On Fri, 16 Sep 2016 06:04:09 -0500, Robby Findler
wrote:
>You could draw into a bitmap and then have on-paint draw that bitmap, too.
>
>Robby
Yes. "Double buffering" with an off-screen bitmap is the best way to
minimize redrawing.
However, it also should be pointed out that the DC has a clippin
You could draw into a bitmap and then have on-paint draw that bitmap, too.
Robby
On Fri, Sep 16, 2016 at 2:53 AM, Jens Axel Søgaard
wrote:
> As Alex writes the operating system (the system GUI) might erase parts of a
> window at
> any time. Therefore you need to do all your drawing from within o
As Alex writes the operating system (the system GUI) might erase parts of a
window at
any time. Therefore you need to do all your drawing from within on-paint.
http://stackoverflow.com/q/16084690/23567
/Jens Axel
2016-09-16 7:09 GMT+02:00 Alex Harsanyi :
> According to the documentation for th
According to the documentation for the canvas<%> interface you cannot rely on
the canvas not being cleared
(http://docs.racket-lang.org/gui/canvas___.html?q=canvas%3C%25%3E):
Even when the canvas’s style suppresses explicit clearing of the canvas, a
canvas may be erased by the windowing system
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