Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/IsoPolygonSeriesProducer.java @ 447:92b7ccbf6163

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Improved generation of iso lines in vertical cross section. gnv-artifacts/trunk@495 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Fri, 01 Jan 2010 21:52:41 +0000
parents eb2ac62e853a
children 3cb2bea50456
rev   line source
437
b624879d2902 Added vectorizer rings callback to generate iso lines.
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parents:
diff changeset
1 package de.intevation.gnv.raster;
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2
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3 import java.util.List;
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4 import java.util.HashSet;
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5 import java.util.HashMap;
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6 import java.util.ArrayList;
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7 import java.util.Collection;
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8
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9 import org.apache.log4j.Logger;
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10
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11 import gnu.trove.TIntHashSet;
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12 import gnu.trove.TIntObjectHashMap;
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13 import gnu.trove.TDoubleArrayList;
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14 import gnu.trove.TObjectProcedure;
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15
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16 import de.intevation.gnv.raster.Vectorizer.RingsHandler;
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17 import de.intevation.gnv.raster.Vectorizer.Edge;
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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.jfreechart.PolygonSeries;
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22 import de.intevation.gnv.jfreechart.CompactXYItems;
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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 IsoPolygonSeriesProducer
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28 implements RingsHandler
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29 {
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30 private static Logger log = Logger.getLogger(
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31 IsoPolygonSeriesProducer.class);
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32
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33 public static final Float LINE_WIDTH = Float.valueOf(0.1f);
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34
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35 public interface LabelGenerator {
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36
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37 String generateLabel(int neighbor1, int neighbor2);
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38
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39 } // interface LabelGenerator
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40
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41 protected HashMap<Edge, Integer> open;
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42 protected HashMap<IJKey, TIntObjectHashMap> commonOpen;
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43 protected HashMap<IJKey, ArrayList<Edge>> complete;
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44
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45 protected int width;
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46 protected int height;
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47
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48 protected double minX;
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49 protected double minY;
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50 protected double maxX;
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51 protected double maxY;
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52
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53 public IsoPolygonSeriesProducer(
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54 double minX, double minY,
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55 double maxX, double maxY
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56 ) {
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57 this.minX = minX;
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58 this.minY = minY;
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59 this.maxX = maxX;
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60 this.maxY = maxY;
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61
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62 open = new HashMap<Edge, Integer>();
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63 commonOpen = new HashMap<IJKey, TIntObjectHashMap>();
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64 complete = new HashMap<IJKey, ArrayList<Edge>>();
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65 }
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66
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67 public void handleRings(
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68 List<Edge> rings,
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69 int value,
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70 int width,
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71 int height
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72 ) {
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73 if (value == -1) {
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74 return;
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75 }
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76 this.width = width;
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77 this.height = height;
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78
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79 Integer v = Integer.valueOf(value);
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80
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81 for (Edge head: rings) {
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82 Edge current = head;
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83 do {
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84 Integer neighbor = open.remove(current);
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85
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86 if (neighbor != null) {
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87 IJKey pair = new IJKey(value, neighbor.intValue());
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88 pair.sort();
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89
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90 TIntObjectHashMap co = commonOpen.get(pair);
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91
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92 if (co == null) {
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93 commonOpen.put(pair, co = new TIntObjectHashMap());
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94 }
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95
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96 Edge edge = new Edge(current);
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97
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98 Edge otherA = (Edge)co.remove(edge.a);
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99 if (otherA != null) {
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100 otherA.chain(edge, edge.a);
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101 }
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102
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103 Edge otherB = (Edge)co.remove(edge.b);
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104 if (otherB != null) {
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105 otherB.chain(edge, edge.b);
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106 }
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107
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108 if (edge.isComplete()) {
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109 ArrayList list = complete.get(pair);
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110 if (list == null) {
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111 complete.put(pair, list = new ArrayList());
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112 }
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113 list.add(Vectorizer.simplify(edge, width));
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114 }
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115 else {
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116 if (otherA == null) {
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117 co.put(edge.a, edge);
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118 }
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119 if (otherB == null) {
