public function drawCircle($x, $y, $z, $radius, $motion = 'G2', $plane = 'G17')
	{			
		if ($plane == 'G17') {
			
			$of = $x - $radius;
			
			$this->setCode("(circle)");
			$this->setCode("G0 X{$of} Y{$y}");
			$this->setCode("G1 Z{$z} (axis spindle start point)");
			
			// TODO Tool size  ...
			// TODO Cutting spindle movement ...
			
			$this->setCode("{$plane} {$motion} X{$of} Y{$y} I{$radius} J0.00 Z{$z}");
			$this->setCode("G0 Z{$this->spindleAxisStartPosition} (axis spindle start position)");
			$this->setCode("(/circle)\n");
		}
		
		if ($plane == 'G18') {
			// G18 is disabled
			return;
		}
		
		if ($plane == 'G19') {
			// G19 is disabled
			return;
		}
		
		return $this;
	}