VolumePacker::__construct() - Code Metrics - Inspection of "Backport packing enhancements from 3.1.0" - dvdoug/BoxPacker - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Push — 1.x-dev ( cc1b76...09423a )

by Doug

created 2018-02-25 16:25 UTC

VolumePacker::__construct() A

↳ Parent: VolumePacker

Complexity

Conditions	3
Paths	2

Size

Total Lines	14
Code Lines	9

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	10
CRAP Score	3

Importance

Changes

Metric	Value
cc	3
eloc	9
nc	2
nop	2
dl	0
loc	14
ccs	10
cts	10
cp	1
crap	3
rs	9.4285
c	0
b	0
f	0

<?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();
            $nextItem = $this->getNextItem();

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

            $orientatedItem = $this->getOrientationForItem($itemToPack, $prevItem, $nextItem, $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, $nextItem, $orientatedItem->getWidth(), $orientatedItem->getLength(), $stackableDepth, $x, $y, $startDepth + $orientatedItem->getDepth());
                $x += $orientatedItem->getWidth();

                $prevItem = $packedItem;
                $this->rebuildItemList();
            } else {
                if (count($layer->getItems()) === 0) { // zero items on layer
                    $this->logger->debug("doesn't fit on layer even when empty, skipping for good");
                    continue;
                } elseif (count($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())) {
                    $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 Item|null       $nextItem
     * @param bool            $isLastItem
     * @param int             $maxWidth
     * @param int             $maxLength
     * @param int             $maxDepth
     *
     * @return OrientatedItem|null
     */
    protected function getOrientationForItem(
        Item $itemToPack,
        PackedItem $prevItem = null,
        Item $nextItem = null,
        $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;

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

        return $orientatedItem;
    }

    /**
     * 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 Item|null       $nextItem
     * @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,
        Item $nextItem = null,
        $maxWidth,
        $maxLength,
        $maxDepth,
        $x,
        $y,
        $z
    ) {
        while (count($this->items) > 0 && $this->checkNonDimensionalConstraints($this->items->top())) {
            $stackedItem = $this->getOrientationForItem(
                $this->items->top(),
                $prevItem,
                $nextItem,
                $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)
    {
        $orientatedItemFactory = new OrientatedItemFactory($itemToPack, $this->box);
        $orientatedItemFactory->setLogger($this->logger);

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

    /**
     * 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;
    }

    /**
     * Return next item in line for packing.
     *
     * @return Item|null
     */
    protected function getNextItem()
    {
        return count($this->items) ? $this->items->top() : null;
    }

