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annotate dwtx/draw2d/graph/Edge.d @ 192:c3583c6ec027

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Added missing default cases for switch statements
author Frank Benoit <benoit@tionex.de>
date Mon, 03 Nov 2008 22:52:26 +0100
parents 95307ad235d9
children
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1 /*******************************************************************************
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2 * Copyright (c) 2003, 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.Edge;
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14
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15 import dwt.dwthelper.utils;
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16
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17 import dwtx.draw2d.geometry.Point;
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18 import dwtx.draw2d.geometry.PointList;
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19 import dwtx.draw2d.graph.NodeList;
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20 import dwtx.draw2d.graph.Node;
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21
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22 /**
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23 * A directed Edge joining a source and target Node. Edges indicate the dependencies
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24 * between nodes. An Edge provides the information needed to perform a graph layout, and
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25 * it stores the result of the layout in its various field. Therefore, it functions
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26 * both as input and output. The input data consists of:
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27 * <UL>
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28 * <LI>{@link #source} - the source Node
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29 * <LI>{@link #target} - the target Node
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30 * <LI>{@link #delta} - the minimum number of rows the edge should span
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31 * <LI>{@link #weight} - a hint indicating this edge's importance
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32 * <LI>{@link #width} - the edge's width
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33 * <LI>{@link #padding} - the amount of space to leave on either side of the edge
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34 * <LI>[{@link #offsetSource}] - the edge's attachment point at the source node
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35 * <LI>[{@link #offsetTarget}] - the edge's attachment point at the target node
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36 * </UL>
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37 * <P>The output of a layout consists of bending longer edges, and potentially inverting
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38 * edges to remove cycles in the graph. The output consists of:
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39 * <UL>
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40 * <LI>{@link #vNodes} - the virtual nodes (if any) which make up the bendpoints
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41 * <LI>{@link #isFeedback} - <code>true</code> if the edge points backwards
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42 * </UL>
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43 *
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44 * @author hudsonr
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45 * @since 2.1.2
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46 */
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47 public class Edge {
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48
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49 int cut;
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50
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51 /**
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52 * An arbitrary data field for use by clients.
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53 */
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54 public Object data;
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55
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56 /**
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57 * The minimum rank separation between the source and target nodes. The default value is
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58 * 1.
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59 * @deprecated use accessors instead
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60 */
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61 public int delta = 1;
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62
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63 /**
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64 * The ending point.
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65 * @deprecated use {@link #getPoints()}
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66 */
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67 public Point end;
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68
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69 bool flag;
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70
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71 /**
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72 * @deprecated INTERNAL field, use accessor method
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73 * Indicates an edge was inverted during the layout
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74 */
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75 public bool isFeedback_ = false;
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76
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77 /**
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78 * The edge's attachment point at the <em>source</em> node. The default value is -1, which
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79 * indicates that the edge should use the node's default {@link Node#getOffsetOutgoing()
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80 * outgoing} attachment point.
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81 * @deprecated use accessors instead
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82 */
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83 public int offsetSource = -1;
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84
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85 /**
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86 * The edge's attachment point at the <em>target</em> node. The default value is -1, which
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87 * indicates that the edge should use the node's default {@link Node#getOffsetIncoming()
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88 * incoming} attachment point.
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89 * @deprecated use accessors instead
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90 */
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91 public int offsetTarget = -1;
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92
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93 /**
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94 * The minimum amount of space to leave on both the left and right sides of the edge.
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95 * @deprecated use accessors instead
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96 */
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97 public int padding = 10;
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98
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99 private PointList points;
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100
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101 /**
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102 * The source Node.
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103 */
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104 public Node source;
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105 /**
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106 * The starting point.
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107 * @deprecated use {@link #getPoints()}
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108 */
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109 public Point start;
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110
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111 /**
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112 * The target Node.
