That's probably at least part of why Tk is horrible and needs to die a long
overdue death. Whereas Gtk can simply share a memory buffer with the user
with very little overhead. (full disclosure: I wrote and maintain the
Gtk.jl wrapper, with the express purpose of making Tk go away)
julia> using Gtk.ShortNames
julia> win = @Window("Test", 800, 600);
julia> data = Gtk.RGB[Gtk.RGB(div(255*x,800),div(255*y,600),0) for x=0:800,
y=0:600];
julia> pixbuf = @Pixbuf(data=data,has_alpha=false) # removing the has_alpha
parameter required variable is https://github.com/JuliaLang/Gtk.jl/issues/94
julia> view = @Image(pixbuf);
julia> push!(win,view);
julia> showall(win);
julia> data[:] = Gtk.RGB(0,0,0);
julia> G_.from_pixbuf(view, pixbuf) # this function calls
gtk_image_set_from_pixbuf, which is necessary to tell our GtkImage canvas
that it needs to redraw now
julia> @time for i = 1:255
data[:] = Gtk.RGB(0,0,i)
G_.from_pixbuf(view, pixbuf)
sleep(0.01)
end
elapsed time: 3.799350398 seconds (113220 bytes allocated)
julia> 0.01*255
2.5500000000000003
On Sun, Jul 6, 2014 at 11:02 PM, De Prins Maxime <de.prins.max...@gmail.com>
wrote:
> Hi,
>
> *I can do this:*
>
>
> using Base.Graphics
>
> using Cairo
>
> using Tk
>
>
>
> using Base.Graphics
>
> using Cairo
>
> using Tk
>
>
> win = Toplevel("Test", 800, 600)
>
> c = Canvas(win)
>
> pack(c, expand=true, fill="both")
>
> ctx = getgc(c)
>
> for x = 0:800
>
> for y = 0:600
>
> set_coords(ctx, x, y, 1, 1, 0, 1, 0, 1)
>
> set_source_rgb(ctx, x/800, y/600, 0)
>
> paint(ctx)
>
> end
>
> end
>
> reveal(c)
>
> Tk.update()
>
> But it is slow and not very nice.
>
> Thanks
>
>