    /**
     * 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	26	public function __construct(Box $box, ItemList $items)
80		{
81	26	$this->box = $box;
82	26	$this->items = $items;
83
84	26	$this->boxWidth = max($this->box->getInnerWidth(), $this->box->getInnerLength());
85	26	$this->boxLength = min($this->box->getInnerWidth(), $this->box->getInnerLength());
86	26	$this->remainingWeight = $this->box->getMaxWeight() - $this->box->getEmptyWeight();
87	26	$this->skippedItems = new ItemList();
88	26	$this->logger = new NullLogger();
89
90		// we may have just rotated the box for packing purposes, record if we did
91	26	if ($this->box->getInnerWidth() != $this->boxWidth \|\| $this->box->getInnerLength() != $this->boxLength) {
92	7	$this->boxRotated = true;
93		}
94	26	}
95
96		/**
97		* Pack as many items as possible into specific given box.
98		*
99		* @return PackedBox packed box
100		*/
101	26	public function pack()
102		{
103	26	$this->logger->debug("[EVALUATING BOX] {$this->box->getReference()}");
104
105	26	while (count($this->items) > 0) {
106	26	$layerStartDepth = $this->getCurrentPackedDepth();
107	26	$this->packLayer($layerStartDepth, $this->boxWidth, $this->boxLength, $this->box->getInnerDepth() - $layerStartDepth);
108		}
109
110	26	if ($this->boxRotated) {
111	7	$this->rotateLayersNinetyDegrees();
112		}
113
114	26	$this->stabiliseLayers();
115
116	26	$this->logger->debug('done with this box');
117
118	26	return PackedBox::fromPackedItemList($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 $depthLeft
128		*/
129	26	protected function packLayer($startDepth, $widthLeft, $lengthLeft, $depthLeft)
130		{
131	26	$this->layers[] = $layer = new PackedLayer();
132	26	$prevItem = null;
133	26	$x = $y = $rowWidth = $rowLength = $layerDepth = 0;
134
135	26	while (count($this->items) > 0) {
136	26	$itemToPack = $this->items->extract();
137	26	$nextItem = $this->getNextItem();
138
139		//skip items that are simply too heavy or too large
140	26	if (!$this->checkConstraints($itemToPack)) {
141	6	$this->rebuildItemList();
142	6	continue;
143		}
144
145	26	$orientatedItem = $this->getOrientationForItem($itemToPack, $prevItem, $nextItem, $this->hasItemsLeftToPack(), $widthLeft, $lengthLeft, $depthLeft);
146
147	26	if ($orientatedItem instanceof OrientatedItem) {
148	26	$packedItem = PackedItem::fromOrientatedItem($orientatedItem, $x, $y, $startDepth);
149	26	$layer->insert($packedItem);
150	26	$this->remainingWeight -= $orientatedItem->getItem()->getWeight();
151	26	$widthLeft -= $orientatedItem->getWidth();
152
153	26	$rowWidth += $orientatedItem->getWidth();
154	26	$rowLength = max($rowLength, $orientatedItem->getLength());
155	26	$layerDepth = max($layerDepth, $orientatedItem->getDepth());
156
157		//allow items to be stacked in place within the same footprint up to current layer depth
158	26	$stackableDepth = $layerDepth - $orientatedItem->getDepth();
159	26	$this->tryAndStackItemsIntoSpace($layer, $prevItem, $nextItem, $orientatedItem->getWidth(), $orientatedItem->getLength(), $stackableDepth, $x, $y, $startDepth + $orientatedItem->getDepth());
160	26	$x += $orientatedItem->getWidth();
161
162	26	$prevItem = $packedItem;
163	26	$this->rebuildItemList();
164		} else {
165	20	if (count($layer->getItems()) === 0) { // zero items on layer
166	1	$this->logger->debug("doesn't fit on layer even when empty, skipping for good");
167	1	continue;
168	20	} elseif (count($this->items) > 0) { // skip for now, move on to the next item
169	18	$this->logger->debug("doesn't fit, skipping for now");
170	18	$this->skippedItems->insert($itemToPack);
171	20	} elseif ($x > 0 && $lengthLeft >= min($itemToPack->getWidth(), $itemToPack->getLength())) {
172	20	$this->logger->debug('No more fit in width wise, resetting for new row');
173	20	$widthLeft += $rowWidth;
174	20	$lengthLeft -= $rowLength;
175	20	$y += $rowLength;
176	20	$x = $rowWidth = $rowLength = 0;
177	20	$this->rebuildItemList($itemToPack);
178	20	$prevItem = null;
179	20	continue;
180		} else {
181	13	$this->logger->debug('no items fit, so starting next vertical layer');
182	13	$this->rebuildItemList($itemToPack);
183
184	13	return;
185		}
186		}
187		}
188	26	}
189
190		/**
191		* During packing, it is quite possible that layers have been created that aren't physically stable
192		* i.e. they overhang the ones below.
193		*
194		* This function reorders them so that the ones with the greatest surface area are placed at the bottom
195		*/
196	26	public function stabiliseLayers()
197		{
198	26	$stabiliser = new LayerStabiliser();
199	26	$this->layers = $stabiliser->stabilise($this->layers);
200	26	}
201
202		/**
203		* @param Item $itemToPack
204		* @param PackedItem\|null $prevItem
205		* @param Item\|null $nextItem
206		* @param bool $isLastItem
207		* @param int $maxWidth
208		* @param int $maxLength
209		* @param int $maxDepth
210		*
211		* @return OrientatedItem\|null
212		*/
213	26	protected function getOrientationForItem(
214		Item $itemToPack,
215		PackedItem $prevItem = null,
216		Item $nextItem = null,
217		$isLastItem,
218		$maxWidth,
219		$maxLength,
220		$maxDepth
221		) {
222	26	$this->logger->debug(
223	26	"evaluating item {$itemToPack->getDescription()} for fit",
224		[
225	26	'item' => $itemToPack,
226		'space' => [
227	26	'maxWidth' => $maxWidth,
228	26	'maxLength' => $maxLength,
229	26	'maxDepth' => $maxDepth,
230		],
231		]
232		);
233
234	26	$prevOrientatedItem = $prevItem ? $prevItem->toOrientatedItem() : null;
