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annotate dwtx/draw2d/graph/NodeCluster.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) 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.NodeCluster;
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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 dwtx.draw2d.graph.NodeList;
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18 import dwtx.draw2d.graph.CollapsedEdges;
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19
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20 /**
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21 * A group of nodes which are interlocked and cannot be separately placed.
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22 * @since 3.1
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23 */
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24 class NodeCluster : NodeList {
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25
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26 alias NodeList.adjustRank adjustRank;
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27
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28 int toHash_;
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29
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30 bool isSetMember;
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31 bool isDirty;
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32 bool leftDirty;
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33 bool rightDirty;
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34
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35 int leftFreedom;
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36 int rightFreedom;
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37 int leftNonzero;
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38 int rightNonzero;
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39 int leftCount = 0;
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40 int rightCount = 0;
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41
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42 CollapsedEdges[] leftLinks;
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43 CollapsedEdges[] rightLinks;
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44 NodeCluster[] leftNeighbors;
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45 NodeCluster[] rightNeighbors;
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46
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47 int effectivePull;
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48 int weightedTotal;
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49 int weightedDivisor;
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50 int unweightedTotal;
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51 int unweightedDivisor;
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52
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53 public this(){
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54 toHash_ = (new Object()).toHash();
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55 leftLinks = new CollapsedEdges[10];
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56 rightLinks = new CollapsedEdges[10];
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57 leftNeighbors = new NodeCluster[10];
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58 rightNeighbors = new NodeCluster[10];
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59 }
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60
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61 void addLeftNeighbor(NodeCluster neighbor, CollapsedEdges link) {
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62 //Need to grow array in the following case
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63 if (leftNeighbors.length is leftCount) {
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64 int newSize = leftNeighbors.length * 2;
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65
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66 NodeCluster newNeighbors[] = new NodeCluster[newSize];
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67 CollapsedEdges newLinks[] = new CollapsedEdges[newSize];
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68
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69 System.arraycopy(leftNeighbors, 0, newNeighbors, 0, leftNeighbors.length);
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70 System.arraycopy(leftLinks, 0, newLinks, 0, leftLinks.length);
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71
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72 leftNeighbors = newNeighbors;
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73 leftLinks = newLinks;
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74 }
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75 leftNeighbors[leftCount] = neighbor;
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76 leftLinks[leftCount++] = link;
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77 }
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78
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79 void addRightNeighbor(NodeCluster neighbor, CollapsedEdges link) {
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80 if (rightNeighbors.length is rightCount) {
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81 int newSize = rightNeighbors.length * 2;
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82
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83 NodeCluster newNeighbors[] = new NodeCluster[newSize];
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84 CollapsedEdges newLinks[] = new CollapsedEdges[newSize];
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85
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86 System.arraycopy(rightNeighbors, 0, newNeighbors, 0, rightNeighbors.length);
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87 System.arraycopy(rightLinks, 0, newLinks, 0, rightLinks.length);
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88
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89 rightNeighbors = newNeighbors;
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90 rightLinks = newLinks;
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91 }
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92 rightNeighbors[rightCount] = neighbor;
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93 rightLinks[rightCount++] = link;
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94 }
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95
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96 public void adjustRank(int delta, Collection affected) {
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97 adjustRank(delta);
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98 NodeCluster neighbor;
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99 CollapsedEdges edges;
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100 for (int i = 0; i < leftCount; i++) {
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101 neighbor = leftNeighbors[i];
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102 if (neighbor.isSetMember)
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103 continue;
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104 edges = leftLinks[i];
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105
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106 neighbor.weightedTotal += delta * edges.collapsedWeight;
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107 neighbor.unweightedTotal += delta * edges.collapsedCount;
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108
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109 weightedTotal -= delta * edges.collapsedWeight;
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110 unweightedTotal -= delta * edges.collapsedCount;
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111
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112 neighbor.rightDirty = leftDirty = true;
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113 if (!neighbor.isDirty) {
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114 neighbor.isDirty = true;
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115 affected.add(neighbor);
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116 }
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117 }
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118 for (int i = 0; i < rightCount; i++) {
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119 neighbor = rightNeighbors[i];
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120 if (neighbor.isSetMember)
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121 continue;
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122 edges = rightLinks[i];
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123
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124 neighbor.weightedTotal += delta * edges.collapsedWeight;
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125 neighbor.unweightedTotal += delta * edges.collapsedCount;
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126
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127 weightedTotal -= delta * edges.collapsedWeight;
