<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><br></div><div>We are not ideologues: </div><div><br></div><div> ;; random: Nat -> Nat </div><div> ;; (random n) is an element of [0,n) </div><div> </div><div>See <a href="http://www.ccs.neu.edu/home/matthias/HtDP2e/Itemizations_and_Structures.html">http://www.ccs.neu.edu/home/matthias/HtDP2e/Itemizations_and_Structures.html</a>, look for random. But yes, this is the only compromise so far. </div><div><br></div><div>The November release will contain forms (and recommendations) for testing functions that employ random. </div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><br><div><div>On Sep 26, 2009, at 9:56 AM, Yaron Minsky wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Argh.  I was still running 4.1 by mistake.  It's right there in plain sight in 4.2.1.<br><br>Another question about the world/universe approach: how do you guys think about randomness?  I've found that adding a bit of randomness can make games considerably more compelling.  But it's not clear how to include randomness in a reasonably simple way that doesn't compromise on the purely-functional nature of the callbacks...<br> <br>y<br><br><div class="gmail_quote">On Sat, Sep 26, 2009 at 9:49 AM, Matthias Felleisen <span dir="ltr"><<a href="mailto:matthias@ccs.neu.edu">matthias@ccs.neu.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div style="word-wrap: break-word;"><br><div><div class="im"><div>On Sep 26, 2009, at 9:43 AM, Yaron Minsky wrote:</div><br><blockquote type="cite">Nice to see everyone up so early on a Saturday morning!<br></blockquote><div> <br></div></div><div>You're late :-]</div><div class="im"><div><br></div><br><blockquote type="cite">Where is 2htdp/universe?  I just installed the latest PLT scheme release, and I don't see anything called "universe" in the list of teachpacks that comes up when I try to add a teachpack.<br> </blockquote><div><br></div><div><br></div></div><div>Use the scrollbar. It's there. </div><div class="im"><div><br></div><div><br></div><div><br></div><br><blockquote type="cite">Anyway, I'm glad to see this getting worked on.  I think one of the things that Scratch got right is that it provides simple image transformations, which turn out to be very useful in constructing simple-yet-compelling games.  I think having more of this stuff for drscheme will make it considerably more compelling for the younguns.<br> <br>y<br><br><div class="gmail_quote">On Sat, Sep 26, 2009 at 9:29 AM, Matthias Felleisen <span dir="ltr"><<a href="mailto:matthias@ccs.neu.edu" target="_blank">matthias@ccs.neu.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <br> <br> 1. htdp/world is deprecated, use 2htdp/universe instead.<br> <br> 2. we consider the pinhole approach to our image library as a mistake. To solve the problem Robby is working on 2htdp/image, a replacement for the image library. When it comes out (end of semester probably) it will support rotate and other such operations, plus comparisons will be much faster.<br> <font color="#888888"> <br> -- Matthias</font><div><br> <br> <br> <br> <br> <br> On Sep 26, 2009, at 9:17 AM, Yaron Minsky wrote:<br> <br> </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div> I'm playing around with the image.ss and world.ss teachpacks, and I couldn't figure out how to scale and rotate images.  Are there such image transformation functions in some other teachpack?<br> <br> y<br></div> <div> _________________________________________________<br>  For list-related administrative tasks:<br>  <a href="http://list.cs.brown.edu/mailman/listinfo/plt-scheme" target="_blank">http://list.cs.brown.edu/mailman/listinfo/plt-scheme</a><br> </div></blockquote> <br> </blockquote></div><br></blockquote></div></div><br></div></blockquote></div><br></blockquote></div><br></body></html>