Packer::getMaxBoxesToBalanceWeight() - Code Metrics - Inspection of "Merge branch '3.x'" - dvdoug/BoxPacker - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( 11fd0d...57f32f )

by Doug

created 2021-01-01 17:52 UTC

Packer::getMaxBoxesToBalanceWeight() A

↳ Parent: Packer

Complexity

Conditions	1
Paths	1

Size

Total Lines	3
Code Lines	1

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	2
CRAP Score	1

Importance

Changes

Metric	Value
cc	1
eloc	1
nc	1
nop	0
dl	0
loc	3
ccs	2
cts	2
cp	1
crap	1
rs	10
c	0
b	0
f	0

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

namespace DVDoug\BoxPacker;

use function count;
use DVDoug\BoxPacker\Exception\ItemTooLargeException;
use DVDoug\BoxPacker\Exception\NoBoxesAvailableException;
use Psr\Log\LoggerAwareInterface;
use Psr\Log\LoggerAwareTrait;
use Psr\Log\LogLevel;
use Psr\Log\NullLogger;
use function usort;

/**
 * Actual packer.
 *
 * @author Doug Wright
 */
class Packer implements LoggerAwareInterface
{
    use LoggerAwareTrait;

    /**
     * Number of boxes at which balancing weight is deemed not worth it.
     *
     * @var int
     */
    protected $maxBoxesToBalanceWeight = 12;

    /**
     * List of items to be packed.
     *
     * @var ItemList
     */
    protected $items;

    /**
     * List of box sizes available to pack items into.
     *
     * @var BoxList
     */
    protected $boxes;

    /**
     * Quantities available of each box type.
     *
     * @var array<int, int>
     */
    protected $boxesQtyAvailable = [];

    /**
     * Constructor.
     */
    public function __construct()
    {
        $this->items = new ItemList();
        $this->boxes = new BoxList();

        $this->logger = new NullLogger();
    }

    /**
     * Add item to be packed.
     */
    public function addItem(Item $item, int $qty = 1): void
    {
        for ($i = 0; $i < $qty; ++$i) {
            $this->items->insert($item);
        }
        $this->logger->log(LogLevel::INFO, "added {$qty} x {$item->getDescription()}", ['item' => $item]);
    }

    /**
     * Set a list of items all at once.
     * @param iterable<Item>|ItemList $items
     */
    public function setItems(iterable $items): void
    {
        if ($items instanceof ItemList) {
            $this->items = clone $items;
        } else {
            $this->items = new ItemList();
            foreach ($items as $item) {
                $this->items->insert($item);
            }
        }
    }

    /**
     * Add box size.
     */
    public function addBox(Box $box): void
    {
        $this->boxes->insert($box);
        $this->setBoxQuantity($box, $box instanceof LimitedSupplyBox ? $box->getQuantityAvailable() : PHP_INT_MAX);
        $this->logger->log(LogLevel::INFO, "added box {$box->getReference()}", ['box' => $box]);
    }

    /**
     * Add a pre-prepared set of boxes all at once.
     */
    public function setBoxes(BoxList $boxList): void
    {
        $this->boxes = $boxList;
        foreach ($this->boxes as $box) {
            $this->setBoxQuantity($box, $box instanceof LimitedSupplyBox ? $box->getQuantityAvailable() : PHP_INT_MAX);
        }
    }

    /**
     * Set the quantity of this box type available.
     */
    public function setBoxQuantity(Box $box, int $qty): void
    {
        $this->boxesQtyAvailable[spl_object_id($box)] = $qty;
    }

    /**
     * Number of boxes at which balancing weight is deemed not worth the extra computation time.
     */
    public function getMaxBoxesToBalanceWeight(): int
    {
        return $this->maxBoxesToBalanceWeight;
    }

    /**
     * Number of boxes at which balancing weight is deemed not worth the extra computation time.
     */
    public function setMaxBoxesToBalanceWeight(int $maxBoxesToBalanceWeight): void
    {
        $this->maxBoxesToBalanceWeight = $maxBoxesToBalanceWeight;
    }

    /**
     * Pack items into boxes.
     */
    public function pack(): PackedBoxList
    {
        $this->sanityPrecheck();
        $packedBoxes = $this->doVolumePacking();

        //If we have multiple boxes, try and optimise/even-out weight distribution
        if ($packedBoxes->count() > 1 && $packedBoxes->count() <= $this->maxBoxesToBalanceWeight) {
            $redistributor = new WeightRedistributor($this->boxes, $this->boxesQtyAvailable);
            $redistributor->setLogger($this->logger);
            $packedBoxes = $redistributor->redistributeWeight($packedBoxes);
        }

