OrientatedItemSorter::exactFitDecider() - Code Metrics - Inspection of "Factor out some common code" - dvdoug/BoxPacker - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — analysis-z9DYDo ( e56742 )

by Doug

created 2020-04-19 19:15 UTC

OrientatedItemSorter::exactFitDecider() A

↳ Parent: OrientatedItemSorter

Complexity

Conditions	5
Paths	3

Size

Total Lines	11
Code Lines	5

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	6
CRAP Score	5

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	5
eloc	5
c	1
b	0
f	0
nc	3
nop	2
dl	0
loc	11
ccs	6
cts	6
cp	1
crap	5
rs	9.6111

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

namespace DVDoug\BoxPacker;

use Psr\Log\LoggerAwareInterface;
use Psr\Log\LoggerAwareTrait;

/**
 * Figure out best choice of orientations for an item and a given context.
 *
 * @author Doug Wright
 * @internal
 */
class OrientatedItemSorter implements LoggerAwareInterface
{
    use LoggerAwareTrait;

    /**
     * @var int[]
     */
    protected static $lookaheadCache = [];

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

    /**
     * @var bool
     */
    private $singlePassMode;

    /**
     * @var int
     */
    private $widthLeft;

    /**
     * @var int
     */
    private $lengthLeft;

    /**
     * @var int
     */
    private $depthLeft;

    /**
     * @var int
     */
    private $rowLength;

    /**
     * @var int
     */
    private $x;

    /**
     * @var int
     */
    private $y;

    /**
     * @var int
     */
    private $z;

    /**
     * @var ItemList
     */
    private $nextItems;

    /**
     * @var PackedItemList
     */
    private $prevPackedItemList;

    public function __construct(OrientatedItemFactory $factory, bool $singlePassMode, int $widthLeft, int $lengthLeft, int $depthLeft, ItemList $nextItems, int $rowLength, int $x, int $y, int $z, PackedItemList $prevPackedItemList)
    {
        $this->orientatedItemFactory = $factory;
        $this->singlePassMode = $singlePassMode;
        $this->widthLeft = $widthLeft;
        $this->lengthLeft = $lengthLeft;
        $this->depthLeft = $depthLeft;
        $this->nextItems = $nextItems;
        $this->rowLength = $rowLength;
        $this->x = $x;
        $this->y = $y;
        $this->z = $z;
        $this->prevPackedItemList = $prevPackedItemList;
    }

    public function __invoke(OrientatedItem $a, OrientatedItem $b)
    {
        //Prefer exact fits in width/length/depth order
        $orientationAWidthLeft = $this->widthLeft - $a->getWidth();
        $orientationBWidthLeft = $this->widthLeft - $b->getWidth();
        $widthDecider = $this->exactFitDecider($orientationAWidthLeft, $orientationBWidthLeft);
        if ($widthDecider !== 0) {
            return $widthDecider;
        }

        $orientationALengthLeft = $this->lengthLeft - $a->getLength();
        $orientationBLengthLeft = $this->lengthLeft - $b->getLength();
        $lengthDecider = $this->exactFitDecider($orientationALengthLeft, $orientationBLengthLeft);
        if ($lengthDecider !== 0) {
            return $lengthDecider;
        }

        $orientationADepthLeft = $this->depthLeft - $a->getDepth();
        $orientationBDepthLeft = $this->depthLeft - $b->getDepth();
        $depthDecider = $this->exactFitDecider($orientationADepthLeft, $orientationBDepthLeft);
        if ($depthDecider !== 0) {
            return $depthDecider;
        }

        // prefer leaving room for next item(s)
        $followingItemDecider = $this->lookAheadDecider($this->nextItems, $a, $b, $orientationAWidthLeft, $orientationBWidthLeft, $this->widthLeft, $this->lengthLeft, $this->depthLeft, $this->rowLength, $this->x, $this->y, $this->z, $this->prevPackedItemList);
        if ($followingItemDecider !== 0) {
            return $followingItemDecider;
        }

        // otherwise prefer leaving minimum possible gap, or the greatest footprint
        $orientationAMinGap = min($orientationAWidthLeft, $orientationALengthLeft);
        $orientationBMinGap = min($orientationBWidthLeft, $orientationBLengthLeft);

        return $orientationAMinGap <=> $orientationBMinGap ?: $a->getSurfaceFootprint() <=> $b->getSurfaceFootprint();
    }

    private function lookAheadDecider(ItemList $nextItems, OrientatedItem $a, OrientatedItem $b, int $orientationAWidthLeft, int $orientationBWidthLeft, int $widthLeft, int $lengthLeft, int $depthLeft, int $rowLength, int $x, int $y, int $z, PackedItemList $prevPackedItemList): int
    {
        if ($nextItems->count() === 0) {
            return 0;
        }

