LayerPacker::checkNonDimensionalConstraints() - Code Metrics - Inspection of "Split the lookahead part of the sort routine in a..." - dvdoug/BoxPacker - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( 34b8f8...cb2e0a )

by Doug

created 2020-04-12 19:31 UTC

LayerPacker::checkNonDimensionalConstraints() A

↳ Parent: LayerPacker

Complexity

Conditions	3
Paths	4

Size

Total Lines	8
Code Lines	4

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	5
CRAP Score	3

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	3
eloc	4
c	1
b	0
f	0
nc	4
nop	3
dl	0
loc	8
ccs	5
cts	5
cp	1
crap	3
rs	10

<?php
/**
 * Box packing (3D bin packing, knapsack problem).
 *
 * @author Doug Wright
 */
declare(strict_types=1);

namespace DVDoug\BoxPacker;

use function count;
use function max;
use Psr\Log\LoggerAwareInterface;
use Psr\Log\LoggerInterface;
use Psr\Log\NullLogger;

/**
 * Layer packer.
 *
 * @internal
 * @author Doug Wright
 */
class LayerPacker implements LoggerAwareInterface
{
    /**
     * The logger instance.
     *
     * @var LoggerInterface
     */
    private $logger;

    /**
     * Box to pack items into.
     *
     * @var Box
     */
    private $box;

    /**
     * Whether the packer is in single-pass mode.
     *
     * @var bool
     */
    private $singlePassMode = false;

    /**
     * @var OrientatedItemFactory
     */
    private $orientatedItemFactory;

    /**
     * Constructor.
     */
    public function __construct(Box $box)
    {
        $this->box = $box;
        $this->logger = new NullLogger();

        $this->orientatedItemFactory = new OrientatedItemFactory($this->box);
        $this->orientatedItemFactory->setLogger($this->logger);
    }

    /**
     * Sets a logger.
     */
    public function setLogger(LoggerInterface $logger): void
    {
        $this->logger = $logger;
        $this->orientatedItemFactory->setLogger($logger);
    }

    public function setSinglePassMode(bool $singlePassMode): void
    {
        $this->singlePassMode = $singlePassMode;
        $this->orientatedItemFactory->setSinglePassMode($singlePassMode);
    }

    /**
     * Pack items into an individual vertical layer.
     */
    public function packLayer(ItemList &$items, PackedItemList $packedItemList, array $layers, int $z, int $layerWidth, int $lengthLeft, int $depthLeft, int $guidelineLayerDepth): PackedLayer
    {
        $layer = new PackedLayer();
        $prevItem = null;
        $x = $y = $rowLength = 0;
        $skippedItems = [];
        $remainingWeightAllowed = $this->getRemainingWeightAllowed($layers);

        while ($items->count() > 0) {
            $itemToPack = $items->extract();

            //skip items that are simply too heavy or too large
            if (!$this->checkNonDimensionalConstraints($itemToPack, $remainingWeightAllowed, $packedItemList)) {
                continue;
            }

            $orientatedItem = $this->orientatedItemFactory->getBestOrientation($itemToPack, $prevItem instanceof PackedItem ? $prevItem->toOrientatedItem() : null, $items, $layerWidth - $x, $lengthLeft, $depthLeft, $rowLength, $x, $y, $z, $packedItemList);

            if ($orientatedItem instanceof OrientatedItem) {
                $packedItem = PackedItem::fromOrientatedItem($orientatedItem, $x, $y, $z);
                $layer->insert($packedItem);
                $remainingWeightAllowed -= $itemToPack->getWeight();
                $packedItemList->insert($packedItem);

                $rowLength = max($rowLength, $orientatedItem->getLength());

