VolumePacker::tryAndStackItemsIntoSpace() - Code Metrics - Inspection of "Expose additional positional info in v2 as request..." - dvdoug/BoxPacker - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Push — 2.x-dev ( 794087...7794d8 )

by Doug

created 2018-11-18 19:11 UTC

VolumePacker::tryAndStackItemsIntoSpace() A

↳ Parent: VolumePacker

Complexity

Conditions	4
Paths	3

Size

Total Lines	29
Code Lines	17

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	17
CRAP Score	4

Importance

Changes

Metric	Value
cc	4
eloc	17
nc	3
nop	9
dl	0
loc	29
ccs	17
cts	17
cp	1
crap	4
rs	9.7
c	0
b	0
f	0

How to fix Many Parameters

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

namespace DVDoug\BoxPacker;

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

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

    /**
     * Box to pack items into.
     *
     * @var Box
     */
    protected $box;

    /**
     * @var int
     */
    protected $boxWidth;

    /**
     * @var int
     */
    protected $boxLength;

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

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

    /**
     * Remaining weight capacity of the box.
     *
     * @var int
     */
    protected $remainingWeight;

    /**
     * Whether the box was rotated for packing.
     *
     * @var bool
     */
    protected $boxRotated = false;

    /**
     * @var PackedLayer[]
     */
    protected $layers = [];

    /**
     * Constructor.
     *
     * @param Box      $box
     * @param ItemList $items
     */
    public function __construct(Box $box, ItemList $items)
    {
        $this->box = $box;
        $this->items = $items;

        $this->boxWidth = max($this->box->getInnerWidth(), $this->box->getInnerLength());
        $this->boxLength = min($this->box->getInnerWidth(), $this->box->getInnerLength());
        $this->remainingWeight = $this->box->getMaxWeight() - $this->box->getEmptyWeight();
        $this->skippedItems = new ItemList();
        $this->logger = new NullLogger();

        // we may have just rotated the box for packing purposes, record if we did
        if ($this->box->getInnerWidth() !== $this->boxWidth || $this->box->getInnerLength() !== $this->boxLength) {
            $this->boxRotated = true;
        }
    }

    /**
     * Pack as many items as possible into specific given box.
     *
     * @return PackedBox packed box
     */
    public function pack()
    {
        $this->logger->debug("[EVALUATING BOX] {$this->box->getReference()}");

        while (count($this->items) > 0) {
            $layerStartDepth = $this->getCurrentPackedDepth();
            $this->packLayer($layerStartDepth, $this->boxWidth, $this->boxLength, $this->box->getInnerDepth() - $layerStartDepth);
        }

        if ($this->boxRotated) {
            $this->rotateLayersNinetyDegrees();
        }

        $this->stabiliseLayers();

        $this->logger->debug('done with this box');

        return PackedBox::fromPackedItemList($this->box, $this->getPackedItemList());
    }

    /**
     * Pack items into an individual vertical layer.
     *
     * @param int $startDepth
     * @param int $widthLeft
     * @param int $lengthLeft
     * @param int $depthLeft
     */
    protected function packLayer($startDepth, $widthLeft, $lengthLeft, $depthLeft)
    {
        $this->layers[] = $layer = new PackedLayer();
        $prevItem = null;
        $x = $y = $rowWidth = $rowLength = $layerDepth = 0;

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

            //skip items that are simply too heavy or too large
            if (!$this->checkConstraints($itemToPack)) {
                $this->rebuildItemList();
                continue;
            }

            $orientatedItem = $this->getOrientationForItem($itemToPack, $prevItem, $this->items, $this->hasItemsLeftToPack(), $widthLeft, $lengthLeft, $depthLeft);

            if ($orientatedItem instanceof OrientatedItem) {
                $packedItem = PackedItem::fromOrientatedItem($orientatedItem, $x, $y, $startDepth);
                $layer->insert($packedItem);
                $this->remainingWeight -= $orientatedItem->getItem()->getWeight();
                $widthLeft -= $orientatedItem->getWidth();

                $rowWidth += $orientatedItem->getWidth();
                $rowLength = max($rowLength, $orientatedItem->getLength());
                $layerDepth = max($layerDepth, $orientatedItem->getDepth());

