OrientatedItemFactory::generatePermutations() - Code Metrics - Inspection of "Move box qty check into getBoxList()" - dvdoug/BoxPacker - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( e56742...2ecca9 )

by Doug

created 2020-04-20 21:06 UTC

OrientatedItemFactory::generatePermutations() A

↳ Parent: OrientatedItemFactory

Complexity

Conditions	4
Paths	3

Size

Total Lines	22
Code Lines	12

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	12
CRAP Score	4

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	4
eloc	12
c	1
b	0
f	0
nc	3
nop	2
dl	0
loc	22
ccs	12
cts	12
cp	1
crap	4
rs	9.8666

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

namespace DVDoug\BoxPacker;

use function array_filter;
use function count;
use Psr\Log\LoggerAwareInterface;
use Psr\Log\LoggerAwareTrait;
use Psr\Log\NullLogger;
use function usort;

/**
 * Figure out orientations for an item and a given set of dimensions.
 *
 * @author Doug Wright
 * @internal
 */
class OrientatedItemFactory implements LoggerAwareInterface
{
    use LoggerAwareTrait;

    /** @var Box */
    protected $box;

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

    /**
     * @var OrientatedItem[]
     */
    protected static $emptyBoxCache = [];

    public function __construct(Box $box)
    {
        $this->box = $box;
        $this->logger = new NullLogger();
    }

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

    /**
     * Get the best orientation for an item.
     */
    public function getBestOrientation(
        Item $item,
        ?OrientatedItem $prevItem,
        ItemList $nextItems,
        int $widthLeft,
        int $lengthLeft,
        int $depthLeft,
        int $rowLength,
        int $x,
        int $y,
        int $z,
        PackedItemList $prevPackedItemList
    ): ?OrientatedItem {
        $this->logger->debug(
            "evaluating item {$item->getDescription()} for fit",
            [
                'item' => $item,
                'space' => [
                    'widthLeft' => $widthLeft,
                    'lengthLeft' => $lengthLeft,
                    'depthLeft' => $depthLeft,
                ],
            ]
        );

        $possibleOrientations = $this->getPossibleOrientations($item, $prevItem, $widthLeft, $lengthLeft, $depthLeft, $x, $y, $z, $prevPackedItemList);
        $usableOrientations = $this->getUsableOrientations($item, $possibleOrientations);

        if (empty($usableOrientations)) {
            return null;
        }

        $sorter = new OrientatedItemSorter($this, $this->singlePassMode, $widthLeft, $lengthLeft, $depthLeft, $nextItems, $rowLength, $x, $y, $z, $prevPackedItemList);
        $sorter->setLogger($this->logger);
        usort($usableOrientations, $sorter);

        $this->logger->debug('Selected best fit orientation', ['orientation' => $usableOrientations[0]]);

        return $usableOrientations[0];
    }

    /**
     * Find all possible orientations for an item.
     *
     * @return OrientatedItem[]
     */
    public function getPossibleOrientations(
        Item $item,
        ?OrientatedItem $prevItem,
        int $widthLeft,
        int $lengthLeft,
        int $depthLeft,
        int $x,
        int $y,
        int $z,
        PackedItemList $prevPackedItemList
    ): array {
        $permutations = $this->generatePermutations($item, $prevItem);

        //remove any that simply don't fit
        $orientations = [];
        foreach ($permutations as $dimensions) {
            if ($dimensions[0] <= $widthLeft && $dimensions[1] <= $lengthLeft && $dimensions[2] <= $depthLeft) {
                $orientations[] = new OrientatedItem($item, $dimensions[0], $dimensions[1], $dimensions[2]);
            }
        }

        if ($item instanceof ConstrainedPlacementItem) {
            $orientations = array_filter($orientations, function (OrientatedItem $i) use ($x, $y, $z, $prevPackedItemList) {
                return $i->getItem()->canBePacked($this->box, $prevPackedItemList, $x, $y, $z, $i->getWidth(), $i->getLength(), $i->getDepth());
            });
        }

