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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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namespace DVDoug\BoxPacker; |
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/** |
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* List of possible packed box choices, ordered by utilisation (item count, volume). |
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* |
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* @author Doug Wright |
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*/ |
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class PackedBoxList extends \SplMinHeap |
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{ |
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/** |
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* Average (mean) weight of boxes. |
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* |
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* @var float |
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*/ |
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protected $meanWeight; |
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/** |
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* Compare elements in order to place them correctly in the heap while sifting up. |
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* |
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* @see \SplMinHeap::compare() |
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* |
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* @param PackedBox $boxA |
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* @param PackedBox $boxB |
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* |
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* @return int |
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*/ |
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public function compare($boxA, $boxB) |
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{ |
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$choice = $boxA->getItems()->count() - $boxB->getItems()->count(); |
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if ($choice == 0) { |
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$choice = $boxA->getVolumeUtilisation() - $boxB->getVolumeUtilisation(); |
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} |
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if ($choice == 0) { |
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$choice = $boxA->getUsedVolume() - $boxB->getUsedVolume(); |
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} |
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if ($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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* Reversed version of compare. |
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* |
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* @deprecated |
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* |
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* @param PackedBox $boxA |
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* @param PackedBox $boxB |
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* |
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* @return int |
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*/ |
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public function reverseCompare($boxA, $boxB) |
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{ |
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$choice = $boxB->getItems()->count() - $boxA->getItems()->count(); |
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if ($choice === 0) { |
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$choice = $boxA->getBox()->getInnerVolume() - $boxB->getBox()->getInnerVolume(); |
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} |
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if ($choice === 0) { |
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$choice = $boxB->getWeight() - $boxA->getWeight(); |
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} |
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return $choice; |
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} |
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/** |
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* Calculate the average (mean) weight of the boxes. |
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* |
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* @return float |
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*/ |
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public function getMeanWeight() |
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{ |
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3 |
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if (!is_null($this->meanWeight)) { |
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return $this->meanWeight; |
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} |
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foreach (clone $this as $box) { |
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$this->meanWeight += $box->getWeight(); |
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} |
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return $this->meanWeight /= $this->count(); |
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} |
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/** |
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* Calculate the variance in weight between these boxes. |
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* |
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* @return float |
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*/ |
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public function getWeightVariance() |
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{ |
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$mean = $this->getMeanWeight(); |
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$weightVariance = 0; |
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foreach (clone $this as $box) { |
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$weightVariance += pow($box->getWeight() - $mean, 2); |
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} |
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return round($weightVariance / $this->count(), 1); |
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} |
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/** |
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* Get volume utilisation of the set of packed boxes. |
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* |
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* @return float |
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*/ |
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public function getVolumeUtilisation() |
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{ |
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1 |
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$itemVolume = 0; |
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$boxVolume = 0; |
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/** @var PackedBox $box */ |
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foreach (clone $this as $box) { |
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$boxVolume += $box->getBox()->getInnerVolume(); |
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/** @var Item $item */ |
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foreach (clone $box->getItems() as $item) { |
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$itemVolume += $item->getVolume(); |
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} |
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} |
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return round($itemVolume / $boxVolume * 100, 1); |
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} |
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/** |
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* Do a bulk insert. |
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* |
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* @param array $boxes |
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*/ |
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2 |
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public function insertFromArray(array $boxes) |
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{ |
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foreach ($boxes as $box) { |
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$this->insert($box); |
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} |
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2 |
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} |
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} |
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dvdoug /
BoxPacker
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