                //Figure out if we can stack the next item vertically on top of this rather than side by side
                //e.g. when we've packed a tall item, and have just put a shorter one next to it.
                $stackableDepth = ($guidelineLayerDepth ?: $layer->getDepth()) - $orientatedItem->getDepth();
                $stackedZ = $z + $orientatedItem->getDepth();
                $stackSkippedItems = [];
                while ($stackableDepth > 0 && $items->count() > 0) {
                    $itemToTryStacking = $items->extract();
                    $stackedItem = $this->orientatedItemFactory->getBestOrientation($itemToTryStacking, $prevItem instanceof PackedItem ? $prevItem->toOrientatedItem() : null, $items, $orientatedItem->getWidth(), $orientatedItem->getLength(), $stackableDepth, $rowLength, $x, $y, $stackedZ, $packedItemList);
                    if ($stackedItem && $this->checkNonDimensionalConstraints($itemToTryStacking, $remainingWeightAllowed, $packedItemList)) {
                        $layer->insert(PackedItem::fromOrientatedItem($stackedItem, $x, $y, $stackedZ));
                        $remainingWeightAllowed -= $itemToTryStacking->getWeight();
                        $packedItemList->insert($packedItem);
                        $stackableDepth -= $stackedItem->getDepth();
                        $stackedZ += $stackedItem->getDepth();
                    } else {
                        $stackSkippedItems[] = $itemToTryStacking;
                        // abandon here if next item is the same, no point trying to keep going. Last time is not skipped, need that to trigger appropriate reset logic
                        while ($items->count() > 0 && static::isSameDimensions($itemToTryStacking, $items->top())) {
                            $stackSkippedItems[] = $items->extract();
                        }
                    }
                }
                if ($stackSkippedItems) {
                    $items = ItemList::fromArray(array_merge($stackSkippedItems, iterator_to_array($items)), true);
                }
                $x += $orientatedItem->getWidth();

                $prevItem = $packedItem;
                if ($items->count() === 0) {
                    $items = ItemList::fromArray(array_merge($skippedItems, iterator_to_array($items)), true);
                    $skippedItems = [];
                }
            } elseif (count($layer->getItems()) === 0) { // zero items on layer
                $this->logger->debug("doesn't fit on layer even when empty, skipping for good");
                continue;
            } elseif ($items->count() > 0) { // skip for now, move on to the next item
                $this->logger->debug("doesn't fit, skipping for now");
                $skippedItems[] = $itemToPack;
                // abandon here if next item is the same, no point trying to keep going. Last time is not skipped, need that to trigger appropriate reset logic
                while ($items->count() > 2 && static::isSameDimensions($itemToPack, $items->top())) {
                    $skippedItems[] = $items->extract();
                }
            } elseif ($x > 0) {
                $this->logger->debug('No more fit in width wise, resetting for new row');
                $lengthLeft -= $rowLength;
                $y += $rowLength;
                $x = $rowLength = 0;
                $skippedItems[] = $itemToPack;
                $items = ItemList::fromArray(array_merge($skippedItems, iterator_to_array($items)), true);
                $skippedItems = [];
                $prevItem = null;
                continue;
            } else {
                $this->logger->debug('no items fit, so starting next vertical layer');
                $skippedItems[] = $itemToPack;

                $items = ItemList::fromArray(array_merge($skippedItems, iterator_to_array($items)), true);

                return $layer;
            }
        }

        return $layer;
    }

    /**
     * As well as purely dimensional constraints, there are other constraints that need to be met
     * e.g. weight limits or item-specific restrictions (e.g. max <x> batteries per box).
     */
    private function checkNonDimensionalConstraints(Item $itemToPack, int $remainingWeightAllowed, PackedItemList $packedItemList): bool
    {
        $customConstraintsOK = true;
        if ($itemToPack instanceof ConstrainedItem) {
            $customConstraintsOK = $itemToPack->canBePackedInBox($packedItemList, $this->box);
        }

        return $customConstraintsOK && $itemToPack->getWeight() <= $remainingWeightAllowed;
    }

    private function getRemainingWeightAllowed(array $layers): int
    {
        $remainingWeightAllowed = $this->box->getMaxWeight() - $this->box->getEmptyWeight();
        foreach ($layers as $layer) {
            $remainingWeightAllowed -= $layer->getWeight();
        }

        return $remainingWeightAllowed;
    }

    /**
     * Compare two items to see if they have same dimensions.
     */
    private static function isSameDimensions(Item $itemA, Item $itemB): bool
    {
        if ($itemA === $itemB) {
            return true;
        }
        $itemADimensions = [$itemA->getWidth(), $itemA->getLength(), $itemA->getDepth()];
        $itemBDimensions = [$itemB->getWidth(), $itemB->getLength(), $itemB->getDepth()];
        sort($itemADimensions);
        sort($itemBDimensions);

