Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/JTSMultiLineStringProducer.java @ 806:2cea76f1112e

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Added Javadoc in utils package. gnv-artifacts/trunk@888 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 08 Apr 2010 13:10:39 +0000
parents feae2f9d6c6f
children f953c9a559d8
rev   line source
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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 com.vividsolutions.jts.geom.Coordinate;
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4 import com.vividsolutions.jts.geom.Geometry;
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5 import com.vividsolutions.jts.geom.GeometryFactory;
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6 import com.vividsolutions.jts.geom.LineString;
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7 import com.vividsolutions.jts.geom.MultiLineString;
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8 import com.vividsolutions.jts.geom.Polygon;
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9 import com.vividsolutions.jts.geom.TopologyException;
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11 import de.intevation.gnv.math.IJKey;
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12
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13 import de.intevation.gnv.raster.Vectorizer.Edge;
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14
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15 import de.intevation.gnv.utils.Pair;
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17 import gnu.trove.TIntObjectHashMap;
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19 import java.util.ArrayList;
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20 import java.util.List;
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21
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22 import org.apache.log4j.Logger;
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23
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24 /**
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25 * Vectorizer backend to generated iso lines in form of
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26 * JTS multi linestrings.
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27 *
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28 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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29 */
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30 public class JTSMultiLineStringProducer
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31 extends IsoProducer
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32 {
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33 private static Logger log = Logger.getLogger(
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34 JTSMultiLineStringProducer.class);
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35
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36 /**
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37 * The JTS geometry factory of this producer.
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38 */
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39 protected GeometryFactory geometryFactory;
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41 /**
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42 * The polygon used to clip the produced multe line strings.
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43 */
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44 protected Polygon clip;
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46 /**
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47 * Constructor to create a JTSMultiLineStringProducer with
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48 * a given clipping polygon and a world bounding box.
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49 * @param clip The clipping polygon.
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50 * @param minX Min x coord of the world.
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51 * @param minY Min y coord of the world.
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52 * @param maxX Max x coord of the world.
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53 * @param maxY Max y coord of the world.
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54 */
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55 public JTSMultiLineStringProducer(
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56 Polygon clip,
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57 double minX, double minY,
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58 double maxX, double maxY
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59 ) {
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60 this(
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61 clip,
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62 // XXX: Geotools crashes if only using a 2d packed data format!
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63 JTSMultiPolygonProducer.createDefaultGeometryFactory(3),
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64 minX, minY,
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65 maxX, maxY);
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66 }
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67
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68 /**
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69 * Constructor to create a JTSMultiLineStringProducer with
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70 * a given clipping polygon, a geometry factory
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71 * and a world bounding box.
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72 * @param clip The clipping polygon.
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73 * @param geometryFactory The geometry factory.
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74 * @param minX Min x coord of the world.
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75 * @param minY Min y coord of the world.
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76 * @param maxX Max x coord of the world.
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77 * @param maxY Max y coord of the world.
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78 */
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79 public JTSMultiLineStringProducer(
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80 Polygon clip,
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81 GeometryFactory geometryFactory,
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82 double minX, double minY,
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83 double maxX, double maxY
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84 ) {
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85 super(minX, minY, maxX, maxY);
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86 this.clip = clip;
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87 this.geometryFactory = geometryFactory;
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88 }
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89
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90 /**
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91 * Clips a given line string against the clippin polygon. The
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92 * result is stored in the given list of line strings.
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93 * @param lineString The line string to be clipped.
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94 * @param lineStrings The result line string list.
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95 */
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96 protected void clipLineString(
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97 LineString lineString,
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98 ArrayList<LineString> lineStrings
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99 ) {
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100 if (clip == null) {
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101 lineStrings.add(lineString);
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102 return;
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103 }
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104
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105 if (!lineString.intersects(clip)) {
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106 return;
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107 }
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108
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109 try {
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110 Geometry result = lineString.intersection(clip);
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111
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112 if (result instanceof LineString) {
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113 lineStrings.add((LineString)result);
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114 }
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115 else if (result instanceof MultiLineString) {
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116 MultiLineString mls = (MultiLineString)result;
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117 for (int i = 0, N = mls.getNumGeometries(); i < N; ++i) {
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118 Geometry g = mls.getGeometryN(i);
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119 if (g instanceof LineString) {
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120 lineStrings.add((LineString)g);
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121 }
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122 else {
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123 log.warn("cannot handle geometry " + g.getClass());
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124 }
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125 }
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126 }
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127 else {
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128 log.warn("cannot handle " + result.getClass());
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129 }
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130 }
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131 catch (TopologyException te) {
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132 log.error(te.getLocalizedMessage(), te);
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133 lineStrings.add(lineString);
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134 }
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135 }
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136
802
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137 /**
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138 * Returns a list of pairs attribute -&gt; multi line string.