                //allow items to be stacked in place within the same footprint up to current layer depth
                $stackableDepth = $layerDepth - $orientatedItem->getDepth();
                $this->tryAndStackItemsIntoSpace($layer, $prevItem, $this->items, $orientatedItem->getWidth(), $orientatedItem->getLength(), $stackableDepth, $x, $y, $startDepth + $orientatedItem->getDepth());
                $x += $orientatedItem->getWidth();

                $prevItem = $packedItem;
                $this->rebuildItemList();
            } elseif (count($layer->getItems()) === 0) { // zero items on layer
                $this->logger->debug("doesn't fit on layer even when empty, skipping for good");
                continue;
            } elseif ($widthLeft > 0 && count($this->items) > 0) { // skip for now, move on to the next item
                $this->logger->debug("doesn't fit, skipping for now");
                $this->skippedItems->insert($itemToPack);
            } elseif ($x > 0 && $lengthLeft >= min($itemToPack->getWidth(), $itemToPack->getLength(), $itemToPack->getDepth())) {
                $this->logger->debug('No more fit in width wise, resetting for new row');
                $widthLeft += $rowWidth;
                $lengthLeft -= $rowLength;
                $y += $rowLength;
                $x = $rowWidth = $rowLength = 0;
                $this->rebuildItemList($itemToPack);
                $prevItem = null;
                continue;
            } else {
                $this->logger->debug('no items fit, so starting next vertical layer');
                $this->rebuildItemList($itemToPack);

                return;
            }
        }
    }

    /**
     * During packing, it is quite possible that layers have been created that aren't physically stable
     * i.e. they overhang the ones below.
     *
     * This function reorders them so that the ones with the greatest surface area are placed at the bottom
     */
    public function stabiliseLayers()
    {
        $stabiliser = new LayerStabiliser();
        $this->layers = $stabiliser->stabilise($this->layers);
    }

    /**
     * @param Item            $itemToPack
     * @param PackedItem|null $prevItem
     * @param ItemList        $nextItems
     * @param bool            $isLastItem
     * @param int             $maxWidth
     * @param int             $maxLength
     * @param int             $maxDepth
     *
     * @return OrientatedItem|null
     */
    protected function getOrientationForItem(
        Item $itemToPack,
        PackedItem $prevItem = null,
        ItemList $nextItems,
        $isLastItem,
        $maxWidth,
        $maxLength,
        $maxDepth
    ) {
        $this->logger->debug(
            "evaluating item {$itemToPack->getDescription()} for fit",
            [
                'item' => $itemToPack,
                'space' => [
                    'maxWidth' => $maxWidth,
                    'maxLength' => $maxLength,
                    'maxDepth' => $maxDepth,
                ],
            ]
        );

        $prevOrientatedItem = $prevItem ? $prevItem->toOrientatedItem() : null;

        $orientatedItemFactory = new OrientatedItemFactory($this->box);
        $orientatedItemFactory->setLogger($this->logger);
        $orientatedItemDecision = $orientatedItemFactory->getBestOrientation($itemToPack, $prevOrientatedItem, $nextItems, $isLastItem, $maxWidth, $maxLength, $maxDepth);

        return $orientatedItemDecision;
    }

    /**
     * Figure out if we can stack the next item vertically on top of this rather than side by side
     * Used when we've packed a tall item, and have just put a shorter one next to it.
     *
     * @param PackedLayer     $layer
     * @param PackedItem|null $prevItem
     * @param ItemList        $nextItems
     * @param int             $maxWidth
     * @param int             $maxLength
     * @param int             $maxDepth
     * @param int             $x
     * @param int             $y
     * @param int             $z
     */
    protected function tryAndStackItemsIntoSpace(
        PackedLayer $layer,
        PackedItem $prevItem = null,
        ItemList $nextItems,
        $maxWidth,
        $maxLength,
        $maxDepth,
        $x,
        $y,
        $z
    ) {
        while (count($this->items) > 0 && $this->checkNonDimensionalConstraints($this->items->top())) {
            $stackedItem = $this->getOrientationForItem(
                $this->items->top(),
                $prevItem,
                $nextItems,
                $this->items->count() === 1,
                $maxWidth,
                $maxLength,
                $maxDepth
            );
            if ($stackedItem) {
                $this->remainingWeight -= $this->items->top()->getWeight();
                $layer->insert(PackedItem::fromOrientatedItem($stackedItem, $x, $y, $z));
                $this->items->extract();
                $maxDepth -= $stackedItem->getDepth();
                $z += $stackedItem->getDepth();
            } else {
                break;
            }
        }
    }

