[plt-scheme] picture language predicates?

From: Wolfgang De Meuter (wdmeuter at vub.ac.be)
Date: Mon Sep 7 04:58:57 EDT 2009


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.


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