|
1
|
|
|
<?php |
|
2
|
|
|
/** |
|
3
|
|
|
* Box packing (3D bin packing, knapsack problem). |
|
4
|
|
|
* |
|
5
|
|
|
* @author Doug Wright |
|
6
|
|
|
*/ |
|
7
|
|
|
declare(strict_types=1); |
|
8
|
|
|
|
|
9
|
|
|
namespace DVDoug\BoxPacker; |
|
10
|
|
|
|
|
11
|
|
|
use function max; |
|
12
|
|
|
use Psr\Log\LoggerAwareInterface; |
|
13
|
|
|
use Psr\Log\LoggerInterface; |
|
14
|
|
|
use Psr\Log\NullLogger; |
|
15
|
|
|
|
|
16
|
|
|
/** |
|
17
|
|
|
* Layer packer. |
|
18
|
|
|
* |
|
19
|
|
|
* @internal |
|
20
|
|
|
* @author Doug Wright |
|
21
|
|
|
*/ |
|
22
|
|
|
class LayerPacker implements LoggerAwareInterface |
|
23
|
|
|
{ |
|
24
|
|
|
/** |
|
25
|
|
|
* The logger instance. |
|
26
|
|
|
* |
|
27
|
|
|
* @var LoggerInterface |
|
28
|
|
|
*/ |
|
29
|
|
|
private $logger; |
|
30
|
|
|
|
|
31
|
|
|
/** |
|
32
|
|
|
* Box to pack items into. |
|
33
|
|
|
* |
|
34
|
|
|
* @var Box |
|
35
|
|
|
*/ |
|
36
|
|
|
private $box; |
|
37
|
|
|
|
|
38
|
|
|
/** |
|
39
|
|
|
* Whether the packer is in single-pass mode. |
|
40
|
|
|
* |
|
41
|
|
|
* @var bool |
|
42
|
|
|
*/ |
|
43
|
|
|
private $singlePassMode = false; |
|
44
|
|
|
|
|
45
|
|
|
/** |
|
46
|
|
|
* @var OrientatedItemFactory |
|
47
|
|
|
*/ |
|
48
|
|
|
private $orientatedItemFactory; |
|
49
|
|
|
|
|
50
|
|
|
/** |
|
51
|
|
|
* Constructor. |
|
52
|
|
|
*/ |
|
53
|
73 |
|
public function __construct(Box $box) |
|
54
|
|
|
{ |
|
55
|
73 |
|
$this->box = $box; |
|
56
|
73 |
|
$this->logger = new NullLogger(); |
|
57
|
|
|
|
|
58
|
73 |
|
$this->orientatedItemFactory = new OrientatedItemFactory($this->box); |
|
59
|
73 |
|
$this->orientatedItemFactory->setLogger($this->logger); |
|
60
|
73 |
|
} |
|
61
|
|
|
|
|
62
|
|
|
/** |
|
63
|
|
|
* Sets a logger. |
|
64
|
|
|
*/ |
|
65
|
73 |
|
public function setLogger(LoggerInterface $logger): void |
|
66
|
|
|
{ |
|
67
|
73 |
|
$this->logger = $logger; |
|
68
|
73 |
|
$this->orientatedItemFactory->setLogger($logger); |
|
69
|
73 |
|
} |
|
70
|
|
|
|
|
71
|
53 |
|
public function setSinglePassMode(bool $singlePassMode): void |
|
72
|
|
|
{ |
|
73
|
53 |
|
$this->singlePassMode = $singlePassMode; |
|
74
|
53 |
|
$this->orientatedItemFactory->setSinglePassMode($singlePassMode); |
|
75
|
53 |
|
} |
|
76
|
|
|
|
|
77
|
|
|
/** |
|
78
|
|
|
* Pack items into an individual vertical layer. |
|
79
|
|
|
*/ |
|
80
|
73 |
|
public function packLayer(ItemList &$items, PackedItemList $packedItemList, array $layers, int $z, int $layerWidth, int $lengthLeft, int $depthLeft, int $guidelineLayerDepth): PackedLayer |
|
81
|
|
|
{ |
|
82
|
73 |
|
$layer = new PackedLayer(); |
|
83
|
73 |
|
$prevItem = null; |
|
84
|
73 |
|
$x = $y = $rowLength = 0; |
|
85
|
73 |
|
$skippedItems = []; |
|
86
|
73 |
|
$remainingWeightAllowed = $this->getRemainingWeightAllowed($layers); |
|
87
|
|
|
|
|
88
|
73 |
|
while ($items->count() > 0) { |
|
89
|
73 |
|
$itemToPack = $items->extract(); |
|
90
|
|
|
|
|
91
|
|
|
//skip items that will never fit e.g. too heavy |
|
92
|
73 |
|
if ($itemToPack->getWeight() > $remainingWeightAllowed) { |
|
93
|
8 |
|
continue; |
|
94
