Mercurial > projects > dwt2
annotate org.eclipse.draw2d/src/org/eclipse/draw2d/ShortestPathConnectionRouter.d @ 16:dbfb303e8fb0
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author | Frank Benoit <benoit@tionex.de> |
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date | Wed, 18 Mar 2009 08:56:47 +0100 |
parents | bc29606a740c |
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rev | line source |
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1 /******************************************************************************* |
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2 * Copyright (c) 2000, 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 org.eclipse.draw2d.ShortestPathConnectionRouter; |
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14 |
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15 import java.lang.all; |
16
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16 import java.util.Collections; |
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17 import java.util.HashSet; |
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18 import java.util.HashMap; |
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19 import java.util.Set; |
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20 import java.util.Iterator; |
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21 import java.util.List; |
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22 import java.util.Map; |
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23 |
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24 import org.eclipse.draw2d.geometry.Point; |
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25 import org.eclipse.draw2d.geometry.PointList; |
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26 import org.eclipse.draw2d.geometry.PrecisionPoint; |
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27 import org.eclipse.draw2d.geometry.Rectangle; |
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28 import org.eclipse.draw2d.graph.Path; |
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29 import org.eclipse.draw2d.graph.ShortestPathRouter; |
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30 import org.eclipse.draw2d.AbstractRouter; |
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31 import org.eclipse.draw2d.IFigure; |
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32 import org.eclipse.draw2d.LayoutListener; |
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33 import org.eclipse.draw2d.FigureListener; |
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34 import org.eclipse.draw2d.Connection; |
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35 import org.eclipse.draw2d.Bendpoint; |
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36 |
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37 /** |
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38 * Routes multiple connections around the children of a given container figure. |
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39 * @author Whitney Sorenson |
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40 * @author Randy Hudson |
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41 * @since 3.1 |
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42 */ |
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43 public final class ShortestPathConnectionRouter |
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44 : AbstractRouter |
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45 { |
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46 |
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47 private class LayoutTracker : LayoutListenerStub { |
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48 public void postLayout(IFigure container) { |
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49 processLayout(); |
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50 } |
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51 public void remove(IFigure child) { |
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52 removeChild(child); |
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53 } |
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54 public void setConstraint(IFigure child, Object constraint) { |
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55 addChild(child); |
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56 } |
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57 } |
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58 |
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59 private Map constraintMap; |
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60 private Map figuresToBounds; |
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61 private Map connectionToPaths; |
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62 private bool isDirty; |
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63 private ShortestPathRouter algorithm; |
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64 private IFigure container; |
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65 private Set staleConnections; |
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66 private LayoutListener listener; |
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67 |
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68 private FigureListener figureListener; |
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69 private void initFigureListener(){ |
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70 figureListener = new class() FigureListener { |
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71 public void figureMoved(IFigure source) { |
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72 Rectangle newBounds = source.getBounds().getCopy(); |
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73 if (algorithm.updateObstacle(cast(Rectangle)figuresToBounds.get(cast(Object)source), newBounds)) { |
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74 queueSomeRouting(); |
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75 isDirty = true; |
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76 } |
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77 |
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78 figuresToBounds.put(cast(Object)source, newBounds); |
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79 } |
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80 }; |
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81 } |
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82 private bool ignoreInvalidate; |
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83 |
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84 /** |
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85 * Creates a new shortest path router with the given container. The container |
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86 * contains all the figure's which will be treated as obstacles for the connections to |
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87 * avoid. Any time a child of the container moves, one or more connections will be |
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88 * revalidated to process the new obstacle locations. The connections being routed must |
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89 * not be contained within the container. |
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90 * |
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91 * @param container the container |
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92 */ |
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93 public this(IFigure container) { |
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94 initFigureListener(); |
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95 constraintMap = new HashMap(); |
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96 algorithm = new ShortestPathRouter(); |
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97 staleConnections = new HashSet(); |
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98 listener = new LayoutTracker(); |
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99 isDirty = false; |
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100 algorithm = new ShortestPathRouter(); |
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101 this.container = container; |
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102 } |
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103 |
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104 void addChild(IFigure child) { |
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105 if (connectionToPaths is null) |
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106 return; |
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107 if (figuresToBounds.containsKey(cast(Object)child)) |
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108 return; |
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109 Rectangle bounds = child.getBounds().getCopy(); |
