source: branches/1966_HeuristicLab.BinPacking/HeuristicLab.Problems.BinPacking/3.3/Evaluators/BinUtilizationEvaluator.cs @ 16100

#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2015 Joseph Helm and Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
 *
 * HeuristicLab is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * HeuristicLab is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
 */
#endregion


using HeuristicLab.Core;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
using HeuristicLab.Data;
using HeuristicLab.Common;
using HeuristicLab.Encodings.PackingEncoding;

namespace HeuristicLab.Problems.BinPacking {
  [Item("Bin-Utilization Evaluator", "<Description missing> Found in Lee:2010")] // TODO
  [StorableClass]
  public abstract class BinUtilizationEvaluator<D, B, I> : EvaluatorBase<D, B, I>
    where D : class, IPackingPosition
    where B : PackingShape<D>
    where I : PackingShape<D>, IPackingItem {

    [StorableConstructor]
    protected BinUtilizationEvaluator(bool deserializing) : base(deserializing) { }
    protected BinUtilizationEvaluator(BinUtilizationEvaluator<D, B, I> original, Cloner cloner)
      : base(original, cloner) {
    }
    public BinUtilizationEvaluator() : base() { }

    protected override double Evaluate() {
      DoubleValue quality = new DoubleValue(0);

      IPackingPlan plan = PackingPlanParameter.ActualValue;
      B binMeasure = PackingBinMeasuresParameter.ActualValue;
      ItemList<I> itemMeasures = PackingItemMeasuresParameter.ActualValue;

      // TODO: check and remove code

      //Check if data is valid
      //if (plan.PackingItemPositions.Count != itemMeasures.Count)
      //  throw new Exception("ERROR: ItemMeasures.count does not match packingPosition.count");


      ////Check if any items are overlapping or not contained in their bins
      //bool itemPositionsAreValid = !HasOverlappingOrNotContainedItems(plan.PackingItemPositions, binMeasure, itemMeasures, nrOfBins);



      //if (itemPositionsAreValid)
      return CalculateBinUtilization(plan as PackingPlan<D, B, I>);

      //return quality;
    }

    public static double CalculateBinUtilization(PackingPlan<D, B, I> plan) {
      int nrOfBins = plan.NrOfBins;
      double result = 0;

      //for (int i = 0; i < nrOfBins; i++) {
      //  double usableSpace = plan.GetPackingBinMeasuresForBinNr(i).MultipliedMeasures;
      //  var indexes = plan.PackingItemPositions.Select((Value, Index) => new { Value, Index }).Where(s => s.Value.Value.AssignedBin == i).Select(s => s.Index);
      //  var packedItemsInThisBin = plan.PackingItemMeasures.Select((Value, Index) => new { Value, Index }).Where(s => indexes.Contains(s.Index));
      //  double usedSpaceInThisBin = packedItemsInThisBin.Select(s => s.Value.MultipliedMeasures).Sum();
      //  result += (usedSpaceInThisBin / usableSpace);
      //}

      //result = result / nrOfBins;
      //return new DoubleValue (result);

      double totalUsedSpace = 0;
      double totalUsableSpace = 0;

      for (int i = 0; i < nrOfBins; i++) {
        double usableSpace = plan.BinPackings[i].BinMeasures.Volume;
        //var indexes = plan.PackingItemPositions.Select((Value, Index) => new { Value, Index }).Where(s => s.Value.Value.AssignedBin == i).Select(s => s.Index);
        //var packedItemsInThisBin = plan.PackingItemMeasures.Select((Value, Index) => new { Value, Index }).Where(s => indexes.Contains(s.Index));
        //double usedSpaceInThisBin = packedItemsInThisBin.Select(s => s.Value.MultipliedMeasures).Sum();
        //result += (usedSpaceInThisBin / usableSpace);
        totalUsableSpace += usableSpace;
        //totalUsedSpace += usedSpaceInThisBin;
        totalUsedSpace += plan.BinPackings[i].PackingDensity * usableSpace;
      }

      result = totalUsedSpace / totalUsableSpace;
      return result;
    }
  }
}