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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 array_merge; |
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use function max; |
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use function min; |
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use const PHP_INT_MAX; |
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/** |
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* A packed layer. |
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* @internal |
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*/ |
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class PackedLayer |
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{ |
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private int $startX = PHP_INT_MAX; |
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private int $endX = 0; |
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private int $startY = PHP_INT_MAX; |
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private int $endY = 0; |
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private int $startZ = PHP_INT_MAX; |
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private int $endZ = 0; |
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private int $weight = 0; |
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/** |
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* @var array<int, PackedItem[]> |
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*/ |
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protected array $itemsByRow = []; |
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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, int $rowNumber): void |
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{ |
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$this->itemsByRow[$rowNumber][] = $packedItem; |
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$this->weight += $packedItem->getItem()->getWeight(); |
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$this->startX = min($this->startX, $packedItem->getX()); |
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$this->endX = max($this->endX, $packedItem->getX() + $packedItem->getWidth()); |
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$this->startY = min($this->startY, $packedItem->getY()); |
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$this->endY = max($this->endY, $packedItem->getY() + $packedItem->getLength()); |
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$this->startZ = min($this->startZ, $packedItem->getZ()); |
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$this->endZ = max($this->endZ, $packedItem->getZ() + $packedItem->getDepth()); |
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} |
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/** |
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* Get the packed items. |
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* |
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* @return PackedItem[] |
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*/ |
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public function getItems(): array |
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{ |
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return array_merge(...$this->itemsByRow); |
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} |
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/** |
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* Get the packed items. |
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*/ |
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public function getItemsByRow(): array |
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{ |
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return $this->itemsByRow; |
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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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return $this->getWidth() * $this->getLength(); |
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} |
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public function getStartX(): int |
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{ |
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return $this->startX; |
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} |
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public function getEndX(): int |
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{ |
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return $this->endX; |
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} |
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public function getWidth(): int |
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{ |
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return $this->endX ? $this->endX - $this->startX : 0; |
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} |
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1 |
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public function getStartY(): int |
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{ |
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return $this->startY; |
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} |
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public function getEndY(): int |
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{ |
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return $this->endY; |
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} |
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public function getLength(): int |
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{ |
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return $this->endY ? $this->endY - $this->startY : 0; |
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} |
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92 |
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public function getStartZ(): int |
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{ |
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return $this->startZ; |
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} |
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public function getEndZ(): int |
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{ |
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return $this->endZ; |
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} |
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public function getDepth(): int |
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{ |
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return $this->endZ ? $this->endZ - $this->startZ : 0; |
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} |
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1 |
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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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public function merge(self $otherLayer, int $rowNumber): void |
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{ |
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foreach ($otherLayer->getItems() as $packedItem) { |
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$this->insert($packedItem, $rowNumber); |
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} |
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} |
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} |
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dvdoug /
BoxPacker
