[racket] picts in Scribble

Excellent!
Great job Matthew!

On Sat, Nov 27, 2010 at 15:54, Matthew Flatt <mflatt at cs.utah.edu> wrote:

> In the latest development version:
>
> The `slideshow/pict' library no longer depends on `racket/gui' --- just
> `racket/draw', which can be used without a GUI display (e.g., an X
> connection).
>
>
> Scribble now renders picts directly for HTML or PDF output. The
> document source
>
>  #lang scribble/base
>  @(require slideshow/face)
>
>  @title{Faces}
>
>  @section{Happy}
>
>  @(face 'happy "yellow")
>
>  @section{Not So Happy}
>
>  @(face 'unhappy "lightblue")
>
> produces what you'd expect.
>
>
> More precisely, Scribble renders values that are convertible to PNG
> (and optionally PDF format) via the new `file/convertible' protocol.
> The protocol is simple, but the indirection keeps Scribble from
> depending directly on the pict library or vice versa. Plain `bitmap%'s
> are convertible to PNG, too, so a bitmap in a Scribble document renders
> as its image.
>
> As an example, the "Quick" document now mostly uses the plain
> `interaction' form with an evaluator that has `slideshow/pict' loaded.
> In the Slideshow docs, some ASCII art in the description of the pict
> datatype has been replaced by a real picture (that is implemented as a
> pict, of course).
>
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