如何编译ocaml图形Windows Cygwin

Question

I use cygwin 64 terminal on Windows and want to compile this ocaml graphics code. It's saved as a .ml type:

let etat x y c=draw_circle x y 10 ;let a=(x-5) and b=(y-5) in moveto a b ;let s=string_of_int c in draw_string s;;
etat 100 100 1;;
etat 200 200 3;;

I'm confused between : load graphics.cma open Graphics Graphics.open_graph

And should I use ocamlc -og graphics.cma g.ml to compile?

Answer 1

i'm confued between : load graphics.cma open Graphics Graphics.open_graph

• load is a directive of the interactive toplevel. It is not part of the OCaml language. You are using directives to command the interactive toplevel. And it is used to load code to the toplevel.

• open Graphics is a language construct that will bring names of definitions in module Graph to the current scope. This allows you to write open_graph instead of Graphics.open_graph . It is better not to open too many modules (if any) as it may pollute your namespace, and make your code less understandable.

• Graphics.open_graph is a function, that, when invoked, will open a graphics window in your machine.

and should i use ocamlc -og graphics.cma g.ml to compile.

Yep, you can use ocamlc to compile your code. The OCaml compiler toolchain is rather difficult to use. However, there is a compilation manager, called ocamlbuild, that should work like magic, eg,

 ocamlbuild -pkg graphics g.byte

You will get a g.byte executable that you can run.