Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/JTSMultiLineStringProducer.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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11 import com.vividsolutions.jts.geom.Coordinate;
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12 import com.vividsolutions.jts.geom.Geometry;
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13 import com.vividsolutions.jts.geom.GeometryFactory;
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14 import com.vividsolutions.jts.geom.LineString;
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15 import com.vividsolutions.jts.geom.MultiLineString;
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16 import com.vividsolutions.jts.geom.Polygon;
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17 import com.vividsolutions.jts.geom.TopologyException;
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18
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19 import de.intevation.gnv.math.IJKey;
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20
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21 import de.intevation.gnv.raster.Vectorizer.Edge;
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22
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23 import de.intevation.gnv.utils.Pair;
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24
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25 import gnu.trove.TIntObjectHashMap;
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26
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27 import java.util.ArrayList;
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28 import java.util.List;
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29
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30 import org.apache.log4j.Logger;
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31
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32 /**
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33 * Vectorizer backend to generated iso lines in form of
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34 * JTS multi linestrings.
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35 *
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36 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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37 */
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38 public class JTSMultiLineStringProducer
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39 extends IsoProducer
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40 {
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41 private static Logger log = Logger.getLogger(
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42 JTSMultiLineStringProducer.class);
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43
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44 /**
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45 * The JTS geometry factory of this producer.
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46 */
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47 protected GeometryFactory geometryFactory;
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48
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49 /**
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50 * The polygon used to clip the produced multe line strings.
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51 */
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52 protected Polygon clip;
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53
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54 /**
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55 * Constructor to create a JTSMultiLineStringProducer with
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56 * a given clipping polygon and a world bounding box.
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57 * @param clip The clipping polygon.
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58 * @param minX Min x coord of the world.
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59 * @param minY Min y coord of the world.
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60 * @param maxX Max x coord of the world.
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61 * @param maxY Max y coord of the world.
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62 */
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63 public JTSMultiLineStringProducer(
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64 Polygon clip,
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65 double minX, double minY,
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66 double maxX, double maxY
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67 ) {
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68 this(
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69 clip,
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70 // XXX: Geotools crashes if only using a 2d packed data format!
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71 JTSMultiPolygonProducer.createDefaultGeometryFactory(3),
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72 minX, minY,
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73 maxX, maxY);
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74 }
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75
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76 /**
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77 * Constructor to create a JTSMultiLineStringProducer with
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78 * a given clipping polygon, a geometry factory
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79 * and a world bounding box.
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80 * @param clip The clipping polygon.
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81 * @param geometryFactory The geometry factory.
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82 * @param minX Min x coord of the world.
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83 * @param minY Min y coord of the world.
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84 * @param maxX Max x coord of the world.
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85 * @param maxY Max y coord of the world.
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86 */
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87 public JTSMultiLineStringProducer(
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88 Polygon clip,
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89 GeometryFactory geometryFactory,
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90 double minX, double minY,
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91 double maxX, double maxY
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92 ) {
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93 super(minX, minY, maxX, maxY);
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94 this.clip = clip;
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95 this.geometryFactory = geometryFactory;
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96 }
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97
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98 /**
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99 * Clips a given line string against the clippin polygon. The
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100 * result is stored in the given list of line strings.
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101 * @param lineString The line string to be clipped.
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102 * @param lineStrings The result line string list.
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103 */
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104 protected void clipLineString(
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105 LineString lineString,
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106 ArrayList<LineString> lineStrings
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107 ) {
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108 if (clip == null) {
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109 lineStrings.add(lineString);
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110 return;
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111 }
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112
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113 if (!lineString.intersects(clip)) {
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114 return;
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115 }
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116
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117 try {
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118 Geometry result = lineString.intersection(clip);
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119
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120 if (result instanceof LineString) {
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121 lineStrings.add((LineString)result);
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122 }
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123 else if (result instanceof MultiLineString) {
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124 MultiLineString mls = (MultiLineString)result;
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125 for (int i = 0, N = mls.getNumGeometries(); i < N; ++i) {
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126 Geometry g = mls.getGeometryN(i);
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127 if (g instanceof LineString) {
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128 lineStrings.add((LineString)g);
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129 }
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130 else {
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131 log.warn("cannot handle geometry " + g.getClass());
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132 }
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133 }
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134 }
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135 else {
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136 log.warn("cannot handle " + result.getClass());
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137 }
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138 }
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diff changeset
139 catch (TopologyException te) {
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140 log.error(te.getLocalizedMessage(), te);
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141 lineStrings.add(lineString);
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142 }
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143 }
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144
802
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145 /**
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146 * Returns a list of pairs attribute -&gt; multi line string.
