#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 .
*/
#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", " Found in Lee:2010")] // TODO
[StorableClass]
public abstract class BinUtilizationEvaluator : EvaluatorBase
where D : class, IPackingPosition
where B : PackingShape
where I : PackingShape, IPackingItem {
[StorableConstructor]
protected BinUtilizationEvaluator(bool deserializing) : base(deserializing) { }
protected BinUtilizationEvaluator(BinUtilizationEvaluator original, Cloner cloner)
: base(original, cloner) {
}
public BinUtilizationEvaluator() : base() { }
protected override DoubleValue Evaluate() {
DoubleValue quality = new DoubleValue(0);
IPackingPlan plan = PackingPlanParameter.ActualValue;
B binMeasure = PackingBinMeasuresParameter.ActualValue;
ItemList 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);
//return quality;
}
public static DoubleValue CalculateBinUtilization(PackingPlan 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 new DoubleValue(result);
}
}
}