    /**
     * Check item generally fits into box.
     *
     * @param Item $itemToPack
     *
     * @return bool
     */
    protected function checkConstraints(
        Item $itemToPack
    ) {
        return $this->checkNonDimensionalConstraints($itemToPack) &&
               $this->checkDimensionalConstraints($itemToPack);
    }

    /**
     * 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).
     *
     * @param Item $itemToPack
     *
     * @return bool
     */
    protected function checkNonDimensionalConstraints(Item $itemToPack)
    {
        $weightOK = $itemToPack->getWeight() <= $this->remainingWeight;

        if ($itemToPack instanceof ConstrainedItem) {
            return $weightOK && $itemToPack->canBePackedInBox($this->getPackedItemList()->asItemList(), $this->box);
        }

        return $weightOK;
    }

    /**
     * Check the item physically fits in the box (at all).
     *
     * @param Item $itemToPack
     *
     * @return bool
     */
    protected function checkDimensionalConstraints(Item $itemToPack)
    {
        $orientatedItemFactory = new OrientatedItemFactory($this->box);
        $orientatedItemFactory->setLogger($this->logger);

        return (bool) $orientatedItemFactory->getPossibleOrientationsInEmptyBox($itemToPack);
    }

    /**
     * Reintegrate skipped items into main list.
     *
     * @param Item|null $currentItem item from current iteration
     */
    protected function rebuildItemList(Item $currentItem = null)
    {
        if (count($this->items) === 0) {
            $this->items = $this->skippedItems;
            $this->skippedItems = new ItemList();
        }

        if ($currentItem instanceof Item) {
            $this->items->insert($currentItem);
        }
    }

    /**
     * Swap back width/length of the packed items to match orientation of the box if needed.
     */
    protected function rotateLayersNinetyDegrees()
    {
        foreach ($this->layers as $i => $originalLayer) {
            $newLayer = new PackedLayer();
            foreach ($originalLayer->getItems() as $item) {
                $packedItem = new PackedItem($item->getItem(), $item->getY(), $item->getX(), $item->getZ(), $item->getLength(), $item->getWidth(), $item->getDepth());
                $newLayer->insert($packedItem);
            }
            $this->layers[$i] = $newLayer;
        }
    }

    /**
     * Are there items left to pack?
     *
     * @return bool
     */
    protected function hasItemsLeftToPack()
    {
        return count($this->skippedItems) + count($this->items) === 0;
    }

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

        return $packedItemList;
    }

    /**
     * Return the current packed depth.
     *
     * @return int
     */
    protected function getCurrentPackedDepth()
    {
        $depth = 0;
        foreach ($this->layers as $layer) {
            $depth += $layer->getDepth();
        }

