OrientatedItemFactory::calculateAdditionalItemsPackedWithThisOrientation() - Code Metrics - Inspection of "Add a better form of lookahead to properly fix #89" - dvdoug/BoxPacker - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Push — issue_147 ( 80ed33 )

by Doug

created 2018-11-04 22:51 UTC

calculateAdditionalItemsPackedWithThisOrientation() B

↳ Parent: OrientatedItemFactory

Complexity

Conditions	7
Paths	9

Size

Total Lines	39
Code Lines	22

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	23
CRAP Score	7

Importance

Changes

Metric	Value
cc	7
eloc	22
nc	9
nop	5
dl	0
loc	39
ccs	23
cts	23
cp	1
crap	7
rs	8.6346
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 Psr\Log\LoggerAwareInterface;
use Psr\Log\LoggerAwareTrait;
use function array_filter;
use function count;
use function min;
use function reset;
use function sort;
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;

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

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

    /**
     * Get the best orientation for an item.
     *
     * @param Item $item
     * @param OrientatedItem|null $prevItem
     * @param ItemList $nextItems
     * @param bool $isLastItem
     * @param int $widthLeft
     * @param int $lengthLeft
     * @param int $depthLeft
     *
     * @return OrientatedItem|null
     */
    public function getBestOrientation(
        Item $item,
        ?OrientatedItem $prevItem,
        ItemList $nextItems,
        bool $isLastItem,
        int $widthLeft,
        int $lengthLeft,
        int $depthLeft
    ): ?OrientatedItem {
        $possibleOrientations = $this->getPossibleOrientations($item, $prevItem, $widthLeft, $lengthLeft, $depthLeft);
        $usableOrientations = $this->getUsableOrientations($item, $possibleOrientations, $isLastItem);

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

        usort($usableOrientations, function (OrientatedItem $a, OrientatedItem $b) use ($widthLeft, $lengthLeft, $depthLeft, $nextItems) {
            $orientationAWidthLeft = $widthLeft - $a->getWidth();
            $orientationALengthLeft = $lengthLeft - $a->getLength();
            $orientationADepthLeft = $depthLeft - $a->getDepth();
            $orientationBWidthLeft = $widthLeft - $b->getWidth();
            $orientationBLengthLeft = $lengthLeft - $b->getLength();
            $orientationBDepthLeft = $depthLeft - $b->getDepth();

            $orientationAMinGap = min($orientationAWidthLeft, $orientationALengthLeft);
            $orientationBMinGap = min($orientationBWidthLeft, $orientationBLengthLeft);

            if ($orientationAMinGap === 0) { // prefer A if it leaves no gap
                return -1;
            }
            if ($orientationBMinGap === 0) { // prefer B if it leaves no gap
                return 1;
            }

            // prefer leaving room for next item in current row
            if ($nextItems->count()) {
                $nextItemFitA = count($this->getPossibleOrientations($nextItems->top(), $a, $orientationAWidthLeft, $lengthLeft, $depthLeft));
                $nextItemFitB = count($this->getPossibleOrientations($nextItems->top(), $b, $orientationBWidthLeft, $lengthLeft, $depthLeft));
                if ($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);
                $additionalPackedB = $this->calculateAdditionalItemsPackedWithThisOrientation($b, $nextItems, $widthLeft, $lengthLeft, $depthLeft);
                if ($additionalPackedA !== $additionalPackedB) {
                    return $additionalPackedB <=> $additionalPackedA;
                }
            }
            // otherwise prefer leaving minimum possible gap, or the greatest footprint
            return $orientationADepthLeft <=> $orientationBDepthLeft ?: $orientationAMinGap <=> $orientationBMinGap ?: $a->getSurfaceFootprint() <=> $b->getSurfaceFootprint();
        });

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

        return $bestFit;
    }

    /**
     * Find all possible orientations for an item.
     *
     * @param Item                $item
     * @param OrientatedItem|null $prevItem
     * @param int                 $widthLeft
     * @param int                 $lengthLeft
     * @param int                 $depthLeft
     *
     * @return OrientatedItem[]
     */
    public function getPossibleOrientations(
        Item $item,
        ?OrientatedItem $prevItem,
        int $widthLeft,
        int $lengthLeft,
        int $depthLeft
    ): array {
        $orientations = [];