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110 algorithm.addObstacle(bounds); |
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111 figuresToBounds.put(cast(Object)child, bounds); |
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112 child.addFigureListener(figureListener); |
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113 isDirty = true; |
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114 } |
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115 |
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116 private void hookAll() { |
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117 figuresToBounds = new HashMap(); |
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118 for (int i = 0; i < container.getChildren().size(); i++) |
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119 addChild(cast(IFigure)container.getChildren().get(i)); |
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120 container.addLayoutListener(listener); |
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121 } |
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122 |
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123 private void unhookAll() { |
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124 container.removeLayoutListener(listener); |
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125 if (figuresToBounds !is null) { |
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126 Iterator figureItr = figuresToBounds.keySet().iterator(); |
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127 while (figureItr.hasNext()) { |
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128 //Must use iterator's remove to avoid concurrent modification |
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129 IFigure child = cast(IFigure)figureItr.next(); |
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130 figureItr.remove(); |
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131 removeChild(child); |
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132 } |
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133 figuresToBounds = null; |
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134 } |
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135 } |
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136 |
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137 /** |
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138 * Gets the constraint for the given {@link Connection}. The constraint is the paths |
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139 * list of bend points for this connection. |
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140 * |
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141 * @param connection The connection whose constraint we are retrieving |
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142 * @return The constraint |
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143 */ |
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144 public Object getConstraint(Connection connection) { |
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145 return constraintMap.get(cast(Object)connection); |
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146 } |
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147 |
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148 /** |
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149 * Returns the default spacing maintained on either side of a connection. The default |
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150 * value is 4. |
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151 * @return the connection spacing |
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152 * @since 3.2 |
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153 */ |
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154 public int getSpacing() { |
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155 return algorithm.getSpacing(); |
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156 } |
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157 |
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158 /** |
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159 * @see ConnectionRouter#invalidate(Connection) |
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160 */ |
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161 public void invalidate(Connection connection) { |
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162 if (ignoreInvalidate) |
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163 return; |
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164 staleConnections.add(cast(Object)connection); |
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165 isDirty = true; |
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166 } |
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167 |
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168 private void processLayout() { |
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169 if (staleConnections.isEmpty()) |
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170 return; |
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171 (cast(Connection)staleConnections.iterator().next()).revalidate(); |
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172 } |
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173 |
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174 private void processStaleConnections() { |
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175 Iterator iter = staleConnections.iterator(); |
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176 if (iter.hasNext() && connectionToPaths is null) { |
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177 connectionToPaths = new HashMap(); |
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178 hookAll(); |
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179 } |
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180 |
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181 while (iter.hasNext()) { |
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182 Connection conn = cast(Connection)iter.next(); |
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183 |
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184 Path path = cast(Path)connectionToPaths.get(cast(Object)conn); |
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185 if (path is null) { |
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186 path = new Path(cast(Object)conn); |
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187 connectionToPaths.put(cast(Object)conn, path); |
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188 algorithm.addPath(path); |
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189 } |
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190 |
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191 List constraint = cast(List)getConstraint(conn); |
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192 if (constraint is null) |
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193 constraint = Collections.EMPTY_LIST; |
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194 |
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195 Point start = conn.getSourceAnchor().getReferencePoint().getCopy(); |
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196 Point end = conn.getTargetAnchor().getReferencePoint().getCopy(); |
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197 |
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198 container.translateToRelative(start); |
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199 container.translateToRelative(end); |
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200 |
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201 path.setStartPoint(start); |
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202 path.setEndPoint(end); |
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203 |
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204 if (!constraint.isEmpty()) { |
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205 PointList bends = new PointList(constraint.size()); |
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206 for (int i = 0; i < constraint.size(); i++) { |
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207 Bendpoint bp = cast(Bendpoint)constraint.get(i); |
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208 bends.addPoint(bp.getLocation()); |
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209 } |
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210 path.setBendPoints(bends); |
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211 } else |
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212 path.setBendPoints(null); |
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213 |
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214 isDirty |= path.isDirty; |
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215 } |
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216 staleConnections.clear(); |
