1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2019 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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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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22 | using System;
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23 | using System.Collections.Generic;
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24 | using HeuristicLab.Common;
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25 | using HeuristicLab.Core;
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26 | using HeuristicLab.Data;
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27 | using HeuristicLab.Optimization;
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28 | using HeuristicLab.Parameters;
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29 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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30 | using HeuristicLab.Problems.VehicleRouting.Interfaces;
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31 | using HeuristicLab.Problems.VehicleRouting.ProblemInstances;
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32 | using HeuristicLab.Problems.VehicleRouting.Variants;
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33 |
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34 | namespace HeuristicLab.Problems.VehicleRouting.Encodings.Potvin {
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35 | [Item("IterativeInsertionCreator", "Creates a randomly initialized VRP solution.")]
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36 | [StorableClass]
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37 | public sealed class IterativeInsertionCreator : PotvinCreator, IStochasticOperator {
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38 | #region IStochasticOperator Members
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39 | public ILookupParameter<IRandom> RandomParameter {
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40 | get { return (LookupParameter<IRandom>)Parameters["Random"]; }
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41 | }
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42 | #endregion
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43 |
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44 | public IValueParameter<BoolValue> AdhereTimeWindowsParameter {
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45 | get { return (IValueParameter<BoolValue>)Parameters["AdhereTimeWindows"]; }
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46 | }
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47 |
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48 | [StorableConstructor]
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49 | private IterativeInsertionCreator(bool deserializing) : base(deserializing) { }
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50 |
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51 | public IterativeInsertionCreator()
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52 | : base() {
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53 | Parameters.Add(new LookupParameter<IRandom>("Random", "The pseudo random number generator."));
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54 | Parameters.Add(new ValueParameter<BoolValue>("AdhereTimeWindows", "Specifies if the time windows should be considered during construction.", new BoolValue(true)));
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55 | }
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56 |
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57 | public override IDeepCloneable Clone(Cloner cloner) {
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58 | return new IterativeInsertionCreator(this, cloner);
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59 | }
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60 |
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61 | private IterativeInsertionCreator(IterativeInsertionCreator original, Cloner cloner)
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62 | : base(original, cloner) {
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63 | }
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64 |
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65 | private static double CalculateAngleToDepot(IVRPProblemInstance instance, int city) {
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66 | double dx = instance.GetCoordinates(0)[0];
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67 | double dy = instance.GetCoordinates(0)[1];
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68 |
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69 | double cx = instance.GetCoordinates(city)[0];
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70 | double cy = instance.GetCoordinates(city)[1];
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71 |
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72 | double alpha = Math.Atan((cx - dx) / (dy - cy)) * (180.0 / Math.PI);
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73 | if (cx > dx && cy > dy)
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74 | alpha = (90.0 + alpha) + 90.0;
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75 | else if (cx < dx && cy > dy)
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76 | alpha = alpha + 180.0;
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77 | else if (cx < dx && cy < dy)
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78 | alpha = (90.0 + alpha) + 270.0;
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79 |
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80 | return alpha;
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81 | }
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82 |
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83 | public static PotvinEncoding CreateSolution(IVRPProblemInstance instance, IRandom random, bool adhereTimeWindows) {
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84 | PotvinEncoding result = new PotvinEncoding(instance);
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85 |
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86 | IPickupAndDeliveryProblemInstance pdp = instance as IPickupAndDeliveryProblemInstance;
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87 |
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88 | List<int> customers = new List<int>();
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89 | for (int i = 1; i <= instance.Cities.Value; i++)
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90 | if (pdp == null || pdp.GetDemand(i) >= 0)
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91 | customers.Add(i);
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92 |
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93 | customers.Sort((city1, city2) => {
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94 | double angle1 = CalculateAngleToDepot(instance, city1);
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95 | double angle2 = CalculateAngleToDepot(instance, city2);
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96 |
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97 | return angle1.CompareTo(angle2);
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98 | });
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99 |
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100 | Tour currentTour = new Tour();
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101 | result.Tours.Add(currentTour);
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102 |
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103 | int j = random.Next(customers.Count);
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104 | for (int i = 0; i < customers.Count; i++) {
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105 | int index = (i + j) % customers.Count;
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106 |
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107 | int stopIdx = 0;
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108 | if (currentTour.Stops.Count > 0)
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109 | stopIdx = result.FindBestInsertionPlace(currentTour, customers[index]);
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110 | currentTour.Stops.Insert(stopIdx, customers[index]);
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111 |
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112 | if (pdp != null) {
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113 | stopIdx = result.FindBestInsertionPlace(currentTour, pdp.GetPickupDeliveryLocation(customers[index]));
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114 | currentTour.Stops.Insert(stopIdx, pdp.GetPickupDeliveryLocation(customers[index]));
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115 | }
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116 |
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117 | CVRPEvaluation evaluation = instance.EvaluateTour(currentTour, result) as CVRPEvaluation;
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118 | if (result.Tours.Count < instance.Vehicles.Value &&
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119 | ((adhereTimeWindows && !instance.Feasible(evaluation)) || ((!adhereTimeWindows) && evaluation.Overload > double.Epsilon))) {
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120 | currentTour.Stops.Remove(customers[index]);
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121 | if (pdp != null)
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122 | currentTour.Stops.Remove(pdp.GetPickupDeliveryLocation(customers[index]));
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123 |
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124 | if (currentTour.Stops.Count == 0)
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125 | result.Tours.Remove(currentTour);
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126 | currentTour = new Tour();
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127 | result.Tours.Add(currentTour);
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128 |
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129 | currentTour.Stops.Add(customers[index]);
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130 | if (pdp != null) {
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131 | currentTour.Stops.Add(pdp.GetPickupDeliveryLocation(customers[index]));
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132 | }
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133 | }
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134 | }
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135 |
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136 | if (currentTour.Stops.Count == 0)
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137 | result.Tours.Remove(currentTour);
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138 |
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139 | return result;
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140 | }
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141 |
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142 | public override IOperation InstrumentedApply() {
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143 | VRPToursParameter.ActualValue = CreateSolution(ProblemInstance, RandomParameter.ActualValue, AdhereTimeWindowsParameter.Value.Value);
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144 |
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145 | return base.InstrumentedApply();
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146 | }
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147 | }
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148 | }
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