source: trunk/sources/HeuristicLab.Problems.BinPacking/3.3/3D/Evaluators/BinUtilizationEvaluator.cs @ 14162

Last change on this file since 14162 was 14162, checked in by gkronber, 5 years ago

#2641: first import of bin packing problem (TODO: persistence and sample)

File size: 2.3 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2016 Joseph Helm and 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.Linq;
24using HeuristicLab.Core;
25using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
26using HeuristicLab.Common;
27
28namespace HeuristicLab.Problems.BinPacking3D {
29  // NOTE: same implementation as for 2d problem
30  [Item("Bin-Utilization Evaluator (3d)", "Calculates the overall utilization of bin space.")]
31  [StorableClass]
32  public class BinUtilizationEvaluator : Item, IEvaluator {
33
34    [StorableConstructor]
35    protected BinUtilizationEvaluator(bool deserializing) : base(deserializing) { }
36    protected BinUtilizationEvaluator(BinUtilizationEvaluator original, Cloner cloner)
37      : base(original, cloner) {
38    }
39    public BinUtilizationEvaluator() : base() { }
40    public override IDeepCloneable Clone(Cloner cloner) {
41      return new BinUtilizationEvaluator(this, cloner);
42    }
43
44    #region IEvaluator Members
45    public double Evaluate(Solution solution) {
46      return CalculateBinUtilization(solution);
47    }
48
49
50    public static double CalculateBinUtilization(Solution solution) {
51      int nrOfBins = solution.NrOfBins;
52      double totalUsedSpace = 0;
53      double totalUsableSpace = 0;
54
55      for (int i = 0; i < nrOfBins; i++) {
56        totalUsableSpace += solution.BinPackings[i].BinShape.Volume;
57        totalUsedSpace += solution.BinPackings[i].Items.Sum(kvp => kvp.Value.Volume);
58      }
59
60      return totalUsedSpace / totalUsableSpace;
61    }
62
63    #endregion
64  }
65}
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