        $nextItemFitA = $this->orientatedItemFactory->getPossibleOrientations($nextItems->top(), $a, $orientationAWidthLeft, $lengthLeft, $depthLeft, $x, $y, $z, $prevPackedItemList);
        $nextItemFitB = $this->orientatedItemFactory->getPossibleOrientations($nextItems->top(), $b, $orientationBWidthLeft, $lengthLeft, $depthLeft, $x, $y, $z, $prevPackedItemList);
        if ($nextItemFitA && !$nextItemFitB) {
            return -1;
        }
        if ($nextItemFitB && !$nextItemFitA) {
            return 1;
        }

        // if not an easy either/or, do a partial lookahead
        $additionalPackedA = $this->calculateAdditionalItemsPackedWithThisOrientation($a, $nextItems, $widthLeft, $lengthLeft, $depthLeft, $rowLength);
        $additionalPackedB = $this->calculateAdditionalItemsPackedWithThisOrientation($b, $nextItems, $widthLeft, $lengthLeft, $depthLeft, $rowLength);

        return $additionalPackedB <=> $additionalPackedA ?: 0;
    }

    /**
     * Approximation of a forward-looking packing.
     *
     * Not an actual packing, that has additional logic regarding constraints and stackability, this focuses
     * purely on fit.
     */
    protected function calculateAdditionalItemsPackedWithThisOrientation(
        OrientatedItem $prevItem,
        ItemList $nextItems,
        int $originalWidthLeft,
        int $originalLengthLeft,
        int $depthLeft,
        int $currentRowLengthBeforePacking
    ): int {
        if ($this->singlePassMode) {
            return 0;
        }

        $currentRowLength = max($prevItem->getLength(), $currentRowLengthBeforePacking);

        $itemsToPack = $nextItems->topN(8); // cap lookahead as this gets recursive and slow

        $cacheKey = $originalWidthLeft .
            '|' .
            $originalLengthLeft .
            '|' .
            $prevItem->getWidth() .
            '|' .
            $prevItem->getLength() .
            '|' .
            $currentRowLength .
            '|'
            . $depthLeft;

        foreach ($itemsToPack as $itemToPack) {
            $cacheKey .= '|' .
                $itemToPack->getWidth() .
                '|' .
                $itemToPack->getLength() .
                '|' .
                $itemToPack->getDepth() .
                '|' .
                $itemToPack->getWeight() .
                '|' .
                ($itemToPack->getKeepFlat() ? '1' : '0');
        }

        if (!isset(static::$lookaheadCache[$cacheKey])) {
            $tempBox = new WorkingVolume($originalWidthLeft - $prevItem->getWidth(), $currentRowLength, $depthLeft, PHP_INT_MAX);
            $tempPacker = new VolumePacker($tempBox, $itemsToPack);
            $tempPacker->setSinglePassMode(true);
            $remainingRowPacked = $tempPacker->pack();

            foreach ($remainingRowPacked->getItems() as $packedItem) {
                $itemsToPack->remove($packedItem->getItem());
            }

            $tempBox = new WorkingVolume($originalWidthLeft, $originalLengthLeft - $currentRowLength, $depthLeft, PHP_INT_MAX);
            $tempPacker = new VolumePacker($tempBox, $itemsToPack);
            $tempPacker->setSinglePassMode(true);
            $nextRowsPacked = $tempPacker->pack();

            foreach ($nextRowsPacked->getItems() as $packedItem) {
                $itemsToPack->remove($packedItem->getItem());
            }

            $packedCount = $nextItems->count() - $itemsToPack->count();
            $this->logger->debug('Lookahead with orientation', ['packedCount' => $packedCount, 'orientatedItem' => $prevItem]);

            static::$lookaheadCache[$cacheKey] = $packedCount;
        }

        return static::$lookaheadCache[$cacheKey];
    }

    private function exactFitDecider(int $dimensionALeft, int $dimensionBLeft)
    {
        if ($dimensionALeft === 0 && $dimensionBLeft > 0) {
            return -1;
        }

        if ($dimensionALeft > 0 && $dimensionBLeft === 0) {
            return 1;
        }