        $this->logger->log(LogLevel::INFO, "[PACKING COMPLETED], {$packedBoxes->count()} boxes");

        return $packedBoxes;
    }

    /**
     * Pack items into boxes using the principle of largest volume item first.
     *
     * @throws NoBoxesAvailableException
     */
    public function doVolumePacking(bool $singlePassMode = false, bool $enforceSingleBox = false): PackedBoxList
    {
        $packedBoxes = new PackedBoxList();

        //Keep going until everything packed
        while ($this->items->count()) {
            $packedBoxesIteration = [];

            //Loop through boxes starting with smallest, see what happens
            foreach ($this->getBoxList($enforceSingleBox) as $box) {
                $volumePacker = new VolumePacker($box, $this->items);
                $volumePacker->setLogger($this->logger);
                $volumePacker->setSinglePassMode($singlePassMode);
                $packedBox = $volumePacker->pack();
                if ($packedBox->getItems()->count()) {
                    $packedBoxesIteration[] = $packedBox;

                    //Have we found a single box that contains everything?
                    if ($packedBox->getItems()->count() === $this->items->count()) {
                        break;
                    }
                }
            }

            try {
                //Find best box of iteration, and remove packed items from unpacked list
                $bestBox = $this->findBestBoxFromIteration($packedBoxesIteration);
            } catch (NoBoxesAvailableException $e) {
                if ($enforceSingleBox) {
                    return new PackedBoxList();
                }
                throw $e;
            }

            $this->items->removePackedItems($bestBox->getItems());

            $packedBoxes->insert($bestBox);
            --$this->boxesQtyAvailable[spl_object_id($bestBox->getBox())];
        }

        return $packedBoxes;
    }

    /**
     * Get a "smart" ordering of the boxes to try packing items into. The initial BoxList is already sorted in order
     * so that the smallest boxes are evaluated first, but this means that time is spent on boxes that cannot possibly
     * hold the entire set of items due to volume limitations. These should be evaluated first.
     *
     * @return iterable<Box>
     */
    protected function getBoxList(bool $enforceSingleBox = false): iterable
    {
        $itemVolume = 0;
        foreach ($this->items as $item) {
            $itemVolume += $item->getWidth() * $item->getLength() * $item->getDepth();
        }

        $preferredBoxes = [];
        $otherBoxes = [];
        foreach ($this->boxes as $box) {
            if ($this->boxesQtyAvailable[spl_object_id($box)] > 0) {
                if ($box->getInnerWidth() * $box->getInnerLength() * $box->getInnerDepth() >= $itemVolume) {
                    $preferredBoxes[] = $box;
                } elseif (!$enforceSingleBox) {
                    $otherBoxes[] = $box;
                }
            }
        }

        return array_merge($preferredBoxes, $otherBoxes);
    }

    /**
     * @param PackedBox[] $packedBoxes
     */
    protected function findBestBoxFromIteration(array $packedBoxes): PackedBox
    {
        if (count($packedBoxes) === 0) {
            throw new NoBoxesAvailableException("No boxes could be found for item '{$this->items->top()->getDescription()}'", $this->items->top());
        }

        usort($packedBoxes, [$this, 'compare']);

        return $packedBoxes[0];
    }

    private function sanityPrecheck(): void
    {
        /** @var Item $item */
        foreach ($this->items as $item) {
            $possibleFits = 0;

            /** @var Box $box */
            foreach ($this->boxes as $box) {
                if ($item->getWeight() <= ($box->getMaxWeight() - $box->getEmptyWeight())) {
                    $possibleFits += count((new OrientatedItemFactory($box))->getPossibleOrientationsInEmptyBox($item));
                }
            }

            if ($possibleFits === 0) {
                throw new ItemTooLargeException("Item '{$item->getDescription()}' is too large to fit into any box", $item);
            }
        }
    }

    private static function compare(PackedBox $boxA, PackedBox $boxB): int
    {
        $choice = $boxB->getItems()->count() <=> $boxA->getItems()->count();

        if ($choice === 0) {
            $choice = $boxB->getVolumeUtilisation() <=> $boxA->getVolumeUtilisation();
        }
        if ($choice === 0) {
            $choice = $boxB->getUsedVolume() <=> $boxA->getUsedVolume();
        }