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113 */
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114 public Node target;
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115
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116 bool tree;
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117
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118 /**
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119 * The virtual nodes used to bend edges which go across one or more ranks. Each virtual
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120 * node is just a regular node which occupies some small amount of space on a row. It's
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121 * width is equivalent to the edge's width. Clients can use each virtual node's location
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122 * (x, y, width, and height) as the way to position an edge which spans multiple rows.
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123 */
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124 public NodeList vNodes;
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125 /**
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126 * A hint indicating how straight and short the edge should be relative to
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127 * other edges in the graph. The default value is <code>1</code>.
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128 */
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129 public int weight = 1;
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130
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131 /**
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132 * @deprecated use accessors instead
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133 */
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134 public int width = 1;
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135
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136 /**
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137 * Constructs a new edge with the given source and target nodes. All other fields will
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138 * have their default values.
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139 * @param source the source Node
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140 * @param target the target Node
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141 */
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142 public this(Node source, Node target) {
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143 this(null, source, target);
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144 }
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145
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146 /**
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147 * Constructs a new edge with the given source, target, delta, and weight.
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148 * @param source the source Node
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149 * @param target the target Node
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150 * @param delta the minimum edge span
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151 * @param weight the weight hint
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152 */
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153 public this(Node source, Node target, int delta, int weight) {
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154 this(source, target);
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155 this.delta = delta;
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156 this.weight = weight;
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157 }
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158
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159 /**
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160 * Constructs a new edge with the given data object, source, and target node.
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161 * @param data an arbitrary data object
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162 * @param source the source node
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163 * @param target the target node
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164 */
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165 public this(Object data, Node source, Node target) {
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166 this.data = data;
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167 this.source = source;
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168 this.target = target;
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169 source.outgoing.add(this);
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170 target.incoming.add(this);
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171 }
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172
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173 /**
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174 * Returns the delta value. The delta is the minimum rank separation for the edge's source
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175 * and target nodes.
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176 * @return the delta.
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177 * @since 3.2
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178 */
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179 public int getDelta() {
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180 return delta;
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181 }
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182
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183 /**
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184 * For internal use only. Returns the index of the {@link Node} (or {@link VirtualNode})
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185 * on this edge at the given rank. If this edge doesn't have a node at the given rank, -1
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186 * is returned.
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187 * @param rank the rank
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188 * @return the edges index at the given rank
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189 */
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190 int getIndexForRank(int rank) {
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191 if (source.rank is rank)
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192 return source.index;
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193 if (target.rank is rank)
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194 return target.index;
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195 if (vNodes !is null)
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196 return vNodes.getNode(rank - source.rank - 1).index;
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197 return -1;
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198 }
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199
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200 /**
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201 * For internal use only. Returns the target node's row minus the source node's row.
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202 * @return the distance from the source to target ranks
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203 */
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204 public int getLength() {
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205 return (target.rank - source.rank);
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206 }
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207
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208 public int getPadding() {
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209 return padding;
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210 }
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211
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212 /**
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213 * Returns the path connecting the edge's source and target.
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214 * @return a point list
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215 * @since 3.2
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216 */
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217 public PointList getPoints() {
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218 return points;
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219 }
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220
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221 int getSlack() {
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222 return (target.rank - source.rank) - delta;
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223 }
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224
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225 /**
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226 * Returns the effective source offset for this edge. The effective source offset is
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227 * either the {@link #offsetSource} field, or the source node's default outgoing offset if
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228 * that field's value is -1.
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229 * @return the source offset
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230 */
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231 public int getSourceOffset() {
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232 if (offsetSource !is -1)
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233 return offsetSource;
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234 return source.getOffsetOutgoing();
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235 }
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236
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237 /**
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238 * Returns the effective target offset for this edge. The effective target offset is
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239 * either the {@link #offsetTarget} field, or the target node's default incoming offset if
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240 * that field's value is -1.
