x; } public function getY() : float { return $this->y; } /** * @return self */ public function translate(float $x, float $y) : OperationInterface { return new self($this->x + $x, $this->y + $y); } /** * @return self */ public function rotate(int $degrees) : OperationInterface { $radians = deg2rad($degrees); $sin = sin($radians); $cos = cos($radians); $xr = $this->x * $cos - $this->y * $sin; $yr = $this->x * $sin + $this->y * $cos; return new self($xr, $yr); } }