2012/5/26 Robby Findler <[email protected]>: > It is possible something is wrong with hline and/or its interaction > with scaling, I'm not sure. But this adds enough space: > > #lang racket > (require slideshow/pict) > (hc-append (blank 15 0) > (vc-append (scale (hline 30 1) 30) > (blank 0 15)) > (blank 15 0))
So an educated guess on how much space to add would be
the line width times the scaling?
> I wonder if something is wrong somewhere, tho, because the bounding
> box of the above appears to have some pixels of empty space on the
> top.
>
> The space on the left and right is count for the pen cap, not the line
> itself so that seems fine.
>
> As for cropping, the DrRacket REPL is the thing that does the cropping
> (and, in some cases, it may not be cropping, actually, but two
> different parts of the window are fighting with each other for the
> pixels when something draws outside of its bounding box, as a scaled
> hline does).
Okay, I thought there was a guarantee that the drawing happened
inside the bounding box.
Something is fishy with hline or my understanding of hline though.
In order to avoid using scale I tried this:
(pict->bitmap (hline (* 20 30) 20))
and got a one pixel line. See attached image.
(On version 5.3.0.6--2012-05-11 btw)
/Jens Axel
<<attachment: hline.png>>
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