        return $orientations;
    }

    /**
     * @return OrientatedItem[]
     */
    public function getPossibleOrientationsInEmptyBox(Item $item): array
    {
        $cacheKey = $item->getWidth() .
            '|' .
            $item->getLength() .
            '|' .
            $item->getDepth() .
            '|' .
            ($item->getKeepFlat() ? '2D' : '3D') .
            '|' .
            $this->box->getInnerWidth() .
            '|' .
            $this->box->getInnerLength() .
            '|' .
            $this->box->getInnerDepth();

        if (isset(static::$emptyBoxCache[$cacheKey])) {
            $orientations = static::$emptyBoxCache[$cacheKey];
        } else {
            $orientations = $this->getPossibleOrientations(
                $item,
                null,
                $this->box->getInnerWidth(),
                $this->box->getInnerLength(),
                $this->box->getInnerDepth(),
                0,
                0,
                0,
                new PackedItemList()
            );
            static::$emptyBoxCache[$cacheKey] = $orientations;
        }

        return $orientations;
    }

    /**
     * @param  OrientatedItem[] $possibleOrientations
     * @return OrientatedItem[]
     */
    protected function getUsableOrientations(
        Item $item,
        array $possibleOrientations
    ): array {
        $orientationsToUse = $stableOrientations = $unstableOrientations = [];

        // Divide possible orientations into stable (low centre of gravity) and unstable (high centre of gravity)
        foreach ($possibleOrientations as $orientation) {
            if ($orientation->isStable() || $this->box->getInnerDepth() === $orientation->getDepth()) {
                $stableOrientations[] = $orientation;
            } else {
                $unstableOrientations[] = $orientation;
            }
        }

        /*
         * We prefer to use stable orientations only, but allow unstable ones if
         * the item doesn't fit in the box any other way
         */
        if (count($stableOrientations) > 0) {
            $orientationsToUse = $stableOrientations;
        } elseif (count($unstableOrientations) > 0) {
            $stableOrientationsInEmptyBox = $this->getStableOrientationsInEmptyBox($item);

            if (count($stableOrientationsInEmptyBox) === 0) {
                $orientationsToUse = $unstableOrientations;
            }
        }

        return $orientationsToUse;
    }

    /**
     * Return the orientations for this item if it were to be placed into the box with nothing else.
     */
    protected function getStableOrientationsInEmptyBox(Item $item): array
    {
        $orientationsInEmptyBox = $this->getPossibleOrientationsInEmptyBox($item);

        return array_filter(
            $orientationsInEmptyBox,
            function (OrientatedItem $orientation) {
                return $orientation->isStable();
            }
        );
    }

    private function generatePermutations(Item $item, ?OrientatedItem $prevItem): array
    {
        $permutations = [];

        //Special case items that are the same as what we just packed - keep orientation
        if ($prevItem && $prevItem->isSameDimensions($item)) {
            $permutations[] = [$prevItem->getWidth(), $prevItem->getLength(), $prevItem->getDepth()];
        } else {
            //simple 2D rotation
            $permutations[] = [$item->getWidth(), $item->getLength(), $item->getDepth()];
            $permutations[] = [$item->getLength(), $item->getWidth(), $item->getDepth()];

            //add 3D rotation if we're allowed
            if (!$item->getKeepFlat()) {
                $permutations[] = [$item->getWidth(), $item->getDepth(), $item->getLength()];
                $permutations[] = [$item->getLength(), $item->getDepth(), $item->getWidth()];
                $permutations[] = [$item->getDepth(), $item->getWidth(), $item->getLength()];
                $permutations[] = [$item->getDepth(), $item->getLength(), $item->getWidth()];
            }
        }

