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annotate dwtx/draw2d/graph/SpanningTreeVisitor.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.SpanningTreeVisitor;
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14
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15 import dwt.dwthelper.utils;
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16 import dwtx.draw2d.graph.GraphVisitor;
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17 import dwtx.draw2d.graph.Edge;
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18 import dwtx.draw2d.graph.Node;
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19 import dwtx.draw2d.graph.EdgeList;
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20
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21 /**
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22 * A base class for visitors which operate on the graphs spanning tree used to induce rank
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23 * assignments.
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24 * @author Randy Hudson
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25 * @since 2.1.2
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26 */
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27 abstract class SpanningTreeVisitor : GraphVisitor {
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28
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29 Edge getParentEdge(Node node) {
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30 return cast(Edge)node.workingData[1];
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31 }
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32
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33 EdgeList getSpanningTreeChildren(Node node) {
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34 return cast(EdgeList)node.workingData[0];
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35 }
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36
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37 protected Node getTreeHead(Edge edge) {
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38 if (getParentEdge(edge.source) is edge)
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39 return edge.target;
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40 return edge.source;
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41 }
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42
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43 Node getTreeParent(Node node) {
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44 Edge e = getParentEdge(node);
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45 if (e is null)
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46 return null;
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47 return e.opposite(node);
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48 }
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49
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50 protected Node getTreeTail(Edge edge) {
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51 if (getParentEdge(edge.source) is edge)
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52 return edge.source;
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53 return edge.target;
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54 }
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55
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56 void setParentEdge(Node node, Edge edge) {
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57 node.workingData[1] = edge;
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58 }
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59
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60 }