Thanks Bert. On Mon, Jun 11, 2012 at 6:02 AM, Bert Freudenberg <[email protected]>wrote:
> > On 2012-06-11, at 05:57, Steve Thomas wrote: > > Folks, > > I created a video of a code walk through for my students. It's an > algorithm to create a "Green Screen" effect in Etoys. > As I am definitely a novice when it comes to Squeak, I would appreciate > any feedback on how I can correct/improve the explanations. > > Here is a link to the video of the code walk > through<http://www.youtube.com/watch?v=T5WTS9ql_gQ> and > the introduction video <http://youtu.be/B39DU7LRgL4>to wet the kids > appetitie. > > > > Awesome walkthrough! > > Nit picks: > > * pages 8 and 10: when you explain iterating over y, the example code on > the right should use height, not width ;) > > * page 14: 0@0 in Squeak generally denotes the top-left, with increasing > y values going down. Only Etoys pretends to use a proper Cartesian > coordinate system with y going up, and the origin in the lower left (or > center, depending on your playfield's settings). So the image code actually > goes through the pixels from top to bottom, whereas you show it going from > bottom to top. > > Also, for others to replicate your coding, you may have to briefly show > how to make a textual Etoys script. > > - Bert - > > > > _______________________________________________ > Beginners mailing list > [email protected] > http://lists.squeakfoundation.org/mailman/listinfo/beginners > >
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