<html> <head> <style></style> </head> <body class='hmmessage'> Thanks very much! I didn't quite grasp the interface, and thought I was supposed to "Open" teachpacks; after trying "Language->Add Teachpack" everything works just fine. I appreciate your help.<BR> <BR> <HR id=stopSpelling> Subject: Re: [racket] trouble with draw.ss teachpack<BR>From: matthias@ccs.neu.edu<BR>Date: Sun, 19 Sep 2010 16:55:34 -0400<BR>CC: users@racket-lang.org<BR>To: planarian@hotmail.com<BR><BR> <META content="Microsoft SafeHTML" name=Generator><BASE> <DIV><BR></DIV> <DIV>1. The draw teachpack should be used with the HtDP teaching languages only. </DIV> <DIV><BR></DIV> <DIV>I just did so and the following program runs just fine in Beginning Student Language. </DIV> <DIV><BR></DIV> <DIV> <DIV>(start 100 100)</DIV> <DIV>(draw-circle (make-posn 30 30) 10 'blue)</DIV></DIV> <DIV>;; there's nothing else in the Def area </DIV> <DIV><BR></DIV> <DIV>2.  I recommend shunting the first two chapters in HtDP in favor of </DIV> <DIV><BR></DIV> <DIV><A href="http://www.ccs.neu.edu/home/matthias/HtDP2e/index.html" target=_blank>http://www.ccs.neu.edu/home/matthias/HtDP2e/index.html</A></DIV> <DIV><BR></DIV><BR> <DIV> <DIV>On Sep 19, 2010, at 2:24 PM, Jay wrote:</DIV><BR class=ecxApple-interchange-newline> <BLOCKQUOTE> <DIV class=ecxhmmessage style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">Hello,<BR> <BR>I'm a complete newcomer to Racket. I've just begun working my way through HTDP, and have run into problems with exercise 6.2.1, which uses draw.ss. When I load the file, Racket complains when I make any reference to the "posn" struct (which is essential to all of the drawing tools), saying that it hasn't been defined. If I change tactics and try to start from the standard "beginner's" language (which does include the necessary "posn" definitions) and then copy over and run the declarations from draw.ss, that produces a "module not defined" error. I'd appreciate any guidance.<BR> <BR>Thanks for your time!<BR> <BR> <BR>Jay<BR>_________________________________________________<BR> For list-related administrative tasks:<BR> <A href="http://lists.racket-lang.org/listinfo/users" target=_blank>http://lists.racket-lang.org/listinfo/users</A></DIV></BLOCKQUOTE></DIV><BR> </body> </html>