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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 Countable; |
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use IteratorAggregate; |
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use Traversable; |
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/** |
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* List of items to be packed, ordered by volume. |
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* |
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* @author Doug Wright |
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*/ |
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class ItemList implements Countable, IteratorAggregate |
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{ |
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/** |
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* List containing items. |
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* |
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* @var Item[] |
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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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* @param Item $item |
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*/ |
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public function insert(Item $item) |
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{ |
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$this->list[] = $item; |
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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 Item[] $items |
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*/ |
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public function insertFromArray(array $items): void |
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{ |
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foreach ($items as $item) { |
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$this->insert($item); |
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} |
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} |
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/** |
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* Remove item from list. |
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* |
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* @param Item $item |
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*/ |
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public function remove(Item $item) |
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{ |
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foreach ($this->list as $key => $itemToCheck) { |
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if ($itemToCheck === $item) { |
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unset($this->list[$key]); |
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break; |
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} |
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} |
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} |
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/** |
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* @internal |
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* |
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* @return Item |
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*/ |
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public function extract(): Item |
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{ |
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if (!$this->isSorted) { |
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usort($this->list, [$this, 'compare']); |
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$this->isSorted = true; |
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} |
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return array_shift($this->list); |
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} |
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/** |
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* @internal |
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* |
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* @return Item |
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*/ |
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public function top(): Item |
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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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$temp = $this->list; |
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return reset($temp); |
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} |
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/** |
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* @return Traversable |
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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($this->list); |
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} |
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/** |
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* Number of items in list. |
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* |
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* @return int |
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*/ |
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public function count(): int |
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{ |
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return count($this->list); |
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} |
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/** |
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* @param Item $itemA |
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* @param Item $itemB |
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* |
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* @return int |
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*/ |
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private function compare(Item $itemA, Item $itemB): int |
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{ |
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$itemAVolume = $itemA->getWidth() * $itemA->getLength() * $itemA->getDepth(); |
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$itemBVolume = $itemB->getWidth() * $itemB->getLength() * $itemB->getDepth(); |
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$volumeDecider = $itemBVolume <=> $itemAVolume; |
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$weightDecider = $itemB->getWeight() - $itemA->getWeight(); |
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if ($volumeDecider !== 0) { |
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return $volumeDecider; |
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} elseif ($weightDecider !== 0) { |
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return $weightDecider; |
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} else { |
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return $itemA->getDescription() <=> $itemB->getDescription(); |
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} |
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} |
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} |
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dvdoug /
BoxPacker
