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source: trunk/sources/HeuristicLab.Problems.VehicleRouting/3.3/VehicleRoutingProblem.cs @ 4179

Last change on this file since 4179 was 4179, checked in by svonolfe, 13 years ago

Refactored VRP based on the code review (#1039)

File size: 21.9 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2010 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 System.Drawing;
25using System.Linq;
26using HeuristicLab.Common;
27using HeuristicLab.Core;
28using HeuristicLab.Data;
29using HeuristicLab.Encodings.PermutationEncoding;
30using HeuristicLab.Optimization;
31using HeuristicLab.Parameters;
32using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
33using HeuristicLab.PluginInfrastructure;
34using HeuristicLab.Problems.VehicleRouting.Encodings.Alba;
35using HeuristicLab.Problems.VehicleRouting.Encodings.General;
36
37namespace HeuristicLab.Problems.VehicleRouting {
38  [Item("Vehicle Routing Problem", "Represents a Vehicle Routing Problem.")]
39  [Creatable("Problems")]
40  [StorableClass]
41  public sealed class VehicleRoutingProblem : ParameterizedNamedItem, ISingleObjectiveProblem {
42    public override Image ItemImage {
43      get { return HeuristicLab.Common.Resources.VS2008ImageLibrary.Type; }
44    }
45
46    #region Parameter Properties
47    public ValueParameter<BoolValue> MaximizationParameter {
48      get { return (ValueParameter<BoolValue>)Parameters["Maximization"]; }
49    }
50    IParameter ISingleObjectiveProblem.MaximizationParameter {
51      get { return MaximizationParameter; }
52    }
53    public ValueParameter<DoubleMatrix> CoordinatesParameter {
54      get { return (ValueParameter<DoubleMatrix>)Parameters["Coordinates"]; }
55    }
56    public OptionalValueParameter<DoubleMatrix> DistanceMatrixParameter {
57      get { return (OptionalValueParameter<DoubleMatrix>)Parameters["DistanceMatrix"]; }
58    }
59    public ValueParameter<BoolValue> UseDistanceMatrixParameter {
60      get { return (ValueParameter<BoolValue>)Parameters["UseDistanceMatrix"]; }
61    }
62    public ValueParameter<IntValue> VehiclesParameter {
63      get { return (ValueParameter<IntValue>)Parameters["Vehicles"]; }
64    }
65    public ValueParameter<DoubleValue> CapacityParameter {
66      get { return (ValueParameter<DoubleValue>)Parameters["Capacity"]; }
67    }
68    public ValueParameter<DoubleArray> DemandParameter {
69      get { return (ValueParameter<DoubleArray>)Parameters["Demand"]; }
70    }
71    public ValueParameter<DoubleArray> ReadyTimeParameter {
72      get { return (ValueParameter<DoubleArray>)Parameters["ReadyTime"]; }
73    }
74    public ValueParameter<DoubleArray> DueTimeParameter {
75      get { return (ValueParameter<DoubleArray>)Parameters["DueTime"]; }
76    }
77    public ValueParameter<DoubleArray> ServiceTimeParameter {
78      get { return (ValueParameter<DoubleArray>)Parameters["ServiceTime"]; }
79    }
80    ValueParameter<IVRPCreator> SolutionCreatorParameter {
81      get { return (ValueParameter<IVRPCreator>)Parameters["SolutionCreator"]; }
82    }
83    IParameter IProblem.SolutionCreatorParameter {
84      get { return SolutionCreatorParameter; }
85    }
86    ValueParameter<IVRPEvaluator> EvaluatorParameter {
87      get { return (ValueParameter<IVRPEvaluator>)Parameters["Evaluator"]; }
88    }
89    IParameter IProblem.EvaluatorParameter {
90      get { return EvaluatorParameter; }
91    }
92    public IValueParameter<DoubleValue> FleetUsageFactor {
93      get { return (IValueParameter<DoubleValue>)Parameters["EvalFleetUsageFactor"]; }
94    }
95    public IValueParameter<DoubleValue> TimeFactor {
96      get { return (IValueParameter<DoubleValue>)Parameters["EvalTimeFactor"]; }
97    }
98    public IValueParameter<DoubleValue> DistanceFactor {
