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source: branches/OaaS/HeuristicLab.Problems.VehicleRouting/3.3/Encodings/Zhu/Crossovers/ZhuHeuristicCrossover1.cs @ 15762

Last change on this file since 15762 was 7259, checked in by swagner, 13 years ago

Updated year of copyrights to 2012 (#1716)

File size: 3.5 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2012 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 HeuristicLab.Common;
23using HeuristicLab.Core;
24using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
25
26namespace HeuristicLab.Problems.VehicleRouting.Encodings.Zhu {
27  [Item("ZhuHeuristicCrossover1", "The Zhu Heuristic Crossover (Version 1). It is implemented as described in Zhu, K.Q. (2000). A New Genetic Algorithm For VRPTW. Proceedings of the International Conference on Artificial Intelligence.")]
28  [StorableClass]
29  public sealed class ZhuHeuristicCrossover1 : ZhuCrossover {
30    [StorableConstructor]
31    private ZhuHeuristicCrossover1(bool deserializing) : base(deserializing) { }
32    private ZhuHeuristicCrossover1(ZhuHeuristicCrossover1 original, Cloner cloner)
33      : base(original, cloner) {
34    }
35    public override IDeepCloneable Clone(Cloner cloner) {
36      return new ZhuHeuristicCrossover1(this, cloner);
37    }
38    public ZhuHeuristicCrossover1()
39      : base() {
40    }
41
42    private void Swap(ZhuEncoding individual, int city1, int city2) {
43      int index1 = individual.IndexOf(city1);
44      int index2 = individual.IndexOf(city2);
45
46      int temp = individual[index1];
47      individual[index1] = individual[index2];
48      individual[index2] = temp;
49    }
50
51    protected override ZhuEncoding Crossover(IRandom random, ZhuEncoding parent1, ZhuEncoding parent2) {
52      parent1 = parent1.Clone() as ZhuEncoding;
53      parent2 = parent2.Clone() as ZhuEncoding;
54
55      ZhuEncoding child = parent2.Clone() as ZhuEncoding;
56
57      int breakPoint = random.Next(child.Length);
58      int i = breakPoint;
59      int predecessor = breakPoint - 1;
60      if (predecessor < 0)
61        predecessor = predecessor + child.Length;
62
63      while (i != predecessor) {
64        if (i == breakPoint) {
65          child[i] = parent1[i];
66          Swap(parent2, parent2[i], parent1[i]);
67        }
68
69        if (VRPUtilities.GetDistance(
70          child[i] + 1, parent1[(i + 1) % child.Length] + 1,
71          CoordinatesParameter.ActualValue, DistanceMatrixParameter,
72          UseDistanceMatrixParameter.ActualValue)
73          <
74          VRPUtilities.GetDistance(
75          child[i] + 1, parent2[(i + 1) % child.Length] + 1,
76          CoordinatesParameter.ActualValue, DistanceMatrixParameter,
77          UseDistanceMatrixParameter.ActualValue)) {
78          child[(i + 1) % child.Length] = parent1[(i + 1) % child.Length];
79          Swap(parent2, parent2[(i + 1) % child.Length], parent1[(i + 1) % child.Length]);
80        } else {
81          child[(i + 1) % child.Length] = parent2[(i + 1) % child.Length];
82          Swap(parent1, parent1[(i + 1) % child.Length], parent2[(i + 1) % child.Length]);
83        }
84
85        i = (i + 1) % child.Length;
86      }
87
88      return child;
89    }
90  }
91}
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