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<?php |
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declare(strict_types=1); |
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namespace Barryvanveen\CCA; |
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use Barryvanveen\CCA\Config\NeighborhoodOptions; |
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class Neighborhood |
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{ |
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/** @var Config */ |
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protected $config; |
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/** @var Coordinate */ |
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protected $coordinate; |
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/** |
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* Neighborhood constructor. |
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* |
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* @param Config $config |
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* @param Coordinate $coordinate |
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*/ |
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public function __construct(Config $config, Coordinate $coordinate) |
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{ |
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$this->config = $config; |
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$this->coordinate = $coordinate; |
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} |
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/** |
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* @return Coordinate[] |
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*/ |
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public function getNeighbors(): array |
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{ |
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$neighbors = []; |
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$offsets = range(-1 * $this->config->neighborhoodSize(), $this->config->neighborhoodSize()); |
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foreach ($offsets as $rowOffset) { |
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foreach ($offsets as $columnOffset) { |
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if (!$this->isValidNeighbor($rowOffset, $columnOffset)) { |
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continue; |
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} |
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$neighbors[] = $this->createCoordinateFromOffsets($this->coordinate, $rowOffset, $columnOffset); |
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} |
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} |
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return $neighbors; |
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} |
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protected function createCoordinateFromOffsets(Coordinate $current, int $rowOffset, int $columnOffset): Coordinate |
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{ |
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return new Coordinate( |
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$this->wrapRow($current->row(), $rowOffset), |
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$this->wrapColumn($current->column(), $columnOffset), |
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$this->config->columns() |
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); |
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} |
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/** |
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* Determine if the offsets result in a valid neighbor. |
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* |
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* @param int $rowOffset |
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* @param int $columnOffset |
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* |
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* @return bool |
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*/ |
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protected function isValidNeighbor(int $rowOffset, int $columnOffset): bool |
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{ |
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if (abs($rowOffset) + abs($columnOffset) === 0) { |
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return false; |
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} |
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if ($this->config->neighborhoodType() === NeighborhoodOptions::NEIGHBORHOOD_TYPE_MOORE) { |
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return true; |
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} |
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if ((abs($rowOffset) + abs($columnOffset)) > $this->config->neighborhoodSize()) { |
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return false; |
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} |
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return true; |
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} |
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protected function wrapRow(int $row, int $rowOffset): int |
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{ |
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$row = $row + $rowOffset; |
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if ($row < 0) { |
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return $row + $this->config->rows(); |
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} |
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return $row % $this->config->rows(); |
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} |
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protected function wrapColumn(int $column, int $columnOffset): int |
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{ |
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$column = $column + $columnOffset; |
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if ($column < 0) { |
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return $column + $this->config->columns(); |
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} |
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return $column % $this->config->columns(); |
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} |
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} |
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barryvanveen /
php-cca
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