Using Graphics module in Ocaml toplevel

graphics_in_toplevel

(* SEE: http://mirror.ocamlcore.org/wiki.cocan.org/tips_for_using_the_ocaml_toplevel.html *)

$ ocaml
# #use "topfind" ;;
Findlib has been successfully loaded. Additional directives:
  #require "package";;      to load a package
  #list;;                   to list the available packages
  #camlp4o;;                to load camlp4 (standard syntax)
  #camlp4r;;                to load camlp4 (revised syntax)
  #predicates "p,q,...";;   to set these predicates
  Topfind.reset();;         to force that packages will be reloaded
  #thread;;                 to enable threads

- : unit = ()

# #list ;;  (* list available packages *)

# #require "graphics" ;;
# open Graphics ;;
# open_graph " 640x480";;
# draw_circle 250 250 20; draw_circle 350 250 20; draw_circle 300 200 120; draw_arc 300 200 60 60 180 360;