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annotate dwtx/draw2d/graph/PopulateRanks.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.PopulateRanks;
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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.RevertableChange;
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18 import dwtx.draw2d.graph.GraphVisitor;
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19 import dwtx.draw2d.graph.DirectedGraph;
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20 import dwtx.draw2d.graph.RankList;
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21 import dwtx.draw2d.graph.Rank;
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22 import dwtx.draw2d.graph.Node;
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23 import dwtx.draw2d.graph.Edge;
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24 import dwtx.draw2d.graph.VirtualNodeCreation;
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25
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26 /**
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27 * This class takes a DirectedGraph with an optimal rank assignment and a spanning tree,
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28 * and populates the ranks of the DirectedGraph. Virtual nodes are inserted for edges that
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29 * span 1 or more ranks.
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30 * <P>
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31 * Ranks are populated using a pre-order depth-first traversal of the spanning tree. For
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32 * each node, all edges requiring virtual nodes are added to the ranks.
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33 * @author Randy Hudson
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34 * @since 2.1.2
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35 */
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36 class PopulateRanks : GraphVisitor {
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37
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38 private Stack changes;
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39
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40 public this(){
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41 changes = new Stack();
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42 }
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43 /**
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44 * @see GraphVisitor#visit(DirectedGraph)
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45 */
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46 public void visit(DirectedGraph g) {
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47 if (g.forestRoot !is null) {
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48 for (int i = g.forestRoot.outgoing.size() - 1; i >= 0; i--)
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49 g.removeEdge(g.forestRoot.outgoing.getEdge(i));
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50 g.removeNode(g.forestRoot);
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51 }
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52 g.ranks = new RankList();
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53 for (int i = 0; i < g.nodes.size(); i++) {
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54 Node node = g.nodes.getNode(i);
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55 g.ranks.getRank(node.rank).add(node);
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56 }
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57 for (int i = 0; i < g.nodes.size(); i++) {
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58 Node node = g.nodes.getNode(i);
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59 for (int j = 0; j < node.outgoing.size();) {
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60 Edge e = node.outgoing.getEdge(j);
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61 if (e.getLength() > 1)
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62 changes.push(new VirtualNodeCreation(e, g));
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63 else
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64 j++;
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65 }
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66 }
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67 }
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68
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69 /**
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70 * @see GraphVisitor#revisit(DirectedGraph)
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71 */
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72 public void revisit(DirectedGraph g) {
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73 for (int r = 0; r < g.ranks.size(); r++) {
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74 Rank rank = g.ranks.getRank(r);
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75 Node prev = null, cur;
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76 for (int n = 0; n < rank.size(); n++) {
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77 cur = rank.getNode(n);
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78 cur.left = prev;
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79 if (prev !is null) {
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80 prev.right = cur;
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81 }
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82 prev = cur;
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83 }
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84 }
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85 for (int i = 0; i < changes.size(); i++) {
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86 RevertableChange change = cast(RevertableChange)changes.get(i);
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87 change.revert();
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88 }
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89 }
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90
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91 }