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<?php |
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namespace GGGGino\WarehousePath\Breadcrumb; |
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use GGGGino\WarehousePath\Entity\Place; |
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use GGGGino\WarehousePath\PlacesCollector; |
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class BreadthFirstBreadcrumb implements BreadcrumbInterface |
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{ |
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/** |
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* Callback useful if you want to modifiy temporarily some wharehouse configuration |
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* es. |
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* function(Place $startPlace, array $placesType) {}; |
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* |
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* @var callable|null |
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*/ |
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private $onPreCreateBreadcumb = null; |
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/** |
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* Callback useful if you want to customize the mapping of this wharehouse. |
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* Called in every loops |
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* es. |
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* function(Place $currentPlace) {}; |
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* |
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* @var callable|null |
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*/ |
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private $onWalk = null; |
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/** |
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* @var PlacesCollector |
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*/ |
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protected $placeCollector; |
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/** |
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* BreadthFirstBreadcrumb constructor. |
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* @param PlacesCollector $placeCollector |
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*/ |
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public function __construct(PlacesCollector $placeCollector) |
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{ |
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$this->placeCollector = $placeCollector; |
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} |
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/** |
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* Main algorithm to find the shortest path. |
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* |
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* @todo: nel futuro quando ci sarà un magazzino grande, spezzare il magazzino prendendo solo il quadrato contenente i vari punti |
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* |
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* @param Place $startPlace |
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* @param Place $endPlace if not null do early exit |
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*/ |
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public function createBreadcrumb(Place $startPlace, Place $endPlace = null) |
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{ |
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if ( is_callable( $this->onPreCreateBreadcumb ) ) { |
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call_user_func($this->onPreCreateBreadcumb, $startPlace, $this->placeCollector->getPlacesType()); |
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} |
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$frontier = array(); |
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array_push($frontier, $startPlace); |
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while (!empty($frontier)) { |
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/** @var Place $current */ |
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$current = array_shift($frontier); |
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if ( is_callable( $this->onWalk ) ) { |
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call_user_func($this->onWalk, $current); |
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} |
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/** @var Place $vicino */ |
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foreach ($current->getWalkableNeighbors() as $vicino) { |
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$tempCost = $current->getCurrentWeight() + $vicino->getOriginalWeight(); |
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if ($vicino->isVisited() && $tempCost < $vicino->getCurrentWeight()) { |
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$vicino->setCurrentWeight($tempCost); |
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$vicino->setWalkingCameFrom($current); |
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array_push($frontier, $vicino); |
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continue; |
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} |
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if ($vicino->isVisited()) { |
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continue; |
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} |
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$vicino->setVisited(true); |
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$vicino->increaseCurrentWeight($current->getCurrentWeight()); |
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$vicino->setWalkingCameFrom($current); |
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array_push($frontier, $vicino); |
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} |
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$current->setVisited(true); |
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} |
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} |
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/** |
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* @param callable|null $onPreCreateBreadcumb |
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* @return BreadthFirstBreadcrumb |
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*/ |
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public function setOnPreCreateBreadcumb($onPreCreateBreadcumb) |
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{ |
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$this->onPreCreateBreadcumb = $onPreCreateBreadcumb; |
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return $this; |
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} |
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/** |
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* @param callable|null $onWalk |
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* @return BreadthFirstBreadcrumb |
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*/ |
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public function setOnWalk($onWalk) |
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{ |
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$this->onWalk = $onWalk; |
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return $this; |
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} |
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} |
GGGGino /
WarehousePath