99      get { return (IValueParameter<DoubleValue>)Parameters["EvalDistanceFactor"]; }
100    }
101    public IValueParameter<DoubleValue> OverloadPenalty {
102      get { return (IValueParameter<DoubleValue>)Parameters["EvalOverloadPenalty"]; }
103    }
104    public IValueParameter<DoubleValue> TardinessPenalty {
105      get { return (IValueParameter<DoubleValue>)Parameters["EvalTardinessPenalty"]; }
106    }
107    public OptionalValueParameter<DoubleValue> BestKnownQualityParameter {
108      get { return (OptionalValueParameter<DoubleValue>)Parameters["BestKnownQuality"]; }
109    }
110    IParameter ISingleObjectiveProblem.BestKnownQualityParameter {
111      get { return BestKnownQualityParameter; }
112    }
113    #endregion
114
115    #region Properties
116    public DoubleMatrix Coordinates {
117      get { return CoordinatesParameter.Value; }
118      set { CoordinatesParameter.Value = value; }
119    }
120    public DoubleMatrix DistanceMatrix {
121      get { return DistanceMatrixParameter.Value; }
122      set { DistanceMatrixParameter.Value = value; }
123    }
124    public BoolValue UseDistanceMatrix {
125      get { return UseDistanceMatrixParameter.Value; }
126      set { UseDistanceMatrixParameter.Value = value; }
127    }
128    public IntValue Vehicles {
129      get { return VehiclesParameter.Value; }
130      set { VehiclesParameter.Value = value; }
131    }
132    public DoubleValue Capacity {
133      get { return CapacityParameter.Value; }
134      set { CapacityParameter.Value = value; }
135    }
136    public DoubleArray Demand {
137      get { return DemandParameter.Value; }
138      set { DemandParameter.Value = value; }
139    }
140    public DoubleArray ReadyTime {
141      get { return ReadyTimeParameter.Value; }
142      set { ReadyTimeParameter.Value = value; }
143    }
144    public DoubleArray DueTime {
145      get { return DueTimeParameter.Value; }
146      set { DueTimeParameter.Value = value; }
147    }
148    public DoubleArray ServiceTime {
149      get { return ServiceTimeParameter.Value; }
150      set { ServiceTimeParameter.Value = value; }
151    }
152    public DoubleValue BestKnownQuality {
153      get { return BestKnownQualityParameter.Value; }
154      set { BestKnownQualityParameter.Value = value; }
155    }
156    IVRPCreator SolutionCreator {
157      get { return SolutionCreatorParameter.Value; }
158      set { SolutionCreatorParameter.Value = value; }
159    }
160    ISolutionCreator IProblem.SolutionCreator {
161      get { return SolutionCreatorParameter.Value; }
162    }
163    IVRPEvaluator Evaluator {
164      get { return EvaluatorParameter.Value; }
165      set { EvaluatorParameter.Value = value; }
166    }
167    ISingleObjectiveEvaluator ISingleObjectiveProblem.Evaluator {
168      get { return EvaluatorParameter.Value; }
169    }
170    IEvaluator IProblem.Evaluator {
171      get { return EvaluatorParameter.Value; }
172    }
173    public IEnumerable<IOperator> Operators {
174      get { return operators; }
175    }
176    private BestVRPSolutionAnalyzer BestVRPSolutionAnalyzer {
177      get { return operators.OfType<BestVRPSolutionAnalyzer>().FirstOrDefault(); }
178    }
179    #endregion
180
181    [Storable]
182    private List<IOperator> operators;
183
184    [StorableConstructor]
185    private VehicleRoutingProblem(bool deserializing) : base(deserializing) { }
186    public VehicleRoutingProblem()
187      : base() {
188      IVRPCreator creator = new RandomCreator();
189      IVRPEvaluator evaluator = new VRPEvaluator();
190
191      Parameters.Add(new ValueParameter<BoolValue>("Maximization", "Set to false as the Vehicle Routing Problem is a minimization problem.", new BoolValue(false)));
