I have never worked with a canvas% before (I have worked with a lot of other
racket gui stuff), so I have no idea what’s going on, but watch what happens
with this:
#lang racket
(require racket/gui/base)
(define frame (new frame%
[label "Example"]
[width 300]
[height 300]))
(define canvas
(new canvas% [parent frame]))
(define dc (send canvas get-dc))
(send frame show #t)
(sleep 1)
(send dc draw-rectangle 30 20 10 40)
And even better, with this:
#lang racket
(require racket/gui/base)
(define frame (new frame%
[label "Example"]
[width 300]
[height 300]))
(define canvas
(new canvas% [parent frame]))
(define dc (send canvas get-dc))
(send frame show #t)
(sleep 1)
(send dc draw-rectangle 30 20 10 40)
(sleep 2)
On Jun 2, 2015, at 3:17 PM, John Smith <rashreportl...@gmail.com> wrote:
> Alexis,
> Thank you for the speedy answer.
> I think I correctly implemented what you described. See attached.
> In the new code, no error is thrown but the rectangle is not drawn.
> Reorderings of displaying the window and drawing the rectangle appear to have
> no effect.
> The only way I can get anything to show up is if I enter it in the REPL once
> the code is executed.
>
> Any idea what might be causing this?
>
> -Luke
>
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