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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 JsonSerializable; |
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use Stringable; |
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use function atan; |
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use function min; |
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use function sort; |
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/** |
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* An item to be packed. |
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*/ |
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class OrientatedItem implements JsonSerializable, Stringable |
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{ |
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public readonly int $surfaceFootprint; |
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/** |
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* @var array<string, bool> |
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*/ |
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protected static array $stabilityCache = []; |
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/** |
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* @var int[] |
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*/ |
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protected array $dimensionsAsArray; |
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public function __construct( |
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public readonly Item $item, |
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public readonly int $width, |
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public readonly int $length, |
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public readonly int $depth |
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) { |
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$this->surfaceFootprint = $width * $length; |
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98 |
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$this->dimensionsAsArray = [$width, $length, $depth]; |
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sort($this->dimensionsAsArray); |
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} |
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/** |
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* Is this item stable (low centre of gravity), calculated as if the tipping point is >15 degrees. |
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* |
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* N.B. Assumes equal weight distribution. |
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*/ |
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public function isStable(): bool |
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{ |
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$cacheKey = $this->width . '|' . $this->length . '|' . $this->depth; |
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return static::$stabilityCache[$cacheKey] ?? (static::$stabilityCache[$cacheKey] = atan(min($this->length, $this->width) / ($this->depth ?: 1)) > 0.261); |
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} |
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97 |
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/** |
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* Is the supplied item the same size as this one? |
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* |
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* @internal |
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*/ |
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public function isSameDimensions(Item $item): bool |
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{ |
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if ($item === $this->item) { |
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return true; |
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} |
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$itemDimensions = [$item->getWidth(), $item->getLength(), $item->getDepth()]; |
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sort($itemDimensions); |
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return $this->dimensionsAsArray === $itemDimensions; |
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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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'item' => $this->item, |
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'width' => $this->width, |
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'length' => $this->length, |
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'depth' => $this->depth, |
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]; |
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} |
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public function __toString(): string |
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{ |
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return $this->width . '|' . $this->length . '|' . $this->depth; |
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} |
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} |
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dvdoug /
BoxPacker
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