Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/IsoPolygonSeriesProducer.java @ 437:b624879d2902

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Added vectorizer rings callback to generate iso lines. gnv-artifacts/trunk@485 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sun, 27 Dec 2009 05:25:40 +0000
parents
children eb2ac62e853a
rev   line source
437
b624879d2902 Added vectorizer rings callback to generate iso lines.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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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.Map;
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5 import java.util.HashSet;
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6 import java.util.HashMap;
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7 import java.util.ArrayList;
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8 import java.util.Collection;
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9
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10 import gnu.trove.TIntObjectHashMap;
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11 import gnu.trove.TDoubleArrayList;
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12 import gnu.trove.TIntObjectIterator;
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13
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14 import de.intevation.gnv.raster.Vectorizer.RingsHandler;
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15 import de.intevation.gnv.raster.Vectorizer.Edge;
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16
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17 import de.intevation.gnv.math.IJKey;
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18
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19 import de.intevation.gnv.jfreechart.PolygonSeries;
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20 import de.intevation.gnv.jfreechart.CompactXYItems;
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21
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22 /**
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23 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
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24 */
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25 public class IsoPolygonSeriesProducer
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26 implements RingsHandler
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27 {
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28 public interface LabelGenerator {
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29
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30 String generateLabel(int neighbor1, int neighbor2);
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31
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32 } // interface LabelGenerator
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33
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34 protected HashMap<Edge, Integer> open;
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35 protected HashMap<IJKey, TIntObjectHashMap> commonOpen;
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36 protected HashMap<IJKey, ArrayList<Edge>> complete;
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37
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38 protected int width;
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39 protected int height;
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40
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41 protected double minX;
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42 protected double minY;
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43 protected double maxX;
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44 protected double maxY;
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45
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46 public IsoPolygonSeriesProducer(
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47 double minX, double minY,
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48 double maxX, double maxY
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49 ) {
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50 this.minX = minX;
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51 this.minY = minY;
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52 this.maxX = maxX;
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53 this.maxY = maxY;
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54
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55 open = new HashMap<Edge, Integer>();
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56 commonOpen = new HashMap<IJKey, TIntObjectHashMap>();
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57 complete = new HashMap<IJKey, ArrayList<Edge>>();
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58 }
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59
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60 public void handleRings(
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61 List<Edge> rings,
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62 int value,
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63 int width,
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64 int height
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65 ) {
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66 if (value == -1) {
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67 return;
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68 }
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69 this.width = width;
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70 this.height = height;
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71
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72 Integer v = Integer.valueOf(value);
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73
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74 for (Edge head: rings) {
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75 Edge current = head;
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76 do {
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77 Integer neighbor = open.remove(current);
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78
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79 if (neighbor != null) {
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80 IJKey pair = new IJKey(value, neighbor.intValue());
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81 pair.sort();
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82
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83 TIntObjectHashMap co = commonOpen.get(pair);
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84
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85 if (co == null) {
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86 commonOpen.put(pair, co = new TIntObjectHashMap());
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87 }
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88
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89 Edge edge = new Edge(current);
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90
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91 Edge otherA = (Edge)co.remove(edge.a);
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92 if (otherA != null) {
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93 otherA.chain(edge, edge.a);
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94 }
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95
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96 Edge otherB = (Edge)co.remove(edge.b);
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97 if (otherB != null) {
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98 otherB.chain(edge, edge.b);
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99 }
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100
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101 if (edge.isComplete()) {
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102 ArrayList list = complete.get(pair);
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103 if (list == null) {
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104 complete.put(pair, list = new ArrayList());
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105 }
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106 list.add(Vectorizer.simplify(edge, width));
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107 }
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108 else {
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109 if (otherA == null) {
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110 co.put(edge.a, edge);
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111 }
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112 if (otherB == null) {
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113 co.put(edge.b, edge);
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114 }
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115 }
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116 }
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117 else {
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118 Edge edge = new Edge(current.b, current.a);
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119 open.put(edge, v);
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120 }
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121
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122 current = current.next;
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123 }
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124 while (current != head);
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125 } // for all rings
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126
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127 } // handleRings
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128
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129 public Collection<PolygonSeries> getSeries() {
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130 return getSeries(null);
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131 }
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132
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133 public Collection<PolygonSeries> getSeries(LabelGenerator labelGenerator) {
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134
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135 ArrayList<PolygonSeries> series = new ArrayList<PolygonSeries>();
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136 double b1 = minX;
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137 double m1 = width != 1
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138 ? (maxX - minX)/(width-1)
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139 : 0d;
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140
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141 double b2 = minY;
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142 double m2 = height != 1
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143 ? (maxY - minY)/(height-1)
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144 : 0d;
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145
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146 // join keys of complete and open polygons
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147 HashSet<IJKey> pairs = new HashSet<IJKey>();
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148 for (IJKey key: complete.keySet()) {
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149 pairs.add(key);
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150 }
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151 for (IJKey key: commonOpen.keySet()) {
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152 pairs.add(key);
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153 }
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154
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155 TDoubleArrayList vertices = new TDoubleArrayList();
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156
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157 for (IJKey key: pairs) {
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158 PolygonSeries ps = new PolygonSeries();
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159 series.add(ps);
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160
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161 if (labelGenerator != null) {
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162 ps.setAttribute(
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163 "label",
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164 labelGenerator.generateLabel(key.i, key.j));
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165 }
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166
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167 // process complete
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168 ArrayList<Edge> completeList = complete.get(key);
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169 if (completeList != null) {
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170 for (Edge head: completeList) {
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171 Edge current = head;
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172 do {
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173 vertices.add(m1*(current.a % width) + b1);
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174 vertices.add(m2*(current.a / width) + b2);
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175 }
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176 while ((current = current.next) != head);
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177 // TODO: Do we need to copy b of the tail?
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178 ps.addRing(new CompactXYItems(vertices.toNativeArray()));
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179 vertices.clear();
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180 }
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181 }
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182
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183 // process open
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184 TIntObjectHashMap map = commonOpen.get(key);
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185 if (map != null) {
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186 for (TIntObjectIterator it = map.iterator(); it.hasNext();) {
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187 it.advance();
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188 int k = it.key();
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189 Edge head = (Edge)it.value();
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190 // ignore tails
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191 if ((head.next == null && head.prev != null)
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192 || (head.next == null && head.prev == null && head.b == k)) {
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193 continue;
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194 }
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195 head = Vectorizer.simplify(head, width);
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196 Edge current = head, last = head;
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197 do {
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198 vertices.add(m1*(current.a % width) + b1);
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199 vertices.add(m2*(current.a / width) + b2);
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200 last = current;
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201 }
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202 while ((current = current.next) != null);
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203 // add b from tail
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204 vertices.add(m1*(last.b % width) + b1);
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205 vertices.add(m2*(last.b / width) + b2);
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206 ps.addRing(new CompactXYItems(vertices.toNativeArray()));
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207 vertices.clear();
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208 } // for all in common open
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209 } // if map defined for key
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210 } // for all pairs
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211
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212 return series;
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213 }
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214 }
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215 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org