[plt-scheme] Question about Matthias' Animation Exercise

From: Matthias Felleisen (matthias at ccs.neu.edu)
Date: Wed Jan 18 21:11:33 EST 2006

I very much recommend using


if you have installed DrScheme v300. Don't bother with draw.ss. It's 
half as much fun.

The next edition of the book will use a series of exercises like the 
above, but the "principles" material will remain the same.

The above doesn't use Posn's, well only for small things. It also 
motivates the use of structures (classes w/o methods) much more 
methodically than the old draw.ss.

hth -- Matthias

On Jan 18, 2006, at 12:48 PM, Adelphi02 at aol.com wrote:

> The exercise is at: 
> http://www.ccs.neu.edu/home/matthias/HtDP/Extended/world.html
> I am considering using this exercise as part of a less-numeric 
> introduction to the non-majors course I am teaching this semester.
> I notice the simple-draw.ss teachpack no longer exists, and as a 
> fairly new instructor, I do not have a copy of it.  In particular, I 
> am looking at the draw-solid-rect0 function in section 1.2.  As I see 
> it, I have two options.  One, I can use draw-solid-rect, but that 
> would require introducing posns, which my students can barely handle 
> after midterms, so I almost definitely would not try it in an 
> introductory unit.  The other more likely option is to use the 
> nw-rectangle function in the world.ss teachpack.
> But there I have a problem because DrScheme will not allow me to 
> install draw.ss and world.ss simultaneously.  And I need draw.ss to 
> open the canvas.
> If anyone has any suggestions, they would be most helpful.
> Thank you in advance,
> Adam Wittenstein
> Math/CS Department
> Adelphi University
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