Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/JTSMultiLineStringProducer.java @ 499:e065a72f6b62

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Clip "Horizontalschnitte" against given clipping polygon. gnv-artifacts/trunk@579 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 19 Jan 2010 23:01:24 +0000
parents 4080b57dcb52
children 70adafe2b9d5
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
499
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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.GeometryCollection;
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6 import com.vividsolutions.jts.geom.GeometryFactory;
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7 import com.vividsolutions.jts.geom.Polygon;
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8 import com.vividsolutions.jts.geom.LineString;
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9 import com.vividsolutions.jts.geom.MultiLineString;
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10 import com.vividsolutions.jts.geom.TopologyException;
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diff changeset
12 import de.intevation.gnv.math.IJKey;
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13
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14 import de.intevation.gnv.raster.Vectorizer.Edge;
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15
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16 import de.intevation.gnv.utils.Pair;
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17
499
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18 import gnu.trove.TIntObjectHashMap;
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20 import java.util.ArrayList;
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21 import java.util.List;
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22
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23 import org.apache.log4j.Logger;
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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 JTSMultiLineStringProducer
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28 extends IsoProducer
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29 {
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30 private static Logger log = Logger.getLogger(
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31 JTSMultiLineStringProducer.class);
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32
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33 protected GeometryFactory geometryFactory;
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34
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35 protected Polygon clip;
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36
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37 public JTSMultiLineStringProducer(
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38 Polygon clip,
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39 double minX, double minY,
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40 double maxX, double maxY
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41 ) {
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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42 this(
499
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43 clip,
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4080b57dcb52 Upgraded to Geotools 2.5.8. Write polygons and line strings to
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44 // XXX: Geotools crashes if only using a 2d packed data format!
4080b57dcb52 Upgraded to Geotools 2.5.8. Write polygons and line strings to
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45 JTSMultiPolygonProducer.createDefaultGeometryFactory(3),
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46 minX, minY,
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47 maxX, maxY);
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48 }
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49
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50 public JTSMultiLineStringProducer(
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51 Polygon clip,
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52 GeometryFactory geometryFactory,
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53 double minX, double minY,
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54 double maxX, double maxY
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55 ) {
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56 super(minX, minY, maxX, maxY);
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57 this.clip = clip;
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58 this.geometryFactory = geometryFactory;
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59 }
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60
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61 protected void clipLineString(
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62 LineString lineString,
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63 ArrayList<LineString> lineStrings
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64 ) {
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65 if (clip == null) {
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66 lineStrings.add(lineString);
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67 return;
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68 }
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69
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70 if (!lineString.intersects(clip)) {
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71 return;
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72 }
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73
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74 try {
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75 Geometry result = lineString.intersection(clip);
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76
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77 if (result instanceof LineString) {
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78 lineStrings.add((LineString)result);
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79 }
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80 else if (result instanceof MultiLineString) {
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81 MultiLineString mls = (MultiLineString)result;
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82 for (int i = 0, N = mls.getNumGeometries(); i < N; ++i) {
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83 Geometry g = mls.getGeometryN(i);
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84 if (g instanceof LineString) {
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85 lineStrings.add((LineString)g);
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86 }
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87 else {
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88 log.warn("cannot handle geometry " + g.getClass());
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89 }
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90 }
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91 }
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92 else {
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93 log.warn("cannot handle " + result.getClass());
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94 }
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95 }
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96 catch (TopologyException te) {
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97 log.error(te.getLocalizedMessage(), te);
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98 lineStrings.add(lineString);
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99 }
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100 }
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101
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102 public List<Pair<Object, MultiLineString>> getMultiLineStrings(
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103 AttributeGenerator attributeGenerator
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104 ) {
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105 ArrayList<Pair<Object, MultiLineString>> multiLineStrings =
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106 new ArrayList<Pair<Object, MultiLineString>>();
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107
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108 double b1 = minX;
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109 double m1 = width != 1
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110 ? (maxX - minX)/(width-1)
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111 : 0d;
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112
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113 double b2 = minY;
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114 double m2 = height != 1
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115 ? (maxY - minY)/(height-1)
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116 : 0d;
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117
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118 ArrayList<Coordinate> coordinates = new ArrayList<Coordinate>();
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119
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120 for (IJKey key: joinPairs()) {
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121 ArrayList<LineString> lineStrings = new ArrayList<LineString>();
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122
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123 // process complete
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124 ArrayList<Edge> completeList = complete.get(key);
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125 if (completeList != null) {
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126 for (Edge head: completeList) {
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127 Edge current = head;
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128 do {
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129 coordinates.add(new Coordinate(
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130 m1*(current.a % width) + b1,
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131 m2*(current.a / width) + b2));
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132 }
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133 while ((current = current.next) != head);
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134 // add head again to close shape
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135 coordinates.add(new Coordinate(
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136 m1*(head.a % width) + b1,
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137 m2*(head.a / width) + b2));
499
e065a72f6b62 Clip "Horizontalschnitte" against given clipping polygon.
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138
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139 clipLineString(
465
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140 geometryFactory.createLineString(
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141 coordinates.toArray(
499
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142 new Coordinate[coordinates.size()])),
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143 lineStrings);
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144
465
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145 coordinates.clear();
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146 }
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147 }
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148
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149 // process open
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150 TIntObjectHashMap map = commonOpen.get(key);
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151
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152 if (map != null) {
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153 for (Edge head: headList(map)) {
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154
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155 head = Vectorizer.simplify(head, width);
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156 Edge current = head, last = head;
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157 do {
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158 coordinates.add(new Coordinate(
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159 m1*(current.a % width) + b1,
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160 m2*(current.a / width) + b2));
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161 last = current;
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162 }
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163 while ((current = current.next) != null);
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164 // add b from tail
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165 coordinates.add(new Coordinate(
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166 m1*(last.b % width) + b1,
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diff changeset
167 m2*(last.b / width) + b2));
499
e065a72f6b62 Clip "Horizontalschnitte" against given clipping polygon.
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parents: 498
diff changeset
168
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parents: 498
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169 clipLineString(
465
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170 geometryFactory.createLineString(
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171 coordinates.toArray(
499
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parents: 498
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172 new Coordinate[coordinates.size()])),
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parents: 498
diff changeset
173 lineStrings);
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174
465
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175 coordinates.clear();
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176 } // for all in common open
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177 } // if map defined for key
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178
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179 if (!lineStrings.isEmpty()) {
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180 MultiLineString multiLineString =
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181 geometryFactory.createMultiLineString(
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182 lineStrings.toArray(
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diff changeset
183 new LineString[lineStrings.size()]));
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184 lineStrings.clear();
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185 Object attribute = attributeGenerator != null
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parents:
diff changeset
186 ? attributeGenerator.generateAttribute(key.i, key.j)
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187 : key;
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diff changeset
188 multiLineStrings.add(new Pair<Object, MultiLineString>(
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parents:
diff changeset
189 attribute,
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parents:
diff changeset
190 multiLineString));
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parents:
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191 }
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parents:
diff changeset
192 } // for all pairs
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parents:
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193
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parents:
diff changeset
194 return multiLineStrings;
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parents:
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195 }
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parents:
diff changeset
196 }
f7038820df2e Added support to trace rasters to JTS multi polygons and multi line strings.
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parents:
diff changeset
197 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org