public function __construct()
 {
     parent::__construct(3);
     $this->setDescription("draw_vertical_line x:int y1:int y2:int –-- Draws a straight vertical line on the canvas");
 }
 public function __construct()
 {
     parent::__construct(3);
     $this->setDescription("draw_horizontal_line y:int x1:int x2:int –-- Draws a straight horizontal line on the canvas");
 }
 public function __construct()
 {
     parent::__construct(4);
     $this->setDescription("draw_rectangle x1:int y1:int x2:int y2:int –-- Draws a rectangle, where (x1,y1) is the top right, and (x2,y2) the bottom right corner of the rectangle");
 }