192      Parameters.Add(new ValueParameter<DoubleMatrix>("Coordinates", "The x- and y-Coordinates of the cities.", new DoubleMatrix()));
193      Parameters.Add(new OptionalValueParameter<DoubleMatrix>("DistanceMatrix", "The matrix which contains the distances between the cities."));
194      Parameters.Add(new ValueParameter<BoolValue>("UseDistanceMatrix", "True if a distance matrix should be calculated and used for evaluation, otherwise false.", new BoolValue(true)));
195      Parameters.Add(new ValueParameter<IntValue>("Vehicles", "The number of vehicles.", new IntValue(0)));
196      Parameters.Add(new ValueParameter<DoubleValue>("Capacity", "The capacity of each vehicle.", new DoubleValue(0)));
197      Parameters.Add(new ValueParameter<DoubleArray>("Demand", "The demand of each customer.", new DoubleArray()));
198      Parameters.Add(new ValueParameter<DoubleArray>("ReadyTime", "The ready time of each customer.", new DoubleArray()));
199      Parameters.Add(new ValueParameter<DoubleArray>("DueTime", "The due time of each customer.", new DoubleArray()));
200      Parameters.Add(new ValueParameter<DoubleArray>("ServiceTime", "The service time of each customer.", new DoubleArray()));
201      Parameters.Add(new OptionalValueParameter<DoubleValue>("BestKnownQuality", "The quality of the best known solution of this VRP instance."));
202      Parameters.Add(new ValueParameter<DoubleValue>("EvalFleetUsageFactor", "The fleet usage factor considered in the evaluation.", new DoubleValue(100)));
203      Parameters.Add(new ValueParameter<DoubleValue>("EvalTimeFactor", "The time factor considered in the evaluation.", new DoubleValue(0)));
204      Parameters.Add(new ValueParameter<DoubleValue>("EvalDistanceFactor", "The distance factor considered in the evaluation.", new DoubleValue(1)));
205      Parameters.Add(new ValueParameter<DoubleValue>("EvalOverloadPenalty", "The overload penalty considered in the evaluation.", new DoubleValue(100)));
206      Parameters.Add(new ValueParameter<DoubleValue>("EvalTardinessPenalty", "The tardiness penalty considered in the evaluation.", new DoubleValue(100)));
207
208      Parameters.Add(new ValueParameter<IVRPCreator>("SolutionCreator", "The operator which should be used to create new VRP solutions.", creator));
209      Parameters.Add(new ValueParameter<IVRPEvaluator>("Evaluator", "The operator which should be used to evaluate VRP solutions.", evaluator));
210
211      creator.VRPToursParameter.ActualName = "VRPTours";
212      evaluator.QualityParameter.ActualName = "VRPQuality";
213
214      InitializeRandomVRPInstance();
215
216      ParameterizeSolutionCreator();
217      ParameterizeEvaluator();
218
219      InitializeOperators();
220      AttachEventHandlers();
221    }
222
223    public override IDeepCloneable Clone(Cloner cloner) {
224      VehicleRoutingProblem clone = (VehicleRoutingProblem)base.Clone(cloner);
225      clone.operators = operators.Select(x => (IOperator)cloner.Clone(x)).ToList();
226      clone.DistanceMatrixParameter.Value = DistanceMatrixParameter.Value;
227      clone.AttachEventHandlers();
228      return clone;
229    }
230
231    #region Events
232    public event EventHandler SolutionCreatorChanged;
233    private void OnSolutionCreatorChanged() {
234      EventHandler handler = SolutionCreatorChanged;
235      if (handler != null) handler(this, EventArgs.Empty);
236    }
237    public event EventHandler EvaluatorChanged;
238    private void OnEvaluatorChanged() {
239      EventHandler handler = EvaluatorChanged;
240      if (handler != null) handler(this, EventArgs.Empty);
241    }
242    public event EventHandler OperatorsChanged;
243    private void OnOperatorsChanged() {
244      EventHandler handler = OperatorsChanged;
245      if (handler != null) handler(this, EventArgs.Empty);
246    }