        return $choice;
    }
}


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 DVDoug\BoxPacker\Exception\ItemTooLargeException;
13		use DVDoug\BoxPacker\Exception\NoBoxesAvailableException;
14		use Psr\Log\LoggerAwareInterface;
15		use Psr\Log\LoggerAwareTrait;
16		use Psr\Log\LogLevel;
17		use Psr\Log\NullLogger;
18		use function usort;
19
20		/**
21		* Actual packer.
22		*
23		* @author Doug Wright
24		*/
25		class Packer implements LoggerAwareInterface
26		{
27		use LoggerAwareTrait;
28
29		/**
30		* Number of boxes at which balancing weight is deemed not worth it.
31		*
32		* @var int
33		*/
34		protected $maxBoxesToBalanceWeight = 12;
35
36		/**
37		* List of items to be packed.
38		*
39		* @var ItemList
40		*/
41		protected $items;
42
43		/**
44		* List of box sizes available to pack items into.
45		*
46		* @var BoxList
47		*/
48		protected $boxes;
49
50		/**
51		* Quantities available of each box type.
52		*
53		* @var array<int, int>
54		*/
55		protected $boxesQtyAvailable = [];
56
57		/**
58		* Constructor.
59		*/
60	42	public function __construct()
61		{
62	42	$this->items = new ItemList();
63	42	$this->boxes = new BoxList();
64
65	42	$this->logger = new NullLogger();
66	42	}
67
68		/**
69		* Add item to be packed.
70		*/
71	40	public function addItem(Item $item, int $qty = 1): void
72		{
73	40	for ($i = 0; $i < $qty; ++$i) {
74	40	$this->items->insert($item);
75		}
76	40	$this->logger->log(LogLevel::INFO, "added {$qty} x {$item->getDescription()}", ['item' => $item]);
77	40	}
78
79		/**
80		* Set a list of items all at once.
81		* @param iterable<Item>\|ItemList $items
82		*/
83	6	public function setItems(iterable $items): void
84		{
85	6	if ($items instanceof ItemList) {
86		$this->items = clone $items;
87		} else {
88	6	$this->items = new ItemList();
89	6	foreach ($items as $item) {
90	6	$this->items->insert($item);
91		}
92		}
93	6	}
94
95		/**
96		* Add box size.
97		*/
98	38	public function addBox(Box $box): void
99		{
100	38	$this->boxes->insert($box);
101	38	$this->setBoxQuantity($box, $box instanceof LimitedSupplyBox ? $box->getQuantityAvailable() : PHP_INT_MAX);
102	38	$this->logger->log(LogLevel::INFO, "added box {$box->getReference()}", ['box' => $box]);
103	38	}
104
105		/**
106		* Add a pre-prepared set of boxes all at once.
107		*/
108	6	public function setBoxes(BoxList $boxList): void
109		{
110	6	$this->boxes = $boxList;
111	6	foreach ($this->boxes as $box) {
112	6	$this->setBoxQuantity($box, $box instanceof LimitedSupplyBox ? $box->getQuantityAvailable() : PHP_INT_MAX);
113		}
114	6	}
115
116		/**
117		* Set the quantity of this box type available.
118		*/
119	38	public function setBoxQuantity(Box $box, int $qty): void
120		{
121	38	$this->boxesQtyAvailable[spl_object_id($box)] = $qty;
122	38	}
123
124		/**
125		* Number of boxes at which balancing weight is deemed not worth the extra computation time.
126		*/
127	2	public function getMaxBoxesToBalanceWeight(): int
128		{
129	2	return $this->maxBoxesToBalanceWeight;
130		}
131
132		/**
133		* Number of boxes at which balancing weight is deemed not worth the extra computation time.
134		*/
135	4	public function setMaxBoxesToBalanceWeight(int $maxBoxesToBalanceWeight): void
136		{
137	4	$this->maxBoxesToBalanceWeight = $maxBoxesToBalanceWeight;
138	4	}
139
140		/**
141		* Pack items into boxes.
142		*/
143	40	public function pack(): PackedBoxList
144		{
145	40	$this->sanityPrecheck();
146	36	$packedBoxes = $this->doVolumePacking();
147
148		//If we have multiple boxes, try and optimise/even-out weight distribution
149	34	if ($packedBoxes->count() > 1 && $packedBoxes->count() <= $this->maxBoxesToBalanceWeight) {
150	14	$redistributor = new WeightRedistributor($this->boxes, $this->boxesQtyAvailable);
151	14	$redistributor->setLogger($this->logger);
152	14	$packedBoxes = $redistributor->redistributeWeight($packedBoxes);
153		}
154
155	34	$this->logger->log(LogLevel::INFO, "[PACKING COMPLETED], {$packedBoxes->count()} boxes");
156
157	34	return $packedBoxes;
158		}
159
160		/**
161		* Pack items into boxes using the principle of largest volume item first.
162		*
163		* @throws NoBoxesAvailableException
