<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=US-ASCII"> <META content="MSHTML 6.00.2900.2802" name=GENERATOR></HEAD> <BODY id=role_body style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial" bottomMargin=7 leftMargin=7 topMargin=7 rightMargin=7><FONT id=role_document face=Arial color=#000000 size=2> <DIV>The exercise is at: <A href="http://www.ccs.neu.edu/home/matthias/HtDP/Extended/world.html">http://www.ccs.neu.edu/home/matthias/HtDP/Extended/world.html</A></DIV> <DIV>I am considering using this exercise as part of a less-numeric introduction to the non-majors course I am teaching this semester.</DIV> <DIV> </DIV> <DIV>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.</DIV> <DIV> </DIV> <DIV>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.</DIV> <DIV> </DIV> <DIV>If anyone has any suggestions, they would be most helpful.</DIV> <DIV> </DIV> <DIV>Thank you in advance,</DIV> <DIV>Adam Wittenstein</DIV> <DIV>Math/CS Department</DIV> <DIV>Adelphi University</DIV> <DIV> </DIV> <DIV> </DIV></FONT></BODY></HTML>