LayerPacker::checkNonDimensionalConstraints() - Code Metrics - Inspection of "Backport 3.x" - dvdoug/BoxPacker - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Push — 2.x-dev ( eccc16...ab1c97 )

by Doug

created 2020-04-23 22:39 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
 */
namespace DVDoug\BoxPacker;

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)
    {
        $this->logger = $logger;
        $this->orientatedItemFactory->setLogger($logger);
    }

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

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

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

            //skip items that will never fit e.g. too heavy
            if (!$this->checkNonDimensionalConstraints($itemToPack, $remainingWeightAllowed, $packedItemList)) {
                continue;
            }

            $orientatedItem = $this->orientatedItemFactory->getBestOrientation($itemToPack, $prevItem, $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, $packedItem->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.
                $this->packVerticallyInsideItemFootprint($layer, $packedItem, $packedItemList, $items, $remainingWeightAllowed, $guidelineLayerDepth, $rowLength, $x, $y, $z);
                $x += $packedItem->getWidth();

                $prevItem = $orientatedItem;
                if ($items->count() === 0) {
                    $items = ItemList::fromArray(array_merge($skippedItems, iterator_to_array($items)));
                    $skippedItems = [];
                }
                continue;
            }

            if ($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() > 1 && static::isSameDimensions($itemToPack, $items->top())) {
                    $skippedItems[] = $items->extract();
                }
                continue;
            }

            if ($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)));
                $skippedItems = [];
                $prevItem = null;
                continue;
            }

            $this->logger->debug('no items fit, so starting next vertical layer');
            $skippedItems[] = $itemToPack;

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

            return $layer;
        }

        return $layer;
    }

    private function packVerticallyInsideItemFootprint(PackedLayer $layer, PackedItem $packedItem, PackedItemList $packedItemList, ItemList &$items, &$remainingWeightAllowed, $guidelineLayerDepth, $rowLength, $x, $y, $z)
    {
        $stackableDepth = ($guidelineLayerDepth ?: $layer->getDepth()) - $packedItem->getDepth();
        $stackedZ = $z + $packedItem->getDepth();
        $stackSkippedItems = [];
        $stackedItem = $packedItem->toOrientatedItem();
        while ($stackableDepth > 0 && $items->count() > 0) {
            $itemToTryStacking = $items->extract();

            //skip items that will never fit
            if (!$this->checkNonDimensionalConstraints($itemToTryStacking, $remainingWeightAllowed, $packedItemList)) {
                continue;
            }

            $stackedItem = $this->orientatedItemFactory->getBestOrientation($itemToTryStacking, $stackedItem, $items, $packedItem->getWidth(), $packedItem->getLength(), $stackableDepth, $rowLength, $x, $y, $stackedZ, $packedItemList);
            if ($stackedItem) {
                $layer->insert(PackedItem::fromOrientatedItem($stackedItem, $x, $y, $stackedZ));
                $remainingWeightAllowed -= $itemToTryStacking->getWeight();
                $packedItemList->insert($packedItem);
                $stackableDepth -= $stackedItem->getDepth();
                $stackedZ += $stackedItem->getDepth();
                continue;
            }

            $stackSkippedItems[] = $itemToTryStacking;
            // abandon here if next item is the same, no point trying to keep going
            while ($items->count() > 0 && static::isSameDimensions($itemToTryStacking, $items->top())) {
                $stackSkippedItems[] = $items->extract();
            }
        }
        $items = ItemList::fromArray(array_merge($stackSkippedItems, iterator_to_array($items)));
    }

    /**
     * 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, $remainingWeightAllowed, PackedItemList $packedItemList)
    {
        $customConstraintsOK = true;
        if ($itemToPack instanceof ConstrainedItem) {
            $customConstraintsOK = $itemToPack->canBePackedInBox($packedItemList->asItemList(), $this->box);
        }

