Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/IsoProducer.java @ 1119:7c4f81f74c47

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merged gnv-artifacts
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:14:00 +0200
parents f953c9a559d8
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
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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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10
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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 gnu.trove.TIntHashSet;
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16 import gnu.trove.TIntObjectHashMap;
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17 import gnu.trove.TObjectProcedure;
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18
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19 import java.util.ArrayList;
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20 import java.util.HashMap;
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21 import java.util.HashSet;
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22 import java.util.List;
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23
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24 /**
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25 * Vectorizer backend to generate iso lines as line strings
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26 * and custom labels on the chart.
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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 IsoProducer
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31 extends AbstractProducer
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32 {
801
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33 /**
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34 * Iso lines separate two neighbors. This interface decouples
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35 * the generation of a suitable label for these to neighbors.
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36 */
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37 public interface AttributeGenerator {
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38
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39 /**
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40 * Generate attribute show as label for two given neighbors.
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41 * @param neighbor1 The first neighbor.
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42 * @param neighbor2 The second neighbor.
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43 * @return The label attribute.
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44 */
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45 Object generateAttribute(int neighbor1, int neighbor2);
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46
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47 } // interface AttributeGenerator
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48
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49 /**
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50 * Internal map of open edge to neighbor attributes.
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51 */
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52 protected HashMap<Edge, Integer> open;
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53 /**
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54 * Internal map to associate neighbors with open edges.
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55 */
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56 protected HashMap<IJKey, TIntObjectHashMap> commonOpen;
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57 /**
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58 * Internal map to associate neighbors with complete rings.
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59 */
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60 protected HashMap<IJKey, ArrayList<Edge>> complete;
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61
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62 /**
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63 * Width of the index space.
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64 */
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65 protected int width;
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66 /**
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67 * Height of the index space.
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68 */
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69 protected int height;
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70
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71 /**
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72 * Constructor with a given world bounding box.
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73 * @param minX Min x coord of the world.
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74 * @param minY Min y coord of the world.
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75 * @param maxX Max x coord of the world.
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76 * @param maxY Max y coord of the world.
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77 */
465
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78 public IsoProducer(
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79 double minX, double minY,
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80 double maxX, double maxY
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81 ) {
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82 super(minX, minY, maxX, maxY);
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83
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84 open = new HashMap<Edge, Integer>();
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85 commonOpen = new HashMap<IJKey, TIntObjectHashMap>();
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86 complete = new HashMap<IJKey, ArrayList<Edge>>();
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87 }
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88
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89 public void handleRings(
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90 List<Edge> rings,
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91 int value,
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92 int width,
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93 int height
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94 ) {
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95 if (value == -1) {
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96 return;
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97 }
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98 this.width = width;
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99 this.height = height;
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100
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101 Integer v = Integer.valueOf(value);
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102
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103 for (Edge head: rings) {
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104 Edge current = head;
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105 do {
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106 Integer neighbor = open.remove(current);
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107
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108 if (neighbor != null) {
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109 IJKey pair = new IJKey(value, neighbor.intValue());
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110 pair.sort();
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111
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112 TIntObjectHashMap co = commonOpen.get(pair);
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113
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114 if (co == null) {
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115 commonOpen.put(pair, co = new TIntObjectHashMap());
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116 }
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117
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118 Edge edge = new Edge(current);
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119
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120 Edge otherA = (Edge)co.remove(edge.a);
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121 if (otherA != null) {
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122 otherA.chain(edge, edge.a);
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123 }
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124
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125 Edge otherB = (Edge)co.remove(edge.b);
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126 if (otherB != null) {
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127 otherB.chain(edge, edge.b);
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128 }
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129
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130 if (edge.isComplete()) {
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131 ArrayList list = complete.get(pair);
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132 if (list == null) {
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133 complete.put(pair, list = new ArrayList());
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134 }
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135 list.add(Vectorizer.simplify(edge, width));
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136 }
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137 else {
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138 if (otherA == null) {
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139 co.put(edge.a, edge);
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140 }
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141 if (otherB == null) {
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142 co.put(edge.b, edge);
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143 }
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144 }
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145 }
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146 else {
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147 Edge edge = new Edge(current.b, current.a);
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148 open.put(edge, v);
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149 }
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150
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151 current = current.next;
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152 }
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153 while (current != head);
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154 } // for all rings
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155
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156 } // handleRings
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157
801
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158 /**
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159 * Join the pairs of neighbors i,j to have a distinct set.
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160 * @return The distinct pairs of neighbors.
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161 */
465
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162 protected HashSet<IJKey> joinPairs() {
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163 HashSet<IJKey> pairs = new HashSet<IJKey>();
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164 pairs.addAll(complete .keySet());
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165 pairs.addAll(commonOpen.keySet());
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166 return pairs;
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167 }
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168
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169 /**
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170 * Filter out the head list from the open edge lists.
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171 * @param map Map of end and head lists.
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172 * @return list of only head lists.
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173 */
465
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174 protected static ArrayList<Edge> headList(TIntObjectHashMap map) {
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175 final ArrayList<Edge> headList = new ArrayList<Edge>();
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176 map.forEachValue(new TObjectProcedure() {
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177 TIntHashSet headSet = new TIntHashSet();
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178 public boolean execute(Object value) {
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179 Edge head = ((Edge)value).head();
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180 if (headSet.add(head.a)) {
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181 headList.add(head);
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182 }
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183 return true;
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184 }
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185 });
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186 return headList;
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187 }
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188
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189 /**
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190 * Reset internal data structures to save some memory.
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191 */
465
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192 public void clear() {
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193 open.clear();
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194 complete.clear();
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195 commonOpen.clear();
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196 }
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197 }
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198 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org