[plt-scheme] picture language predicates?

From: Noel Welsh (noelwelsh at gmail.com)
Date: Mon Sep 7 11:38:33 EDT 2009

I have a simple visualisation package that composes pictures out of
circles, dots, etc. Code is here:


It doesn't support graphical snips like the picture language, but you
can render to a MrEd window. It might be of use.


On Mon, Sep 7, 2009 at 9:58 AM, Wolfgang De Meuter<wdmeuter at vub.ac.be> wrote:
> Hello
> I'm trying to use the picture language to create some courseware. Are there
> any predicates allowing me to test whether a picture is a circle,
> rectangle,... If not... any other hacks that allow me to know what the
> 'type' of a picture is? I was thinking about writing procedures for
> calculating circumferences for various pictures.
> Regards
> Wolf
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