LayerPacker::__construct() - Code Metrics - Inspection of "Split out layer packing code into it's own class" - dvdoug/BoxPacker - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — refactor_layerpacker ( dfc43c )

by Doug

created 2020-04-11 23:45 UTC

LayerPacker::__construct() A

↳ Parent: LayerPacker

Complexity

Conditions	1
Paths	1

Size

Total Lines	8
Code Lines	4

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	5
CRAP Score	1

Importance

Changes	1
Bugs	0	Features	0

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

    /**
     * @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);
    }

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

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

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

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

            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, $singlePassMode);
                    if ($stackedItem && $this->checkNonDimensionalConstraints($itemToTryStacking, $layers, $remainingWeightAllowed)) {
                        $layer->insert(PackedItem::fromOrientatedItem($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, array $layers, int $remainingWeightAllowed): bool
    {
        $customConstraintsOK = true;
        if ($itemToPack instanceof ConstrainedItem) {
            $customConstraintsOK = $itemToPack->canBePackedInBox($this->getPackedItemList($layers), $this->box);
        }

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

    /**
     * Generate a single list of items packed.
     */
    private function getPackedItemList(array $layers): PackedItemList
    {
        $packedItemList = new PackedItemList();
        foreach ($layers as $layer) {
            foreach ($layer->getItems() as $packedItem) {
                $packedItemList->insert($packedItem);
            }
        }

