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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 iterator_to_array; |
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use JsonSerializable; |
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use function max; |
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use function round; |
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/** |
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* A "box" with items. |
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* |
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* @author Doug Wright |
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*/ |
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class PackedBox implements JsonSerializable |
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{ |
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/** |
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* Box used. |
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* |
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* @var Box |
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*/ |
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protected $box; |
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/** |
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* Items in the box. |
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* |
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* @var PackedItemList |
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*/ |
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protected $items; |
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/** |
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* Total weight of items in the box. |
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* |
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* @var int |
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*/ |
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protected $itemWeight; |
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/** |
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* Volume used for items as % of box. |
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* |
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* @var float |
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*/ |
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protected $volumeUtilisation; |
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/** |
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* Get box used. |
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*/ |
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public function getBox(): Box |
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{ |
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return $this->box; |
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} |
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/** |
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* Get items packed. |
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*/ |
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public function getItems(): PackedItemList |
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{ |
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return $this->items; |
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} |
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/** |
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* Get packed weight. |
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* |
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* @return int weight in grams |
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*/ |
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public function getWeight(): int |
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{ |
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return $this->box->getEmptyWeight() + $this->getItemWeight(); |
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} |
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/** |
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* Get packed weight of the items only. |
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* |
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* @return int weight in grams |
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*/ |
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public function getItemWeight(): int |
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{ |
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if ($this->itemWeight !== null) { |
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return $this->itemWeight; |
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} |
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$this->itemWeight = 0; |
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/** @var PackedItem $item */ |
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foreach ($this->items as $item) { |
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$this->itemWeight += $item->getItem()->getWeight(); |
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} |
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return $this->itemWeight; |
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} |
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/** |
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* Get remaining width inside box for another item. |
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*/ |
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public function getRemainingWidth(): int |
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{ |
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return $this->box->getInnerWidth() - $this->getUsedWidth(); |
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} |
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/** |
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* Get remaining length inside box for another item. |
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*/ |
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public function getRemainingLength(): int |
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{ |
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return $this->box->getInnerLength() - $this->getUsedLength(); |
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} |
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/** |
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* Get remaining depth inside box for another item. |
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*/ |
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public function getRemainingDepth(): int |
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{ |
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return $this->box->getInnerDepth() - $this->getUsedDepth(); |
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} |
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/** |
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* Used width inside box for packing items. |
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*/ |
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public function getUsedWidth(): int |
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{ |
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$maxWidth = 0; |
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/** @var PackedItem $item */ |
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foreach ($this->items as $item) { |
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$maxWidth = max($maxWidth, $item->getX() + $item->getWidth()); |
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} |
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return $maxWidth; |
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} |
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/** |
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* Used length inside box for packing items. |
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*/ |
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public function getUsedLength(): int |
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{ |
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$maxLength = 0; |
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/** @var PackedItem $item */ |
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foreach ($this->items as $item) { |
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$maxLength = max($maxLength, $item->getY() + $item->getLength()); |
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} |
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return $maxLength; |
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} |
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/** |
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* Used depth inside box for packing items. |
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*/ |
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public function getUsedDepth(): int |
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{ |
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$maxDepth = 0; |
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/** @var PackedItem $item */ |
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foreach ($this->items as $item) { |
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$maxDepth = max($maxDepth, $item->getZ() + $item->getDepth()); |
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} |
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return $maxDepth; |
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} |
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/** |
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* Get remaining weight inside box for another item. |
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*/ |
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public function getRemainingWeight(): int |
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{ |
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return $this->box->getMaxWeight() - $this->getWeight(); |
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} |
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public function getInnerVolume(): int |
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{ |
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return $this->box->getInnerWidth() * $this->box->getInnerLength() * $this->box->getInnerDepth(); |
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} |
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/** |
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* Get used volume of the packed box. |
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*/ |
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public function getUsedVolume(): int |
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{ |
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return $this->items->getVolume(); |
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} |
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/** |
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* Get unused volume of the packed box. |
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*/ |
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public function getUnusedVolume(): int |
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{ |
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return $this->getInnerVolume() - $this->getUsedVolume(); |
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} |
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/** |
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* Get volume utilisation of the packed box. |
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*/ |
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public function getVolumeUtilisation(): float |
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{ |
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return $this->volumeUtilisation; |
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} |
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/** |
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* Constructor. |
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*/ |
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public function __construct(Box $box, PackedItemList $packedItemList) |
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{ |
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$this->box = $box; |
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$this->items = $packedItemList; |
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$this->volumeUtilisation = round($this->getUsedVolume() / ($this->getInnerVolume() ?: 1) * 100, 1); |
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} |
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public function jsonSerialize(): array |
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{ |
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return [ |
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'box' => [ |
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'reference' => $this->box->getReference(), |
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'innerWidth' => $this->box->getInnerWidth(), |
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'innerLength' => $this->box->getInnerLength(), |
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'innerDepth' => $this->box->getInnerDepth(), |
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], |
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'items' => iterator_to_array($this->items), |
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]; |
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} |
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} |
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