        return $depth;
    }
}


1		<?php
2		/**
3		* Box packing (3D bin packing, knapsack problem).
4		*
5		* @author Doug Wright
6		*/
7
8		namespace DVDoug\BoxPacker;
9
10		use Psr\Log\LoggerAwareInterface;
11		use Psr\Log\LoggerAwareTrait;
12		use Psr\Log\NullLogger;
13
14		/**
15		* Actual packer.
16		*
17		* @author Doug Wright
18		*/
19		class VolumePacker implements LoggerAwareInterface
20		{
21		use LoggerAwareTrait;
22
23		/**
24		* Box to pack items into.
25		*
26		* @var Box
27		*/
28		protected $box;
29
30		/**
31		* @var int
32		*/
33		protected $boxWidth;
34
35		/**
36		* @var int
37		*/
38		protected $boxLength;
39
40		/**
41		* List of items to be packed.
42		*
43		* @var ItemList
44		*/
45		protected $items;
46
47		/**
48		* List of items temporarily skipped to be packed.
49		*
50		* @var ItemList
51		*/
52		protected $skippedItems;
53
54		/**
55		* Remaining weight capacity of the box.
56		*
57		* @var int
58		*/
59		protected $remainingWeight;
60
61		/**
62		* Whether the box was rotated for packing.
63		*
64		* @var bool
65		*/
66		protected $boxRotated = false;
67
68		/**
69		* @var PackedLayer[]
70		*/
71		protected $layers = [];
72
73		/**
74		* Constructor.
75		*
76		* @param Box $box
77		* @param ItemList $items
78		*/
79	30	public function __construct(Box $box, ItemList $items)
80		{
81	30	$this->box = $box;
82	30	$this->items = $items;
83
84	30	$this->boxWidth = max($this->box->getInnerWidth(), $this->box->getInnerLength());
85	30	$this->boxLength = min($this->box->getInnerWidth(), $this->box->getInnerLength());
86	30	$this->remainingWeight = $this->box->getMaxWeight() - $this->box->getEmptyWeight();
87	30	$this->skippedItems = new ItemList();
88	30	$this->logger = new NullLogger();
89
90		// we may have just rotated the box for packing purposes, record if we did
91	30	if ($this->box->getInnerWidth() !== $this->boxWidth \|\| $this->box->getInnerLength() !== $this->boxLength) {
92	9	$this->boxRotated = true;
93		}
94	30	}
95
96		/**
97		* Pack as many items as possible into specific given box.
98		*
99		* @return PackedBox packed box
100		*/
101	30	public function pack()
102		{
103	30	$this->logger->debug("[EVALUATING BOX] {$this->box->getReference()}");
104
105	30	while (count($this->items) > 0) {
106	30	$layerStartDepth = $this->getCurrentPackedDepth();
107	30	$this->packLayer($layerStartDepth, $this->boxWidth, $this->boxLength, $this->box->getInnerDepth() - $layerStartDepth);
108		}
109
110	30	if ($this->boxRotated) {
111	9	$this->rotateLayersNinetyDegrees();
112		}
113
114	30	$this->stabiliseLayers();
115
116	30	$this->logger->debug('done with this box');
117
118	30	return PackedBox::fromPackedItemList($this->box, $this->getPackedItemList());
119		}
120
121		/**
122		* Pack items into an individual vertical layer.
123		*
124		* @param int $startDepth
125		* @param int $widthLeft
126		* @param int $lengthLeft
127		* @param int $depthLeft
128		*/
129	30	protected function packLayer($startDepth, $widthLeft, $lengthLeft, $depthLeft)
130		{
131	30	$this->layers[] = $layer = new PackedLayer();
132	30	$prevItem = null;
133	30	$x = $y = $rowWidth = $rowLength = $layerDepth = 0;
134
135	30	while (count($this->items) > 0) {
136	30	$itemToPack = $this->items->extract();
137
138		//skip items that are simply too heavy or too large
139	30	if (!$this->checkConstraints($itemToPack)) {
140	6	$this->rebuildItemList();
141	6	continue;
142		}
143
144	30	$orientatedItem = $this->getOrientationForItem($itemToPack, $prevItem, $this->items, $this->hasItemsLeftToPack(), $widthLeft, $lengthLeft, $depthLeft);
145
146	30	if ($orientatedItem instanceof OrientatedItem) {
147	30	$packedItem = PackedItem::fromOrientatedItem($orientatedItem, $x, $y, $startDepth);
148	30	$layer->insert($packedItem);
149	30	$this->remainingWeight -= $orientatedItem->getItem()->getWeight();
150	30	$widthLeft -= $orientatedItem->getWidth();
151
152	30	$rowWidth += $orientatedItem->getWidth();
153	30	$rowLength = max($rowLength, $orientatedItem->getLength());