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217 } |
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218 |
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219 void queueSomeRouting() { |
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220 if (connectionToPaths is null || connectionToPaths.isEmpty()) |
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221 return; |
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222 try { |
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223 ignoreInvalidate = true; |
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224 (cast(Connection)connectionToPaths.keySet().iterator().next()) |
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225 .revalidate(); |
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226 } finally { |
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227 ignoreInvalidate = false; |
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228 } |
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229 } |
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230 |
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231 /** |
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232 * @see ConnectionRouter#remove(Connection) |
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233 */ |
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234 public void remove(Connection connection) { |
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235 staleConnections.remove(cast(Object)connection); |
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236 constraintMap.remove(cast(Object)connection); |
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237 if (connectionToPaths is null) |
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238 return; |
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239 Path path = cast(Path)connectionToPaths.remove(cast(Object)connection); |
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240 algorithm.removePath(path); |
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241 isDirty = true; |
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242 if (connectionToPaths.isEmpty()) { |
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243 unhookAll(); |
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244 connectionToPaths = null; |
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245 } else { |
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246 //Make sure one of the remaining is revalidated so that we can re-route again. |
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247 queueSomeRouting(); |
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248 } |
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249 } |
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250 |
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251 void removeChild(IFigure child) { |
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252 if (connectionToPaths is null) |
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253 return; |
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254 Rectangle bounds = child.getBounds().getCopy(); |
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255 bool change = algorithm.removeObstacle(bounds); |
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256 figuresToBounds.remove(cast(Object)child); |
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257 child.removeFigureListener(figureListener); |
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258 if (change) { |
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259 isDirty = true; |
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260 queueSomeRouting(); |
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261 } |
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262 } |
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263 |
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264 /** |
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265 * @see ConnectionRouter#route(Connection) |
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266 */ |
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267 public void route(Connection conn) { |
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268 if (isDirty) { |
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269 ignoreInvalidate = true; |
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270 processStaleConnections(); |
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271 isDirty = false; |
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272 List updated = algorithm.solve(); |
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273 Connection current; |
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274 for (int i = 0; i < updated.size(); i++) { |
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275 Path path = cast(Path) updated.get(i); |
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276 current = cast(Connection)path.data; |
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277 current.revalidate(); |
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278 |
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279 PointList points = path.getPoints().getCopy(); |
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280 Point ref1, ref2, start, end; |
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281 ref1 = new PrecisionPoint(points.getPoint(1)); |
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282 ref2 = new PrecisionPoint(points.getPoint(points.size() - 2)); |
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283 current.translateToAbsolute(ref1); |
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284 current.translateToAbsolute(ref2); |
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285 |
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286 start = current.getSourceAnchor().getLocation(ref1).getCopy(); |
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287 end = current.getTargetAnchor().getLocation(ref2).getCopy(); |
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288 |
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289 current.translateToRelative(start); |
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290 current.translateToRelative(end); |
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291 points.setPoint(start, 0); |
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292 points.setPoint(end, points.size() - 1); |
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293 |
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294 current.setPoints(points); |
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295 } |
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296 ignoreInvalidate = false; |
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297 } |
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298 } |
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299 |
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300 /** |
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301 * @see ConnectionRouter#setConstraint(Connection, Object) |
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302 */ |
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303 public void setConstraint(Connection connection, Object constraint) { |
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304 //Connection.setConstraint() already calls revalidate, so we know that a |
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305 // route() call will follow. |
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306 staleConnections.add(cast(Object)connection); |
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307 constraintMap.put(cast(Object)connection, constraint); |
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308 isDirty = true; |
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309 } |
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310 |
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311 /** |
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312 * Sets the default space that should be maintained on either side of a connection. This |
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313 * causes the connections to be separated from each other and from the obstacles. The |
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314 * default value is 4. |
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315 * |
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316 * @param spacing the connection spacing |
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317 * @since 3.2 |
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318 */ |
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319 public void setSpacing(int spacing) { |
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320 algorithm.setSpacing(spacing); |
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321 } |
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322 |
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323 } |