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<?php |
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/** |
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* Box packing (3D bin packing, knapsack problem) |
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* @package BoxPacker |
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* @author Doug Wright |
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*/ |
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namespace DVDoug\BoxPacker; |
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use Psr\Log\LoggerAwareInterface; |
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use Psr\Log\LoggerAwareTrait; |
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/** |
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* Figure out orientations for an item and a given set of dimensions |
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* @author Doug Wright |
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* @package BoxPacker |
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*/ |
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class OrientatedItemFactory implements LoggerAwareInterface |
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{ |
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use LoggerAwareTrait; |
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/** |
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* Get the best orientation for an item |
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* @param Box $box |
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* @param Item $item |
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* @param OrientatedItem|null $prevItem |
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* @param Item|null $nextItem |
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* @param int $widthLeft |
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* @param int $lengthLeft |
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* @param int $depthLeft |
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* @return OrientatedItem|false |
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*/ |
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public function getBestOrientation(Box $box, Item $item, OrientatedItem $prevItem = null, Item $nextItem = null, $widthLeft, $lengthLeft, $depthLeft) { |
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$orientations = $this->getPossibleOrientations($item, $prevItem, $widthLeft, $lengthLeft, $depthLeft); |
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/* |
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* Divide possible orientations into stable (low centre of gravity) and unstable (high centre of gravity) |
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*/ |
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$stableOrientations = []; |
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$unstableOrientations = []; |
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foreach ($orientations as $o => $orientation) { |
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if ($orientation->isStable()) { |
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$stableOrientations[] = $orientation; |
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} else { |
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$unstableOrientations[] = $orientation; |
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} |
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} |
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$orientationsToUse = []; |
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/* |
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* We prefer to use stable orientations only, but allow unstable ones if either |
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* the item is the last one left to pack OR |
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* the item doesn't fit in the box any other way |
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*/ |
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if (count($stableOrientations) > 0) { |
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$orientationsToUse = $stableOrientations; |
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} else if (count($unstableOrientations) > 0) { |
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$orientationsInEmptyBox = $this->getPossibleOrientations( |
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$item, |
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$prevItem, |
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$box->getInnerWidth(), |
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$box->getInnerLength(), |
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$box->getInnerDepth() |
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); |
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$stableOrientationsInEmptyBox = array_filter( |
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$orientationsInEmptyBox, |
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function(OrientatedItem $orientation) { |
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return $orientation->isStable(); |
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} |
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); |
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if (is_null($nextItem) || count($stableOrientationsInEmptyBox) == 0) { |
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$orientationsToUse = $unstableOrientations; |
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} |
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} |
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$orientationFits = []; |
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/** @var OrientatedItem $orientation */ |
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foreach ($orientationsToUse as $o => $orientation) { |
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$orientationFit = min($widthLeft - $orientation->getWidth(), $lengthLeft - $orientation->getLength()); |
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$orientationFits[$o] = $orientationFit; |
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} |
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if (!empty($orientationFits)) { |
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asort($orientationFits); |
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reset($orientationFits); |
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$bestFit = $orientationsToUse[key($orientationFits)]; |
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$this->logger->debug("Selected best fit orientation", ['orientation' => $bestFit]); |
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return $bestFit; |
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} else { |
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return false; |
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} |
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} |
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/** |
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* Find all possible orientations for an item |
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* @param Item $item |
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* @param OrientatedItem|null $prevItem |
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* @param int $widthLeft |
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* @param int $lengthLeft |
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* @param int $depthLeft |
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* @return OrientatedItem[] |
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*/ |
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public function getPossibleOrientations(Item $item, OrientatedItem $prevItem = null, $widthLeft, $lengthLeft, $depthLeft) { |
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$orientations = []; |
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//Special case items that are the same as what we just packed - keep orientation |
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if ($prevItem && $prevItem->getItem() == $item) { |
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$orientations[] = new OrientatedItem($item, $prevItem->getWidth(), $prevItem->getLength(), $prevItem->getDepth()); |
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} else { |
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//simple 2D rotation |
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$orientations[] = new OrientatedItem($item, $item->getWidth(), $item->getLength(), $item->getDepth()); |
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$orientations[] = new OrientatedItem($item, $item->getLength(), $item->getWidth(), $item->getDepth()); |
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//add 3D rotation if we're allowed |
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if (!$item->getKeepFlat()) { |
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$orientations[] = new OrientatedItem($item, $item->getWidth(), $item->getDepth(), $item->getLength()); |
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$orientations[] = new OrientatedItem($item, $item->getLength(), $item->getDepth(), $item->getWidth()); |
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$orientations[] = new OrientatedItem($item, $item->getDepth(), $item->getWidth(), $item->getLength()); |
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$orientations[] = new OrientatedItem($item, $item->getDepth(), $item->getLength(), $item->getWidth()); |
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} |
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} |
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//remove any that simply don't fit |
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return array_filter($orientations, function (OrientatedItem $i) use ($widthLeft, $lengthLeft, $depthLeft) { |
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return $i->getWidth() <= $widthLeft && $i->getLength() <= $lengthLeft && $i->getDepth() <= $depthLeft; |
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}); |
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} |
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} |
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dvdoug /
BoxPacker
