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source: trunk/sources/HeuristicLab.GP.StructureIdentification/3.3/Symbols/ConstantFunctionTree.cs @ 2668

Last change on this file since 2668 was 2235, checked in by gkronber, 15 years ago

Fixed #323 (The default representation of FunctionTreeView should show coefficients and time-offsets of variables and values of constants).

File size: 3.2 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2008 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.Collections.Generic;
23using HeuristicLab.Core;
24using HeuristicLab.Data;
25using HeuristicLab.GP.Interfaces;
26using System.Xml;
27
28namespace HeuristicLab.GP.StructureIdentification {
29  public class ConstantFunctionTree : TerminalTreeNode {
30    public double Value { get; set; }
31
32    public ConstantFunctionTree(Constant constant)
33      : base(constant) {
34    }
35
36    protected ConstantFunctionTree(ConstantFunctionTree original)
37      : base(original) {
38      Value = original.Value;
39    }
40
41    public override bool HasLocalParameters {
42      get {
43        return true;
44      }
45    }
46
47    public override IOperation CreateShakingOperation(IScope scope) {
48      Scope myVariableScope = new Scope();
49      scope.AddSubScope(myVariableScope);
50      myVariableScope.AddVariable(CreateValueVariable());
51      return new AtomicOperation(Function.Manipulator, myVariableScope);
52    }
53
54    public override IOperation CreateInitOperation(IScope scope) {
55      Scope myVariableScope = new Scope();
56      scope.AddSubScope(myVariableScope);
57      myVariableScope.AddVariable(CreateValueVariable());
58      return new AtomicOperation(Function.Initializer, myVariableScope);
59    }
60
61    public override string ToString() {
62      return SymbolicExpressionExporter.GetName(this);
63    }
64
65    #region serialization
66    public override object Clone() {
67      return new ConstantFunctionTree(this);
68    }
69
70    public override XmlNode GetXmlNode(string name, XmlDocument document, IDictionary<System.Guid, IStorable> persistedObjects) {
71      XmlNode node = document.CreateElement(name);
72      XmlAttribute valueAttr = document.CreateAttribute("Value");
73      valueAttr.Value = XmlConvert.ToString(Value);
74      node.Attributes.Append(valueAttr);
75      return node;
76    }
77
78    public override void Populate(XmlNode node, IDictionary<System.Guid, IStorable> restoredObjects) {
79      base.Populate(node, restoredObjects);
80      Value = XmlConvert.ToDouble(node.Attributes["Value"].Value);
81    }
82    #endregion
83
84    private IVariable CreateValueVariable() {
85      DoubleData data = new DoubleData(Value);
86      data.Changed += (sender, args) => Value = data.Data;
87      var variable = new HeuristicLab.Core.Variable(Constant.VALUE, data);
88      variable.ValueChanged += (sender, args) => Value = ((DoubleData)variable.Value).Data;
89      return variable;
90    }
91  }
92}
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