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annotate dwtx/draw2d/graph/CompoundPopulateRanks.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, 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.CompoundPopulateRanks;
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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.PopulateRanks;
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18 import dwtx.draw2d.graph.DirectedGraph;
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19 import dwtx.draw2d.graph.Subgraph;
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20 import dwtx.draw2d.graph.CompoundDirectedGraph;
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21 import dwtx.draw2d.graph.Edge;
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22 import dwtx.draw2d.graph.NodeList;
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23 import dwtx.draw2d.graph.Node;
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24
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25 /**
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26 * Places nodes into ranks for a compound directed graph. If a subgraph spans a rank
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27 * without any nodes which belong to that rank, a bridge node is inserted to prevent nodes
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28 * from violating the subgraph boundary.
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29 * @author Randy Hudson
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30 * @since 2.1.2
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31 */
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32 class CompoundPopulateRanks : PopulateRanks {
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33
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34 public void visit(DirectedGraph g) {
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35 CompoundDirectedGraph graph = cast(CompoundDirectedGraph)g;
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36
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37 /**
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38 * Remove long containment edges at this point so they don't affect MinCross.
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39 */
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40 Iterator containment = graph.containment.iterator();
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41 while (containment.hasNext()) {
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42 Edge e = cast(Edge)containment.next();
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43 if (e.getSlack() > 0) {
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44 graph.removeEdge(e);
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45 containment.remove();
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46 }
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47 }
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48
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49 super.visit(g);
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50 NodeList subgraphs = graph.subgraphs;
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51 for (int i = 0; i < subgraphs.size(); i++) {
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52 Subgraph subgraph = cast(Subgraph)subgraphs.get(i);
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53 bridgeSubgraph(subgraph, graph);
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54 }
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55 }
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56
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57 /**
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58 * @param subgraph
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59 */
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60 private void bridgeSubgraph(Subgraph subgraph, CompoundDirectedGraph g) {
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61 int offset = subgraph.head.rank;
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62 bool occupied[] = new bool[subgraph.tail.rank - subgraph.head.rank + 1];
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63 Node bridge[] = new Node[occupied.length];
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64
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65 for (int i = 0; i < subgraph.members.size(); i++) {
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66 Node n = cast(Node)subgraph.members.get(i);
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67 if (auto s = cast(Subgraph)n ) {
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68 for (int r = s.head.rank; r <= s.tail.rank; r++)
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69 occupied[r - offset] = true;
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70 } else
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71 occupied[n.rank - offset] = true;
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72 }
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73
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74 for (int i = 0; i < bridge.length; i++) {
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75 if (!occupied[i]) {
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76 Node br = bridge[i] = new Node(stringcast("bridge"), subgraph); //$NON-NLS-1$
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77 br.rank = i + offset;
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78 br.height = br.width = 0;
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79 br.nestingIndex = subgraph.nestingIndex;
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80 g.ranks.getRank(br.rank).add(br);
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81 g.nodes.add(br);
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82 }
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83 }
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84 }
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85
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86 }