[racket] sample code for vertical sliders in 2htdp/universe

From: John Clements (clements at brinckerhoff.org)
Date: Wed Oct 24 18:26:23 EDT 2012

I'm not sure where to stash this; I wrote some fairly extensible sample code (follows the design recipe, natch) to allow my students to create vertical sliders using 2htdp/universe.

Here's a movie of the resulting sliders:


Here's the code:


Hope this is useful to someone!


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