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source: trunk/sources/HeuristicLab.Problems.TravelingSalesman/3.3/MoveEvaluators/ThreeOpt/TSPTranslocationMoveGeoPathEvaluator.cs @ 3232

Last change on this file since 3232 was 3232, checked in by abeham, 14 years ago

Renamed operators according to the underlying operation #889

File size: 2.7 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 HeuristicLab.Core;
24using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
25
26namespace HeuristicLab.Problems.TravelingSalesman {
27  /// <summary>
28  /// An operator to evaluate translocation or insertion moves (3-opt).
29  /// </summary>
30  [Item("TSPTranslocationMoveGeoPathEvaluator", "Operator for evaluating a translocation or insertion move (3-opt) based on geo (world) distances.")]
31  [StorableClass]
32  public class TSPTranslocationMoveGeoPathEvaluator : TSPTranslocationMovePathEvaluator {
33    public override Type EvaluatorType {
34      get { return typeof(TSPGeoPathEvaluator); }
35    }
36
37    private const double PI = 3.141592;
38    private const double RADIUS = 6378.388;
39
40    /// <summary>
41    /// Calculates the distance between two points using the GEO distance metric (globe coordinates).
42    /// </summary>
43    /// <param name="x1">The x-coordinate of point 1.</param>
44    /// <param name="y1">The y-coordinate of point 1.</param>
45    /// <param name="x2">The x-coordinate of point 2.</param>
46    /// <param name="y2">The y-coordinate of point 2.</param>
47    /// <returns>The calculated distance.</returns>
48    protected override double CalculateDistance(double x1, double y1, double x2, double y2) {
49      double latitude1, longitude1, latitude2, longitude2;
50      double q1, q2, q3;
51      double length;
52
53      latitude1 = ConvertToRadian(x1);
54      longitude1 = ConvertToRadian(y1);
55      latitude2 = ConvertToRadian(x2);
56      longitude2 = ConvertToRadian(y2);
57
58      q1 = Math.Cos(longitude1 - longitude2);
59      q2 = Math.Cos(latitude1 - latitude2);
60      q3 = Math.Cos(latitude1 + latitude2);
61
62      length = (int)(RADIUS * Math.Acos(0.5 * ((1.0 + q1) * q2 - (1.0 - q1) * q3)) + 1.0);
63      return (length);
64    }
65
66    private double ConvertToRadian(double x) {
67      return PI * (Math.Truncate(x) + 5.0 * (x - Math.Truncate(x)) / 3.0) / 180.0;
68    }
69  }
70}
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