[racket] freeze and bounding boxes

From: Robby Findler (robby at eecs.northwestern.edu)
Date: Wed Jan 18 21:05:09 EST 2012

On Wed, Jan 18, 2012 at 5:22 PM, David Van Horn <dvanhorn at ccs.neu.edu> wrote:
> On 1/18/12 6:04 PM, Robby Findler wrote:
>> Yes, that's the right behavior. See the end of the 2htdp/image docs
>> about pixels and whatnot.
> OK, it seems at odds with the note that freeze can "improve performance
> without changing how the image draws," but I get that a square draws larger
> than its bounding box so it gets cropped when frozen (or saved to a file).

I've clarified that in the docs.

> By the way, I think you can see this phenomenon in the rendering of the
> 2htdp/image docs.  So for example, the section you referred me to has this
> example:
>   (let* ([s (rectangle 20 20 "outline" "black")]
>          [r (beside s s s s s s)])
>       (above r r r r r r))
> which when run in DrRacket produces a grid, but in the docs crops the right
> and bottom lines.  That makes the discussion about cropping very confusing.
>  Also: it seems you cannot in general have Scribble examples that involve
> outlined shapes such that they look like they really appear in DrRacket.

I see the attached in the docs. Do you see differently?
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Screen Shot 2012-01-18 at 7.52.10 PM.png
Type: image/png
Size: 16450 bytes
Desc: not available
URL: <http://lists.racket-lang.org/users/archive/attachments/20120118/9da30663/attachment-0001.png>

Posted on the users mailing list.