        return $permutations;
    }
}


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 array_filter;
12		use function count;
13		use Psr\Log\LoggerAwareInterface;
14		use Psr\Log\LoggerAwareTrait;
15		use Psr\Log\NullLogger;
16		use function usort;
17
18		/**
19		* Figure out orientations for an item and a given set of dimensions.
20		*
21		* @author Doug Wright
22		* @internal
23		*/
24		class OrientatedItemFactory implements LoggerAwareInterface
25		{
26		use LoggerAwareTrait;
27
28		/** @var Box */
29		protected $box;
30
31		/**
32		* Whether the packer is in single-pass mode.
33		*
34		* @var bool
35		*/
36		protected $singlePassMode = false;
37
38		/**
39		* @var OrientatedItem[]
40		*/
41		protected static $emptyBoxCache = [];
42
43	59	public function __construct(Box $box)
44		{
45	59	$this->box = $box;
46	59	$this->logger = new NullLogger();
47	59	}
48
49	52	public function setSinglePassMode(bool $singlePassMode): void
50		{
51	52	$this->singlePassMode = $singlePassMode;
52	52	}
53
54		/**
55		* Get the best orientation for an item.
56		*/
57	57	public function getBestOrientation(
58		Item $item,
59		?OrientatedItem $prevItem,
60		ItemList $nextItems,
61		int $widthLeft,
62		int $lengthLeft,
63		int $depthLeft,
64		int $rowLength,
65		int $x,
66		int $y,
67		int $z,
68		PackedItemList $prevPackedItemList
69		): ?OrientatedItem {
70	57	$this->logger->debug(
71	57	"evaluating item {$item->getDescription()} for fit",
72		[
73	57	'item' => $item,
74		'space' => [
75	57	'widthLeft' => $widthLeft,
76	57	'lengthLeft' => $lengthLeft,
77	57	'depthLeft' => $depthLeft,
78		],
79		]
80		);
81
82	57	$possibleOrientations = $this->getPossibleOrientations($item, $prevItem, $widthLeft, $lengthLeft, $depthLeft, $x, $y, $z, $prevPackedItemList);
83	57	$usableOrientations = $this->getUsableOrientations($item, $possibleOrientations);
84
85	57	if (empty($usableOrientations)) {
86	51	return null;
87		}
88
89	57	$sorter = new OrientatedItemSorter($this, $this->singlePassMode, $widthLeft, $lengthLeft, $depthLeft, $nextItems, $rowLength, $x, $y, $z, $prevPackedItemList);
90	57	$sorter->setLogger($this->logger);
91	57	usort($usableOrientations, $sorter);
92
93	57	$this->logger->debug('Selected best fit orientation', ['orientation' => $usableOrientations[0]]);
94
95	57	return $usableOrientations[0];
96		}
97
98		/**
99		* Find all possible orientations for an item.
100		*
101		* @return OrientatedItem[]
102		*/
103	58	public function getPossibleOrientations(
104		Item $item,
105		?OrientatedItem $prevItem,
106		int $widthLeft,
107		int $lengthLeft,
108		int $depthLeft,
109		int $x,
110		int $y,
111		int $z,
112		PackedItemList $prevPackedItemList
113		): array {
114	58	$permutations = $this->generatePermutations($item, $prevItem);
115
116		//remove any that simply don't fit
117	58	$orientations = [];
118	58	foreach ($permutations as $dimensions) {
119	58	if ($dimensions[0] <= $widthLeft && $dimensions[1] <= $lengthLeft && $dimensions[2] <= $depthLeft) {
120	57	$orientations[] = new OrientatedItem($item, $dimensions[0], $dimensions[1], $dimensions[2]);
121		}
122		}
123
124	58	if ($item instanceof ConstrainedPlacementItem) {
125		$orientations = array_filter($orientations, function (OrientatedItem $i) use ($x, $y, $z, $prevPackedItemList) {
126	2	return $i->getItem()->canBePacked($this->box, $prevPackedItemList, $x, $y, $z, $i->getWidth(), $i->getLength(), $i->getDepth());
127	2	});
128		}
129
130	58	return $orientations;
131		}
132
133		/**
134		* @return OrientatedItem[]
135		*/
136	33	public function getPossibleOrientationsInEmptyBox(Item $item): array
137		{
138	33	$cacheKey = $item->getWidth() .
139	33	'\|' .
140	33	$item->getLength() .
