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<?php |
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namespace Barryvanveen\CCA; |
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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 = $coordinate; |
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} |
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/** |
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* @return Coordinate[] |
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* |
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* @throws \Barryvanveen\CCA\Exceptions\InvalidNeighborhoodTypeException |
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*/ |
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public function getNeighbors(): array |
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{ |
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$neighborhoodType = $this->config->neighborhoodType(); |
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$method = 'get'.ucfirst($neighborhoodType).'Neighbors'; |
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return $this->{$method}($this->coordinate); |
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} |
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/** |
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* Retrieve an array of Moore neighborhood neighbors for the given coordinate. |
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* |
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* @param Coordinate $coordinate |
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* |
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* @return Coordinate[] |
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*/ |
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protected function getMooreNeighbors(Coordinate $coordinate): array |
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{ |
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$neigbors = []; |
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$size = abs($this->config->neighborhoodSize()); |
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for ($rowOffset = -1 * $size; $rowOffset <= $size; $rowOffset++) { |
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for ($columnOffset = -1 * $size; $columnOffset <= $size; $columnOffset++) { |
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if ($rowOffset === 0 && $columnOffset === 0) { |
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continue; |
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} |
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$neigbors[] = new Coordinate( |
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$this->wrapRow($coordinate->row(), $rowOffset), |
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$this->wrapColumn($coordinate->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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return $neigbors; |
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} |
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/** |
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* Retrieve an array of Neumann neighborhood neighbors for the given coordinate. |
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* |
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* @param Coordinate $coordinate |
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* |
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* @return Coordinate[] |
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*/ |
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protected function getNeumannNeighbors(Coordinate $coordinate): array |
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{ |
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$neigbors = []; |
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$size = abs($this->config->neighborhoodSize()); |
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for ($rowOffset = -1 * $size; $rowOffset <= $size; $rowOffset++) { |
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for ($columnOffset = -1 * $size; $columnOffset <= $size; $columnOffset++) { |
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if ($rowOffset === 0 && $columnOffset === 0) { |
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continue; |
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} |
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if ((abs($rowOffset) + abs($columnOffset)) > $this->config->neighborhoodSize()) { |
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continue; |
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} |
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$neigbors[] = new Coordinate( |
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$this->wrapRow($coordinate->row(), $rowOffset), |
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$this->wrapColumn($coordinate->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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return $neigbors; |
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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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