        return 0;
    }
}


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 Psr\Log\LoggerAwareInterface;
12		use Psr\Log\LoggerAwareTrait;
13
14		/**
15		* Figure out best choice of orientations for an item and a given context.
16		*
17		* @author Doug Wright
18		* @internal
19		*/
20		class OrientatedItemSorter implements LoggerAwareInterface
21		{
22		use LoggerAwareTrait;
23
24		/**
25		* @var int[]
26		*/
27		protected static $lookaheadCache = [];
28
29		/**
30		* @var OrientatedItemFactory
31		*/
32		private $orientatedItemFactory;
33
34		/**
35		* @var bool
36		*/
37		private $singlePassMode;
38
39		/**
40		* @var int
41		*/
42		private $widthLeft;
43
44		/**
45		* @var int
46		*/
47		private $lengthLeft;
48
49		/**
50		* @var int
51		*/
52		private $depthLeft;
53
54		/**
55		* @var int
56		*/
57		private $rowLength;
58
59		/**
60		* @var int
61		*/
62		private $x;
63
64		/**
65		* @var int
66		*/
67		private $y;
68
69		/**
70		* @var int
71		*/
72		private $z;
73
74		/**
75		* @var ItemList
76		*/
77		private $nextItems;
78
79		/**
80		* @var PackedItemList
81		*/
82		private $prevPackedItemList;
83
84	57	public function __construct(OrientatedItemFactory $factory, bool $singlePassMode, int $widthLeft, int $lengthLeft, int $depthLeft, ItemList $nextItems, int $rowLength, int $x, int $y, int $z, PackedItemList $prevPackedItemList)
85		{
86	57	$this->orientatedItemFactory = $factory;
87	57	$this->singlePassMode = $singlePassMode;
88	57	$this->widthLeft = $widthLeft;
89	57	$this->lengthLeft = $lengthLeft;
90	57	$this->depthLeft = $depthLeft;
91	57	$this->nextItems = $nextItems;
92	57	$this->rowLength = $rowLength;
93	57	$this->x = $x;
94	57	$this->y = $y;
95	57	$this->z = $z;
96	57	$this->prevPackedItemList = $prevPackedItemList;
97	57	}
98
99	53	public function __invoke(OrientatedItem $a, OrientatedItem $b)
100		{
101		//Prefer exact fits in width/length/depth order
102	53	$orientationAWidthLeft = $this->widthLeft - $a->getWidth();
103	53	$orientationBWidthLeft = $this->widthLeft - $b->getWidth();
104	53	$widthDecider = $this->exactFitDecider($orientationAWidthLeft, $orientationBWidthLeft);
105	53	if ($widthDecider !== 0) {
106	10	return $widthDecider;
107		}
108
109	51	$orientationALengthLeft = $this->lengthLeft - $a->getLength();
110	51	$orientationBLengthLeft = $this->lengthLeft - $b->getLength();
111	51	$lengthDecider = $this->exactFitDecider($orientationALengthLeft, $orientationBLengthLeft);
112	51	if ($lengthDecider !== 0) {
113	20	return $lengthDecider;
114		}
115
116	51	$orientationADepthLeft = $this->depthLeft - $a->getDepth();
117	51	$orientationBDepthLeft = $this->depthLeft - $b->getDepth();
118	51	$depthDecider = $this->exactFitDecider($orientationADepthLeft, $orientationBDepthLeft);
119	51	if ($depthDecider !== 0) {
120	5	return $depthDecider;
121		}
122
123		// prefer leaving room for next item(s)
124	50	$followingItemDecider = $this->lookAheadDecider($this->nextItems, $a, $b, $orientationAWidthLeft, $orientationBWidthLeft, $this->widthLeft, $this->lengthLeft, $this->depthLeft, $this->rowLength, $this->x, $this->y, $this->z, $this->prevPackedItemList);
125	50	if ($followingItemDecider !== 0) {
126	19	return $followingItemDecider;
127		}
128
129		// otherwise prefer leaving minimum possible gap, or the greatest footprint
130	46	$orientationAMinGap = min($orientationAWidthLeft, $orientationALengthLeft);
131	46	$orientationBMinGap = min($orientationBWidthLeft, $orientationBLengthLeft);
132
133	46	return $orientationAMinGap <=> $orientationBMinGap ?: $a->getSurfaceFootprint() <=> $b->getSurfaceFootprint();
134		}
135
136	50	private function lookAheadDecider(ItemList $nextItems, OrientatedItem $a, OrientatedItem $b, int $orientationAWidthLeft, int $orientationBWidthLeft, int $widthLeft, int $lengthLeft, int $depthLeft, int $rowLength, int $x, int $y, int $z, PackedItemList $prevPackedItemList): int
137		{
138	50	if ($nextItems->count() === 0) {
