Possible to display pre-existing plot in Gtk4 ?

[jonathanBieler]

Hi, I'm trying to use Plots with GR in Gtk4, the example provided works well but I'd like to be able to take any plot and display it on the canvas. Is there a way to do that ? I couldn't figure it out. Calling display do show the plot initially but it doesn't redraw when the size change. Thanks!

using Gtk4, Serialization
using Plots
using Printf

c = GtkCanvas()

p = scatter(rand(100))

function _plot(ctx, w, h)
    ENV["GKS_WSTYPE"] = "142"
    ENV["GKSconid"] = @sprintf("%lu", UInt64(ctx.ptr))
    #plot(p, size=(w, h))
    
    display(p)
end

@guarded draw(c) do widget
    ctx = getgc(c)
    w = width(c)
    h = height(c)
    @show w, h
    rectangle(ctx, 0, 0, w, h)
    set_source_rgb(ctx, 1, 1, 1)
    fill(ctx)
    _plot(ctx, w, h)
end

win = GtkWindow("Gtk4 example", 600, 450)
win[] = c

e = GtkEventControllerMotion(c)

function on_motion(controller, x, y)
    win.title = @sprintf("(%g, %g)", x, y)
    reveal(c) # triggers a redraw
end

signal_connect(on_motion, e, "motion")

[jheinen]

I just added a Gtk4 Plots example:

using Gtk4
using Plots
using Printf

c = GtkCanvas()

function _plot(ctx, w, h)
    ENV["GKS_WSTYPE"] = "142"
    ENV["GKSconid"] = @sprintf("%lu", UInt64(ctx.ptr))
    gr(show=true)
    plot(randn(10, 3), size=(w, h))
end

@guarded draw(c) do widget
    ctx = getgc(c)
    w = width(c)
    h = height(c)
    @show w, h
    rectangle(ctx, 0, 0, w, h)
    set_source_rgb(ctx, 1, 1, 1)
    fill(ctx)
    _plot(ctx, w, h)
end

win = GtkWindow("Gtk4 example", 600, 450)
win[] = c

e = GtkEventControllerMotion(c)

function on_motion(controller, x, y)
    win.title = @sprintf("(%g, %g)", x, y)
    reveal(c) # triggers a redraw
end

signal_connect(on_motion, e, "motion")

As you can see, for Plots you will have to add the gr(show=true) command.

[jonathanBieler]

Thanks for the quick answer. What I'm trying to do is to have a Canvas opened and then display a plot on it, then plot another one, etc. but I your example the plot is "hardcoded" in the _plot function and redone at each update.

Something like that but this doesn't redraw when resizing :

p = plot(randn(10, 3))

function _plot(ctx, w, h)
    ENV["GKS_WSTYPE"] = "142"
    ENV["GKSconid"] = @sprintf("%lu", UInt64(ctx.ptr))
    gr(show=true)
    display(p)
end