        //Special case items that are the same as what we just packed - keep orientation
        if ($prevItem && $this->isSameDimensions($prevItem->getItem(), $item)) {
            $orientations[] = new OrientatedItem($item, $prevItem->getWidth(), $prevItem->getLength(), $prevItem->getDepth());
        } else {

            //simple 2D rotation
            $orientations[] = new OrientatedItem($item, $item->getWidth(), $item->getLength(), $item->getDepth());
            $orientations[] = new OrientatedItem($item, $item->getLength(), $item->getWidth(), $item->getDepth());

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

        //remove any that simply don't fit
        return array_filter($orientations, function (OrientatedItem $i) use ($widthLeft, $lengthLeft, $depthLeft) {
            return $i->getWidth() <= $widthLeft && $i->getLength() <= $lengthLeft && $i->getDepth() <= $depthLeft;
        });
    }

    /**
     * @param Item $item
     * @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(),
                $this->box->getInnerDepth()
            );
            static::$emptyBoxCache[$cacheKey] = $orientations;
        }

        return $orientations;

    }

    /**
     * @param Item $item
     * @param OrientatedItem[] $possibleOrientations
     * @param bool $isLastItem
     *
     * @return OrientatedItem[]
     */
    protected function getUsableOrientations(
        Item $item,
        $possibleOrientations,
        bool $isLastItem
    ): 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()) {
                $stableOrientations[] = $orientation;
            } else {
                $unstableOrientations[] = $orientation;
            }
        }

        /*
         * We prefer to use stable orientations only, but allow unstable ones if either
         * the item is the last one left to pack OR
         * 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 ($isLastItem || count($stableOrientationsInEmptyBox) === 0) {
                $orientationsToUse = $unstableOrientations;
            }
        }

        return $orientationsToUse;
    }

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

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

    /**
     * Compare two items to see if they have same dimensions.
     *
     * @param Item $itemA
     * @param Item $itemB
     *
     * @return bool
     */
    protected function isSameDimensions(Item $itemA, Item $itemB): bool
    {
        $itemADimensions = [$itemA->getWidth(), $itemA->getLength(), $itemA->getDepth()];
        $itemBDimensions = [$itemB->getWidth(), $itemB->getLength(), $itemB->getDepth()];
        sort($itemADimensions);
        sort($itemBDimensions);

        return $itemADimensions === $itemBDimensions;
    }

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

        // first try packing into current row
        $workingSetItems = clone $nextItems;
        $widthLeft = $originalWidthLeft - $prevItem->getWidth();
        $lengthLeft = $originalLengthLeft;
        while (count($workingSetItems) > 0 && $widthLeft > 0) {
            $itemToPack = $workingSetItems->extract();
            $orientatedItem = $this->getBestOrientation($itemToPack, $prevItem, $workingSetItems, !count($workingSetItems), $widthLeft, $lengthLeft, $depthLeft);
            if ($orientatedItem instanceof OrientatedItem) {
                $packedCount++;
                $widthLeft -= $orientatedItem->getWidth();
                $prevItem = $orientatedItem;
            }
        }

        // then see what happens if we try in the next row
        $workingSetItems = clone $nextItems;
        $widthLeft = $originalWidthLeft;
        $lengthLeft = $originalLengthLeft - $prevItem->getLength();
        while (count($workingSetItems) > 0 && $widthLeft > 0) {
            $itemToPack = $workingSetItems->extract();
            $orientatedItem = $this->getBestOrientation($itemToPack, $prevItem, $workingSetItems, !count($workingSetItems), $widthLeft, $lengthLeft, $depthLeft);
            if ($orientatedItem instanceof OrientatedItem) {
                $packedCount++;
                $widthLeft -= $orientatedItem->getWidth();
                $prevItem = $orientatedItem;
            }
        }

        return $packedCount; // this isn't scientific, but is a reasonable proxy for success from an actual forward packing
    }
}


