source: branches/HeuristicLab.ReingoldTilfordTreeLayout/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.4/LayoutEngines/SymbolicExpressionTreeLayoutAdapter.cs @ 9970

Last change on this file since 9970 was 9970, checked in by bburlacu, 6 years ago

#2076: Refactored layout engine to be more generic. Svn-copied folders from trunk and readded layout files.

File size: 3.8 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2013 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using System.Collections.Generic;
24using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding.LayoutEngines;
25
26namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
27  // adapter class that provides some conversion methods from symbolic expression trees to layout nodes (preserving the tree structure)
28  public class SymbolicExpressionTreeLayoutAdapter : ILayoutAdapter<ISymbolicExpressionTreeNode> {
29    // default conversion function between ISymbolicExpressionTreeNode and ILayoutNode<ISymbolicExpressionTree>
30    ILayoutNode<ISymbolicExpressionTreeNode> defaultConvert(ISymbolicExpressionTreeNode node) {
31      var layoutNode = new LayoutNode<ISymbolicExpressionTreeNode> { Content = node };
32      layoutNode.Ancestor = layoutNode;
33      return layoutNode;
34    }
35
36    public IEnumerable<ILayoutNode<ISymbolicExpressionTreeNode>> Convert(ISymbolicExpressionTree tree, Func<ISymbolicExpressionTreeNode, ILayoutNode<ISymbolicExpressionTreeNode>> convertFunc = null) {
37      return Convert(tree.Root, convertFunc);
38    }
39    // translate the symbolic expression tree structure to a layout node tree structure
40    // return an enumerable containing all the layout nodes
41    public IEnumerable<ILayoutNode<ISymbolicExpressionTreeNode>> Convert(ISymbolicExpressionTreeNode root, Func<ISymbolicExpressionTreeNode, ILayoutNode<ISymbolicExpressionTreeNode>> convertFunc = null) {
42      var rootLayoutNode = convertFunc == null ? defaultConvert(root) : convertFunc(root);
43      rootLayoutNode.Ancestor = rootLayoutNode;
44
45      if (root.SubtreeCount > 0) {
46        rootLayoutNode.Children = new List<ILayoutNode<ISymbolicExpressionTreeNode>>(root.SubtreeCount);
47        Expand(rootLayoutNode, convertFunc);
48      }
49
50      var list = new List<ILayoutNode<ISymbolicExpressionTreeNode>> { rootLayoutNode };
51      int i = 0;
52      while (i < list.Count) {
53        if (list[i].Children != null)
54          foreach (ILayoutNode<ISymbolicExpressionTreeNode> child in list[i].Children)
55            list.Add(child);
56        ++i;
57      }
58      return list;
59    }
60
61    private void Expand(ILayoutNode<ISymbolicExpressionTreeNode> layoutNode, Func<ISymbolicExpressionTreeNode, ILayoutNode<ISymbolicExpressionTreeNode>> convertFunc = null) {
62      if (layoutNode.Children == null) return;
63      for (int i = 0; i < layoutNode.Content.SubtreeCount; ++i) {
64        var subtree = layoutNode.Content.GetSubtree(i);
65        var childLayoutNode = convertFunc == null ? defaultConvert(subtree) : convertFunc(subtree);
66        childLayoutNode.Parent = layoutNode;
67        childLayoutNode.Number = i;
68        childLayoutNode.Level = layoutNode.Level + 1;
69        childLayoutNode.Ancestor = childLayoutNode;
70        childLayoutNode.Children = subtree.SubtreeCount > 0 ? new List<ILayoutNode<ISymbolicExpressionTreeNode>>(subtree.SubtreeCount) : null;
71        layoutNode.Children.Add(childLayoutNode);
72        Expand(childLayoutNode, convertFunc);
73      }
74    }
75  }
76}
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