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annotate dwtx/draw2d/graph/Node.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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1 /*******************************************************************************
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2 * Copyright (c) 2003, 2008 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.Node;
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14
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15 import dwt.dwthelper.utils;
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16 import dwtx.dwtxhelper.Collection;
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17 import tango.text.convert.Format;
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18
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19 import dwtx.draw2d.geometry.Dimension;
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20 import dwtx.draw2d.geometry.Insets;
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21 import dwtx.draw2d.graph.EdgeList;
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22 import dwtx.draw2d.graph.Subgraph;
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23 import dwtx.draw2d.graph.Edge;
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24
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25 /**
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26 * A node in a DirectedGraph. A node has 0 or more incoming and outgoing {@link Edge}s. A
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27 * node is given a width and height by the client. When a layout places the node in the
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28 * graph, it will determine the node's x and y location. It may also modify the node's
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29 * height.
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30 *
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31 * A node represents both the <EM>input</EM> and the <EM>output</EM> for a layout
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32 * algorithm. The following fields are used as input to a graph layout:
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33 * <UL>
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34 * <LI>{@link #width} - the node's width.
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35 * <LI>{@link #height} - the node's height.
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36 * <LI>{@link #outgoing} - the node's outgoing edges.
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37 * <LI>{@link #incoming} - the node's incoming edges.
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38 * <LI>padding - the amount of space to be left around the outside of the node.
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39 * <LI>{@link #incomingOffset} - the default attachment point for incoming edges.
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40 * <LI>{@link #outgoingOffset} - the default attachment point for outgoing edges.
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41 * <LI>parent - the parent subgraph containing this node.
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42 * </UL>
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43 * <P>
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44 * The following fields are calculated by a graph layout and comprise the <EM>output</EM>:
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45 * <UL>
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46 * <LI>{@link #x} - the node's x location
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47 * <LI>{@link #y} - the node's y location
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48 * <LI>{@link #height} - the node's height may be stretched to match the height of other
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49 * nodes
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50 * </UL>
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51 *
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52 * @author Randy Hudson
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53 * @since 2.1.2
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54 */
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55 public class Node {
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56
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57 Node left, right;
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58
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59 Object[] workingData;
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60 int[] workingInts;
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61
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62 /**
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63 * Clients may use this field to mark the Node with an arbitrary data object.
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64 */
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65 public Object data;
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66
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67 //used by various graph visitors
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68 bool flag;
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69
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70 /**
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71 * The height of this node. This value should be set prior to laying out the directed
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72 * graph. Depending on the layout rules, a node's height may be expanded to match the
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73 * height of other nodes around it.
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74 */
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75 public int height = 40;
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76
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77 /**
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78 * @deprecated use {@link #setRowConstraint(int)} and {@link #getRowConstraint()}
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79 */
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80 public int rowOrder = -1;
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81
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82 /**
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83 * The edges for which this node is the target.
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84 */
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85 public EdgeList incoming;
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86
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87 /**
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88 * The default attachment point for incoming edges. <code>-1</code> indicates that the
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89 * node's horizontal center should be used.
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90 */
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91 public int incomingOffset = -1;
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92
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93 // A non-decreasing number given to consecutive nodes in a Rank.
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94 int index;
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95
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96 //Used in Compound graphs to quickly determine whether a node is inside a subgraph.
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97 int nestingIndex = -1;
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98
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99 /**
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100 * The edges for which this node is the source.
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101 */
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102 public EdgeList outgoing;
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103
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104 Insets padding;
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105 private Subgraph parent;
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106 int rank;
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107
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108 /**
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109 * @deprecated for internal use only
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110 */
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111 public double sortValue;
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112
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113 /**
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114 * The node's outgoing offset attachment point.
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115 */
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116 public int outgoingOffset = -1;
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117
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118 /**
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119 * The node's width. The default value is 50.
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120 */
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121 public int width = 50;
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122
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123 /**
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124 * The node's x coordinate.
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125 */
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126 public int x;
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127 /**
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128 * The node's y coordinate.
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129 */
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130 public int y;
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131
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132 /**
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133 * Constructs a new node.
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134 */
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135 public this() { }
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136
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137 /**
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138 * Constructs a node with the given data object
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139 * @param data an arbitrary data object
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140 */
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141 public this(Object data) {
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142 this(data, null);
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143 }
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144
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145 /**
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146 * Constructs a node inside the given subgraph.
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147 * @param parent the parent subgraph
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148 */
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149 public this(Subgraph parent) {
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150 this(null, parent);
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151 }
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152
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153 /**
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154 * Constructs a node with the given data object and parent subgraph. This node is added to
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155 * the set of members for the parent subgraph
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156 * @param data an arbitrary data object
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157 * @param parent the parent subgraph or <code>null</code>
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158 */
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159 public this(Object data, Subgraph parent) {
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160 this.data = data;
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161 this.parent = parent;
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162 incoming = new EdgeList();
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163 outgoing = new EdgeList();
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164 workingData = new Object[3];
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165 workingInts = new int[4];
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166 if (parent !is null)
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167 parent.addMember(this);
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168 }
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169
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170 /**
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171 * Returns the incoming attachment point. This is the distance from the left edge to the
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172 * default incoming attachment point for edges. Each incoming edge may have it's own
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173 * attachment setting which takes priority over this default one.
