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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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* Applies load stability to generated result. |
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* |
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* @author Doug Wright |
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* @internal |
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*/ |
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class LayerStabiliser |
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{ |
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/** |
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* @param PackedLayer[] $packedLayers |
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* |
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* @return PackedLayer[] |
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*/ |
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public function stabilise(array $packedLayers) |
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{ |
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// first re-order according to footprint |
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$stabilisedLayers = []; |
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usort($packedLayers, [$this, 'compare']); |
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// then for each item in the layer, re-calculate each item's z position |
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$currentZ = 0; |
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foreach ($packedLayers as $oldZLayer) { |
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$oldZStart = $oldZLayer->getStartDepth(); |
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$newZLayer = new PackedLayer(); |
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foreach ($oldZLayer->getItems() as $oldZItem) { |
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$newZ = $oldZItem->getZ() - $oldZStart + $currentZ; |
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$newZItem = new PackedItem($oldZItem->getItem(), $oldZItem->getX(), $oldZItem->getY(), $newZ, $oldZItem->getWidth(), $oldZItem->getLength(), $oldZItem->getDepth()); |
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$newZLayer->insert($newZItem); |
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} |
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$stabilisedLayers[] = $newZLayer; |
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$currentZ += $newZLayer->getDepth(); |
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} |
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return $stabilisedLayers; |
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} |
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/** |
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* @param PackedLayer $layerA |
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* @param PackedLayer $layerB |
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* |
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* @return int |
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*/ |
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private function compare(PackedLayer $layerA, PackedLayer $layerB) |
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{ |
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return ($layerB->getFootprint() - $layerA->getFootprint()) ?: ($layerB->getDepth() - $layerA->getDepth()); |
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} |
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} |
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dvdoug /
BoxPacker