247    public event EventHandler Reset;
248    private void OnReset() {
249      EventHandler handler = Reset;
250      if (handler != null) handler(this, EventArgs.Empty);
251    }
252    void VehiclesValue_ValueChanged(object sender, EventArgs e) {
253      ParameterizeSolutionCreator();
254    }
255    private void CoordinatesParameter_ValueChanged(object sender, EventArgs e) {
256      Coordinates.ItemChanged += new EventHandler<EventArgs<int, int>>(Coordinates_ItemChanged);
257      Coordinates.Reset += new EventHandler(Coordinates_Reset);
258      ParameterizeSolutionCreator();
259      ClearDistanceMatrix();
260    }
261    private void Coordinates_ItemChanged(object sender, EventArgs<int, int> e) {
262      ClearDistanceMatrix();
263    }
264    private void Coordinates_Reset(object sender, EventArgs e) {
265      ParameterizeSolutionCreator();
266      ClearDistanceMatrix();
267    }
268    private void SolutionCreatorParameter_ValueChanged(object sender, EventArgs e) {
269      ParameterizeSolutionCreator();
270      ParameterizeEvaluator();
271      ParameterizeAnalyzer();
272      ParameterizeOperators();
273      OnSolutionCreatorChanged();
274    }
275    private void SolutionCreator_PermutationParameter_ActualNameChanged(object sender, EventArgs e) {
276      ParameterizeEvaluator();
277      ParameterizeAnalyzer();
278      ParameterizeOperators();
279    }
280    private void EvaluatorParameter_ValueChanged(object sender, EventArgs e) {
281      Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged);
282      ParameterizeEvaluator();
283      UpdateMoveEvaluators();
284      ParameterizeAnalyzer();
285      OnEvaluatorChanged();
286    }
287    private void Evaluator_QualityParameter_ActualNameChanged(object sender, EventArgs e) {
288      ParameterizeAnalyzer();
289    }
290    private void TranslocationMoveParameter_ActualNameChanged(object sender, EventArgs e) {
291      string name = ((ILookupParameter<TranslocationMove>)sender).ActualName;
292      foreach (IPermutationTranslocationMoveOperator op in Operators.OfType<IPermutationTranslocationMoveOperator>()) {
293        op.TranslocationMoveParameter.ActualName = name;
294      }
295    }
296    #endregion
297
298    #region Helpers
299    [StorableHook(HookType.AfterDeserialization)]
300    private void AfterDeserializationHook() {
301      AttachEventHandlers();
302    }
303
304    private void AttachEventHandlers() {
305      CoordinatesParameter.ValueChanged += new EventHandler(CoordinatesParameter_ValueChanged);
306      Vehicles.ValueChanged += new EventHandler(VehiclesValue_ValueChanged);
307      Coordinates.ItemChanged += new EventHandler<EventArgs<int, int>>(Coordinates_ItemChanged);
308      Coordinates.Reset += new EventHandler(Coordinates_Reset);
309      SolutionCreatorParameter.ValueChanged += new EventHandler(SolutionCreatorParameter_ValueChanged);
310      EvaluatorParameter.ValueChanged += new EventHandler(EvaluatorParameter_ValueChanged);
311      Evaluator.QualityParameter.ActualNameChanged += new EventHandler(Evaluator_QualityParameter_ActualNameChanged);
312    }
313    private void InitializeOperators() {
314      operators = new List<IOperator>();
315      operators.Add(new BestVRPSolutionAnalyzer());
316      ParameterizeAnalyzer();
317      operators.AddRange(ApplicationManager.Manager.GetInstances<IVRPOperator>().Cast<IOperator>());
318      ParameterizeOperators();
319      UpdateMoveEvaluators();
320      InitializeMoveGenerators();
321    }
322    private void InitializeMoveGenerators() {
323      foreach (IAlbaTranslocationMoveOperator op in Operators.OfType<IAlbaTranslocationMoveOperator>()) {
324        if (op is IMoveGenerator) {
325          op.TranslocationMoveParameter.ActualNameChanged += new EventHandler(TranslocationMoveParameter_ActualNameChanged);