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

    private function getRemainingWeightAllowed(array $layers)
    {
        $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 $itemB)
    {
        if ($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		namespace DVDoug\BoxPacker;
8
9		use Psr\Log\LoggerAwareInterface;
10		use Psr\Log\LoggerInterface;
11		use Psr\Log\NullLogger;
12
13		/**
14		* Layer packer.
15		*
16		* @internal
17		* @author Doug Wright
18		*/
19		class LayerPacker implements LoggerAwareInterface
20		{
21		/**
22		* The logger instance.
23		*
24		* @var LoggerInterface
25		*/
26		private $logger;
27
28		/**
29		* Box to pack items into.
30		*
31		* @var Box
32		*/
33		private $box;
34
35		/**
36		* Whether the packer is in single-pass mode.
37		*
38		* @var bool
39		*/
40		private $singlePassMode = false;
41
42		/**
43		* @var OrientatedItemFactory
44		*/
45		private $orientatedItemFactory;
46
47		/**
48		* Constructor.
49		*/
50	51	public function __construct(Box $box)
51		{
52	51	$this->box = $box;
53	51	$this->logger = new NullLogger();
54
55	51	$this->orientatedItemFactory = new OrientatedItemFactory($this->box);
56	51	$this->orientatedItemFactory->setLogger($this->logger);
57	51	}
58
59		/**
60		* Sets a logger.
61		*/
62	51	public function setLogger(LoggerInterface $logger)
63		{
64	51	$this->logger = $logger;
65	51	$this->orientatedItemFactory->setLogger($logger);
66	51	}
67
68	46	public function setSinglePassMode($singlePassMode)
69		{
70	46	$this->singlePassMode = $singlePassMode;
71	46	$this->orientatedItemFactory->setSinglePassMode($singlePassMode);
72	46	}
73
74		/**
75		* Pack items into an individual vertical layer.
76		*/
77	51	public function packLayer(ItemList &$items, PackedItemList $packedItemList, array $layers, $z, $layerWidth, $lengthLeft, $depthLeft, $guidelineLayerDepth)
78		{
79	51	$layer = new PackedLayer();
80	51	$prevItem = null;
81	51	$x = $y = $rowLength = 0;
82	51	$skippedItems = [];
83	51	$remainingWeightAllowed = $this->getRemainingWeightAllowed($layers);
84
85	51	while ($items->count() > 0) {
86	51	$itemToPack = $items->extract();
87
88		//skip items that will never fit e.g. too heavy
89	51	if (!$this->checkNonDimensionalConstraints($itemToPack, $remainingWeightAllowed, $packedItemList)) {
90	5	continue;
91		}
92
93	51	$orientatedItem = $this->orientatedItemFactory->getBestOrientation($itemToPack, $prevItem, $items, $layerWidth - $x, $lengthLeft, $depthLeft, $rowLength, $x, $y, $z, $packedItemList);
94
95	51	if ($orientatedItem instanceof OrientatedItem) {
96	51	$packedItem = PackedItem::fromOrientatedItem($orientatedItem, $x, $y, $z);
97	51	$layer->insert($packedItem);
98	51	$remainingWeightAllowed -= $itemToPack->getWeight();
99	51	$packedItemList->insert($packedItem);
100
101	51	$rowLength = max($rowLength, $packedItem->getLength());
102
103		//Figure out if we can stack the next item vertically on top of this rather than side by side
104		//e.g. when we've packed a tall item, and have just put a shorter one next to it.
105	51	$this->packVerticallyInsideItemFootprint($layer, $packedItem, $packedItemList, $items, $remainingWeightAllowed, $guidelineLayerDepth, $rowLength, $x, $y, $z);
106	51	$x += $packedItem->getWidth();
107
108	51	$prevItem = $orientatedItem;
109	51	if ($items->count() === 0) {
110	49	$items = ItemList::fromArray(array_merge($skippedItems, iterator_to_array($items)));
111	49	$skippedItems = [];
112		}
113	51	continue;
114		}
115
116	46	if ($items->count() > 0) { // skip for now, move on to the next item
117	38	$this->logger->debug("doesn't fit, skipping for now");
118	38	$skippedItems[] = $itemToPack;
119		// abandon here if next item is the same, no point trying to keep going. Last time is not skipped, need that to trigger appropriate reset logic
120	38	while ($items->count() > 1 && static::isSameDimensions($itemToPack, $items->top())) {
121	22	$skippedItems[] = $items->extract();
122		}
123	38	continue;
124		}
125
126	46	if ($x > 0) {
