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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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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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* |
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* @author Doug Wright |
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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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* @var OrientatedItem[] |
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*/ |
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protected static $emptyBoxCache = []; |
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/** |
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* Get the best orientation for an item. |
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* |
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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 bool $isLastItem |
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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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* |
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* @return OrientatedItem|null |
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*/ |
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public function getBestOrientation( |
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Box $box, |
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Item $item, |
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$prevItem, |
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$nextItem, |
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$isLastItem, |
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$widthLeft, |
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$lengthLeft, |
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$depthLeft |
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) { |
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$possibleOrientations = $this->getPossibleOrientations($item, $prevItem, $widthLeft, $lengthLeft, $depthLeft); |
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$usableOrientations = $this->getUsableOrientations($possibleOrientations, $box, $item, $isLastItem); |
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if (empty($usableOrientations)) { |
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return null; |
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} |
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usort($usableOrientations, function (OrientatedItem $a, OrientatedItem $b) use ($widthLeft, $lengthLeft, $depthLeft, $nextItem) { |
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$orientationAWidthLeft = $widthLeft - $a->getWidth(); |
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$orientationALengthLeft = $lengthLeft - $a->getLength(); |
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$orientationBWidthLeft = $widthLeft - $b->getWidth(); |
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$orientationBLengthLeft = $lengthLeft - $b->getLength(); |
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$orientationAMinGap = min($orientationAWidthLeft, $orientationALengthLeft); |
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$orientationBMinGap = min($orientationBWidthLeft, $orientationBLengthLeft); |
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if ($orientationAMinGap === 0) { // prefer A if it leaves no gap |
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return -1; |
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} elseif ($orientationBMinGap === 0) { // prefer B if it leaves no gap |
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return 1; |
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} else { // prefer leaving room for next item in current row |
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if ($nextItem) { |
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$nextItemFitA = count($this->getPossibleOrientations($nextItem, $a, $orientationAWidthLeft, $orientationALengthLeft, $depthLeft)); |
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$nextItemFitB = count($this->getPossibleOrientations($nextItem, $b, $orientationBWidthLeft, $orientationBLengthLeft, $depthLeft)); |
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if ($nextItem && $nextItemFitA && !$nextItemFitB) { |
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return -1; |
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} elseif ($nextItem && $nextItemFitB && !$nextItemFitA) { |
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return 1; |
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} |
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} |
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// otherwise prefer leaving minimum possible gap |
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return min($orientationAWidthLeft, $orientationALengthLeft) - min($orientationBWidthLeft, $orientationBLengthLeft); |
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} |
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}); |
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$bestFit = reset($usableOrientations); |
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$this->logger->debug('Selected best fit orientation', ['orientation' => $bestFit]); |
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return $bestFit; |
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} |
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/** |
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* Find all possible orientations for an item. |
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* |
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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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* |
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* @return OrientatedItem[] |
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*/ |
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public function getPossibleOrientations( |
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Item $item, |
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$prevItem, |
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$widthLeft, |
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$lengthLeft, |
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$depthLeft |
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) { |
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$orientations = []; |
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//Special case items that are the same as what we just packed - keep orientation |
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/* @noinspection PhpNonStrictObjectEqualityInspection */ |
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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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* @param Item $item |
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* @param Box $box |
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* |
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* @return OrientatedItem[] |
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*/ |
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public function getPossibleOrientationsInEmptyBox(Item $item, Box $box) |
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{ |
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$cacheKey = $item->getWidth(). |
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'|'. |
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$item->getLength(). |
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'|'. |
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$item->getDepth(). |
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'|'. |
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($item->getKeepFlat() ? '2D' : '3D'). |
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'|'. |
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$box->getInnerWidth(). |
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'|'. |
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$box->getInnerLength(). |
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'|'. |
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$box->getInnerDepth(); |
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if (isset(static::$emptyBoxCache[$cacheKey])) { |
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$orientations = static::$emptyBoxCache[$cacheKey]; |
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} else { |
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$orientations = $this->getPossibleOrientations( |
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$item, |
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null, |
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$box->getInnerWidth(), |
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$box->getInnerLength(), |
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$box->getInnerDepth() |
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); |
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static::$emptyBoxCache[$cacheKey] = $orientations; |
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} |
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return $orientations; |
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} |
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/** |
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* @param OrientatedItem[] $possibleOrientations |
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* @param Box $box |
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* @param Item $item |
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* @param bool $isLastItem |
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* |
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* @return OrientatedItem[] |
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*/ |
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protected function getUsableOrientations( |
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$possibleOrientations, |
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Box $box, |
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Item $item, |
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$isLastItem |
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) { |
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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 ($possibleOrientations 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 = $stableOrientations; |
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} elseif (count($unstableOrientations) > 0) { |
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$orientationsInEmptyBox = $this->getPossibleOrientationsInEmptyBox($item, $box); |
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$stableOrientationsInEmptyBox = array_filter( |
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$orientationsInEmptyBox, |
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function (OrientatedItem $orientation) { |
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return $orientation->isStable(); |
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} |
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); |
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if ($isLastItem || count($stableOrientationsInEmptyBox) == 0) { |
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$orientationsToUse = $unstableOrientations; |
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} |
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} |
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return $orientationsToUse; |
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} |
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} |
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dvdoug /
BoxPacker
