[plt-scheme] Using a canvas% and its dc<%>
Hello,
I was trying to draw a red circle on a window. Simple task, it seemed.
So I wrote this little batch of code.
(define w (instantiate frame% ()
[label "Test frame"]))
(define c (instantiate canvas% ()
[parent w]
[min-width 500]
[min-height 500]))
(define d (send c get-dc))
(define p (send the-pen-list find-or-create-pen
"red" 2 'solid))
(send w show #t)
(send d set-pen p)
(send d draw-ellipse 100 100 200 200)
Little window, with a canvas in it, and it draws a red circle, filled with
white; less then a second later, though, the entire window is filled with
white, and my circle is nowhere to be found.
What could be the problem?
Katsmall the Wise
kela_bit at netvision.net.il