154	30	$layerDepth = max($layerDepth, $orientatedItem->getDepth());
155
156		//allow items to be stacked in place within the same footprint up to current layer depth
157	30	$stackableDepth = $layerDepth - $orientatedItem->getDepth();
158	30	$this->tryAndStackItemsIntoSpace($layer, $prevItem, $this->items, $orientatedItem->getWidth(), $orientatedItem->getLength(), $stackableDepth, $x, $y, $startDepth + $orientatedItem->getDepth());
159	30	$x += $orientatedItem->getWidth();
160
161	30	$prevItem = $packedItem;
162	30	$this->rebuildItemList();
163	21	} elseif (count($layer->getItems()) === 0) { // zero items on layer
164	1	$this->logger->debug("doesn't fit on layer even when empty, skipping for good");
165	1	continue;
166	21	} elseif ($widthLeft > 0 && count($this->items) > 0) { // skip for now, move on to the next item
167	16	$this->logger->debug("doesn't fit, skipping for now");
168	16	$this->skippedItems->insert($itemToPack);
169	21	} elseif ($x > 0 && $lengthLeft >= min($itemToPack->getWidth(), $itemToPack->getLength(), $itemToPack->getDepth())) {
170	21	$this->logger->debug('No more fit in width wise, resetting for new row');
171	21	$widthLeft += $rowWidth;
172	21	$lengthLeft -= $rowLength;
173	21	$y += $rowLength;
174	21	$x = $rowWidth = $rowLength = 0;
175	21	$this->rebuildItemList($itemToPack);
176	21	$prevItem = null;
177	21	continue;
178		} else {
179	13	$this->logger->debug('no items fit, so starting next vertical layer');
180	13	$this->rebuildItemList($itemToPack);
181
182	13	return;
183		}
184		}
185	30	}
186
187		/**
188		* During packing, it is quite possible that layers have been created that aren't physically stable
189		* i.e. they overhang the ones below.
190		*
191		* This function reorders them so that the ones with the greatest surface area are placed at the bottom
192		*/
193	30	public function stabiliseLayers()
194		{
195	30	$stabiliser = new LayerStabiliser();
196	30	$this->layers = $stabiliser->stabilise($this->layers);
197	30	}
198
199		/**
200		* @param Item $itemToPack
201		* @param PackedItem\|null $prevItem
202		* @param ItemList $nextItems
203		* @param bool $isLastItem
204		* @param int $maxWidth
205		* @param int $maxLength
206		* @param int $maxDepth
207		*
208		* @return OrientatedItem\|null
209		*/
210	30	protected function getOrientationForItem(
211		Item $itemToPack,
212		PackedItem $prevItem = null,
213		ItemList $nextItems,
214		$isLastItem,
215		$maxWidth,
216		$maxLength,
217		$maxDepth
218		) {
219	30	$this->logger->debug(
220	30	"evaluating item {$itemToPack->getDescription()} for fit",
221		[
222	30	'item' => $itemToPack,
223		'space' => [
224	30	'maxWidth' => $maxWidth,
225	30	'maxLength' => $maxLength,
226	30	'maxDepth' => $maxDepth,
227		],
228		]
229		);
230
231	30	$prevOrientatedItem = $prevItem ? $prevItem->toOrientatedItem() : null;
232
233	30	$orientatedItemFactory = new OrientatedItemFactory($this->box);
234	30	$orientatedItemFactory->setLogger($this->logger);
235	30	$orientatedItemDecision = $orientatedItemFactory->getBestOrientation($itemToPack, $prevOrientatedItem, $nextItems, $isLastItem, $maxWidth, $maxLength, $maxDepth);
236
237	30	return $orientatedItemDecision;
238		}
239
240		/**
241		* Figure out if we can stack the next item vertically on top of this rather than side by side
242		* Used when we've packed a tall item, and have just put a shorter one next to it.
243		*
244		* @param PackedLayer $layer
245		* @param PackedItem\|null $prevItem
246		* @param ItemList $nextItems
247		* @param int $maxWidth
248		* @param int $maxLength
249		* @param int $maxDepth
250		* @param int $x
251		* @param int $y
252		* @param int $z
253		*/
254	30	protected function tryAndStackItemsIntoSpace(
255		PackedLayer $layer,
256		PackedItem $prevItem = null,
257		ItemList $nextItems,
258		$maxWidth,
259		$maxLength,
260		$maxDepth,
261		$x,
262		$y,
263		$z
264		) {
265	30	while (count($this->items) > 0 && $this->checkNonDimensionalConstraints($this->items->top())) {
266	29	$stackedItem = $this->getOrientationForItem(