        return $itemADimensions === $itemBDimensions;
    }
}


1		<?php
2		/**
3		* Box packing (3D bin packing, knapsack problem).
4		*
5		* @author Doug Wright
6		*/
7		declare(strict_types=1);
8
9		namespace DVDoug\BoxPacker;
10
11		use function count;
12		use function max;
13		use Psr\Log\LoggerAwareInterface;
14		use Psr\Log\LoggerInterface;
15		use Psr\Log\NullLogger;
16
17		/**
18		* Layer packer.
19		*
20		* @internal
21		* @author Doug Wright
22		*/
23		class LayerPacker implements LoggerAwareInterface
24		{
25		/**
26		* The logger instance.
27		*
28		* @var LoggerInterface
29		*/
30		private $logger;
31
32		/**
33		* Box to pack items into.
34		*
35		* @var Box
36		*/
37		private $box;
38
39		/**
40		* Whether the packer is in single-pass mode.
41		*
42		* @var bool
43		*/
44		private $singlePassMode = false;
45
46		/**
47		* @var OrientatedItemFactory
48		*/
49		private $orientatedItemFactory;
50
51		/**
52		* Constructor.
53		*/
54	56	public function __construct(Box $box)
55		{
56	56	$this->box = $box;
57	56	$this->logger = new NullLogger();
58
59	56	$this->orientatedItemFactory = new OrientatedItemFactory($this->box);
60	56	$this->orientatedItemFactory->setLogger($this->logger);
61	56	}
62
63		/**
64		* Sets a logger.
65		*/
66	56	public function setLogger(LoggerInterface $logger): void
67		{
68	56	$this->logger = $logger;
69	56	$this->orientatedItemFactory->setLogger($logger);
70	56	}
71
72	51	public function setSinglePassMode(bool $singlePassMode): void
73		{
74	51	$this->singlePassMode = $singlePassMode;
75	51	$this->orientatedItemFactory->setSinglePassMode($singlePassMode);
76	51	}
77
78		/**
79		* Pack items into an individual vertical layer.
80		*/
81	56	public function packLayer(ItemList &$items, PackedItemList $packedItemList, array $layers, int $z, int $layerWidth, int $lengthLeft, int $depthLeft, int $guidelineLayerDepth): PackedLayer
82		{
83	56	$layer = new PackedLayer();
84	56	$prevItem = null;
85	56	$x = $y = $rowLength = 0;
86	56	$skippedItems = [];
87	56	$remainingWeightAllowed = $this->getRemainingWeightAllowed($layers);
88
89	56	while ($items->count() > 0) {
90	56	$itemToPack = $items->extract();
91
92		//skip items that are simply too heavy or too large
93	56	if (!$this->checkNonDimensionalConstraints($itemToPack, $remainingWeightAllowed, $packedItemList)) {
94	7	continue;
95		}
96
97	56	$orientatedItem = $this->orientatedItemFactory->getBestOrientation($itemToPack, $prevItem instanceof PackedItem ? $prevItem->toOrientatedItem() : null, $items, $layerWidth - $x, $lengthLeft, $depthLeft, $rowLength, $x, $y, $z, $packedItemList);
98
99	56	if ($orientatedItem instanceof OrientatedItem) {
100	56	$packedItem = PackedItem::fromOrientatedItem($orientatedItem, $x, $y, $z);
101	56	$layer->insert($packedItem);
102	56	$remainingWeightAllowed -= $itemToPack->getWeight();
103	56	$packedItemList->insert($packedItem);
104
105	56	$rowLength = max($rowLength, $orientatedItem->getLength());
106
107		//Figure out if we can stack the next item vertically on top of this rather than side by side
108		//e.g. when we've packed a tall item, and have just put a shorter one next to it.
109	56	$stackableDepth = ($guidelineLayerDepth ?: $layer->getDepth()) - $orientatedItem->getDepth();
110	56	$stackedZ = $z + $orientatedItem->getDepth();
111	56	$stackSkippedItems = [];
112	56	while ($stackableDepth > 0 && $items->count() > 0) {
113	17	$itemToTryStacking = $items->extract();
114	17	$stackedItem = $this->orientatedItemFactory->getBestOrientation($itemToTryStacking, $prevItem instanceof PackedItem ? $prevItem->toOrientatedItem() : null, $items, $orientatedItem->getWidth(), $orientatedItem->getLength(), $stackableDepth, $rowLength, $x, $y, $stackedZ, $packedItemList);
115	17	if ($stackedItem && $this->checkNonDimensionalConstraints($itemToTryStacking, $remainingWeightAllowed, $packedItemList)) {
116	11	$layer->insert(PackedItem::fromOrientatedItem($stackedItem, $x, $y, $stackedZ));
