Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/Vectorizer.java @ 1062:58b4a07db856

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Cach improvement: remove the cached elements of each visited state that is visited while stepping back to a previous state. gnv-artifacts/trunk@1147 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 02 Jun 2010 09:52:39 +0000
parents d766fe2d917a
children f953c9a559d8
rev   line source
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1 package de.intevation.gnv.raster;
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2
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3 import gnu.trove.TIntObjectHashMap;
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4 import gnu.trove.TIntStack;
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5
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6 import java.util.ArrayList;
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7 import java.util.BitSet;
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8 import java.util.List;
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9
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10 import org.apache.log4j.Logger;
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11
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12 /**
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13 * Instances of this class are able to vectorize 2D integer arrays
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14 * with a kind of flood filling regions detection mechanism to
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15 * a set of line strings and polygons.
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16 *
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17 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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18 */
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19 public class Vectorizer
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20 {
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21 private static Logger log = Logger.getLogger(Vectorizer.class);
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22
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23 /**
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24 * Callback to process the found line strings and polygons.
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25 */
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26 public interface RingsHandler {
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27
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28 /**
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29 * Called from {@link #process(de.intevation.gnv.raster.Vectorizer.RingsHandler) }
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30 * to give the found features to the postprocessing backend.
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31 * @param rings The found line strings and polygons.
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32 * @param value The integer value of the raster surrounded by
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33 * the features.
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34 * @param width The width of the index space of the vectorized data.
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35 * @param height The height of the index space of the vectorized data.
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36 */
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37 void handleRings(
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38 List<Edge> rings,
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39 int value,
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40 int width,
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41 int height);
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42
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43 } // interface RingsHandler
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44
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45 /**
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46 * Doubly link list representing a line string or a polygon.
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47 */
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48 public static final class Edge {
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49
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50 /**
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51 * The predecessor.
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52 */
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53 public Edge prev;
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54 /**
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55 * The successor.
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56 */
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57 public Edge next;
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58
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59 /**
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60 * Index of first vertex. To separate x and y values
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61 * you have to divide the value by the width of the
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62 * index space.
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63 */
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64 public int a;
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65 /**
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66 * Index of second vertex. To separate x and y values
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67 * you have to divide the value by the width of the
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68 * index space.
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69 */
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70 public int b;
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71
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72 /**
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73 * Default constructor.
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74 */
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75 public Edge() {
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76 }
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78 /**
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79 * Constructor to create Edge with two vertices.
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80 * @param a The first vertex.
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81 * @param b The second vertex.
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82 */
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83 public Edge(int a, int b) {
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84 this.a = a;
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85 this.b = b;
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86 }
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87
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88 /**
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89 * Copy constructor
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90 * @param other The edge to clone.
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91 */
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92 public Edge(Edge other) {
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93 a = other.a;
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94 b = other.b;
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95 }
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97 /**
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98 * Chain a given edge segment to this segment. The
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99 * side of the chaining is determined by a given
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100 * parameter.
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101 * @param other The segment to chain.
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102 * @param found The side to chain.
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103 */
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104 public void chain(Edge other, int found) {
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105
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106 if (found == a) {
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107 other.next = this;
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108 prev = other;
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109 return;
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110 }
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111
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112 if (found == b) {
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113 next = other;
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114 other.prev = this;
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115 return;
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116 }
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117
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118 throw new IllegalStateException("cannot chain");
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119 }
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120
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121 /**
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122 * Tells if the list is complete which means that this
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123 * edge list is a closed polygon.
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124 * @return true if edge list is closed else false.
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125 */
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126 public boolean isComplete() {
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127 Edge current = this;
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128 do {
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129 if (current.prev == null || current.next == null) {
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130 return false;
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131 }
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132 current = current.next;
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133 }
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134 while (current != this);
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135 return true;
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136 }
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137
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138 /**
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139 * Returns the length of this edge list in next direction.
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140 * Segments in prev direction are ignored.
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141 * @return The length of this edge list.
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142 */
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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143 public int length() {
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144 int length = 0;
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145 Edge current = this;
778
9a828e5a2390 Removed trailing whitespace
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146 do { ++length; }
437
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147 while ((current = current.next) != null && current != this);
424
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148 return length;
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149 }
436
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150
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151 /**
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152 * Returns the head node of this edge list.