235
236	26	$orientatedItemFactory = new OrientatedItemFactory($itemToPack, $this->box);
237	26	$orientatedItemFactory->setLogger($this->logger);
238	26	$orientatedItem = $orientatedItemFactory->getBestOrientation($prevOrientatedItem, $nextItem, $isLastItem, $maxWidth, $maxLength, $maxDepth);
239
240	26	return $orientatedItem;
241		}
242
243		/**
244		* Figure out if we can stack the next item vertically on top of this rather than side by side
245		* Used when we've packed a tall item, and have just put a shorter one next to it.
246		*
247		* @param PackedLayer $layer
248		* @param PackedItem\|null $prevItem
249		* @param Item\|null $nextItem
250		* @param int $maxWidth
251		* @param int $maxLength
252		* @param int $maxDepth
253		* @param int $x
254		* @param int $y
255		* @param int $z
256		*/
257	26	protected function tryAndStackItemsIntoSpace(
258		PackedLayer $layer,
259		PackedItem $prevItem = null,
260		Item $nextItem = null,
261		$maxWidth,
262		$maxLength,
263		$maxDepth,
264		$x,
265		$y,
266		$z
267		) {
268	26	while (count($this->items) > 0 && $this->checkNonDimensionalConstraints($this->items->top())) {
269	26	$stackedItem = $this->getOrientationForItem(
270	26	$this->items->top(),
271	26	$prevItem,
272	26	$nextItem,
273	26	$this->items->count() === 1,
274	26	$maxWidth,
275	26	$maxLength,
276	26	$maxDepth
277		);
278	26	if ($stackedItem) {
279	2	$this->remainingWeight -= $this->items->top()->getWeight();
280	2	$layer->insert(PackedItem::fromOrientatedItem($stackedItem, $x, $y, $z));
281	2	$this->items->extract();
282	2	$maxDepth -= $stackedItem->getDepth();
283	2	$z += $stackedItem->getDepth();
284		} else {
285	26	break;
286		}
287		}
288	26	}
289
290		/**
291		* Check item generally fits into box.
292		*
293		* @param Item $itemToPack
294		*
295		* @return bool
296		*/
297	26	protected function checkConstraints(
298		Item $itemToPack
299		) {
300	26	return $this->checkNonDimensionalConstraints($itemToPack) &&
301	26	$this->checkDimensionalConstraints($itemToPack);
302		}
303
304		/**
305		* As well as purely dimensional constraints, there are other constraints that need to be met
306		* e.g. weight limits or item-specific restrictions (e.g. max <x> batteries per box).
307		*
308		* @param Item $itemToPack
309		*
310		* @return bool
311		*/
312	26	protected function checkNonDimensionalConstraints(Item $itemToPack)
313		{
314	26	$weightOK = $itemToPack->getWeight() <= $this->remainingWeight;
315
316	26	if ($itemToPack instanceof ConstrainedItem) {
317	1	return $weightOK && $itemToPack->canBePackedInBox($this->getPackedItemList()->asItemList(), $this->box);
318		}
319
320	26	return $weightOK;
321		}
322
323		/**
324		* Check the item physically fits in the box (at all).
325		*
326		* @param Item $itemToPack
327		*
328		* @return bool
329		*/
330	26	protected function checkDimensionalConstraints(Item $itemToPack)
331		{
332	26	$orientatedItemFactory = new OrientatedItemFactory($itemToPack, $this->box);
333	26	$orientatedItemFactory->setLogger($this->logger);
334
335	26	return (bool) $orientatedItemFactory->getPossibleOrientationsInEmptyBox();
336		}
337
338		/**
339		* Reintegrate skipped items into main list.
340		*
341		* @param Item\|null $currentItem item from current iteration
342		*/
343	26	protected function rebuildItemList(Item $currentItem = null)
344		{
345	26	if (count($this->items) === 0) {
346	26	$this->items = $this->skippedItems;
347	26	$this->skippedItems = new ItemList();
348		}
349
350	26	if ($currentItem instanceof Item) {
351	20	$this->items->insert($currentItem);
352		}
353	26	}
354
355		/**
356		* Swap back width/length of the packed items to match orientation of the box if needed.
357		*/
358	7	protected function rotateLayersNinetyDegrees()
359		{
360	7	foreach ($this->layers as $i => $originalLayer) {
361	7	$newLayer = new PackedLayer();
362	7	foreach ($originalLayer->getItems() as $item) {
363	7	$packedItem = new PackedItem($item->getItem(), $item->getY(), $item->getX(), $item->getZ(), $item->getLength(), $item->getWidth(), $item->getDepth());
364	7	$newLayer->insert($packedItem);
365		}
366	7	$this->layers[$i] = $newLayer;
367		}
368	7	}
369
370		/**
371		* Are there items left to pack?
372		*
373		* @return bool
374		*/
375	26	protected function hasItemsLeftToPack()
376		{
377	26	return count($this->skippedItems) + count($this->items) === 0;
378		}
379
380		/**
381		* Return next item in line for packing.
382		*
383		* @return Item\|null
384		*/
385	26	protected function getNextItem()
386		{
387	26	return count($this->items) ? $this->items->top() : null;
388		}
389
390		/**
391		* Generate a single list of items packed.
392		*
393		* @return PackedItemList
394		*/
395	26	protected function getPackedItemList()
396		{
397	26	$packedItemList = new PackedItemList();
398	26	foreach ($this->layers as $layer) {
399	26	foreach ($layer->getItems() as $packedItem) {
400	26	$packedItemList->insert($packedItem);
401		}
402		}
403
404	26	return $packedItemList;
405		}
406
407		/**
408		* Return the current packed depth.
409		*
410		* @return int
411		*/
412	26	protected function getCurrentPackedDepth()
413		{
414	26	$depth = 0;
415	26	foreach ($this->layers as $layer) {
416	13	$depth += $layer->getDepth();
417		}
418
419	26	return $depth;
420		}
421		}
422

dvdoug / BoxPacker

Push — 1.x-dev ( cc1b76...09423a )

VolumePacker::__construct() A

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