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(*
** Author: Hongwei Xi
** Authoremail: gmhwxiATgmailDOTcom
** Start time: October, 2013
*)
(* ****** ****** *)
#define PI 3.1415926535898
(* ****** ****** *)
//
extern
fun{}
draw_line (point, point, color): void
//
extern
fun{}
draw_dragon
(
sgn: int, point, point, color, int(*level*)
) : void // end of [draw_dragon]
//
(* ****** ****** *)
implement{
} draw_line
(
p1, p2, clr
) = let
//
val () = mydraw_new_path ()
//
val () = mydraw_move_to (p1)
val () = mydraw_line_to (p2)
val () = mydraw_stroke_set_rgb (clr.r(), clr.g(), clr.b())
val () = mydraw_stroke ()
//
val () = mydraw_close_path ()
//
in
// nothing
end // end of [draw_line]
(* ****** ****** *)
implement{
} draw_dragon
(
sgn, p1, p2, clr, n
) = let
in
//
if n > 0 then let
val v0 = $M.cos(PI/4) * (p2 - p1)
val q1 = p1 + vector_rotate (v0, sgn*PI/4)
val () = draw_dragon ( 1, p1, q1, clr, n-1)
val () = draw_dragon (~1, q1, p2, clr, n-1)
in
// nothing
end else draw_line (p1, p2, clr) // end of [if]
//
end // end of [draw_dragon]
(* ****** ****** *)
(* end of [test04.dats] *)
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