let transd delta teta =
	delta -. 1.5

let transt delta teta =
	teta -. 1.

let cartesian_of_polar (radius, teta) =
	radius *. cos(teta), radius *. sin(teta)

let rec draw delta teta =
	let x, y = cartesian_of_polar (delta, teta) in
	let x', y' = truncate x, truncate y in

	let delta', teta' = transd delta teta, transt delta teta in
	if delta <= 0.0
		then ()
		else begin
			Graphics.rlineto x' y';
			draw delta' teta';
		end

let rec halt() =
	try ignore(Graphics.wait_next_event []); halt() with
		Graphics.Graphic_failure _ ->
			Printf.printf "Saindo..\n%!"

let _ =
	Graphics.open_graph "";
	Graphics.moveto (Graphics.size_x() / 2) (Graphics.size_y() / 2); 
	draw 100. 45.0;
	Printf.printf "Passou! :)\n%!";
	halt()