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<?php |
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/** |
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* Box packing (3D bin packing, knapsack problem). |
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* |
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* @author Doug Wright |
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*/ |
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declare(strict_types=1); |
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namespace DVDoug\BoxPacker; |
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use function max; |
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use function min; |
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/** |
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* A packed layer. |
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* |
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* @author Doug Wright |
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* @internal |
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*/ |
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class PackedLayer |
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{ |
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/** |
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* @var int |
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*/ |
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private $startDepth = PHP_INT_MAX; |
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/** |
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* @var int |
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*/ |
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private $endDepth = 0; |
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/** |
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* @var int |
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*/ |
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private $weight = 0; |
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/** |
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* Items packed into this layer. |
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* |
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* @var PackedItem[] |
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*/ |
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protected $items = []; |
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/** |
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* Add a packed item to this layer. |
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*/ |
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public function insert(PackedItem $packedItem): void |
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{ |
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$this->items[] = $packedItem; |
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$this->weight += $packedItem->getItem()->getWeight(); |
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$this->startDepth = min($this->startDepth, $packedItem->getZ()); |
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$this->endDepth = max($this->endDepth, $packedItem->getZ() + $packedItem->getDepth()); |
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} |
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/** |
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* Get the packed items. |
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* |
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* @return PackedItem[] |
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*/ |
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53 |
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public function getItems(): array |
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{ |
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return $this->items; |
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} |
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/** |
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* Calculate footprint area of this layer. |
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* |
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* @return int mm^2 |
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*/ |
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public function getFootprint(): int |
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{ |
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30 |
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$layerWidth = 0; |
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30 |
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$layerLength = 0; |
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foreach ($this->items as $item) { |
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$layerWidth = max($layerWidth, $item->getX() + $item->getWidth()); |
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$layerLength = max($layerLength, $item->getY() + $item->getLength()); |
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} |
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return $layerWidth * $layerLength; |
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} |
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/** |
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* Calculate start depth of this layer. |
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* |
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* @return int mm |
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*/ |
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53 |
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public function getStartDepth(): int |
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{ |
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return $this->startDepth; |
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} |
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/** |
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* Calculate depth of this layer. |
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* |
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* @return int mm |
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*/ |
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53 |
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public function getDepth(): int |
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{ |
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return $this->endDepth - $this->getStartDepth(); |
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} |
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/** |
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* Calculate weight of this layer. |
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* |
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* @return int weight in grams |
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*/ |
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53 |
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public function getWeight(): int |
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{ |
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return $this->weight; |
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} |
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} |
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dvdoug /
BoxPacker
