[racket-dev] draw-text always pixel aligned?

Did you mean to pass 'unaligned instead of 'aligned as the last
argument to `find-or-create-font`? That should disable pixel alignment.

At Mon, 16 Dec 2013 01:28:23 -0500, David Vanderson wrote:
> Hello,
> 
> It seems that draw-text always pixel-aligns its text. In the example 
> below, I draw a black "hello" on top of a red one, with a pixel offset 
> of 0, 0.1, 0.2, . . . 0.9. At least for me, I see no change until 0.5, 
> where the black text jumps a whole pixel (see attached image).
> 
> Am I missing something? Do others see this behavior?  (I'm on Linux)
> 
> Thanks,
> Dave
> 
> 
> #lang racket/gui
> 
> (define (draw-text dc offset)
>    (send dc set-text-foreground "red")
>    (send dc draw-text "hello" 0 0 #t)
>    (send dc set-text-foreground "black")
>    (send dc draw-text "hello" offset offset #t))
> 
> (define (draw-screen canvas dc)
>    (send dc set-smoothing 'smoothed)
>    (send dc set-font
>          (send the-font-list find-or-create-font
>                12 'default 'normal 'normal #f 'smoothed #f 'aligned))
>    (send dc set-initial-matrix (vector 1 0 0 1 0 0))
>    (for ((i 10))
>      (draw-text dc (/ i 10.0))
>      (send dc translate 50 0)))
> 
> (define frame (new frame% (label "Test draw-text")))
> 
> (define canvas
>    (new canvas%
>         (parent frame)
>         (min-width 500)
>         (min-height 100)
>         (paint-callback draw-screen)))
> 
> (send frame show #t)