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153 * @return The head node.
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154 */
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155 public Edge head() {
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156 Edge current = this;
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157 while (current.prev != null) {
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158 current = current.prev;
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159 }
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160 return current;
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161 }
447
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162
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163 /**
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164 * Hashes the two vertex indices to a common value.
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165 * @return The hash value.
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166 */
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167 @Override
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168 public int hashCode() {
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169 return (a << 16) | b;
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170 }
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171
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172 /**
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173 * Two edges are considered equal if they have the same
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174 * a and b vertices.
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175 * @param other The other edge.
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176 * @return true if the edges are equal else false.
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177 */
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178 @Override
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179 public boolean equals(Object other) {
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180 Edge e = (Edge)other;
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181 return a == e.a && b == e.b;
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182 }
424
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183 } // class Edge
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184
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185 /**
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186 * Simplifies a given edge list by removing collinear vertices.
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187 * Attention: The original list is modified.
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188 * @param edge The edge list to simplify.
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189 * @param width The width of the vertex index space.
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190 * @return The simplified list.
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191 */
424
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192 protected static Edge simplify(Edge edge, int width) {
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193
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194 Edge e1 = edge, start = edge;
424
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195
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196 int length = edge.length();
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197
437
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198 if (length < 2) {
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199 return e1;
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200 }
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201
447
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202 Edge e2 = edge.next;
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203
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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204 int count = 0;
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205
21fbd254db71 Added support for converting 2D rasters into polygons.
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206 do {
21fbd254db71 Added support for converting 2D rasters into polygons.
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207 int e1x = e1.a % width;
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208 int e1y = e1.a / width;
447
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diff changeset
209 int e2x = e1.b % width;
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210 int e2y = e1.b / width;
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diff changeset
211 int e3x = e2.b % width;
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diff changeset
212 int e3y = e2.b / width;
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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213
21fbd254db71 Added support for converting 2D rasters into polygons.
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214 if ((e1x == e2x && e2x == e3x && e1x == e3x)
447
92b7ccbf6163 Improved generation of iso lines in vertical cross section.
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parents: 445
diff changeset
215 || (e1y == e2y && e2y == e3y && e1y == e3y)) {
92b7ccbf6163 Improved generation of iso lines in vertical cross section.
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diff changeset
216 e1.b = e2.b;
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diff changeset
217 Edge removed = e1.next;
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diff changeset
218 e1.next = e2.next;
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diff changeset
219 if (e1.next != null) {
92b7ccbf6163 Improved generation of iso lines in vertical cross section.
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diff changeset
220 e1.next.prev = e1;
92b7ccbf6163 Improved generation of iso lines in vertical cross section.
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diff changeset
221 }
92b7ccbf6163 Improved generation of iso lines in vertical cross section.
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diff changeset
222 e2 = e1.next;
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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223 count = 0;
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
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224 --length;
447
92b7ccbf6163 Improved generation of iso lines in vertical cross section.
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diff changeset
225 if (removed == start) {
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diff changeset
226 start = e1;
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diff changeset
227 }
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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228 }
21fbd254db71 Added support for converting 2D rasters into polygons.
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229 else {
21fbd254db71 Added support for converting 2D rasters into polygons.
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230 e1 = e1.next;
21fbd254db71 Added support for converting 2D rasters into polygons.
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231 e2 = e2.next;
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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232 ++count;
21fbd254db71 Added support for converting 2D rasters into polygons.
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233 }
21fbd254db71 Added support for converting 2D rasters into polygons.
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234 }
447
92b7ccbf6163 Improved generation of iso lines in vertical cross section.
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parents: 445
diff changeset
235 while (length > 1 && e2 != null && count < length + 2);
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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236
447
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diff changeset
237 return start;
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
diff changeset
238 }
21fbd254db71 Added support for converting 2D rasters into polygons.
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239
801
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240 /**
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241 * The raster to be traced.
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242 */
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
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243 protected int [] raster;
801
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244 /**
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245 * The width of the raster.