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147 * All line strings produced are grouped by there attribute
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148 * which is generated with the given attribute generator.
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149 * @param attributeGenerator The attribute generator.
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150 * @return The list of attribute/multi line strings.
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151 */
465
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152 public List<Pair<Object, MultiLineString>> getMultiLineStrings(
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153 AttributeGenerator attributeGenerator
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154 ) {
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155 ArrayList<Pair<Object, MultiLineString>> multiLineStrings =
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156 new ArrayList<Pair<Object, MultiLineString>>();
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157
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158 double b1 = minX;
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159 double m1 = width != 1
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160 ? (maxX - minX)/(width-1)
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161 : 0d;
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162
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163 double b2 = minY;
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164 double m2 = height != 1
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165 ? (maxY - minY)/(height-1)
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166 : 0d;
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167
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168 ArrayList<Coordinate> coordinates = new ArrayList<Coordinate>();
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169
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170 for (IJKey key: joinPairs()) {
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171 ArrayList<LineString> lineStrings = new ArrayList<LineString>();
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172
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173 // process complete
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174 ArrayList<Edge> completeList = complete.get(key);
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175 if (completeList != null) {
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176 for (Edge head: completeList) {
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177 Edge current = head;
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178 do {
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179 coordinates.add(new Coordinate(
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180 m1*(current.a % width) + b1,
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diff changeset
181 m2*(current.a / width) + b2));
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182 }
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183 while ((current = current.next) != head);
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184 // add head again to close shape
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185 coordinates.add(new Coordinate(
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186 m1*(head.a % width) + b1,
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187 m2*(head.a / width) + b2));
499
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188
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189 clipLineString(
465
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190 geometryFactory.createLineString(
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diff changeset
191 coordinates.toArray(
499
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diff changeset
192 new Coordinate[coordinates.size()])),
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diff changeset
193 lineStrings);
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diff changeset
194
465
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diff changeset
195 coordinates.clear();
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196 }
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parents:
diff changeset
197 }
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parents:
diff changeset
198
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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parents:
diff changeset
199 // process open
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diff changeset
200 TIntObjectHashMap map = commonOpen.get(key);
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diff changeset
201
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parents:
diff changeset
202 if (map != null) {
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parents:
diff changeset
203 for (Edge head: headList(map)) {
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parents:
diff changeset
204
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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parents:
diff changeset
205 head = Vectorizer.simplify(head, width);
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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parents:
diff changeset
206 Edge current = head, last = head;
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parents:
diff changeset
207 do {
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parents:
diff changeset
208 coordinates.add(new Coordinate(
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parents:
diff changeset
209 m1*(current.a % width) + b1,
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parents:
diff changeset
210 m2*(current.a / width) + b2));
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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parents:
diff changeset
211 last = current;
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parents:
diff changeset
212 }
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parents:
diff changeset
213 while ((current = current.next) != null);
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parents:
diff changeset
214 // add b from tail
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parents:
diff changeset
215 coordinates.add(new Coordinate(
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parents:
diff changeset
216 m1*(last.b % width) + b1,
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parents:
diff changeset
217 m2*(last.b / width) + b2));
499
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parents: 498
diff changeset
218
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parents: 498
diff changeset
219 clipLineString(
465
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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parents:
diff changeset
220 geometryFactory.createLineString(
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parents:
diff changeset
221 coordinates.toArray(
499
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parents: 498
diff changeset
222 new Coordinate[coordinates.size()])),
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parents: 498
diff changeset
223 lineStrings);
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diff changeset
224
465
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diff changeset
225 coordinates.clear();
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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parents:
diff changeset
226 } // for all in common open
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parents:
diff changeset
227 } // if map defined for key
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parents:
diff changeset
228
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parents:
diff changeset
229 if (!lineStrings.isEmpty()) {
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diff changeset
230 MultiLineString multiLineString =
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parents:
diff changeset
231 geometryFactory.createMultiLineString(
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parents:
diff changeset
232 lineStrings.toArray(
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parents:
diff changeset
233 new LineString[lineStrings.size()]));
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parents:
diff changeset
234 lineStrings.clear();
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parents:
diff changeset
235 Object attribute = attributeGenerator != null
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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parents:
diff changeset
236 ? attributeGenerator.generateAttribute(key.i, key.j)
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237 : key;
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238 multiLineStrings.add(new Pair<Object, MultiLineString>(
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239 attribute,
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240 multiLineString));
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241 }
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242 } // for all pairs
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243
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244 return multiLineStrings;
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245 }
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246 }
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247 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org