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139 * All line strings produced are grouped by there attribute
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140 * which is generated with the given attribute generator.
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141 * @param attributeGenerator The attribute generator.
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142 * @return The list of attribute/multi line strings.
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143 */
465
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144 public List<Pair<Object, MultiLineString>> getMultiLineStrings(
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145 AttributeGenerator attributeGenerator
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146 ) {
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147 ArrayList<Pair<Object, MultiLineString>> multiLineStrings =
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148 new ArrayList<Pair<Object, MultiLineString>>();
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149
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150 double b1 = minX;
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151 double m1 = width != 1
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152 ? (maxX - minX)/(width-1)
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153 : 0d;
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154
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155 double b2 = minY;
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156 double m2 = height != 1
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157 ? (maxY - minY)/(height-1)
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158 : 0d;
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159
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160 ArrayList<Coordinate> coordinates = new ArrayList<Coordinate>();
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161
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162 for (IJKey key: joinPairs()) {
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163 ArrayList<LineString> lineStrings = new ArrayList<LineString>();
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164
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165 // process complete
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166 ArrayList<Edge> completeList = complete.get(key);
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167 if (completeList != null) {
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168 for (Edge head: completeList) {
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169 Edge current = head;
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170 do {
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171 coordinates.add(new Coordinate(
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172 m1*(current.a % width) + b1,
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173 m2*(current.a / width) + b2));
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174 }
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175 while ((current = current.next) != head);
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176 // add head again to close shape
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177 coordinates.add(new Coordinate(
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178 m1*(head.a % width) + b1,
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179 m2*(head.a / width) + b2));
499
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180
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181 clipLineString(
465
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182 geometryFactory.createLineString(
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183 coordinates.toArray(
499
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184 new Coordinate[coordinates.size()])),
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185 lineStrings);
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186
465
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187 coordinates.clear();
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188 }
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parents:
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189 }
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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 // process open
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192 TIntObjectHashMap map = commonOpen.get(key);
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193
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diff changeset
194 if (map != null) {
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195 for (Edge head: headList(map)) {
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196
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diff changeset
197 head = Vectorizer.simplify(head, width);
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198 Edge current = head, last = head;
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199 do {
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diff changeset
200 coordinates.add(new Coordinate(
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diff changeset
201 m1*(current.a % width) + b1,
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parents:
diff changeset
202 m2*(current.a / width) + b2));
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diff changeset
203 last = current;
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204 }
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parents:
diff changeset
205 while ((current = current.next) != null);
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parents:
diff changeset
206 // add b from tail
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parents:
diff changeset
207 coordinates.add(new Coordinate(
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parents:
diff changeset
208 m1*(last.b % width) + b1,
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parents:
diff changeset
209 m2*(last.b / width) + b2));
499
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diff changeset
210
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parents: 498
diff changeset
211 clipLineString(
465
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parents:
diff changeset
212 geometryFactory.createLineString(
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diff changeset
213 coordinates.toArray(
499
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diff changeset
214 new Coordinate[coordinates.size()])),
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parents: 498
diff changeset
215 lineStrings);
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diff changeset
216
465
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diff changeset
217 coordinates.clear();
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parents:
diff changeset
218 } // for all in common open
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parents:
diff changeset
219 } // if map defined for key
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parents:
diff changeset
220
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parents:
diff changeset
221 if (!lineStrings.isEmpty()) {
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diff changeset
222 MultiLineString multiLineString =
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diff changeset
223 geometryFactory.createMultiLineString(
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diff changeset
224 lineStrings.toArray(
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parents:
diff changeset
225 new LineString[lineStrings.size()]));
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diff changeset
226 lineStrings.clear();
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diff changeset
227 Object attribute = attributeGenerator != null
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parents:
diff changeset
228 ? attributeGenerator.generateAttribute(key.i, key.j)
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229 : key;
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diff changeset
230 multiLineStrings.add(new Pair<Object, MultiLineString>(
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parents:
diff changeset
231 attribute,
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diff changeset
232 multiLineString));
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parents:
diff changeset
233 }
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parents:
diff changeset
234 } // for all pairs
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parents:
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235
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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236 return multiLineStrings;
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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237 }
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
238 }
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
239 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org