[racket] picts in Scribble

This is the greatest thing since slice define-expression thingies. Thanks! 


On Nov 27, 2010, at 9:54 AM, Matthew Flatt 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 datatype has been replaced by a real picture (that is implemented as a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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