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type picture = Picture of float * float * float * float * pic_object list
(* xsize, ysize, xorigin, yorigin, picture objects *)
and point = float * float
(* x, y *)
and pic_object = Line of point * int * int * float * option list
(* xpos, ypos, xslope, yslope, length, option list *)
| Circle of point * float * option list
(* xpos, ypos, diameter, option list *)
| Oval of point * float * float * option list
(* xpos, ypos, length, height, option list *)
| Text of point * string * option list
(* xpos, ypos, text, option list *)
| Curve of point * point * point * option list
(* first point, control point, last point, option list *)
| SubPicture of point * picture * option list
(* xpos, ypos, subpicture, option list *)
| Framebox of point * float * float * option list
(* xpos, ypos, length, height, option list *)
and option = Arrowhead (* line *)
| Anchor of anchor * anchor (* oval, text, framebox *)
| Filled (* circle *)
| Dashed of float (* framebox *)
| Framed (* circle, oval, text, subpicture *)
| Points of int (* curve *)
and anchor = N | L | R | T | B
val output : out_channel -> picture -> unit
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