:- use_module(library(python)).
:- initialization(main).
setup_dir :-
prolog_load_context(directory, Dir),
atom_concat(Dir,'/pyx/',Base),
assert(base(Base)).
:- setup_dir.
main :-
ex(X),
flush_output,
fail.
main.
ex(hello_world) :-
c := pyx:canvas:canvas,
:= $c:text(0, 0, 'Hello, world!'),
:= $c:stroke(path:line(0, 0, 2, 0)),
:= $c:writePDFfile('hello').
ex(changebar) :-
g := pyx:graph:graphxy(width=8, x=graph:axis:bar),
atomic_concat(Source, 'minimal.dat', Data),
:= $g:plot(graph:data:file(Data, xname=0, y=2), [graph:style:changebar]),
:= $g:writePDFfile(changebar).