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		use function array_filter;
14		use function count;
15		use function min;
16		use function reset;
17		use function sort;
18		use function usort;
19
20		/**
21		* Figure out orientations for an item and a given set of dimensions.
22		*
23		* @author Doug Wright
24		* @internal
25		*/
26		class OrientatedItemFactory implements LoggerAwareInterface
27		{
28		use LoggerAwareTrait;
29
30		/** @var Box */
31		protected $box;
32
33		/**
34		* @var OrientatedItem[]
35		*/
36		protected static $emptyBoxCache = [];
37
38	22	public function __construct(Box $box)
39		{
40	22	$this->box = $box;
41	22	}
42
43		/**
44		* Get the best orientation for an item.
45		*
46		* @param Item $item
47		* @param OrientatedItem\|null $prevItem
48		* @param ItemList $nextItems
49		* @param bool $isLastItem
50		* @param int $widthLeft
51		* @param int $lengthLeft
52		* @param int $depthLeft
53		*
54		* @return OrientatedItem\|null
55		*/
56	21	public function getBestOrientation(
57		Item $item,
58		?OrientatedItem $prevItem,
59		ItemList $nextItems,
60		bool $isLastItem,
61		int $widthLeft,
62		int $lengthLeft,
63		int $depthLeft
64		): ?OrientatedItem {
65	21	$possibleOrientations = $this->getPossibleOrientations($item, $prevItem, $widthLeft, $lengthLeft, $depthLeft);
66	21	$usableOrientations = $this->getUsableOrientations($item, $possibleOrientations, $isLastItem);
67
68	21	if (empty($usableOrientations)) {
69	20	return null;
70		}
71
72		usort($usableOrientations, function (OrientatedItem $a, OrientatedItem $b) use ($widthLeft, $lengthLeft, $depthLeft, $nextItems) {
73	21	$orientationAWidthLeft = $widthLeft - $a->getWidth();
74	21	$orientationALengthLeft = $lengthLeft - $a->getLength();
75	21	$orientationADepthLeft = $depthLeft - $a->getDepth();
76	21	$orientationBWidthLeft = $widthLeft - $b->getWidth();
77	21	$orientationBLengthLeft = $lengthLeft - $b->getLength();
78	21	$orientationBDepthLeft = $depthLeft - $b->getDepth();
79
80	21	$orientationAMinGap = min($orientationAWidthLeft, $orientationALengthLeft);
81	21	$orientationBMinGap = min($orientationBWidthLeft, $orientationBLengthLeft);
82
83	21	if ($orientationAMinGap === 0) { // prefer A if it leaves no gap
84	7	return -1;
85		}
86	17	if ($orientationBMinGap === 0) { // prefer B if it leaves no gap
87	1	return 1;
88		}
89
90		// prefer leaving room for next item in current row
91	16	if ($nextItems->count()) {
92	15	$nextItemFitA = count($this->getPossibleOrientations($nextItems->top(), $a, $orientationAWidthLeft, $lengthLeft, $depthLeft));
93	15	$nextItemFitB = count($this->getPossibleOrientations($nextItems->top(), $b, $orientationBWidthLeft, $lengthLeft, $depthLeft));
94	15	if ($nextItemFitA && !$nextItemFitB) {
95		return -1;
96		}
97	15	if ($nextItemFitB && !$nextItemFitA) {
98	2	return 1;
99		}
100
101		// if not an easy either/or, do a partial lookahead
102	13	$additionalPackedA = $this->calculateAdditionalItemsPackedWithThisOrientation($a, $nextItems, $widthLeft, $lengthLeft, $depthLeft);
103	13	$additionalPackedB = $this->calculateAdditionalItemsPackedWithThisOrientation($b, $nextItems, $widthLeft, $lengthLeft, $depthLeft);
104	13	if ($additionalPackedA !== $additionalPackedB) {
105	2	return $additionalPackedB <=> $additionalPackedA;
106		}
107		}
108		// otherwise prefer leaving minimum possible gap, or the greatest footprint
109	13	return $orientationADepthLeft <=> $orientationBDepthLeft ?: $orientationAMinGap <=> $orientationBMinGap ?: $a->getSurfaceFootprint() <=> $b->getSurfaceFootprint();
110	21	});
111
112	21	$bestFit = reset($usableOrientations);
113	21	$this->logger->debug('Selected best fit orientation', ['orientation' => $bestFit]);
114
115	21	return $bestFit;
116		}
117
118		/**
119		* Find all possible orientations for an item.
120		*
121		* @param Item $item
