Bitmaps created using pict->bitmap look pixelated to me on screen (on Mac
OS in "Retina" mode, which I suspect might be relevant). I initially
discovered this when using picts as labels for message% instances like this:
#lang racket/gui
(require pict)
(define f
(new frame%
[label "Example"]))
(new message%
[parent f]
[label (pict->bitmap (disk 100))])
(new canvas%
[parent f]
[style '(transparent)]
[min-width 100]
[min-height 100]
[paint-callback (λ (c dc)
(draw-pict (colorize (disk 100) "green")
dc
0
0))])
(send f show #t)
The black disk in the above is pixelated for me, while the green one drawn
on a canvas looks normal.
I also noticed as I was writing this that evaluating (pict->bitmap (disk
100)) in the DrRacket REPL produces a pixelated result compared to
evaluating (disk 100).
Is there either a way to avoid this in general, or else a recommended way
to do the equivalent of using picts for message% labels in particular? (I
suppose I could subclass canvas% …)
Thanks,
Philip
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