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128 unweightedTotal -= delta * edges.collapsedCount;
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129
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130 neighbor.leftDirty = rightDirty = true;
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131 if (!neighbor.isDirty) {
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132 neighbor.isDirty = true;
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133 affected.add(neighbor);
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134 }
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135 }
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136 isDirty = true;
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137 affected.add(this);
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138 }
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139
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140 public override int opEquals(Object o) {
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141 return o is this;
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142 }
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143
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144 CollapsedEdges getLeftNeighbor(NodeCluster neighbor) {
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145 for (int i = 0; i < leftCount; i++) {
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146 if (leftNeighbors[i] is neighbor)
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147 return leftLinks[i];
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148 }
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149 return null;
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150 }
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151
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152 int getPull() {
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153 return effectivePull;
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154 }
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155
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156 CollapsedEdges getRightNeighbor(NodeCluster neighbor) {
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157 for (int i = 0; i < rightCount; i++) {
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158 if (rightNeighbors[i] is neighbor)
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159 return rightLinks[i];
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160 }
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161 return null;
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162 }
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163
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164 public override hash_t toHash() {
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165 return toHash_;
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166 }
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167
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168 /**
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169 * Initializes pull and freedom values.
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170 */
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171 void initValues() {
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172 weightedTotal = 0;
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173 weightedDivisor = 0;
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174 unweightedTotal = 0;
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175 int slack;
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176
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177 leftNonzero = rightNonzero = leftFreedom = rightFreedom = Integer.MAX_VALUE;
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178 for (int i = 0; i < leftCount; i++) {
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179 CollapsedEdges edges = leftLinks[i];
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180 weightedTotal -= edges.getWeightedPull();
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181 unweightedTotal -= edges.tightestEdge.getSlack();
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182 unweightedDivisor += edges.collapsedCount;
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183 weightedDivisor += edges.collapsedWeight;
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184 slack = edges.tightestEdge.getSlack();
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185 leftFreedom = Math.min(slack, leftFreedom);
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186 if (slack > 0)
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187 leftNonzero = Math.min(slack, leftNonzero);
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188 }
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189 for (int i = 0; i < rightCount; i++) {
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190 CollapsedEdges edges = rightLinks[i];
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191 weightedTotal += edges.getWeightedPull();
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192 unweightedDivisor += edges.collapsedCount;
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193 unweightedTotal += edges.tightestEdge.getSlack();
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194 weightedDivisor += edges.collapsedWeight;
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195 slack = edges.tightestEdge.getSlack();
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196 rightFreedom = Math.min(slack, rightFreedom);
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197 if (slack > 0)
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198 rightNonzero = Math.min(slack, rightNonzero);
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199 }
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200 updateEffectivePull();
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201 }
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202
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203 /**
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204 * Refreshes the left and right freedom.
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205 */
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206 void refreshValues() {
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207 int slack;
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208 isDirty = false;
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209 if (leftDirty) {
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210 leftDirty = false;
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211 leftNonzero = leftFreedom = Integer.MAX_VALUE;
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212 for (int i = 0; i < leftCount; i++) {
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213 CollapsedEdges edges = leftLinks[i];
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214 slack = edges.tightestEdge.getSlack();
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215 leftFreedom = Math.min(slack, leftFreedom);
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216 if (slack > 0)
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217 leftNonzero = Math.min(slack, leftNonzero);
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218 }
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219 }
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220 if (rightDirty) {
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221 rightDirty = false;
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222 rightNonzero = rightFreedom = Integer.MAX_VALUE;
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223 for (int i = 0; i < rightCount; i++) {
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224 CollapsedEdges edges = rightLinks[i];
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225 slack = edges.tightestEdge.getSlack();
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226 rightFreedom = Math.min(slack, rightFreedom);
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227 if (slack > 0)
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228 rightNonzero = Math.min(slack, rightNonzero);
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229 }
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230 }
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231 updateEffectivePull();
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232 }
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233
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234 private void updateEffectivePull() {
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235 if (weightedDivisor !is 0)
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236 effectivePull = weightedTotal / weightedDivisor;
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237 else if (unweightedDivisor !is 0)
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238 effectivePull = unweightedTotal / unweightedDivisor;
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239 else
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240 effectivePull = 0;
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241 }
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242
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243 }