[2] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[14185] | 3 | * Copyright (C) 2002-2016 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[2] | 4 | *
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| 5 | * This file is part of HeuristicLab.
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| 6 | *
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| 7 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation, either version 3 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * HeuristicLab is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 | #endregion
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| 21 |
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[4722] | 22 | using HeuristicLab.Common;
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[2] | 23 | using HeuristicLab.Core;
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[2854] | 24 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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[2] | 25 |
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[3053] | 26 | namespace HeuristicLab.Encodings.PermutationEncoding {
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[850] | 27 | /// <summary>
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| 28 | /// Manipulates a permutation array by moving and reversing a randomly chosen interval of elements to another
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| 29 | /// (randomly chosen) position in the array.
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| 30 | /// </summary>
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[2854] | 31 | /// <remarks>
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[2871] | 32 | /// It is implemented as described in Fogel, D.B. 1993. Applying Evolutionary Programming to Selected TSP Problems, Cybernetics and Systems, 22, pp 27-36.
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[2854] | 33 | /// </remarks>
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[2871] | 34 | [Item("TranslocationInversionManipulator", "An operator which inverts a randomly chosen part of a permutation and inserts it at a random position. It is implemented as described in Fogel, D.B. 1993. Applying Evolutionary Programming to Selected TSP Problems, Cybernetics and Systems, 22, pp. 27-36.")]
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[3017] | 35 | [StorableClass]
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[2854] | 36 | public class TranslocationInversionManipulator : PermutationManipulator {
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[4722] | 37 | [StorableConstructor]
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| 38 | protected TranslocationInversionManipulator(bool deserializing) : base(deserializing) { }
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| 39 | protected TranslocationInversionManipulator(TranslocationInversionManipulator original, Cloner cloner) : base(original, cloner) { }
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| 40 | public TranslocationInversionManipulator() : base() { }
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| 41 |
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| 42 | public override IDeepCloneable Clone(Cloner cloner) {
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| 43 | return new TranslocationInversionManipulator(this, cloner);
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| 44 | }
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| 45 |
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[850] | 46 | /// <summary>
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| 47 | /// Moves a randomly chosen interval of elements to another (randomly chosen) position in the given
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| 48 | /// <paramref name="permutation"/> array and reverses it.
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| 49 | /// </summary>
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| 50 | /// <param name="random">The random number generator.</param>
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| 51 | /// <param name="permutation">The permutation array to manipulate.</param>
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[2854] | 52 | public static void Apply(IRandom random, Permutation permutation) {
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| 53 | Permutation original = (Permutation)permutation.Clone();
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[2] | 54 | int breakPoint1, breakPoint2, insertPoint, insertPointLimit;
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| 55 |
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[2854] | 56 | breakPoint1 = random.Next(original.Length - 1);
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| 57 | breakPoint2 = random.Next(breakPoint1 + 1, original.Length);
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| 58 | insertPointLimit = original.Length - breakPoint2 + breakPoint1 - 1; // get insertion point in remaining part
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[2] | 59 | if (insertPointLimit > 0)
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| 60 | insertPoint = random.Next(insertPointLimit);
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| 61 | else
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| 62 | insertPoint = 0;
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| 63 |
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| 64 | int i = 0; // index in new permutation
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| 65 | int j = 0; // index in old permutation
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[2854] | 66 | while (i < original.Length) {
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[2] | 67 | if (i == insertPoint) { // copy translocated area
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| 68 | for (int k = breakPoint2; k >= breakPoint1; k--) {
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[2854] | 69 | permutation[i] = original[k];
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[2] | 70 | i++;
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| 71 | }
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| 72 | }
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| 73 | if (j == breakPoint1) { // skip area between breakpoints
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| 74 | j = breakPoint2 + 1;
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| 75 | }
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[2854] | 76 | if ((i < original.Length) && (j < original.Length)) {
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| 77 | permutation[i] = original[j];
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[2] | 78 | i++;
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| 79 | j++;
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| 80 | }
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| 81 | }
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| 82 | }
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| 83 |
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[850] | 84 | /// <summary>
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| 85 | /// Moves a randomly chosen interval of elements to another (randomly chosen) position in the given
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| 86 | /// <paramref name="permutation"/> array and reverses it.
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| 87 | /// </summary>
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| 88 | /// <remarks>Calls <see cref="Apply"/>.</remarks>
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[2854] | 89 | /// <param name="random">A random number generator.</param>
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| 90 | /// <param name="permutation">The permutation to manipulate.</param>
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| 91 | protected override void Manipulate(IRandom random, Permutation permutation) {
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| 92 | Apply(random, permutation);
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[2] | 93 | }
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| 94 | }
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| 95 | }
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