        return $packedItemList;
    }

    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		* @var OrientatedItemFactory
41		*/
42		private $orientatedItemFactory;
43
44		/**
45		* Constructor.
46		*/
47	56	public function __construct(Box $box)
48		{
49	56	$this->box = $box;
50
51	56	$this->logger = new NullLogger();
52
53	56	$this->orientatedItemFactory = new OrientatedItemFactory($this->box);
54	56	$this->orientatedItemFactory->setLogger($this->logger);
55	56	}
56
57		/**
58		* Sets a logger.
59		*/
60	56	public function setLogger(LoggerInterface $logger): void
61		{
62	56	$this->logger = $logger;
63	56	$this->orientatedItemFactory->setLogger($logger);
64	56	}
65
66		/**
67		* Pack items into an individual vertical layer.
68		*/
69	56	public function packLayer(ItemList &$items, array $layers, int $z, int $layerWidth, int $lengthLeft, int $depthLeft, int $guidelineLayerDepth, bool $singlePassMode): PackedLayer
70		{
71	56	$layers[] = $layer = new PackedLayer();
72	56	$prevItem = null;
73	56	$x = $y = $rowLength = 0;
74	56	$skippedItems = [];
75	56	$remainingWeightAllowed = $this->getRemainingWeightAllowed($layers);
76	56	$packedItemList = $this->getPackedItemList($layers);
77
78	56	while ($items->count() > 0) {
79	56	$itemToPack = $items->extract();
80
81		//skip items that are simply too heavy or too large
82	56	if (!$this->checkNonDimensionalConstraints($itemToPack, $layers, $remainingWeightAllowed)) {
83	7	continue;
84		}
85
86	56	$orientatedItem = $this->orientatedItemFactory->getBestOrientation($itemToPack, $prevItem instanceof PackedItem ? $prevItem->toOrientatedItem() : null, $items, $layerWidth - $x, $lengthLeft, $depthLeft, $rowLength, $x, $y, $z, $packedItemList, $singlePassMode);
87
88	56	if ($orientatedItem instanceof OrientatedItem) {
89	56	$packedItem = PackedItem::fromOrientatedItem($orientatedItem, $x, $y, $z);
90	56	$layer->insert($packedItem);
91	56	$remainingWeightAllowed -= $itemToPack->getWeight();
92	56	$packedItemList->insert($packedItem);
93
94	56	$rowLength = max($rowLength, $orientatedItem->getLength());
95
96		//Figure out if we can stack the next item vertically on top of this rather than side by side
97		//e.g. when we've packed a tall item, and have just put a shorter one next to it.
98	56	$stackableDepth = ($guidelineLayerDepth ?: $layer->getDepth()) - $orientatedItem->getDepth();
99	56	$stackedZ = $z + $orientatedItem->getDepth();
100	56	$stackSkippedItems = [];
101	56	while ($stackableDepth > 0 && $items->count() > 0) {
102	17	$itemToTryStacking = $items->extract();
103	17	$stackedItem = $this->orientatedItemFactory->getBestOrientation($itemToTryStacking, $prevItem instanceof PackedItem ? $prevItem->toOrientatedItem() : null, $items, $orientatedItem->getWidth(), $orientatedItem->getLength(), $stackableDepth, $rowLength, $x, $y, $stackedZ, $packedItemList, $singlePassMode);
104	17	if ($stackedItem && $this->checkNonDimensionalConstraints($itemToTryStacking, $layers, $remainingWeightAllowed)) {
105	11	$layer->insert(PackedItem::fromOrientatedItem($stackedItem, $x, $y, $stackedZ));
106	11	$remainingWeightAllowed -= $itemToTryStacking->getWeight();
107	11	$packedItemList->insert($packedItem);
108	11	$stackableDepth -= $stackedItem->getDepth();
109	11	$stackedZ += $stackedItem->getDepth();
110		} else {
111	13	$stackSkippedItems[] = $itemToTryStacking;
112		// abandon here if next item is the same, no point trying to keep going. Last time is not skipped, need that to trigger appropriate reset logic
113	13	while ($items->count() > 0 && static::isSameDimensions($itemToTryStacking, $items->top())) {
114	10	$stackSkippedItems[] = $items->extract();
115		}
116		}
117		}
118	56	if ($stackSkippedItems) {
119	13	$items = ItemList::fromArray(array_merge($stackSkippedItems, iterator_to_array($items)), true);
120		}
121	56	$x += $orientatedItem->getWidth();
122
123	56	$prevItem = $packedItem;
124	56	if ($items->count() === 0) {
125	53	$items = ItemList::fromArray(array_merge($skippedItems, iterator_to_array($items)), true);
126	56	$skippedItems = [];
127		}
128	50	} elseif (count($layer->getItems()) === 0) { // zero items on layer
129	35	$this->logger->debug("doesn't fit on layer even when empty, skipping for good");
130	35	continue;
131	49	} elseif ($items->count() > 0) { // skip for now, move on to the next item
132	41	$this->logger->debug("doesn't fit, skipping for now");
133	41	$skippedItems[] = $itemToPack;
134		// abandon here if next item is the same, no point trying to keep going. Last time is not skipped, need that to trigger appropriate reset logic
135	41	while ($items->count() > 2 && static::isSameDimensions($itemToPack, $items->top())) {
136	22	$skippedItems[] = $items->extract();
137		}
138	49	} elseif ($x > 0) {
139	49	$this->logger->debug('No more fit in width wise, resetting for new row');
140	49	$lengthLeft -= $rowLength;
141	49	$y += $rowLength;
142	49	$x = $rowLength = 0;
143	49	$skippedItems[] = $itemToPack;
144	49	$items = ItemList::fromArray(array_merge($skippedItems, iterator_to_array($items)), true);
145	49	$skippedItems = [];
146	49	$prevItem = null;
147	49	continue;
148		} else {
149	43	$this->logger->debug('no items fit, so starting next vertical layer');
150	43	$skippedItems[] = $itemToPack;
151
152	43	$items = ItemList::fromArray(array_merge($skippedItems, iterator_to_array($items)), true);
153
154	43	return $layer;
155		}
156		}
157
158	56	return $layer;
159		}
160
161		/**
162		* As well as purely dimensional constraints, there are other constraints that need to be met
163		* e.g. weight limits or item-specific restrictions (e.g. max <x> batteries per box).
164		*/
165	56	private function checkNonDimensionalConstraints(Item $itemToPack, array $layers, int $remainingWeightAllowed): bool
166		{
167	56	$customConstraintsOK = true;
168	56	if ($itemToPack instanceof ConstrainedItem) {
169	1	$customConstraintsOK = $itemToPack->canBePackedInBox($this->getPackedItemList($layers), $this->box);
170		}
171
172	56	return $customConstraintsOK && $itemToPack->getWeight() <= $remainingWeightAllowed;
173		}
174
175		/**
176		* Generate a single list of items packed.
177		*/
178	56	private function getPackedItemList(array $layers): PackedItemList
179		{
180	56	$packedItemList = new PackedItemList();
181	56	foreach ($layers as $layer) {
182	56	foreach ($layer->getItems() as $packedItem) {
183	44	$packedItemList->insert($packedItem);
184		}
185		}
186
187	56	return $packedItemList;
188		}
189
190	56	private function getRemainingWeightAllowed(array $layers): int
191		{
192	56	$remainingWeightAllowed = $this->box->getMaxWeight() - $this->box->getEmptyWeight();
193	56	foreach ($layers as $layer) {
194	56	$remainingWeightAllowed -= $layer->getWeight();
195		}
196
197	56	return $remainingWeightAllowed;
198		}
199
200		/**
201		* Compare two items to see if they have same dimensions.
202		*/
203	26	private static function isSameDimensions(Item $itemA, Item $itemB): bool
204		{
205	26	if ($itemA === $itemB) {
206	19	return true;
207		}
208	10	$itemADimensions = [$itemA->getWidth(), $itemA->getLength(), $itemA->getDepth()];
209	10	$itemBDimensions = [$itemB->getWidth(), $itemB->getLength(), $itemB->getDepth()];
210	10	sort($itemADimensions);
211	10	sort($itemBDimensions);
212
213	10	return $itemADimensions === $itemBDimensions;
214		}
215		}
216

dvdoug / BoxPacker

Push — refactor_layerpacker ( dfc43c )

LayerPacker::__construct() A

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