139	32	return 0;
140		}
141
142	47	$nextItemFitA = $this->orientatedItemFactory->getPossibleOrientations($nextItems->top(), $a, $orientationAWidthLeft, $lengthLeft, $depthLeft, $x, $y, $z, $prevPackedItemList);
143	47	$nextItemFitB = $this->orientatedItemFactory->getPossibleOrientations($nextItems->top(), $b, $orientationBWidthLeft, $lengthLeft, $depthLeft, $x, $y, $z, $prevPackedItemList);
144	47	if ($nextItemFitA && !$nextItemFitB) {
145	10	return -1;
146		}
147	47	if ($nextItemFitB && !$nextItemFitA) {
148	13	return 1;
149		}
150
151		// if not an easy either/or, do a partial lookahead
152	45	$additionalPackedA = $this->calculateAdditionalItemsPackedWithThisOrientation($a, $nextItems, $widthLeft, $lengthLeft, $depthLeft, $rowLength);
153	45	$additionalPackedB = $this->calculateAdditionalItemsPackedWithThisOrientation($b, $nextItems, $widthLeft, $lengthLeft, $depthLeft, $rowLength);
154
155	45	return $additionalPackedB <=> $additionalPackedA ?: 0;
156		}
157
158		/**
159		* Approximation of a forward-looking packing.
160		*
161		* Not an actual packing, that has additional logic regarding constraints and stackability, this focuses
162		* purely on fit.
163		*/
164	45	protected function calculateAdditionalItemsPackedWithThisOrientation(
165		OrientatedItem $prevItem,
166		ItemList $nextItems,
167		int $originalWidthLeft,
168		int $originalLengthLeft,
169		int $depthLeft,
170		int $currentRowLengthBeforePacking
171		): int {
172	45	if ($this->singlePassMode) {
173	21	return 0;
174		}
175
176	45	$currentRowLength = max($prevItem->getLength(), $currentRowLengthBeforePacking);
177
178	45	$itemsToPack = $nextItems->topN(8); // cap lookahead as this gets recursive and slow
179
180		$cacheKey = $originalWidthLeft .
181	45	'\|' .
182	45	$originalLengthLeft .
183	45	'\|' .
184	45	$prevItem->getWidth() .
185	45	'\|' .
186	45	$prevItem->getLength() .
187	45	'\|' .
188	45	$currentRowLength .
189	45	'\|'
190	45	. $depthLeft;
191
192	45	foreach ($itemsToPack as $itemToPack) {
193		$cacheKey .= '\|' .
194	45	$itemToPack->getWidth() .
195	45	'\|' .
196	45	$itemToPack->getLength() .
197	45	'\|' .
198	45	$itemToPack->getDepth() .
199	45	'\|' .
200	45	$itemToPack->getWeight() .
201	45	'\|' .
202	45	($itemToPack->getKeepFlat() ? '1' : '0');
203		}
204
205	45	if (!isset(static::$lookaheadCache[$cacheKey])) {
206	42	$tempBox = new WorkingVolume($originalWidthLeft - $prevItem->getWidth(), $currentRowLength, $depthLeft, PHP_INT_MAX);
207	42	$tempPacker = new VolumePacker($tempBox, $itemsToPack);
208	42	$tempPacker->setSinglePassMode(true);
209	42	$remainingRowPacked = $tempPacker->pack();
210
211	42	foreach ($remainingRowPacked->getItems() as $packedItem) {
212	28	$itemsToPack->remove($packedItem->getItem());
213		}
214
215	42	$tempBox = new WorkingVolume($originalWidthLeft, $originalLengthLeft - $currentRowLength, $depthLeft, PHP_INT_MAX);
216	42	$tempPacker = new VolumePacker($tempBox, $itemsToPack);
217	42	$tempPacker->setSinglePassMode(true);
218	42	$nextRowsPacked = $tempPacker->pack();
219
220	42	foreach ($nextRowsPacked->getItems() as $packedItem) {
221	24	$itemsToPack->remove($packedItem->getItem());
222		}
223
224	42	$packedCount = $nextItems->count() - $itemsToPack->count();
225	42	$this->logger->debug('Lookahead with orientation', ['packedCount' => $packedCount, 'orientatedItem' => $prevItem]);
226
227	42	static::$lookaheadCache[$cacheKey] = $packedCount;
228		}
229
230	45	return static::$lookaheadCache[$cacheKey];
231		}
232
233	53	private function exactFitDecider(int $dimensionALeft, int $dimensionBLeft)
234		{
235	53	if ($dimensionALeft === 0 && $dimensionBLeft > 0) {
236	19	return -1;
237		}
238
239	51	if ($dimensionALeft > 0 && $dimensionBLeft === 0) {
240	18	return 1;
241		}
242
243	51	return 0;
244		}
245		}
246

dvdoug / BoxPacker

Push — analysis-z9DYDo ( e56742 )

OrientatedItemSorter::exactFitDecider() A

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