|
|
|
} |
|
95
|
|
|
|
|
96
|
73 |
|
$orientatedItem = $this->orientatedItemFactory->getBestOrientation($itemToPack, $prevItem, $items, $layerWidth - $x, $lengthLeft, $depthLeft, $rowLength, $x, $y, $z, $packedItemList); |
|
97
|
|
|
|
|
98
|
73 |
|
if ($orientatedItem instanceof OrientatedItem) { |
|
99
|
73 |
|
$packedItem = PackedItem::fromOrientatedItem($orientatedItem, $x, $y, $z); |
|
100
|
73 |
|
$layer->insert($packedItem); |
|
101
|
73 |
|
$remainingWeightAllowed -= $itemToPack->getWeight(); |
|
102
|
73 |
|
$packedItemList->insert($packedItem); |
|
103
|
|
|
|
|
104
|
73 |
|
$rowLength = max($rowLength, $packedItem->getLength()); |
|
105
|
|
|
|
|
106
|
|
|
//Figure out if we can stack the next item vertically on top of this rather than side by side |
|
107
|
|
|
//e.g. when we've packed a tall item, and have just put a shorter one next to it. |
|
108
|
73 |
|
$this->packVerticallyInsideItemFootprint($layer, $packedItem, $packedItemList, $items, $remainingWeightAllowed, $guidelineLayerDepth, $rowLength, $x, $y, $z); |
|
109
|
73 |
|
$x += $packedItem->getWidth(); |
|
110
|
|
|
|
|
111
|
73 |
|
$prevItem = $orientatedItem; |
|
112
|
73 |
|
if ($items->count() === 0) { |
|
113
|
68 |
|
$items = ItemList::fromArray(array_merge($skippedItems, iterator_to_array($items)), true); |
|
114
|
68 |
|
$skippedItems = []; |
|
115
|
|
|
} |
|
116
|
73 |
|
continue; |
|
117
|
|
|
} |
|
118
|
|
|
|
|
119
|
66 |
|
if ($items->count() > 0) { // skip for now, move on to the next item |
|
120
|
53 |
|
$this->logger->debug("doesn't fit, skipping for now"); |
|
121
|
53 |
|
$skippedItems[] = $itemToPack; |
|
122
|
|
|
// abandon here if next item is the same, no point trying to keep going. Last time is not skipped, need that to trigger appropriate reset logic |
|
123
|
53 |
|
while ($items->count() > 1 && static::isSameDimensions($itemToPack, $items->top())) { |
|
124
|
24 |
|
$skippedItems[] = $items->extract(); |
|
125
|
|
|
} |
|
126
|
53 |
|
continue; |
|
127
|
|
|
} |
|
128
|
|
|
|
|
129
|
66 |
|
if ($x > 0) { |
|
130
|
65 |
|
$this->logger->debug('No more fit in width wise, resetting for new row'); |
|
131
|
65 |
|
$lengthLeft -= $rowLength; |
|
132
|
65 |
|
$y += $rowLength; |
|
133
|
65 |
|
$x = $rowLength = 0; |
|
134
|
65 |
|
$skippedItems[] = $itemToPack; |
|
135
|
65 |
|
$items = ItemList::fromArray(array_merge($skippedItems, iterator_to_array($items)), true); |
|
136
|
65 |
|
$skippedItems = []; |
|
137
|
65 |
|
$prevItem = null; |
|
138
|
65 |
|
continue; |
|
139
|
|
|
} |
|
140
|
|
|
|
|
141
|
55 |
|
$this->logger->debug('no items fit, so starting next vertical layer'); |
|
142
|
55 |
|
$skippedItems[] = $itemToPack; |
|
143
|
|
|
|
|
144
|
55 |
|
$items = ItemList::fromArray(array_merge($skippedItems, iterator_to_array($items)), true); |
|
145
|
|
|
|
|
146
|
55 |
|
return $layer; |
|
147
|
|
|
} |
|
148
|
|
|
|
|
149
|
71 |
|
return $layer; |
|
150
|
|
|
} |
|
151
|
|
|
|
|
152
|
73 |
|
private function packVerticallyInsideItemFootprint(PackedLayer $layer, PackedItem $packedItem, PackedItemList $packedItemList, ItemList &$items, int &$remainingWeightAllowed, int $guidelineLayerDepth, int $rowLength, int $x, int $y, int $z): void |