122		* @param OrientatedItem\|null $prevItem
123		* @param int $widthLeft
124		* @param int $lengthLeft
125		* @param int $depthLeft
126		*
127		* @return OrientatedItem[]
128		*/
129	21	public function getPossibleOrientations(
130		Item $item,
131		?OrientatedItem $prevItem,
132		int $widthLeft,
133		int $lengthLeft,
134		int $depthLeft
135		): array {
136	21	$orientations = [];
137
138		//Special case items that are the same as what we just packed - keep orientation
139	21	if ($prevItem && $this->isSameDimensions($prevItem->getItem(), $item)) {
140	17	$orientations[] = new OrientatedItem($item, $prevItem->getWidth(), $prevItem->getLength(), $prevItem->getDepth());
141		} else {
142
143		//simple 2D rotation
144	21	$orientations[] = new OrientatedItem($item, $item->getWidth(), $item->getLength(), $item->getDepth());
145	21	$orientations[] = new OrientatedItem($item, $item->getLength(), $item->getWidth(), $item->getDepth());
146
147		//add 3D rotation if we're allowed
148	21	if (!$item->getKeepFlat()) {
149	13	$orientations[] = new OrientatedItem($item, $item->getWidth(), $item->getDepth(), $item->getLength());
150	13	$orientations[] = new OrientatedItem($item, $item->getLength(), $item->getDepth(), $item->getWidth());
151	13	$orientations[] = new OrientatedItem($item, $item->getDepth(), $item->getWidth(), $item->getLength());
152	13	$orientations[] = new OrientatedItem($item, $item->getDepth(), $item->getLength(), $item->getWidth());
153		}
154		}
155
156		//remove any that simply don't fit
157		return array_filter($orientations, function (OrientatedItem $i) use ($widthLeft, $lengthLeft, $depthLeft) {
158	21	return $i->getWidth() <= $widthLeft && $i->getLength() <= $lengthLeft && $i->getDepth() <= $depthLeft;
159	21	});
160		}
161
162		/**
163		* @param Item $item
164		* @return OrientatedItem[]
165		*/
166	22	public function getPossibleOrientationsInEmptyBox(Item $item): array
167		{
168	22	$cacheKey = $item->getWidth().
169	22	'\|'.
170	22	$item->getLength().
171	22	'\|'.
172	22	$item->getDepth().
173	22	'\|'.
174	22	($item->getKeepFlat() ? '2D' : '3D').
175	22	'\|'.
176	22	$this->box->getInnerWidth().
177	22	'\|'.
178	22	$this->box->getInnerLength().
179	22	'\|'.
180	22	$this->box->getInnerDepth();
181
182	22	if (isset(static::$emptyBoxCache[$cacheKey])) {
183	22	$orientations = static::$emptyBoxCache[$cacheKey];
184		} else {
185	20	$orientations = $this->getPossibleOrientations(
186	20	$item,
187	20	null,
188	20	$this->box->getInnerWidth(),
189	20	$this->box->getInnerLength(),
190	20	$this->box->getInnerDepth()
191		);
192	20	static::$emptyBoxCache[$cacheKey] = $orientations;
193		}
194
195	22	return $orientations;
		1 ignored issue – show Bug Best Practice introduced 2018-01-07 15:59 UTC by Report Bug Copy Issue Report The expression `return $orientations` could return the type `DVDoug\BoxPacker\OrientatedItem` which is incompatible with the type-hinted return `array`. Consider adding an additional type-check to rule them out. Loading history...
196		}
197
198		/**
199		* @param Item $item
200		* @param OrientatedItem[] $possibleOrientations
201		* @param bool $isLastItem
202		*
203		* @return OrientatedItem[]
204		*/
205	21	protected function getUsableOrientations(
206		Item $item,
207		$possibleOrientations,
208		bool $isLastItem
209		): array {
210	21	$orientationsToUse = $stableOrientations = $unstableOrientations = [];
211
212		// Divide possible orientations into stable (low centre of gravity) and unstable (high centre of gravity)
213	21	foreach ($possibleOrientations as $orientation) {
214	21	if ($orientation->isStable()) {
215	21	$stableOrientations[] = $orientation;
216		} else {
217	21	$unstableOrientations[] = $orientation;
218		}
219		}
220
221		/*
222		* We prefer to use stable orientations only, but allow unstable ones if either
