1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2016 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 HeuristicLab.Common;
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24 | using HeuristicLab.Core;
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25 | using HeuristicLab.Persistence;
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26 |
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27 | namespace HeuristicLab.Problems.TravelingSalesman {
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28 | /// <summary>
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29 | /// An operator to evaluate inversion moves (2-opt).
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30 | /// </summary>
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31 | [Item("TSPInversionMoveGeoPathEvaluator", "Operator for evaluating an inversion move (2-opt) based on geo (world) distances.")]
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32 | [StorableType("394ccf1c-841c-4296-b043-f1006ff53274")]
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33 | public class TSPInversionMoveGeoPathEvaluator : TSPInversionMovePathEvaluator {
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34 | public override Type EvaluatorType {
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35 | get { return typeof(TSPGeoPathEvaluator); }
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36 | }
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37 |
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38 | private const double PI = 3.141592;
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39 | private const double RADIUS = 6378.388;
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40 |
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41 | [StorableConstructor]
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42 | protected TSPInversionMoveGeoPathEvaluator(StorableConstructorFlag deserializing) : base(deserializing) { }
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43 | protected TSPInversionMoveGeoPathEvaluator(TSPInversionMoveGeoPathEvaluator original, Cloner cloner) : base(original, cloner) { }
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44 | public TSPInversionMoveGeoPathEvaluator() : base() { }
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45 |
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46 | public override IDeepCloneable Clone(Cloner cloner) {
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47 | return new TSPInversionMoveGeoPathEvaluator(this, cloner);
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48 | }
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49 |
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50 | /// <summary>
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51 | /// Calculates the distance between two points using the GEO distance metric (globe coordinates).
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52 | /// </summary>
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53 | /// <param name="x1">The x-coordinate of point 1.</param>
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54 | /// <param name="y1">The y-coordinate of point 1.</param>
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55 | /// <param name="x2">The x-coordinate of point 2.</param>
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56 | /// <param name="y2">The y-coordinate of point 2.</param>
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57 | /// <returns>The calculated distance.</returns>
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58 | protected override double CalculateDistance(double x1, double y1, double x2, double y2) {
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59 | double latitude1, longitude1, latitude2, longitude2;
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60 | double q1, q2, q3;
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61 | double length;
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62 |
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63 | latitude1 = ConvertToRadian(x1);
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64 | longitude1 = ConvertToRadian(y1);
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65 | latitude2 = ConvertToRadian(x2);
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66 | longitude2 = ConvertToRadian(y2);
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67 |
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68 | q1 = Math.Cos(longitude1 - longitude2);
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69 | q2 = Math.Cos(latitude1 - latitude2);
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70 | q3 = Math.Cos(latitude1 + latitude2);
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71 |
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72 | length = (int)(RADIUS * Math.Acos(0.5 * ((1.0 + q1) * q2 - (1.0 - q1) * q3)) + 1.0);
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73 | return (length);
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74 | }
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75 |
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76 | private double ConvertToRadian(double x) {
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77 | return PI * (Math.Truncate(x) + 5.0 * (x - Math.Truncate(x)) / 3.0) / 180.0;
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78 | }
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79 | }
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80 | }
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