326        }
327      }
328
329    }
330    private void UpdateMoveEvaluators() {
331      ParameterizeOperators();
332      OnOperatorsChanged();
333    }
334    private void ParameterizeSolutionCreator() {
335      SolutionCreator.CitiesParameter.Value = new IntValue(Coordinates.Rows - 1);
336      SolutionCreator.VehiclesParameter.ActualName = VehiclesParameter.Name;
337      SolutionCreator.CoordinatesParameter.ActualName = CoordinatesParameter.Name;
338      Evaluator.DistanceMatrixParameter.ActualName = DistanceMatrixParameter.Name;
339      Evaluator.UseDistanceMatrixParameter.ActualName = UseDistanceMatrixParameter.Name;
340      SolutionCreator.CapacityParameter.ActualName = CapacityParameter.Name;
341      SolutionCreator.DemandParameter.ActualName = DemandParameter.Name;
342      SolutionCreator.ReadyTimeParameter.ActualName = ReadyTimeParameter.Name;
343      SolutionCreator.DueTimeParameter.ActualName = DueTimeParameter.Name;
344      SolutionCreator.ServiceTimeParameter.ActualName = ServiceTimeParameter.Name;
345    }
346    private void ParameterizeEvaluator() {
347      Evaluator.VRPToursParameter.ActualName = SolutionCreator.VRPToursParameter.ActualName;
348      Evaluator.CoordinatesParameter.ActualName = CoordinatesParameter.Name;
349      Evaluator.DistanceMatrixParameter.ActualName = DistanceMatrixParameter.Name;
350      Evaluator.UseDistanceMatrixParameter.ActualName = UseDistanceMatrixParameter.Name;
351      Evaluator.VehiclesParameter.ActualName = VehiclesParameter.Name;
352      Evaluator.CapacityParameter.ActualName = CapacityParameter.Name;
353      Evaluator.DemandParameter.ActualName = DemandParameter.Name;
354      Evaluator.ReadyTimeParameter.ActualName = ReadyTimeParameter.Name;
355      Evaluator.DueTimeParameter.ActualName = DueTimeParameter.Name;
356      Evaluator.ServiceTimeParameter.ActualName = ServiceTimeParameter.Name;
357      Evaluator.FleetUsageFactor.ActualName = FleetUsageFactor.Name;
358      Evaluator.TimeFactor.ActualName = TimeFactor.Name;
359      Evaluator.DistanceFactor.ActualName = DistanceFactor.Name;
360      Evaluator.OverloadPenalty.ActualName = OverloadPenalty.Name;
361      Evaluator.TardinessPenalty.ActualName = TardinessPenalty.Name;
362    }
363    private void ParameterizeAnalyzer() {
364      BestVRPSolutionAnalyzer.CoordinatesParameter.ActualName = CoordinatesParameter.Name;
365      BestVRPSolutionAnalyzer.QualityParameter.ActualName = Evaluator.QualityParameter.ActualName;
366      BestVRPSolutionAnalyzer.DistanceParameter.ActualName = Evaluator.DistanceParameter.ActualName;
367      BestVRPSolutionAnalyzer.OverloadParameter.ActualName = Evaluator.OverloadParameter.ActualName;
368      BestVRPSolutionAnalyzer.TardinessParameter.ActualName = Evaluator.TardinessParameter.ActualName;
369      BestVRPSolutionAnalyzer.VRPToursParameter.ActualName = SolutionCreator.VRPToursParameter.ActualName;
370      BestVRPSolutionAnalyzer.ResultsParameter.ActualName = "Results";
371    }
372    private void ParameterizeOperators() {
373      foreach (IVRPOperator op in Operators.OfType<IVRPOperator>()) {
374        if(op.CoordinatesParameter != null) op.CoordinatesParameter.ActualName = CoordinatesParameter.Name;
375        if(op.DistanceMatrixParameter != null) op.DistanceMatrixParameter.ActualName = DistanceMatrixParameter.Name;
376        if(op.UseDistanceMatrixParameter != null) op.UseDistanceMatrixParameter.ActualName = UseDistanceMatrixParameter.Name;
377        if(op.VehiclesParameter != null) op.VehiclesParameter.ActualName = VehiclesParameter.Name;
378        if(op.CapacityParameter != null) op.CapacityParameter.ActualName = CapacityParameter.Name;
379        if(op.DemandParameter != null) op.DemandParameter.ActualName = DemandParameter.Name;