223		* the item is the last one left to pack OR
224		* the item doesn't fit in the box any other way
225		*/
226	21	if (count($stableOrientations) > 0) {
227	21	$orientationsToUse = $stableOrientations;
228	20	} elseif (count($unstableOrientations) > 0) {
229		$stableOrientationsInEmptyBox = $this->getStableOrientationsInEmptyBox($item);
230
231		if ($isLastItem \|\| count($stableOrientationsInEmptyBox) === 0) {
232		$orientationsToUse = $unstableOrientations;
233		}
234		}
235
236	21	return $orientationsToUse;
237		}
238
239		/**
240		* Return the orientations for this item if it were to be placed into the box with nothing else.
241		*
242		* @param Item $item
243		* @return array
244		*/
245		protected function getStableOrientationsInEmptyBox(Item $item): array
246		{
247		$orientationsInEmptyBox = $this->getPossibleOrientationsInEmptyBox($item);
248
249		return array_filter(
250		$orientationsInEmptyBox,
251		function (OrientatedItem $orientation) {
252		return $orientation->isStable();
253		}
254		);
255		}
256
257		/**
258		* Compare two items to see if they have same dimensions.
259		*
260		* @param Item $itemA
261		* @param Item $itemB
262		*
263		* @return bool
264		*/
265	19	protected function isSameDimensions(Item $itemA, Item $itemB): bool
266		{
267	19	$itemADimensions = [$itemA->getWidth(), $itemA->getLength(), $itemA->getDepth()];
268	19	$itemBDimensions = [$itemB->getWidth(), $itemB->getLength(), $itemB->getDepth()];
269	19	sort($itemADimensions);
270	19	sort($itemBDimensions);
271
272	19	return $itemADimensions === $itemBDimensions;
273		}
274
275		/**
276		* Approximation of a forward-looking packing.
277		*
278		* Not an actual packing, that has additional logic regarding constraints and stackability, this focuses
279		* purely on fit.
280		*
281		* @param OrientatedItem $prevItem
282		* @param ItemList $nextItems
283		* @param int $originalWidthLeft
284		* @param int $originalLengthLeft
285		* @param int $depthLeft
286		* @return int
287		*/
288	13	protected function calculateAdditionalItemsPackedWithThisOrientation(
289		OrientatedItem $prevItem,
290		ItemList $nextItems,
291		int $originalWidthLeft,
292		int $originalLengthLeft,
293		int $depthLeft
294		): int
295		{
296	13	$packedCount = 0;
297
298		// first try packing into current row
299	13	$workingSetItems = clone $nextItems;
300	13	$widthLeft = $originalWidthLeft - $prevItem->getWidth();
301	13	$lengthLeft = $originalLengthLeft;
302	13	while (count($workingSetItems) > 0 && $widthLeft > 0) {
303	13	$itemToPack = $workingSetItems->extract();
304	13	$orientatedItem = $this->getBestOrientation($itemToPack, $prevItem, $workingSetItems, !count($workingSetItems), $widthLeft, $lengthLeft, $depthLeft);
305	13	if ($orientatedItem instanceof OrientatedItem) {
306	6	$packedCount++;
307	6	$widthLeft -= $orientatedItem->getWidth();
308	6	$prevItem = $orientatedItem;
309		}
310		}
311
312		// then see what happens if we try in the next row
313	13	$workingSetItems = clone $nextItems;
314	13	$widthLeft = $originalWidthLeft;
315	13	$lengthLeft = $originalLengthLeft - $prevItem->getLength();
316	13	while (count($workingSetItems) > 0 && $widthLeft > 0) {
317	13	$itemToPack = $workingSetItems->extract();
318	13	$orientatedItem = $this->getBestOrientation($itemToPack, $prevItem, $workingSetItems, !count($workingSetItems), $widthLeft, $lengthLeft, $depthLeft);
319	13	if ($orientatedItem instanceof OrientatedItem) {
320	6	$packedCount++;
321	6	$widthLeft -= $orientatedItem->getWidth();
322	6	$prevItem = $orientatedItem;
323		}
324		}
325
326	13	return $packedCount; // this isn't scientific, but is a reasonable proxy for success from an actual forward packing
327		}
328		}
329

dvdoug / BoxPacker

Push — issue_147 ( 80ed33 )

calculateAdditionalItemsPackedWithThisOrientation() B

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