141	33	'\|' .
142	33	$item->getDepth() .
143	33	'\|' .
144	33	($item->getKeepFlat() ? '2D' : '3D') .
145	33	'\|' .
146	33	$this->box->getInnerWidth() .
147	33	'\|' .
148	33	$this->box->getInnerLength() .
149	33	'\|' .
150	33	$this->box->getInnerDepth();
151
152	33	if (isset(static::$emptyBoxCache[$cacheKey])) {
153	27	$orientations = static::$emptyBoxCache[$cacheKey];
154		} else {
155	29	$orientations = $this->getPossibleOrientations(
156	29	$item,
157	29	null,
158	29	$this->box->getInnerWidth(),
159	29	$this->box->getInnerLength(),
160	29	$this->box->getInnerDepth(),
161	29	0,
162	29	0,
163	29	0,
164	29	new PackedItemList()
165		);
166	29	static::$emptyBoxCache[$cacheKey] = $orientations;
167		}
168
169	33	return $orientations;
170		}
171
172		/**
173		* @param OrientatedItem[] $possibleOrientations
174		* @return OrientatedItem[]
175		*/
176	57	protected function getUsableOrientations(
177		Item $item,
178		array $possibleOrientations
179		): array {
180	57	$orientationsToUse = $stableOrientations = $unstableOrientations = [];
181
182		// Divide possible orientations into stable (low centre of gravity) and unstable (high centre of gravity)
183	57	foreach ($possibleOrientations as $orientation) {
184	57	if ($orientation->isStable() \|\| $this->box->getInnerDepth() === $orientation->getDepth()) {
185	55	$stableOrientations[] = $orientation;
186		} else {
187	10	$unstableOrientations[] = $orientation;
188		}
189		}
190
191		/*
192		* We prefer to use stable orientations only, but allow unstable ones if
193		* the item doesn't fit in the box any other way
194		*/
195	57	if (count($stableOrientations) > 0) {
196	55	$orientationsToUse = $stableOrientations;
197	51	} elseif (count($unstableOrientations) > 0) {
198	10	$stableOrientationsInEmptyBox = $this->getStableOrientationsInEmptyBox($item);
199
200	10	if (count($stableOrientationsInEmptyBox) === 0) {
201	7	$orientationsToUse = $unstableOrientations;
202		}
203		}
204
205	57	return $orientationsToUse;
206		}
207
208		/**
209		* Return the orientations for this item if it were to be placed into the box with nothing else.
210		*/
211	10	protected function getStableOrientationsInEmptyBox(Item $item): array
212		{
213	10	$orientationsInEmptyBox = $this->getPossibleOrientationsInEmptyBox($item);
214
215	10	return array_filter(
216	10	$orientationsInEmptyBox,
217		function (OrientatedItem $orientation) {
218	10	return $orientation->isStable();
219	10	}
220		);
221		}
222
223	58	private function generatePermutations(Item $item, ?OrientatedItem $prevItem): array
224		{
225	58	$permutations = [];
226
227		//Special case items that are the same as what we just packed - keep orientation
228	58	if ($prevItem && $prevItem->isSameDimensions($item)) {
229	47	$permutations[] = [$prevItem->getWidth(), $prevItem->getLength(), $prevItem->getDepth()];
230		} else {
231		//simple 2D rotation
232	58	$permutations[] = [$item->getWidth(), $item->getLength(), $item->getDepth()];
233	58	$permutations[] = [$item->getLength(), $item->getWidth(), $item->getDepth()];
234
235		//add 3D rotation if we're allowed
236	58	if (!$item->getKeepFlat()) {
237	40	$permutations[] = [$item->getWidth(), $item->getDepth(), $item->getLength()];
238	40	$permutations[] = [$item->getLength(), $item->getDepth(), $item->getWidth()];
239	40	$permutations[] = [$item->getDepth(), $item->getWidth(), $item->getLength()];
240	40	$permutations[] = [$item->getDepth(), $item->getLength(), $item->getWidth()];
241		}
242		}
243
244	58	return $permutations;
245		}
246		}
247

dvdoug / BoxPacker

Push — master ( e56742...2ecca9 )

OrientatedItemFactory::generatePermutations() A

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