racket/draw draw-text ignores kerning about draw HOT 6 CLOSED

I think that maybe 'grapheme was the wrong argument to pass. After reading the docs a bit more carefully, I think you want the below.

#lang racket
(require racket/gui/base)

(define str "World")
(define (draw c dc)
  (send dc set-font (send the-font-list find-or-create-font
                          128 "Times New Roman" 'roman 'normal 'normal))
  (define x 10)
  (define y 10)
  (define-values (w h d a)
    (send dc get-text-extent (string (string-ref str 0))))
  (send dc draw-rectangle x y w h)
  (send dc draw-text str x y #t))
(define f (new frame% [width 200] [height 200] [label ""]))
(define c (new canvas% [parent f] [paint-callback draw]))
(send f show #t)

Here is how it looks on my machine:

And if you change the #t to #f or 'grapheme, then you see something similar to your screenshot, where the right edge of the box around the "W" lines up with the left edge of the "o".

from draw.

Hi-- do you get a better result if you use the fourth argument to draw-text?

from draw.

Ah, I see you answered the question about draw-text on discourse, that it doesn't help.

from draw.

Is it possible to move the discussion back to Discourse until the source of the problem?
[Or at least reference this big report on Discourse]

from draw.

It seems to be the default to ignore the kerning. The documentation could be a bit more explicit, because at least I did not expect that ignoring the kerning might be a useful default. In particular because usually in Scheme an undefined value counts as a true value. But you are right: the behavior conforms to the documentation.

from draw.

Yeah, sometimes things get complicated due to backwards compatibility and decisions that were made decades ago that, in retrospect, might not be the best choices. Sorry it took you so much effort to get all this sorted out. Glad to see you're using racket and I hope you'll find it suitable for your larger project!

from draw.