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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 ArrayIterator; |
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use function count; |
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use Countable; |
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use IteratorAggregate; |
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use JsonSerializable; |
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use function reset; |
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use function round; |
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use Traversable; |
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use function usort; |
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/** |
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* List of packed boxes. |
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* |
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* @author Doug Wright |
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*/ |
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class PackedBoxList implements IteratorAggregate, Countable, JsonSerializable |
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{ |
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/** |
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* List containing boxes. |
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* |
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* @var PackedBox[] |
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*/ |
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private $list = []; |
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/** |
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* Has this list already been sorted? |
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* |
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* @var bool |
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*/ |
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private $isSorted = false; |
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/** |
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* @return Traversable<PackedBox> |
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*/ |
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public function getIterator(): Traversable |
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{ |
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if (!$this->isSorted) { |
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usort($this->list, [$this, 'compare']); |
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$this->isSorted = true; |
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} |
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return new ArrayIterator($this->list); |
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} |
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/** |
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* Number of items in list. |
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*/ |
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public function count(): int |
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{ |
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return count($this->list); |
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} |
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public function insert(PackedBox $item): void |
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{ |
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$this->list[] = $item; |
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$this->isSorted = false; |
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} |
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/** |
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* Do a bulk insert. |
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* |
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* @internal |
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* |
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* @param PackedBox[] $boxes |
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*/ |
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public function insertFromArray(array $boxes): void |
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{ |
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foreach ($boxes as $box) { |
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$this->insert($box); |
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} |
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} |
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/** |
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* @internal |
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*/ |
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public function top(): PackedBox |
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{ |
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if (!$this->isSorted) { |
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usort($this->list, [$this, 'compare']); |
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$this->isSorted = true; |
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} |
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return reset($this->list); |
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} |
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private function compare(PackedBox $boxA, PackedBox $boxB): int |
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{ |
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$choice = $boxB->getItems()->count() <=> $boxA->getItems()->count(); |
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if ($choice === 0) { |
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$choice = $boxB->getInnerVolume() <=> $boxA->getInnerVolume(); |
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} |
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if ($choice === 0) { |
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$choice = $boxA->getWeight() <=> $boxB->getWeight(); |
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} |
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return $choice; |
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} |
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/** |
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* Calculate the average (mean) weight of the boxes. |
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*/ |
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public function getMeanWeight(): float |
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{ |
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$meanWeight = 0; |
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/** @var PackedBox $box */ |
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foreach ($this->list as $box) { |
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$meanWeight += $box->getWeight(); |
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} |
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return $meanWeight / count($this->list); |
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} |
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/** |
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* Calculate the average (mean) weight of the boxes. |
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*/ |
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public function getMeanItemWeight(): float |
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{ |
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$meanWeight = 0; |
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/** @var PackedBox $box */ |
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foreach ($this->list as $box) { |
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$meanWeight += $box->getItemWeight(); |
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} |
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return $meanWeight / count($this->list); |
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} |
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/** |
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* Calculate the variance in weight between these boxes. |
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*/ |
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public function getWeightVariance(): float |
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{ |
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$mean = $this->getMeanWeight(); |
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$weightVariance = 0; |
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/** @var PackedBox $box */ |
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foreach ($this->list as $box) { |
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$weightVariance += ($box->getWeight() - $mean) ** 2; |
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} |
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return round($weightVariance / count($this->list), 1); |
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} |
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/** |
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* Get volume utilisation of the set of packed boxes. |
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*/ |
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public function getVolumeUtilisation(): float |
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{ |
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$itemVolume = 0; |
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$boxVolume = 0; |
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/** @var PackedBox $box */ |
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foreach ($this as $box) { |
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$boxVolume += $box->getInnerVolume(); |
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/** @var PackedItem $item */ |
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foreach ($box->getItems() as $item) { |
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$itemVolume += ($item->getItem()->getWidth() * $item->getItem()->getLength() * $item->getItem()->getDepth()); |
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} |
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} |
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return round($itemVolume / $boxVolume * 100, 1); |
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} |
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public function jsonSerialize(): array |
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{ |
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return $this->list; |
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} |
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} |
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dvdoug /
BoxPacker
