[3155] | 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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[3155] | 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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[4722] | 23 | using HeuristicLab.Common;
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[3155] | 24 | using HeuristicLab.Core;
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| 25 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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| 26 |
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[3158] | 27 | namespace HeuristicLab.Problems.TravelingSalesman {
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[3155] | 28 | /// <summary>
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| 29 | /// An operator which evaluates TSP solutions given in path representation using the GEO distance metric (globe coordinates).
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| 30 | /// </summary>
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| 31 | [Item("TSPGeoPathEvaluator", "An operator which evaluates TSP solutions given in path representation using the GEO distance metric (globe coordinates).")]
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| 32 | [StorableClass]
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| 33 | public sealed class TSPGeoPathEvaluator : TSPCoordinatesPathEvaluator {
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| 34 | private const double PI = 3.141592;
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| 35 | private const double RADIUS = 6378.388;
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| 36 |
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[4722] | 37 | [StorableConstructor]
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| 38 | private TSPGeoPathEvaluator(bool deserializing) : base(deserializing) { }
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| 39 | private TSPGeoPathEvaluator(TSPGeoPathEvaluator original, Cloner cloner) : base(original, cloner) { }
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| 40 | public TSPGeoPathEvaluator() : base() { }
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| 41 |
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| 42 | public override IDeepCloneable Clone(Cloner cloner) {
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| 43 | return new TSPGeoPathEvaluator(this, cloner);
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| 44 | }
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| 45 |
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| 46 |
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[3155] | 47 | /// <summary>
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| 48 | /// Calculates the distance between two points using the GEO distance metric (globe coordinates).
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| 49 | /// </summary>
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| 50 | /// <param name="x1">The x-coordinate of point 1.</param>
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| 51 | /// <param name="y1">The y-coordinate of point 1.</param>
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| 52 | /// <param name="x2">The x-coordinate of point 2.</param>
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| 53 | /// <param name="y2">The y-coordinate of point 2.</param>
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| 54 | /// <returns>The calculated distance.</returns>
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| 55 | protected override double CalculateDistance(double x1, double y1, double x2, double y2) {
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| 56 | double latitude1, longitude1, latitude2, longitude2;
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| 57 | double q1, q2, q3;
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| 58 | double length;
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| 59 |
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| 60 | latitude1 = ConvertToRadian(x1);
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| 61 | longitude1 = ConvertToRadian(y1);
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| 62 | latitude2 = ConvertToRadian(x2);
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| 63 | longitude2 = ConvertToRadian(y2);
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| 64 |
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| 65 | q1 = Math.Cos(longitude1 - longitude2);
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| 66 | q2 = Math.Cos(latitude1 - latitude2);
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| 67 | q3 = Math.Cos(latitude1 + latitude2);
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| 68 |
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| 69 | length = (int)(RADIUS * Math.Acos(0.5 * ((1.0 + q1) * q2 - (1.0 - q1) * q3)) + 1.0);
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| 70 | return (length);
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| 71 | }
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| 72 |
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| 73 | private double ConvertToRadian(double x) {
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| 74 | return PI * (Math.Truncate(x) + 5.0 * (x - Math.Truncate(x)) / 3.0) / 180.0;
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| 75 | }
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| 76 | }
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| 77 | }
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