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<?php |
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namespace Kata\Rover\Domain\Model; |
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class Position |
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{ |
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private $col; |
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private $row; |
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public function __construct(int $a_col, int $a_row) |
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{ |
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$this->col = $a_col; |
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$this->row = $a_row; |
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} |
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public static function create(int $a_col, int $a_row): Position |
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{ |
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self::validate($a_col, $a_row); |
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return new self($a_col, $a_row); |
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} |
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private static function validate(int $x, int $y): void |
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{ |
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if ($x < 0 || $y < 0) |
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{ |
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throw new \InvalidArgumentException('Invalid coordinates'); |
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} |
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} |
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public function col(): int |
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{ |
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return $this->col; |
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} |
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public function row(): int |
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{ |
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return $this->row; |
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} |
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public function equals(Position $a_position): bool |
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{ |
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return $this->col === $a_position->col && $this->row === $a_position->row; |
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} |
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public function moveForward(Orientation $orientation): Position |
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{ |
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if ($orientation->isNorth()) |
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{ |
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return self::create($this->col, $this->row + 1); |
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} |
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if ($orientation->isSouth()) |
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{ |
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return self::create($this->col, $this->row - 1); |
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} |
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if ($orientation->isEast()) |
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{ |
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return self::create($this->col + 1, $this->row); |
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} |
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if ($orientation->isWest()) |
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{ |
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return self::create($this->col - 1, $this->row); |
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} |
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} |
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public function moveBackward(Orientation $orientation): Position |
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{ |
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if ($orientation->isNorth()) |
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{ |
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return self::create($this->col, $this->row - 1); |
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} |
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if ($orientation->isSouth()) |
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{ |
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return self::create($this->col, $this->row + 1); |
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} |
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if ($orientation->isEast()) |
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{ |
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return self::create($this->col - 1, $this->row); |
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} |
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if ($orientation->isWest()) |
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{ |
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return self::create($this->col + 1, $this->row); |
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} |
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} |
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} |
uvinum /
php-kata-env