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246 */
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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247 protected int width;
801
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248 /**
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249 * Map of the currently open edges.
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250 */
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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251 protected TIntObjectHashMap openEdges;
801
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252 /**
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253 * List of rings already found.
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254 */
436
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255 protected List<Edge> rings;
801
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256 /**
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257 * Flag to signal if a simplification should be performed
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258 * after a ring is completed.
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259 */
436
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diff changeset
260 protected boolean simplify;
424
21fbd254db71 Added support for converting 2D rasters into polygons.
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parents:
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261
801
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262 /**
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263 * Default constructor. Simplification is turned on.
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264 */
424
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265 public Vectorizer() {
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266 this(true);
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267 }
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268
801
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269 /**
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270 * Constructor to create a vectorized with an explicit
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271 * simplification policy.
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272 * @param simplify Indicates if simplification should be
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273 * used on ring completion.
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274 */
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275 public Vectorizer(boolean simplify) {
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276 openEdges = new TIntObjectHashMap();
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277 rings = new ArrayList<Edge>();
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278 this.simplify = simplify;
424
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279 }
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280
801
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281 /**
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282 * Constructor to create a vectorizer with a given raster and width.
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283 * Simplification is turn on.
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284 * @param raster The raster to be vectorized.
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285 * @param width The width of the raster.
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286 */
424
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287 public Vectorizer(int [] raster, int width) {
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288 this(true, raster, width);
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289 }
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290
801
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291 /**
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292 * Constructor to create a vectorizer with a given raster, width
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293 * and an explicit simplification policy.
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294 * @param simplify Indicates if simplification should be
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295 * used on ring completion.
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296 * @param raster The raster to be vectorized.
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297 * @param width The width of the raster.
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298 */
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299 public Vectorizer(boolean simplify, int [] raster, int width) {
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300 this(simplify);
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301 this.raster = raster;
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302 this.width = width;
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303 }
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304
801
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305 /**
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306 * Returns (x, y+1) for given vertex in index space.
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307 * @param i vertex in index space.
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308 * @param w width of raster.
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309 * @return (x, y+1) in index space.
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310 */
424
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311 public static final int tl(int i, int w) {
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312 int x = i % w;
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313 int y = i / w;
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314 return x + (w + 1)*y;
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315 }
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316
801
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317 /**
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318 * Returns tl(i, w) + 1.
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319 * @param i vertex in index space.
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320 * @param w width of raster.
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321 * @return tl(i, w) + 1.
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322 */
424
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323 public static final int tr(int i, int w) {
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324 return tl(i, w) + 1;
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325 }
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326
801
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327 /**
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328 * Returns tl(i, w) + w + 1.
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329 * @param i vertex in index space.
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330 * @param w width of raster.
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331 * @return tl(i, w) + w + 1.
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332 */
424
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333 public static final int bl(int i, int w) {
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334 return tl(i, w) + w + 1;
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335 }
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336
801
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337 /**
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338 * Returns bl(i, w) + 1.
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339 * @param i vertex in index space.
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340 * @param w width of raster.
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341 * @return bl(i, w) + 1.
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342 */
424
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343 public static final int br(int i, int w) {
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344 return bl(i, w) + 1;
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345 }
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346
801
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347 /**
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348 * Resets open resources after a set of features were found.
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349 */
424
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350 protected void resetRegion() {
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351 openEdges.clear();
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352 rings.clear();
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353 }
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354
801
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355 /**
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356 * Adds an edge to the map of open edges, joins it
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357 * with its direct neighbors of if complete add the
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358 * list to the complete features.
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359 * @param edge
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360 */
424
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361 protected void emit(Edge edge) {
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362
21fbd254db71 Added support for converting 2D rasters into polygons.
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363 Edge otherA = (Edge)openEdges.remove(edge.a);
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364 if (otherA != null) {
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365 otherA.chain(edge, edge.a);
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366 }
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367
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368 Edge otherB = (Edge)openEdges.remove(edge.b);
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369 if (otherB != null) {
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370 otherB.chain(edge, edge.b);
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371 }
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372
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373 if (edge.isComplete()) {
436
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diff changeset
374 rings.add(simplify ? simplify(edge, width + 1) : edge);
424
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375 }
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376 else {
21fbd254db71 Added support for converting 2D rasters into polygons.
