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annotate dwtx/draw2d/graph/CollapsedEdges.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) 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.CollapsedEdges;
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14
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15 import dwt.dwthelper.utils;
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16 import dwtx.draw2d.graph.Edge;
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17
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18 /**
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19 * Contains the information from all edges going from a given cluster to some other
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20 * cluster. An edge with minimal slack as chosen to maintain the link between clusters.
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21 * The weight and any slack more than the minimal edge's slack is tracked for all other
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22 * edges.
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23 * @since 3.1
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24 */
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25 class CollapsedEdges {
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26
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27 /**
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28 * The total weight of the collapsed edges.
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29 */
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30 int collapsedWeight;
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31 int collapsedCount;
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32
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33 /**
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34 * The total amount of weighted difference in the collapsed edges slack and the
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35 * tightest edge's slack.
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36 */
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37 int overage;
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38 int unOverage;
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39 Edge tightestEdge;
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40
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41 this(Edge edge) {
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42 tightestEdge = edge;
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43 collapsedWeight = edge.weight;
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44 collapsedCount++;
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45 }
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46
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47 public int getWeightedPull() {
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48 return tightestEdge.getSlack() * collapsedWeight + overage;
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49 }
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50
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51 public bool isTight() {
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52 return tightestEdge.getSlack() is 0;
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53 }
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54
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55 /**
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56 * Compares the given edge to the current tightest edge. If the given edge is tighter
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57 * than the current, the current tightest is returned. Otherwise, the edge itself is
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58 * returned. The returned edge would be the one to remove from the graph.
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59 * @param candidate another edge
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60 * @return the edge which is not the tightest edge
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61 * @since 3.1
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62 */
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63 Edge processEdge(Edge candidate) {
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64 collapsedCount++;
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65 if (candidate.getSlack() < tightestEdge.getSlack()) {
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66 overage += collapsedWeight * (tightestEdge.getSlack() - candidate.getSlack());
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67 Edge temp = tightestEdge;
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68 tightestEdge = candidate;
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69 collapsedWeight += candidate.weight;
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70 return temp;
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71 } else {
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72 int over = candidate.getSlack() - tightestEdge.getSlack();
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73 unOverage += over;
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74 overage += candidate.weight * over;
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75 collapsedWeight += candidate.weight;
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76 return candidate;
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77 }
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78 }
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79 }