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<?php |
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namespace Vehsamrak\Terraformator\Entity; |
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use Doctrine\Common\Collections\ArrayCollection; |
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use Vehsamrak\Terraformator\Exception\InvalidTypeException; |
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/** |
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* @author Vehsamrak |
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*/ |
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class Map extends ArrayCollection |
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{ |
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/** |
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* {@inheritDoc} |
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*/ |
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public function __construct(array $locations = []) |
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{ |
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parent::__construct($locations); |
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} |
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/** {@inheritDoc} */ |
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public function add($element): bool |
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{ |
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if (!$element instanceof Location) { |
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throw new InvalidTypeException(); |
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} |
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return parent::add($element); |
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} |
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/** {@inheritDoc} */ |
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public function first(): ?Location |
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{ |
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$firstLocation = parent::first(); |
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if (!$firstLocation) { |
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return null; |
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} |
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return $firstLocation; |
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} |
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public function getPreviousLocations(int $x, int $y): PreviousLocationMap |
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{ |
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// filtering north, north-west, north-east and west locations by X and Y |
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$previousLocations = $this->filter( |
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function (Location $location) use ($x, $y) { |
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$westLocationX = $x - 1; |
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$westLocationY = $y; |
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$northWestLocationX = $x - 1; |
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$northWestLocationY = $y - 1; |
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$northLocationX = $x; |
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$northLocationY = $y - 1; |
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$northEastLocationX = $x + 1; |
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$northEastLocationY = $y - 1; |
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$locationX = $location->getX(); |
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$locationY = $location->getY(); |
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return ($locationX === $westLocationX && $locationY === $westLocationY) || |
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($locationX === $northWestLocationX && $locationY === $northWestLocationY) || |
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($locationX === $northLocationX && $locationY === $northLocationY) || |
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($locationX === $northEastLocationX && $locationY === $northEastLocationY); |
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} |
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); |
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return new PreviousLocationMap($previousLocations->getValues()); |
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} |
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} |
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