Hi Jos,
I don't think the coordinates are /meant/ to be real valued ... I
think somebody just used real? as the check function. Or possibly the
docs all are wrong: if you look at racket/draw you'll see that all the
functions specify coordinates as real values. It certainly doesn't
make any other sense.
Also, if you haven't already, you should ask in the discourse.
George
On 5/30/2026 1:44 PM, Jos Koot wrote:
Hi
posn-s of graphics/graphics are structs with two reals. They are used
to locate objects in a viewport. I would expect locations to be
identified by two exact nonnegative integers pointing to a pixel. We
don't have fractions of pixels, do we? Where for example is
(make-posn 3.4 5.6)? Does it identify the same position as (make-posn
3 6)? Maybe there is a reason posn has reals, but I do not see why. If
there is such a reason, please tell me.
Racket is great!!!
Jos
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