Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/JTSMultiPolygonProducer.java @ 495:6e8364e766fa

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Generate JTS geometries of "Horizontalschnitte" correctly. gnv-artifacts/trunk@572 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 19 Jan 2010 14:06:10 +0000
parents f7038820df2e
children 4080b57dcb52
rev   line source
465
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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diff changeset
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 new GeometryFactory(
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70 new PrecisionModel(
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71 PrecisionModel.FLOATING),
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72 SRID_WGS84,
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73 new PackedCoordinateSequenceFactory(
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74 PackedCoordinateSequenceFactory.DOUBLE,
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75 2));
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76 }
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77
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78 public void handleRings(
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79 List<Edge> rings,
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80 int value,
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81 int width,
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82 int height
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83 ) {
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84 if (value == -1) {
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85 return;
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86 }
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87
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88 Integer v = Integer.valueOf(value);
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89
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90 ArrayList<Polygon> polygons = valueToPolygons.get(v);
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91
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92 if (polygons == null) {
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93 valueToPolygons.put(v, polygons = new ArrayList<Polygon>());
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94 }
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95
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96 double b1 = minX;
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97 double m1 = width != 1
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98 ? (maxX - minX)/(width-1)
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99 : 0d;
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100
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101 double b2 = minY;
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102 double m2 = height != 1
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103 ? (maxY - minY)/(height-1)
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104 : 0d;
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105
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106 ArrayList<Coordinate> vertices = new ArrayList<Coordinate>();
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107
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108 LinearRing shell = null;
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109 ArrayList<LinearRing> holes = new ArrayList<LinearRing>();
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110
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111 for (Edge head: rings) {
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112 Edge current = head;
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113 do {
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114 vertices.add(new Coordinate(
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115 m1*(current.a % width) + b1,
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116 m2*(current.a / width) + b2));
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117 }
495
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118 while ((current = current.prev) != head);
465
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119 vertices.add(new Coordinate(
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120 m1*(head.a % width) + b1,
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121 m2*(head.a / width) + b2));
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122
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123 Coordinate [] coordinates =
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124 vertices.toArray(new Coordinate[vertices.size()]);
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125
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126 vertices.clear();
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127
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128 LinearRing ring = geometryFactory.createLinearRing(
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129 coordinates);
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130
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131 if (CGAlgorithms.isCCW(coordinates)) {
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132 shell = ring;
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133 }
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134 else {
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135 holes.add(ring);
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136 }
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137 }
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138
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139 if (shell == null) {
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140 log.error("polygon has no shell");
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141 return;
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142 }
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143
495
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144 log.debug("polygon has a shell");
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145
465
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146 Polygon polygon = geometryFactory.createPolygon(
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147 shell,
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148 holes.toArray(new LinearRing[holes.size()]));
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149
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150 polygons.add(polygon);
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151 }
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152
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153 public Map<Integer, MultiPolygon> getMultiPolygons() {
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154 return getMultiPolygons(null);
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155 }
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156
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157 public Map<Integer, MultiPolygon> getMultiPolygons(
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158 ValueConverter valueConverter
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159 ) {
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160 TreeMap<Integer, MultiPolygon> multiPolygons =
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161 new TreeMap<Integer, MultiPolygon>();
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162
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163 for (Map.Entry<Integer, ArrayList<Polygon>> entry:
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164 valueToPolygons.entrySet()
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165 ) {
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166 ArrayList<Polygon> polygons = entry.getValue();
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167
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168 Integer value = valueConverter != null
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169 ? valueConverter.convert(entry.getKey())
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170 : entry.getKey();
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171
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172 multiPolygons.put(
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173 value,
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174 geometryFactory.createMultiPolygon(
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175 polygons.toArray(new Polygon[polygons.size()])));
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176 }
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177
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178 return multiPolygons;
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179 }
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180
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181 public void clear() {
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182 valueToPolygons.clear();
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183 }
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184 }
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185 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org