I've pushed an edit to the docs that attempts to address this point.
On Sat, Mar 24, 2018 at 3:44 PM, Stephen Smith
> Hi Everyone,
> When running the following example from the Racket docs section titled 'The
> Nitty Gritty of Pixels, Pens, and Lines':
> (define p1 (make-pen "black" 1 "solid" "round" "round"))
> (rectangle 20 20 "outline" p1)
> instead of a rectangle with all four sides drawn with equal thickness as
> shown in the example output, I get the top and left sides drawn with 1 pixel
> and the right and bottom sides are drawn as gray lines. I'm running it in
> DrRacket (v6.12).
> I suspected that DrRacket was cropping the image in the interactions area so
> I did this:
> (overlay/align "middle" "middle" (rectangle 20 20 "outline" p1) (rectangle
> 40 40 "outline" p1))
> and sure enough, the inner rectangle appeared with all four sides having
> equal thickness, as shown in the example.
> The cropping of the image in DrRacket might not be obvious to the reader
> working along with the examples (even though that is, in essence, the
> subject of this section :-). Should something be put in the docs to clarify
> this? Perhaps add a snippet similar to what I created with the overlay/align
> function and mention that DrRacket will crop the outer rectangle in the
> interactions area? I know this seems to go against the 'writing style' used
> in the docs but I believe most users will be following along with DrRacket.
> Maybe a sidebar mention would be worthwhile to avoid initial confusion?
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