1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2016 Joseph Helm and Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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4 | *
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5 | * This file is part of HeuristicLab.
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6 | *
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7 | * HeuristicLab is free software: you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation, either version 3 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * HeuristicLab is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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19 | */
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20 | #endregion
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21 |
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22 | using HeuristicLab.Core;
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23 | using HeuristicLab.Encodings.PermutationEncoding;
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24 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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25 | using HeuristicLab.Problems.BinPacking3D;
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26 | using System;
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27 | using System.Collections.Generic;
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28 | using System.Linq;
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29 | using System.Text;
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30 | using System.Threading.Tasks;
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31 |
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32 | namespace HeuristicLab.Problems.BinPacking3D.Packer {
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33 | [Item("BinPacker", "A class for packing bins for the 3D bin-packer problem.")]
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34 | [StorableClass]
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35 | public abstract class BinPacker {
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36 |
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37 | public BinPacker() { }
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38 |
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39 | /// <summary>
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40 | /// Packs all items of the bin packer and returns a collection of BinPacking3D objects
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41 | /// </summary>
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42 | /// <param name="sortedItems">Permutation of items sorted by a sorting method. The value of each permutation index references to the index of the items list</param>
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43 | /// <param name="binShape">Bin for storing the items</param>
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44 | /// <param name="items">A list of packing items which should be assigned to a bin</param>
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45 | /// <param name="useStackingConstraints">Flag for using stacking constraints</param>
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46 | /// <returns></returns>
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47 | public abstract IList<BinPacking3D> PackItems(Permutation sortedItems, PackingShape binShape, IList<PackingItem> items, bool useStackingConstraints);
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48 |
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49 |
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50 |
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51 | /// <summary>
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52 | /// Pack a given item into a given bin and updates the residual space and the extreme points
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53 | /// </summary>
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54 | /// <param name="packingBin"></param>
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55 | /// <param name="itemId"></param>
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56 | /// <param name="packingItem"></param>
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57 | /// <param name="position"></param>
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58 | protected void PackItem(ref BinPacking3D packingBin, int itemId, PackingItem packingItem, PackingPosition position, bool useStackingConstraints) {
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59 |
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60 | packingBin.PackItem(itemId, packingItem, position);
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61 | packingBin.UpdateResidualSpace(packingItem, position);
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62 | packingBin.UpdateExtremePoints(packingItem, position, useStackingConstraints);
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63 | }
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64 |
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65 | /// <summary>
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66 | /// This method tries to find a valid packing position for an given item in a given packing bin
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67 | /// </summary>
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68 | /// <param name="packingBin"></param>
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69 | /// <param name="packingItem"></param>
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70 | /// <param name="useStackingConstraints"></param>
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71 | /// <param name="rotated"></param>
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72 | /// <returns>Returns the packing position for an given item. If there could not be found a valid position it returns null</returns>
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73 | protected PackingPosition FindPackingPositionForItem(BinPacking3D packingBin, PackingItem packingItem, bool useStackingConstraints, bool rotated) {
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74 | PackingItem newItem = new PackingItem(
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75 | rotated ? packingItem.Depth : packingItem.Width,
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76 | packingItem.Height,
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77 | rotated ? packingItem.Width : packingItem.Depth,
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78 | packingItem.TargetBin, packingItem.Weight, packingItem.Material);
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79 |
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80 | // The extremepoints are sortet by Z, X, Y
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81 |
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82 | return packingBin.ExtremePoints.Where(x => packingBin.IsPositionFeasible(newItem, x, useStackingConstraints)).FirstOrDefault();
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83 | }
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84 | }
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85 | }
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