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source: stable/HeuristicLab.Problems.TravelingSalesman/3.3/Evaluators/TSPGeoPathEvaluator.cs @ 17097

Last change on this file since 17097 was 17097, checked in by mkommend, 5 years ago

#2520: Merged 16565 - 16579 into stable.

File size: 3.1 KB
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1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2019 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 HeuristicLab.Common;
24using HeuristicLab.Core;
25using HEAL.Attic;
26
27namespace HeuristicLab.Problems.TravelingSalesman {
28  /// <summary>
29  /// An operator which evaluates TSP solutions given in path representation using the GEO distance metric (globe coordinates).
30  /// </summary>
31  [Item("TSPGeoPathEvaluator", "An operator which evaluates TSP solutions given in path representation using the GEO distance metric (globe coordinates).")]
32  [StorableType("A69C2CE3-6A89-4991-9743-4DE8F07149B9")]
33  public sealed class TSPGeoPathEvaluator : TSPCoordinatesPathEvaluator {
34    private const double PI = 3.141592;
35    private const double RADIUS = 6378.388;
36
37    [StorableConstructor]
38    private TSPGeoPathEvaluator(StorableConstructorFlag _) : base(_) { }
39    private TSPGeoPathEvaluator(TSPGeoPathEvaluator original, Cloner cloner) : base(original, cloner) { }
40    public TSPGeoPathEvaluator() : base() { }
41
42    public override IDeepCloneable Clone(Cloner cloner) {
43      return new TSPGeoPathEvaluator(this, cloner);
44    }
45   
46
47    /// <summary>
48    /// Calculates the distance between two points using the GEO distance metric (globe coordinates).
49    /// </summary>
50    /// <param name="x1">The x-coordinate of point 1.</param>
51    /// <param name="y1">The y-coordinate of point 1.</param>
52    /// <param name="x2">The x-coordinate of point 2.</param>
53    /// <param name="y2">The y-coordinate of point 2.</param>
54    /// <returns>The calculated distance.</returns>
55    protected override double CalculateDistance(double x1, double y1, double x2, double y2) {
56      double latitude1, longitude1, latitude2, longitude2;
57      double q1, q2, q3;
58      double length;
59
60      latitude1 = ConvertToRadian(x1);
61      longitude1 = ConvertToRadian(y1);
62      latitude2 = ConvertToRadian(x2);
63      longitude2 = ConvertToRadian(y2);
64
65      q1 = Math.Cos(longitude1 - longitude2);
66      q2 = Math.Cos(latitude1 - latitude2);
67      q3 = Math.Cos(latitude1 + latitude2);
68
69      length = (int)(RADIUS * Math.Acos(0.5 * ((1.0 + q1) * q2 - (1.0 - q1) * q3)) + 1.0);
70      return (length);
71    }
72
73    private double ConvertToRadian(double x) {
74      return PI * (Math.Truncate(x) + 5.0 * (x - Math.Truncate(x)) / 3.0) / 180.0;
75    }
76  }
77}
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