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241 * @return the target offset
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242 */
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243 public int getTargetOffset() {
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244 if (offsetTarget !is -1)
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245 return offsetTarget;
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246 return target.getOffsetIncoming();
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247 }
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248
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249 public int getWidth() {
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250 return width;
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251 }
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252
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253 /**
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254 * Swaps the source and target nodes. If any positional data has been calculated, it is
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255 * inverted as well to reflect the new direction.
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256 * @since 2.1.2
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257 */
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258 public void invert() {
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259 source.outgoing.remove(this);
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260 target.incoming.remove(this);
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261
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262 Node oldTarget = target;
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263 target = source;
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264 source = oldTarget;
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265
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266 int temp = offsetSource;
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267 offsetSource = offsetTarget;
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268 offsetTarget = temp;
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269
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270 target.incoming.add(this);
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271 source.outgoing.add(this);
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272
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273 if (points !is null)
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274 points.reverse();
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275
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276 if (vNodes !is null) {
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277 NodeList newVNodes = new NodeList();
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278 for (int j = vNodes.size() - 1; j >= 0; j--) {
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279 newVNodes.add(vNodes.getNode(j));
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280 }
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281 vNodes = newVNodes;
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282 }
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283
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284 if (start !is null) {
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285 Point pt = start;
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286 start = end;
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287 end = pt;
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288 }
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289 }
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290
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291 /**
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292 * Returns <code>true</code> if the edge was a feedback edge. The layout algorithm may
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293 * invert one or more edges to remove all cycles from the input. The set of edges that are
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294 * inverted are referred to as the "feedback" set.
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295 * @return <code>true</code> if the edge is feedback
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296 * @since 3.2
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297 */
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298 public bool isFeedback() {
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299 return isFeedback_;
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300 }
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301
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302 /**
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303 * For internal use only. Returns the node opposite the given node on this edge.
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304 * @param end one end
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305 * @return the other end
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306 */
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307 public Node opposite(Node end) {
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308 if (source is end)
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309 return target;
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310 return source;
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311 }
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312
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313 /**
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314 * Sets the delta value.
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315 * @param delta the new delta value
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316 * @since 3.2
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317 */
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318 public void setDelta(int delta) {
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319 this.delta = delta;
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320 }
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321
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322 /**
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323 * Sets the padding for this edge.
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324 * @param padding the padding
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325 * @since 3.2
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326 */
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327 public void setPadding(int padding) {
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328 this.padding = padding;
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329 }
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330
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331 void setPoints(PointList points) {
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332 this.points = points;
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333 start = points.getFirstPoint();
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334 end = points.getLastPoint();
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335 }
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336
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337 /**
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338 * Sets the source node and adds this edge to the new source's outgoing edges. If the
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339 * source node is previously set, removes this edge from the old source's outgoing edges.
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340 * @param node the new source
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341 * @since 3.2
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342 */
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343 public void setSource(Node node) {
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344 if (source is node)
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345 return;
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346 if (source !is null)
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347 source.outgoing.remove(this);
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348 source = node;
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349 if (source !is null)
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350 source.outgoing.add(this);
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351 }
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352
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353 public void setSourceOffset(int offset) {
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354 this.offsetSource = offset;
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355 }
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356
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357 /**
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358 * Sets the target node and adds this edge to the new target's incoming edges. If the
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359 * target node is previously set, removes this edge from the old target's incoming edges.
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360 * @param node the new target
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361 * @since 3.2
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362 */
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363 public void setTarget(Node node) {
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364 if (target is node)
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365 return;
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366 if (target !is null)
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367 target.incoming.remove(this);
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368 target = node;
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369 if (target !is null)
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370 target.incoming.add(this);
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371 }
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372
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373 public void setTargetOffset(int offset) {
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374 this.offsetTarget = offset;
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375 }
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376
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377 /**
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378 * Sets the width of the edge.
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379 * @param width the new width
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380 * @since 3.2
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381 */
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382 public void setWidth(int width) {
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383 this.width = width;
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384 }
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385
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386 }