|
153
|
|
|
{ |
|
154
|
73 |
|
$stackableDepth = ($guidelineLayerDepth ?: $layer->getDepth()) - $packedItem->getDepth(); |
|
155
|
73 |
|
$stackedZ = $z + $packedItem->getDepth(); |
|
156
|
73 |
|
$stackSkippedItems = []; |
|
157
|
73 |
|
$stackedItem = $packedItem->toOrientatedItem(); |
|
158
|
73 |
|
while ($stackableDepth > 0 && $items->count() > 0) { |
|
159
|
19 |
|
$itemToTryStacking = $items->extract(); |
|
160
|
|
|
|
|
161
|
|
|
//skip items that will never fit |
|
162
|
19 |
|
if ($itemToTryStacking->getWeight() > $remainingWeightAllowed) { |
|
163
|
|
|
continue; |
|
164
|
|
|
} |
|
165
|
|
|
|
|
166
|
19 |
|
$stackedItem = $this->orientatedItemFactory->getBestOrientation($itemToTryStacking, $stackedItem, $items, $packedItem->getWidth(), $packedItem->getLength(), $stackableDepth, $rowLength, $x, $y, $stackedZ, $packedItemList); |
|
167
|
19 |
|
if ($stackedItem) { |
|
168
|
13 |
|
$packedStackedItem = PackedItem::fromOrientatedItem($stackedItem, $x, $y, $stackedZ); |
|
169
|
13 |
|
$layer->insert($packedStackedItem); |
|
170
|
13 |
|
$remainingWeightAllowed -= $itemToTryStacking->getWeight(); |
|
171
|
13 |
|
$packedItemList->insert($packedStackedItem); |
|
172
|
13 |
|
$stackableDepth -= $stackedItem->getDepth(); |
|
173
|
13 |
|
$stackedZ += $stackedItem->getDepth(); |
|
174
|
13 |
|
continue; |
|
175
|
|
|
} |
|
176
|
|
|
|
|
177
|
13 |
|
$stackSkippedItems[] = $itemToTryStacking; |
|
178
|
|
|
// abandon here if next item is the same, no point trying to keep going |
|
179
|
13 |
|
while ($items->count() > 0 && static::isSameDimensions($itemToTryStacking, $items->top())) { |
|
180
|
8 |
|
$stackSkippedItems[] = $items->extract(); |
|
181
|
|
|
} |
|
182
|
|
|
} |
|
183
|
73 |
|
$items = ItemList::fromArray(array_merge($stackSkippedItems, iterator_to_array($items)), true); |
|
184
|
73 |
|
} |
|
185
|
|
|
|
|
186
|
73 |
|
private function getRemainingWeightAllowed(array $layers): int |
|
187
|
|
|
{ |
|
188
|
73 |
|
$remainingWeightAllowed = $this->box->getMaxWeight() - $this->box->getEmptyWeight(); |
|
189
|
73 |
|
foreach ($layers as $layer) { |
|
190
|
54 |
|
$remainingWeightAllowed -= $layer->getWeight(); |
|
191
|
|
|
} |
|
192
|
|
|
|
|
193
|
73 |
|
return $remainingWeightAllowed; |
|
194
|
|
|
} |
|
195
|
|
|
|
|
196
|
|
|
/** |
|
197
|
|
|
* Compare two items to see if they have same dimensions. |
|
198
|
|
|
*/ |
|
199
|
33 |
|
private static function isSameDimensions(Item $itemA, Item $itemB): bool |
|
200
|
|
|
{ |
|
201
|
33 |
|
if ($itemA === $itemB) { |
|
202
|
22 |
|
return true; |
|
203
|
|
|
} |
|
204
|
15 |
|
$itemADimensions = [$itemA->getWidth(), $itemA->getLength(), $itemA->getDepth()]; |
|
205
|
15 |
|
$itemBDimensions = [$itemB->getWidth(), $itemB->getLength(), $itemB->getDepth()]; |
|
206
|
15 |
|
sort($itemADimensions); |
|
207
|
15 |
|
sort($itemBDimensions); |
|
208
|
|
|
|
|
209
|
15 |
|
return $itemADimensions === $itemBDimensions; |
|
210
|
|
|
} |
|
211
|
|
|
} |
|
212
|
|
|
|
dvdoug /
BoxPacker