117	11	$remainingWeightAllowed -= $itemToTryStacking->getWeight();
118	11	$packedItemList->insert($packedItem);
119	11	$stackableDepth -= $stackedItem->getDepth();
120	11	$stackedZ += $stackedItem->getDepth();
121		} else {
122	13	$stackSkippedItems[] = $itemToTryStacking;
123		// abandon here if next item is the same, no point trying to keep going. Last time is not skipped, need that to trigger appropriate reset logic
124	13	while ($items->count() > 0 && static::isSameDimensions($itemToTryStacking, $items->top())) {
125	10	$stackSkippedItems[] = $items->extract();
126		}
127		}
128		}
129	56	if ($stackSkippedItems) {
130	13	$items = ItemList::fromArray(array_merge($stackSkippedItems, iterator_to_array($items)), true);
131		}
132	56	$x += $orientatedItem->getWidth();
133
134	56	$prevItem = $packedItem;
135	56	if ($items->count() === 0) {
136	53	$items = ItemList::fromArray(array_merge($skippedItems, iterator_to_array($items)), true);
137	56	$skippedItems = [];
138		}
139	50	} elseif (count($layer->getItems()) === 0) { // zero items on layer
140	39	$this->logger->debug("doesn't fit on layer even when empty, skipping for good");
141	39	continue;
142	49	} elseif ($items->count() > 0) { // skip for now, move on to the next item
143	41	$this->logger->debug("doesn't fit, skipping for now");
144	41	$skippedItems[] = $itemToPack;
145		// abandon here if next item is the same, no point trying to keep going. Last time is not skipped, need that to trigger appropriate reset logic
146	41	while ($items->count() > 2 && static::isSameDimensions($itemToPack, $items->top())) {
147	22	$skippedItems[] = $items->extract();
148		}
149	49	} elseif ($x > 0) {
150	49	$this->logger->debug('No more fit in width wise, resetting for new row');
151	49	$lengthLeft -= $rowLength;
152	49	$y += $rowLength;
153	49	$x = $rowLength = 0;
154	49	$skippedItems[] = $itemToPack;
155	49	$items = ItemList::fromArray(array_merge($skippedItems, iterator_to_array($items)), true);
156	49	$skippedItems = [];
157	49	$prevItem = null;
158	49	continue;
159		} else {
160	44	$this->logger->debug('no items fit, so starting next vertical layer');
161	44	$skippedItems[] = $itemToPack;
162
163	44	$items = ItemList::fromArray(array_merge($skippedItems, iterator_to_array($items)), true);
164
165	44	return $layer;
166		}
167		}
168
169	56	return $layer;
170		}
171
172		/**
173		* As well as purely dimensional constraints, there are other constraints that need to be met
174		* e.g. weight limits or item-specific restrictions (e.g. max <x> batteries per box).
175		*/
176	56	private function checkNonDimensionalConstraints(Item $itemToPack, int $remainingWeightAllowed, PackedItemList $packedItemList): bool
177		{
178	56	$customConstraintsOK = true;
179	56	if ($itemToPack instanceof ConstrainedItem) {
180	1	$customConstraintsOK = $itemToPack->canBePackedInBox($packedItemList, $this->box);
181		}
182
183	56	return $customConstraintsOK && $itemToPack->getWeight() <= $remainingWeightAllowed;
184		}
185
186	56	private function getRemainingWeightAllowed(array $layers): int
187		{
188	56	$remainingWeightAllowed = $this->box->getMaxWeight() - $this->box->getEmptyWeight();
189	56	foreach ($layers as $layer) {
190	44	$remainingWeightAllowed -= $layer->getWeight();
191		}
192
193	56	return $remainingWeightAllowed;
194		}
195
196		/**
197		* Compare two items to see if they have same dimensions.
198		*/
199	26	private static function isSameDimensions(Item $itemA, Item $itemB): bool
200		{
201	26	if ($itemA === $itemB) {
202	19	return true;
203		}
204	10	$itemADimensions = [$itemA->getWidth(), $itemA->getLength(), $itemA->getDepth()];
205	10	$itemBDimensions = [$itemB->getWidth(), $itemB->getLength(), $itemB->getDepth()];
206	10	sort($itemADimensions);
207	10	sort($itemBDimensions);
208
209	10	return $itemADimensions === $itemBDimensions;
210		}
211		}
212

dvdoug / BoxPacker

Push — master ( 34b8f8...cb2e0a )

LayerPacker::checkNonDimensionalConstraints() A

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