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120 co.put(edge.b, edge);
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121 }
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122 }
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123 }
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124 else {
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125 Edge edge = new Edge(current.b, current.a);
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126 open.put(edge, v);
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127 }
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128
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129 current = current.next;
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130 }
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131 while (current != head);
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132 } // for all rings
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133
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134 } // handleRings
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135
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136 public Collection<PolygonSeries> getSeries() {
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137 return getSeries(null);
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138 }
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139
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140 public Collection<PolygonSeries> getSeries(LabelGenerator labelGenerator) {
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141
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142 ArrayList<PolygonSeries> series = new ArrayList<PolygonSeries>();
447
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143
437
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144 double b1 = minX;
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145 double m1 = width != 1
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146 ? (maxX - minX)/(width-1)
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147 : 0d;
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148
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149 double b2 = minY;
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150 double m2 = height != 1
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151 ? (maxY - minY)/(height-1)
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152 : 0d;
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153
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154 // join keys of complete and open polygons
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155 HashSet<IJKey> pairs = new HashSet<IJKey>();
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156 for (IJKey key: complete.keySet()) {
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157 pairs.add(key);
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158 }
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159 for (IJKey key: commonOpen.keySet()) {
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160 pairs.add(key);
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161 }
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162
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163 TDoubleArrayList vertices = new TDoubleArrayList();
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164
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165 for (IJKey key: pairs) {
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166 PolygonSeries ps = new PolygonSeries();
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167
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168 // process complete
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169 ArrayList<Edge> completeList = complete.get(key);
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170 if (completeList != null) {
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171 for (Edge head: completeList) {
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172 Edge current = head;
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173 do {
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174 vertices.add(m1*(current.a % width) + b1);
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175 vertices.add(m2*(current.a / width) + b2);
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176 }
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177 while ((current = current.next) != head);
447
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178 // add head again to close shape
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179 vertices.add(m1*(head.a % width) + b1);
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180 vertices.add(m2*(head.a / width) + b2);
437
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181 ps.addRing(new CompactXYItems(vertices.toNativeArray()));
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182 vertices.clear();
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183 }
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184 }
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185
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186 // process open
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187 TIntObjectHashMap map = commonOpen.get(key);
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188
437
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189 if (map != null) {
447
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190 final ArrayList<Edge> headList = new ArrayList<Edge>();
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191 map.forEachValue(new TObjectProcedure() {
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192 TIntHashSet headSet = new TIntHashSet();
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193 public boolean execute(Object value) {
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194 Edge head = ((Edge)value).head();
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195 if (headSet.add(head.a)) {
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196 headList.add(head);
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197 }
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198 return true;
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199 }
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200 });
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201
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202 for (Edge head: headList) {
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203
437
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204 head = Vectorizer.simplify(head, width);
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205 Edge current = head, last = head;
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206 do {
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207 vertices.add(m1*(current.a % width) + b1);
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208 vertices.add(m2*(current.a / width) + b2);
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209 last = current;
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210 }
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211 while ((current = current.next) != null);
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212 // add b from tail
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213 vertices.add(m1*(last.b % width) + b1);
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214 vertices.add(m2*(last.b / width) + b2);
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215 ps.addRing(new CompactXYItems(vertices.toNativeArray()));
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216 vertices.clear();
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217 } // for all in common open
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218 } // if map defined for key
447
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219
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220 int itemCount = ps.getItemCount();
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221
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222 if (itemCount > 0) {
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223 series.add(ps);
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diff changeset
224 if (labelGenerator != null) {
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225 ps.setAttribute(
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226 "label",
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diff changeset
227 labelGenerator.generateLabel(key.i, key.j));
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228 }
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229 ps.setAttribute("line.width", LINE_WIDTH);
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230 }
437
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231 } // for all pairs
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232
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233 return series;
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234 }
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235 }
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236 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org