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174 * @return the incoming offset
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175 */
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176 public int getOffsetIncoming() {
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177 if (incomingOffset is -1)
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178 return width / 2;
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179 return incomingOffset;
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180 }
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181
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182 /**
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183 * Returns the outgoing attachment point. This is the distance from the left edge to the
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184 * default outgoing attachment point for edges. Each outgoing edge may have it's own
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185 * attachment setting which takes priority over this default one.
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186 * @return the outgoing offset
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187 */
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188 public int getOffsetOutgoing() {
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189 if (outgoingOffset is -1)
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190 return width / 2;
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191 return outgoingOffset;
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192 }
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193
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194 /**
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195 * Returns the padding for this node or <code>null</code> if the default padding for the
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196 * graph should be used.
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197 * @return the padding or <code>null</code>
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198 */
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199 public Insets getPadding() {
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200 return padding;
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201 }
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202
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203 /**
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204 * Returns the parent Subgraph or <code>null</code> if there is no parent. Subgraphs are
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205 * only for use in {@link CompoundDirectedGraphLayout}.
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206 * @return the parent or <code>null</code>
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207 */
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208 public Subgraph getParent() {
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209 return parent;
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210 }
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211
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212 /**
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213 * For internal use only. Returns <code>true</code> if the given node is equal to this
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214 * node. This method is implemented for consitency with Subgraph.
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215 * @param node the node in question
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216 * @return <code>true</code> if nested
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217 */
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218 bool isNested(Node node) {
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219 return node is this;
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220 }
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221
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222 /**
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223 * Sets the padding. <code>null</code> indicates that the default padding should be used.
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224 * @param padding an insets or <code>null</code>
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225 */
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226 public void setPadding(Insets padding) {
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227 this.padding = padding;
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228 }
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229
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230 /**
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231 * Sets the parent subgraph. This method should not be called directly. The constructor
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232 * will set the parent accordingly.
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233 * @param parent the parent
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234 */
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235 public void setParent(Subgraph parent) {
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236 this.parent = parent;
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237 }
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238
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239 /**
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240 * Sets the row sorting constraint for this node. By default, a node's constraint is
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241 * <code>-1</code>. If two nodes have different values both >= 0, the node with the
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242 * smaller constraint will be placed to the left of the other node. In all other cases no
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243 * relative placement is guaranteed.
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244 * @param value the row constraint
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245 * @since 3.2
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246 */
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247 public void setRowConstraint(int value) {
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248 this.rowOrder = value;
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249 }
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250
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251 /**
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252 * Returns the row constraint for this node.
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253 * @return the row constraint
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254 * @since 3.2
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255 */
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256 public int getRowConstraint() {
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257 return rowOrder;
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258 }
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259
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260 /**
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261 * Sets the size of this node to the given dimension.
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262 * @param size the new size
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263 * @since 3.2
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264 */
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265 public void setSize(Dimension size) {
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266 width = size.width;
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267 height = size.height;
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268 }
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269
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270 /**
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271 * @see Object#toString()
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272 */
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273 public String toString() {
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274 return Format("N({})", data ); //$NON-NLS-1$ //$NON-NLS-2$
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275 }
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276
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277 Iterator iteratorNeighbors() {
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278 return new class(outgoing) Iterator {
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279 int offset;
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280 EdgeList list;
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281 this(EdgeList a){
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282 list = a;
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283 }
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284 public Object next() {
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285 Edge edge = list.getEdge(offset++);
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286 if (offset < list.size())
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287 return edge.opposite(this.outer);
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288 if (list is outgoing) {
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289 list = incoming;
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290 offset = 0;
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291 } else
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292 list = null;
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293 return edge.opposite(this.outer);
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294 }
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295
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296 public bool hasNext() {
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297 if (list is null)
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298 return false;
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299 if (offset < list.size())
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300 return true;
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301 if (list is outgoing) {
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302 list = incoming;
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303 offset = 0;
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304 }
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305 return offset < list.size();
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306 }
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307
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308 public void remove() {
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309 throw new RuntimeException("Remove not supported"); //$NON-NLS-1$
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310 }
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311 };
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312 }
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313
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314 /**
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315 * Returns a reference to a node located left from this one
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316 * @return <code>Node</code> on the left from this one
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317 * @since 3.4
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318 */
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319 public Node getLeft() {
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320 return left;
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321 }
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322
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323 /**
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324 * Returns a reference to a node located right from this one
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325 * @return <code>Node</code> on the right from this one
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326 * @since 3.4
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327 */
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328 public Node getRight() {
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329 return right;
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330 }
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331
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332 }