164		*/
165	36	public function doVolumePacking(bool $singlePassMode = false, bool $enforceSingleBox = false): PackedBoxList
166		{
167	36	$packedBoxes = new PackedBoxList();
168
169		//Keep going until everything packed
170	36	while ($this->items->count()) {
171	36	$packedBoxesIteration = [];
172
173		//Loop through boxes starting with smallest, see what happens
174	36	foreach ($this->getBoxList($enforceSingleBox) as $box) {
175	36	$volumePacker = new VolumePacker($box, $this->items);
176	36	$volumePacker->setLogger($this->logger);
177	36	$volumePacker->setSinglePassMode($singlePassMode);
178	36	$packedBox = $volumePacker->pack();
179	36	if ($packedBox->getItems()->count()) {
180	36	$packedBoxesIteration[] = $packedBox;
181
182		//Have we found a single box that contains everything?
183	36	if ($packedBox->getItems()->count() === $this->items->count()) {
184	34	break;
185		}
186		}
187		}
188
189		try {
190		//Find best box of iteration, and remove packed items from unpacked list
191	36	$bestBox = $this->findBestBoxFromIteration($packedBoxesIteration);
192	4	} catch (NoBoxesAvailableException $e) {
193	4	if ($enforceSingleBox) {
194	2	return new PackedBoxList();
195		}
196	2	throw $e;
197		}
198
199	36	$this->items->removePackedItems($bestBox->getItems());
200
201	36	$packedBoxes->insert($bestBox);
202	36	--$this->boxesQtyAvailable[spl_object_id($bestBox->getBox())];
203		}
204
205	34	return $packedBoxes;
206		}
207
208		/**
209		* Get a "smart" ordering of the boxes to try packing items into. The initial BoxList is already sorted in order
210		* so that the smallest boxes are evaluated first, but this means that time is spent on boxes that cannot possibly
211		* hold the entire set of items due to volume limitations. These should be evaluated first.
212		*
213		* @return iterable<Box>
214		*/
215	36	protected function getBoxList(bool $enforceSingleBox = false): iterable
216		{
217	36	$itemVolume = 0;
218	36	foreach ($this->items as $item) {
219	36	$itemVolume += $item->getWidth() * $item->getLength() * $item->getDepth();
220		}
221
222	36	$preferredBoxes = [];
223	36	$otherBoxes = [];
224	36	foreach ($this->boxes as $box) {
225	36	if ($this->boxesQtyAvailable[spl_object_id($box)] > 0) {
226	36	if ($box->getInnerWidth() * $box->getInnerLength() * $box->getInnerDepth() >= $itemVolume) {
227	34	$preferredBoxes[] = $box;
228	12	} elseif (!$enforceSingleBox) {
229	12	$otherBoxes[] = $box;
230		}
231		}
232		}
233
234	36	return array_merge($preferredBoxes, $otherBoxes);
235		}
236
237		/**
238		* @param PackedBox[] $packedBoxes
239		*/
240	36	protected function findBestBoxFromIteration(array $packedBoxes): PackedBox
241		{
242	36	if (count($packedBoxes) === 0) {
243	4	throw new NoBoxesAvailableException("No boxes could be found for item '{$this->items->top()->getDescription()}'", $this->items->top());
244		}
245
246	36	usort($packedBoxes, [$this, 'compare']);
247
248	36	return $packedBoxes[0];
249		}
250
251	40	private function sanityPrecheck(): void
252		{
253		/** @var Item $item */
254	40	foreach ($this->items as $item) {
255	40	$possibleFits = 0;
256
257		/** @var Box $box */
258	40	foreach ($this->boxes as $box) {
259	38	if ($item->getWeight() <= ($box->getMaxWeight() - $box->getEmptyWeight())) {
260	38	$possibleFits += count((new OrientatedItemFactory($box))->getPossibleOrientationsInEmptyBox($item));
261		}
262		}
263
264	40	if ($possibleFits === 0) {
265	6	throw new ItemTooLargeException("Item '{$item->getDescription()}' is too large to fit into any box", $item);
266		}
267		}
268	36	}
269
270	6	private static function compare(PackedBox $boxA, PackedBox $boxB): int
271		{
272	6	$choice = $boxB->getItems()->count() <=> $boxA->getItems()->count();
273
274	6	if ($choice === 0) {
275	6	$choice = $boxB->getVolumeUtilisation() <=> $boxA->getVolumeUtilisation();
276		}
277	6	if ($choice === 0) {
278	6	$choice = $boxB->getUsedVolume() <=> $boxA->getUsedVolume();
279		}
280
281	6	return $choice;
282		}
283		}
284

dvdoug / BoxPacker

Push — master ( 11fd0d...57f32f )

Packer::getMaxBoxesToBalanceWeight() A

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