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annotate dwtx/draw2d/graph/TightSpanningTreeSolver.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) 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.TightSpanningTreeSolver;
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14
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15 import dwt.dwthelper.utils;
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16 import dwtx.draw2d.graph.SpanningTreeVisitor;
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17 import dwtx.draw2d.graph.DirectedGraph;
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18 import dwtx.draw2d.graph.Edge;
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19 import dwtx.draw2d.graph.EdgeList;
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20 import dwtx.draw2d.graph.Node;
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21 import dwtx.draw2d.graph.NodeList;
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22
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23 /**
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24 * Finds a tight spanning tree from the graphs edges which induce a valid rank assignment.
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25 * This process requires that the nodes be initially given a feasible ranking.
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26 * @author Randy Hudson
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27 * @since 2.1.2
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28 */
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29 class TightSpanningTreeSolver : SpanningTreeVisitor {
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30
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31 protected DirectedGraph graph;
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32 protected CandidateList candidates;
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33
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34 static final class CandidateList {
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35 private Edge[] edges;
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36 private int size_;
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37
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38 public this(){
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39 edges = new Edge[10];
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40 }
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41 public void add(Edge edge) {
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42 if (size_ is edges.length - 1) {
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43 Edge newEdges[] = new Edge[edges.length * 2];
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44 System.arraycopy(edges, 0, newEdges, 0, edges.length);
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45 edges = newEdges;
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46 }
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47 edges[size_++] = edge;
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48 }
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49
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50 public Edge getEdge(int index) {
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51 return edges[index];
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52 }
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53
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54 public void remove(Edge edge) {
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55 for (int i = 0; i < size_; i++) {
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56 if (edges[i] is edge) {
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57 edges[i] = edges[size_ - 1];
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58 size_--;
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59 return;
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60 }
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61 }
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62 throw new RuntimeException("Remove called on invalid Edge"); //$NON-NLS-1$
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63 }
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64
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65 public int size() {
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66 return size_;
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67 }
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68 }
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69
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70 protected NodeList members;
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71
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72 public this(){
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73 candidates = new CandidateList();
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74 members = new NodeList();
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75 }
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76
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77 public void visit(DirectedGraph graph) {
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78 this.graph = graph;
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79 init();
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80 solve();
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81 }
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82
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83 Node addEdge(Edge edge) {
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84 int delta = edge.getSlack();
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85 edge.tree = true;
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86 Node node;
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87 if (edge.target.flag) {
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88 delta = -delta;
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89 node = edge.source;
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90 setParentEdge(node, edge);
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91 getSpanningTreeChildren(edge.target).add(edge);
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92 } else {
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93 node = edge.target;
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94 setParentEdge(node, edge);
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95 getSpanningTreeChildren(edge.source).add(edge);
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96 }
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97 members.adjustRank(delta);
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98 addNode(node);
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99 return node;
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100 }
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101
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102 private bool isNodeReachable(Node node) {
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103 return node.flag;
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104 }
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105
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106 private void setNodeReachable(Node node) {
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107 node.flag = true;
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108 }
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109
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110 private bool isCandidate(Edge e) {
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111 return e.flag;
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112 }
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113
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114 private void setCandidate(Edge e) {
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115 e.flag = true;
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116 }
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117
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118 void addNode(Node node) {
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119 setNodeReachable(node);
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120 EdgeList list = node.incoming;
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121 Edge e;
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122 for (int i = 0; i < list.size(); i++) {
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123 e = list.getEdge(i);
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124 if (!isNodeReachable(e.source)) {
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125 if (!isCandidate(e)) {
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126 setCandidate(e);
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127 candidates.add(e);
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128 }
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129 } else
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130 candidates.remove(e);
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131 }
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132
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133 list = node.outgoing;
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134 for (int i = 0; i < list.size(); i++) {
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135 e = list.getEdge(i);
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136 if (!isNodeReachable(e.target)) {
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137 if (!isCandidate(e)) {
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138 setCandidate(e);
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139 candidates.add(e);
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140 }
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141 } else
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142 candidates.remove(e);
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143 }
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144 members.add(node);
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145 }
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146
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147 void init() {
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148 graph.edges.resetFlags(true);
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149 graph.nodes.resetFlags();
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150 for (int i = 0; i < graph.nodes.size(); i++) {
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151 Node node = cast(Node)graph.nodes.get(i);
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152 node.workingData[0] = new EdgeList();
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153 }
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154 }
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155
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156 protected void solve() {
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157 Node root = graph.nodes.getNode(0);
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158 setParentEdge(root, null);
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159 addNode(root);
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160 while (members.size() < graph.nodes.size()) {
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161 if (candidates.size() is 0)
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162 throw new RuntimeException("graph is not fully connected");//$NON-NLS-1$
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163 int minSlack = Integer.MAX_VALUE, slack;
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164 Edge minEdge = null, edge;
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165 for (int i = 0; i < candidates.size() && minSlack > 0; i++) {
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166 edge = candidates.getEdge(i);
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167 slack = edge.getSlack();
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168 if (slack < minSlack) {
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169 minSlack = slack;
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170 minEdge = edge;
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171 }
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172 }
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173 addEdge(minEdge);
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174 }
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175 graph.nodes.normalizeRanks();
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176 }
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177
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178 }