267	29	$this->items->top(),
268	29	$prevItem,
269	29	$nextItems,
270	29	$this->items->count() === 1,
271	29	$maxWidth,
272	29	$maxLength,
273	29	$maxDepth
274		);
275	29	if ($stackedItem) {
276	2	$this->remainingWeight -= $this->items->top()->getWeight();
277	2	$layer->insert(PackedItem::fromOrientatedItem($stackedItem, $x, $y, $z));
278	2	$this->items->extract();
279	2	$maxDepth -= $stackedItem->getDepth();
280	2	$z += $stackedItem->getDepth();
281		} else {
282	29	break;
283		}
284		}
285	30	}
286
287		/**
288		* Check item generally fits into box.
289		*
290		* @param Item $itemToPack
291		*
292		* @return bool
293		*/
294	30	protected function checkConstraints(
295		Item $itemToPack
296		) {
297	30	return $this->checkNonDimensionalConstraints($itemToPack) &&
298	30	$this->checkDimensionalConstraints($itemToPack);
299		}
300
301		/**
302		* As well as purely dimensional constraints, there are other constraints that need to be met
303		* e.g. weight limits or item-specific restrictions (e.g. max <x> batteries per box).
304		*
305		* @param Item $itemToPack
306		*
307		* @return bool
308		*/
309	30	protected function checkNonDimensionalConstraints(Item $itemToPack)
310		{
311	30	$weightOK = $itemToPack->getWeight() <= $this->remainingWeight;
312
313	30	if ($itemToPack instanceof ConstrainedItem) {
314	1	return $weightOK && $itemToPack->canBePackedInBox($this->getPackedItemList()->asItemList(), $this->box);
315		}
316
317	30	return $weightOK;
318		}
319
320		/**
321		* Check the item physically fits in the box (at all).
322		*
323		* @param Item $itemToPack
324		*
325		* @return bool
326		*/
327	30	protected function checkDimensionalConstraints(Item $itemToPack)
328		{
329	30	$orientatedItemFactory = new OrientatedItemFactory($this->box);
330	30	$orientatedItemFactory->setLogger($this->logger);
331
332	30	return (bool) $orientatedItemFactory->getPossibleOrientationsInEmptyBox($itemToPack);
333		}
334
335		/**
336		* Reintegrate skipped items into main list.
337		*
338		* @param Item\|null $currentItem item from current iteration
339		*/
340	30	protected function rebuildItemList(Item $currentItem = null)
341		{
342	30	if (count($this->items) === 0) {
343	30	$this->items = $this->skippedItems;
344	30	$this->skippedItems = new ItemList();
345		}
346
347	30	if ($currentItem instanceof Item) {
348	21	$this->items->insert($currentItem);
349		}
350	30	}
351
352		/**
353		* Swap back width/length of the packed items to match orientation of the box if needed.
354		*/
355	9	protected function rotateLayersNinetyDegrees()
356		{
357	9	foreach ($this->layers as $i => $originalLayer) {
358	9	$newLayer = new PackedLayer();
359	9	foreach ($originalLayer->getItems() as $item) {
360	9	$packedItem = new PackedItem($item->getItem(), $item->getY(), $item->getX(), $item->getZ(), $item->getLength(), $item->getWidth(), $item->getDepth());
361	9	$newLayer->insert($packedItem);
362		}
363	9	$this->layers[$i] = $newLayer;
364		}
365	9	}
366
367		/**
368		* Are there items left to pack?
369		*
370		* @return bool
371		*/
372	30	protected function hasItemsLeftToPack()
373		{
374	30	return count($this->skippedItems) + count($this->items) === 0;
375		}
376
377		/**
378		* Generate a single list of items packed.
379		*
380		* @return PackedItemList
381		*/
382	30	protected function getPackedItemList()
383		{
384	30	$packedItemList = new PackedItemList();
385	30	foreach ($this->layers as $layer) {
386	30	foreach ($layer->getItems() as $packedItem) {
387	30	$packedItemList->insert($packedItem);
388		}
389		}
390
391	30	return $packedItemList;
392		}
393
394		/**
395		* Return the current packed depth.
396		*
397		* @return int
398		*/
399	30	protected function getCurrentPackedDepth()
400		{
401	30	$depth = 0;
402	30	foreach ($this->layers as $layer) {
403	13	$depth += $layer->getDepth();
404		}
405
406	30	return $depth;
407		}
408		}
409

dvdoug / BoxPacker

Push — 2.x-dev ( 794087...7794d8 )

VolumePacker::tryAndStackItemsIntoSpace() A

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