380        if(op.ReadyTimeParameter != null) op.ReadyTimeParameter.ActualName = ReadyTimeParameter.Name;
381        if(op.DueTimeParameter != null) op.DueTimeParameter.ActualName = DueTimeParameter.Name;
382        if(op.ServiceTimeParameter != null) op.ServiceTimeParameter.ActualName = ServiceTimeParameter.Name;
383      }
384     
385      foreach (IVRPMoveOperator op in Operators.OfType<IVRPMoveOperator>()) {
386        op.VRPToursParameter.ActualName = SolutionCreator.VRPToursParameter.ActualName;
387      }
388
389      foreach (IVRPMoveEvaluator op in Operators.OfType<IVRPMoveEvaluator>()) {
390        op.FleetUsageFactor.ActualName = FleetUsageFactor.Name;
391        op.TimeFactor.ActualName = TimeFactor.Name;
392        op.DistanceFactor.ActualName = DistanceFactor.Name;
393        op.OverloadPenalty.ActualName = OverloadPenalty.Name;
394        op.TardinessPenalty.ActualName = TardinessPenalty.Name;
395        op.QualityParameter.ActualName = Evaluator.QualityParameter.ActualName;
396        op.VRPToursParameter.ActualName = SolutionCreator.VRPToursParameter.ActualName;
397      }
398      string translocationMove = Operators.OfType<IMoveGenerator>().OfType<IAlbaTranslocationMoveOperator>().First().TranslocationMoveParameter.ActualName;
399      foreach (IAlbaTranslocationMoveOperator op in Operators.OfType<IAlbaTranslocationMoveOperator>())
400        op.TranslocationMoveParameter.ActualName = translocationMove;
401
402      foreach (IVRPCrossover op in Operators.OfType<IVRPCrossover>()) {
403        op.ParentsParameter.ActualName = SolutionCreator.VRPToursParameter.ActualName;
404        op.ChildParameter.ActualName = SolutionCreator.VRPToursParameter.ActualName;
405      }
406
407      foreach (IVRPManipulator op in Operators.OfType<IVRPManipulator>()) {
408        op.VRPToursParameter.ActualName = SolutionCreator.VRPToursParameter.ActualName;
409      }
410    }
411    private void ClearDistanceMatrix() {
412      DistanceMatrixParameter.Value = null;
413    }
414    #endregion
415
416    public void ImportFromSolomon(string solomonFileName) {
417      SolomonParser parser = new SolomonParser(solomonFileName);
418      parser.Parse();
419
420      this.Name = parser.ProblemName;
421
422      Coordinates = new DoubleMatrix(parser.Coordinates);
423      Vehicles.Value = parser.Vehicles;
424      Capacity.Value = parser.Capacity;
425      Demand = new DoubleArray(parser.Demands);
426      ReadyTime = new DoubleArray(parser.Readytimes);
427      DueTime = new DoubleArray(parser.Duetimes);
428      ServiceTime = new DoubleArray(parser.Servicetimes);
429
430      OnReset();
431    }
432
433    private void InitializeRandomVRPInstance() {
434      System.Random rand = new System.Random();
435
436      int cities = 100;
437
438      Coordinates = new DoubleMatrix(cities + 1, 2);
439      Demand = new DoubleArray(cities + 1);
440      DueTime = new DoubleArray(cities + 1);
441      ReadyTime = new DoubleArray(cities + 1);
442      ServiceTime = new DoubleArray(cities + 1);
443
444      Vehicles.Value = 100;
445      Capacity.Value = 200;
446
447      for (int i = 0; i <= cities; i++) {
448        Coordinates[i, 0] = rand.Next(0, 100);
449        Coordinates[i, 1] = rand.Next(0, 100);
450
451        if (i == 0) {
452          Demand[i] = 0;
453          DueTime[i] = Int16.MaxValue;
454          ReadyTime[i] = 0;
455          ServiceTime[i] = 0;
456        } else {
457          Demand[i] = rand.Next(10, 50);
458          DueTime[i] = rand.Next((int)Math.Ceiling(VRPUtilities.CalculateDistance(0, i, Coordinates)), 1200);
459          ReadyTime[i] = DueTime[i] - rand.Next(0, 100);
460          ServiceTime[i] = 90;
461        }
462      }
463    }
464  }
465}
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