 498:4080b57dcb52

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Upgraded to Geotools 2.5.8. Write polygons and line strings to shape files. gnv-artifacts/trunk@578 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 19 Jan 2010 21:23:28 +0000
parents 6e8364e766fa
children e065a72f6b62
rev   line source
465
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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1 package de.intevation.gnv.raster;
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2
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3 import java.util.Map;
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4 import java.util.List;
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5 import java.util.HashMap;
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6 import java.util.TreeMap;
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7 import java.util.ArrayList;
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8
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9 import com.vividsolutions.jts.geom.GeometryFactory;
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10 import com.vividsolutions.jts.geom.MultiPolygon;
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11 import com.vividsolutions.jts.geom.Polygon;
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12 import com.vividsolutions.jts.geom.Coordinate;
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13 import com.vividsolutions.jts.geom.LinearRing;
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14 import com.vividsolutions.jts.geom.PrecisionModel;
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15
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16 import com.vividsolutions.jts.algorithm.CGAlgorithms;
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17
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18 import com.vividsolutions.jts.geom.impl.PackedCoordinateSequenceFactory;
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19
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20 import org.apache.log4j.Logger;
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21
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22 import de.intevation.gnv.raster.Vectorizer.Edge;
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23
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24 /**
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25 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
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26 */
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27 public class JTSMultiPolygonProducer
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28 extends AbstractProducer
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29 {
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30 private static Logger log = Logger.getLogger(
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31 JTSMultiPolygonProducer.class);
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32
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33 public static final int SRID_WGS84 = 4326;
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34
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35 public interface ValueConverter {
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36
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37 Integer convert(Integer value);
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38
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39 } // interface ValueConverter
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40
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41 protected GeometryFactory geometryFactory;
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42
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43 protected HashMap<Integer, ArrayList<Polygon>> valueToPolygons;
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44
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45 public JTSMultiPolygonProducer() {
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46 }
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47
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48 public JTSMultiPolygonProducer(
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49 double minX, double minY,
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50 double maxX, double maxY
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51 ) {
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52 this(
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53 createDefaultGeometryFactory(),
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54 minX, minY,
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55 maxX, maxY);
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56 }
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57
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58 public JTSMultiPolygonProducer(
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59 GeometryFactory geometryFactory,
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60 double minX, double minY,
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61 double maxX, double maxY
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62 ) {
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63 super(minX, minY, maxX, maxY);
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64 this.geometryFactory = geometryFactory;
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65 valueToPolygons = new HashMap<Integer, ArrayList<Polygon>>();
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66 }
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67
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68 public static GeometryFactory createDefaultGeometryFactory() {
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69 return createDefaultGeometryFactory(2);
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70 }
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71
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72 public static GeometryFactory createDefaultGeometryFactory(int dim) {
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73 return new GeometryFactory(
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74 new PrecisionModel(
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75 PrecisionModel.FLOATING),
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76 SRID_WGS84,
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77 new PackedCoordinateSequenceFactory(
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78 PackedCoordinateSequenceFactory.DOUBLE,
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79 dim));
465
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80 }
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81
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82 public void handleRings(
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83 List<Edge> rings,
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84 int value,
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85 int width,
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86 int height
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87 ) {
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88 if (value == -1) {
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89 return;
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90 }
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91
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92 Integer v = Integer.valueOf(value);
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93
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94 ArrayList<Polygon> polygons = valueToPolygons.get(v);
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95
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96 if (polygons == null) {
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97 valueToPolygons.put(v, polygons = new ArrayList<Polygon>());
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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
6e8364e766fa Generate JTS geometries of "Horizontalschnitte" correctly.
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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
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152 polygons.add(polygon);
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153 }
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154
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155 public Map<Integer, MultiPolygon> getMultiPolygons() {
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156 return getMultiPolygons(null);
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157 }
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158
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159 public Map<Integer, MultiPolygon> getMultiPolygons(
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160 ValueConverter valueConverter
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161 ) {
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162 TreeMap<Integer, MultiPolygon> multiPolygons =
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163 new TreeMap<Integer, MultiPolygon>();
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164
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165 for (Map.Entry<Integer, ArrayList<Polygon>> entry:
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166 valueToPolygons.entrySet()
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167 ) {
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168 ArrayList<Polygon> polygons = entry.getValue();
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169
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170 Integer value = valueConverter != null
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171 ? valueConverter.convert(entry.getKey())
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172 : entry.getKey();
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173
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174 multiPolygons.put(
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175 value,
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176 geometryFactory.createMultiPolygon(
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177 polygons.toArray(new Polygon[polygons.size()])));
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178 }
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179
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180 return multiPolygons;
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181 }
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182
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183 public void clear() {
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184 valueToPolygons.clear();
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185 }
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186 }
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187 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org