127	45	$this->logger->debug('No more fit in width wise, resetting for new row');
128	45	$lengthLeft -= $rowLength;
129	45	$y += $rowLength;
130	45	$x = $rowLength = 0;
131	45	$skippedItems[] = $itemToPack;
132	45	$items = ItemList::fromArray(array_merge($skippedItems, iterator_to_array($items)));
133	45	$skippedItems = [];
134	45	$prevItem = null;
135	45	continue;
136		}
137
138	41	$this->logger->debug('no items fit, so starting next vertical layer');
139	41	$skippedItems[] = $itemToPack;
140
141	41	$items = ItemList::fromArray(array_merge($skippedItems, iterator_to_array($items)));
142
143	41	return $layer;
144		}
145
146	50	return $layer;
147		}
148
149	51	private function packVerticallyInsideItemFootprint(PackedLayer $layer, PackedItem $packedItem, PackedItemList $packedItemList, ItemList &$items, &$remainingWeightAllowed, $guidelineLayerDepth, $rowLength, $x, $y, $z)
150		{
151	51	$stackableDepth = ($guidelineLayerDepth ?: $layer->getDepth()) - $packedItem->getDepth();
152	51	$stackedZ = $z + $packedItem->getDepth();
153	51	$stackSkippedItems = [];
154	51	$stackedItem = $packedItem->toOrientatedItem();
155	51	while ($stackableDepth > 0 && $items->count() > 0) {
156	17	$itemToTryStacking = $items->extract();
157
158		//skip items that will never fit
159	17	if (!$this->checkNonDimensionalConstraints($itemToTryStacking, $remainingWeightAllowed, $packedItemList)) {
160	1	continue;
161		}
162
163	17	$stackedItem = $this->orientatedItemFactory->getBestOrientation($itemToTryStacking, $stackedItem, $items, $packedItem->getWidth(), $packedItem->getLength(), $stackableDepth, $rowLength, $x, $y, $stackedZ, $packedItemList);
164	17	if ($stackedItem) {
165	11	$layer->insert(PackedItem::fromOrientatedItem($stackedItem, $x, $y, $stackedZ));
166	11	$remainingWeightAllowed -= $itemToTryStacking->getWeight();
167	11	$packedItemList->insert($packedItem);
168	11	$stackableDepth -= $stackedItem->getDepth();
169	11	$stackedZ += $stackedItem->getDepth();
170	11	continue;
171		}
172
173	13	$stackSkippedItems[] = $itemToTryStacking;
174		// abandon here if next item is the same, no point trying to keep going
175	13	while ($items->count() > 0 && static::isSameDimensions($itemToTryStacking, $items->top())) {
176	10	$stackSkippedItems[] = $items->extract();
177		}
178		}
179	51	$items = ItemList::fromArray(array_merge($stackSkippedItems, iterator_to_array($items)));
180	51	}
181
182		/**
183		* As well as purely dimensional constraints, there are other constraints that need to be met
184		* e.g. weight limits or item-specific restrictions (e.g. max <x> batteries per box).
185		*/
186	51	private function checkNonDimensionalConstraints(Item $itemToPack, $remainingWeightAllowed, PackedItemList $packedItemList)
187		{
188	51	$customConstraintsOK = true;
189	51	if ($itemToPack instanceof ConstrainedItem) {
190	1	$customConstraintsOK = $itemToPack->canBePackedInBox($packedItemList->asItemList(), $this->box);
191		}
192
193	51	return $customConstraintsOK && $itemToPack->getWeight() <= $remainingWeightAllowed;
194		}
195
196	51	private function getRemainingWeightAllowed(array $layers)
197		{
198	51	$remainingWeightAllowed = $this->box->getMaxWeight() - $this->box->getEmptyWeight();
199	51	foreach ($layers as $layer) {
200	40	$remainingWeightAllowed -= $layer->getWeight();
201		}
202
203	51	return $remainingWeightAllowed;
204		}
205
206		/**
207		* Compare two items to see if they have same dimensions.
208		*/
209	29	private static function isSameDimensions(Item $itemA, Item $itemB)
210		{
211	29	if ($itemA === $itemB) {
212	20	return true;
213		}
214	13	$itemADimensions = [$itemA->getWidth(), $itemA->getLength(), $itemA->getDepth()];
215	13	$itemBDimensions = [$itemB->getWidth(), $itemB->getLength(), $itemB->getDepth()];
216	13	sort($itemADimensions);
217	13	sort($itemBDimensions);
218
219	13	return $itemADimensions === $itemBDimensions;
220		}
221		}
222

dvdoug / BoxPacker

Push — 2.x-dev ( eccc16...ab1c97 )

LayerPacker::checkNonDimensionalConstraints() A

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