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annotate dwtx/draw2d/graph/Vertex.d @ 98:95307ad235d9

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Added Draw2d code, still work in progress
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 00:52:14 +0200
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98
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1 /*******************************************************************************
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2 * Copyright (c) 2004, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwtx.draw2d.graph.Vertex;
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14
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15 import tango.text.convert.Format;
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16 import dwt.dwthelper.utils;
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17 import dwtx.dwtxhelper.Collection;
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18
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19 import dwtx.draw2d.PositionConstants;
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20 import dwtx.draw2d.geometry.Point;
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21 import dwtx.draw2d.geometry.Rectangle;
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22 import dwtx.draw2d.graph.Obstacle;
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23 import dwtx.draw2d.graph.Path;
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24 import dwtx.draw2d.graph.Segment;
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25
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26 /**
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27 * A vertex representation for the ShortestPathRouting. Vertices are either one of
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28 * four corners on an <code>Obstacle</code>(Rectangle), or one of the two end points of a
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29 * <code>Path</code>.
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30 *
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31 * This class is not intended to be subclassed.
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32 * @author Whitney Sorenson
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33 * @since 3.0
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34 */
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35 class Vertex
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36 : Point
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37 {
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38
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39 // constants for the vertex type
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40 static const int NOT_SET = 0;
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41 static const int INNIE = 1;
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42 static const int OUTIE = 2;
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43
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44 // for shortest path
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45 List neighbors;
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46 bool isPermanent = false;
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47 Vertex label;
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48 double cost = 0;
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49
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50 // for routing
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51 int nearestObstacle = 0;
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52 double offset = 0;
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53 int type = NOT_SET;
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54 int count = 0;
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55 int totalCount = 0;
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56 Obstacle obs;
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57 List paths;
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58 bool nearestObstacleChecked = false;
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59 Map cachedCosines;
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60 int positionOnObstacle = -1;
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61
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62 private int origX, origY;
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63
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64 /**
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65 * Creates a new Vertex with the given x, y position and on the given obstacle.
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66 *
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67 * @param x x point
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68 * @param y y point
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69 * @param obs obstacle - can be null
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70 */
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71 this(int x, int y, Obstacle obs) {
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72 super(x, y);
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73 origX = x;
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74 origY = y;
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75 this.obs = obs;
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76 }
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77
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78 /**
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79 * Creates a new Vertex with the given point position and on the given obstacle.
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80 *
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81 * @param p the point
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82 * @param obs obstacle - can be null
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83 */
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84 this(Point p, Obstacle obs) {
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85 this(p.x, p.y, obs);
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86 }
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87
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88 /**
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89 * Adds a path to this vertex, calculates angle between two segments and caches it.
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90 *
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91 * @param path the path
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92 * @param start the segment to this vertex
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93 * @param end the segment away from this vertex
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94 */
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95 void addPath(Path path, Segment start, Segment end) {
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96 if (paths is null) {
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97 paths = new ArrayList();
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98 cachedCosines = new HashMap();
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99 }
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100 if (!paths.contains(path))
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101 paths.add(path);
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102 cachedCosines.put(path, new Double(start.cosine(end)));
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103 }
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104
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105 /**
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106 * Creates a point that represents this vertex offset by the given amount times
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107 * the offset.
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108 *
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109 * @param modifier the offset
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110 * @return a Point that has been bent around this vertex
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111 */
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112 Point bend(int modifier) {
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113 Point point = new Point(x, y);
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114 if ((positionOnObstacle & PositionConstants.NORTH) > 0)
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115 point.y -= modifier * offset;
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116 else
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117 point.y += modifier * offset;
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118 if ((positionOnObstacle & PositionConstants.EAST) > 0)
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119 point.x += modifier * offset;
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120 else
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121 point.x -= modifier * offset;
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122 return point;
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123 }
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124
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125 /**
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126 * Resets all fields on this Vertex.
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127 */
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128 void fullReset() {
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129 totalCount = 0;
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130 type = NOT_SET;
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131 count = 0;
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132 cost = 0;
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133 offset = getSpacing();
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134 nearestObstacle = 0;
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135 label = null;
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136 nearestObstacleChecked = false;
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137 isPermanent = false;
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138 if (neighbors !is null)
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139 neighbors.clear();
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140 if (cachedCosines !is null)
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141 cachedCosines.clear();
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142 if (paths !is null)
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143 paths.clear();
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144 }
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145
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146 /**
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147 * Returns a Rectangle that represents the region around this vertex that
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148 * paths will be traveling in.
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149 *
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150 * @param extraOffset a buffer to add to the region.
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151 * @return the rectangle
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152 */
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153 Rectangle getDeformedRectangle(int extraOffset) {
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154 Rectangle rect = new Rectangle(0, 0, 0, 0);
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155
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156 if ((positionOnObstacle & PositionConstants.NORTH) > 0) {
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157 rect.y = y - extraOffset;
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158 rect.height = origY - y + extraOffset;
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159 } else {
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160 rect.y = origY;
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161 rect.height = y - origY + extraOffset;
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162 }
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163 if ((positionOnObstacle & PositionConstants.EAST) > 0) {
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164 rect.x = origX;
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165 rect.width = x - origX + extraOffset;
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166 } else {
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167 rect.x = x - extraOffset;
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168 rect.width = origX - x + extraOffset;
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169 }
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170
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171 return rect;
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172 }
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173
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174 private int getSpacing() {
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175 if (obs is null)
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176 return 0;
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177 return obs.getSpacing();
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178 }
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179
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180 /**
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181 * Grows this vertex by its offset to its maximum size.
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182 */
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183 void grow() {
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184 int modifier;
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185
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186 if (nearestObstacle is 0)
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187 modifier = totalCount * getSpacing();
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188 else
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189 modifier = (nearestObstacle / 2) - 1;
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190
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191 if ((positionOnObstacle & PositionConstants.NORTH) > 0)
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192 y -= modifier;
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193 else
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194 y += modifier;
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195 if ((positionOnObstacle & PositionConstants.EAST) > 0)
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196 x += modifier;
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197 else
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198 x -= modifier;
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199 }
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200
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201 /**
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202 * Shrinks this vertex to its original size.
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203 */
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204 void shrink() {
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205 x = origX;
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206 y = origY;
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207 }
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208
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209 /**
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210 * Updates the offset of this vertex based on its shortest distance.
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211 */
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212 void updateOffset() {
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213 if (nearestObstacle !is 0)
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214 offset = ((nearestObstacle / 2) - 1) / totalCount;
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215 }
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216
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217 /**
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218 * @see dwtx.draw2d.geometry.Point#toString()
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219 */
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220 public String toString() {
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221 return Format("V({}, {})", origX, origY ); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
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222 }
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223
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224 }