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377 if (otherA == null) {
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378 openEdges.put(edge.a, edge);
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379 }
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380 if (otherB == null) {
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381 openEdges.put(edge.b, edge);
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382 }
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383 }
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384 }
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385
801
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386 /**
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387 * Vectorize the raster. The found features are fed into
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388 * the given ring handler.
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389 * @param handler The RingHandler to postprocess the found features.
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390 * @return The number of regions found.
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391 */
424
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392 public int process(RingsHandler handler) {
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393
21fbd254db71 Added support for converting 2D rasters into polygons.
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394 BitSet visited = new BitSet(raster.length);
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
395
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
396 TIntStack stack = new TIntStack();
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
397
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
398 int regions = 0;
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
399
436
6642ab6c583c Added vectorizer rings callback which generates polygon datasets suitable
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 424
diff changeset
400 int height = raster.length / width;
424
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
401
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
402 for (int i = 0; i < raster.length; ++i) {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
403 if (visited.get(i)) {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
404 continue;
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
405 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
406
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
407 ++regions;
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
408
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
409 int currentValue = raster[i];
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
410 visited.set(i);
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
411
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
412 int current = i;
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
413 visited.set(current);
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
414
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
415 for (;;) {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
416 int tl = tl(current, width);
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
417 int tr = tr(current, width);
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
418 int bl = bl(current, width);
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
419 int br = br(current, width);
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
420
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
421 int t = current - width;
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
422
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
423 if (t < 0) {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
424 emit(new Edge(tr, tl));
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
425 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
426 else {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
427 if (raster[t] != currentValue) {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
428 emit(new Edge(tr, tl));
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
429 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
430 else {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
431 if (!visited.get(t)) {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
432 visited.set(t);
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
433 stack.push(t);
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
434 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
435 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
436 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
437
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
438 int b = current + width;
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
439
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
440 if (b >= raster.length) {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
441 emit(new Edge(bl, br));
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
442 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
443 else {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
444 if (raster[b] != currentValue) {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
445 emit(new Edge(bl, br));
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
446 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
447 else {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
448 if (!visited.get(b)) {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
449 visited.set(b);
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
450 stack.push(b);
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
451 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
452 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
453 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
454
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
455 int x = current % width;
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
456
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
457 if (x == 0) {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
458 emit(new Edge(tl, bl));
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
459 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
460 else {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
461 int l = current - 1;
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
462 if (raster[l] != currentValue) {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
463 emit(new Edge(tl, bl));
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
464 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
465 else {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
466 if (!visited.get(l)) {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
467 visited.set(l);
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
468 stack.push(l);
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
469 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
470 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
471 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
472
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
473 if (x == width - 1) {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
474 emit(new Edge(br, tr));
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
475 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
476 else {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
477 int r = current + 1;
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
478 if (raster[r] != currentValue) {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
479 emit(new Edge(br, tr));
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
480 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
481 else {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
482 if (!visited.get(r)) {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
483 visited.set(r);
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
484 stack.push(r);
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
485 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
486 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
487 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
488
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
489 if (stack.size() == 0) {
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
490 break;
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
491 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
492
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
493 current = stack.pop();
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
494 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
495
436
6642ab6c583c Added vectorizer rings callback which generates polygon datasets suitable
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 424
diff changeset
496 handler.handleRings(
778
9a828e5a2390 Removed trailing whitespace
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 447
diff changeset
497 rings,
9a828e5a2390 Removed trailing whitespace
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 447
diff changeset
498 currentValue,
436
6642ab6c583c Added vectorizer rings callback which generates polygon datasets suitable
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 424
diff changeset
499 width + 1,
6642ab6c583c Added vectorizer rings callback which generates polygon datasets suitable
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 424
diff changeset
500 height + 1);
424
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
501
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
502 resetRegion();
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
503 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
504
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
505 return regions;
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
506 }
21fbd254db71 Added support for converting 2D rasters into polygons.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
507 }
798
6cff63d0c434 Fixed vim modeline. Added some Javadoc.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 780
diff changeset
508 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org