Green Screen in Etoys
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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 and the introduction video to wet the kids appetitie.
Cheers, Stephen
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Great videos. Looks like the book morph is a great way to make a presentation. And those arrows, I guess, are part of the connectors package.
If your asking how to improve the explanations, I can't say I've got anything to offer. Working with students, to my mind, has made you present things in a highly comprehensible way. Nice work, Chris On 2012-06-10, at 11:57 PM, Steve Thomas wrote: Folks, _______________________________________________ Beginners mailing list [hidden email] http://lists.squeakfoundation.org/mailman/listinfo/beginners |
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Thanks Chris.
On Mon, Jun 11, 2012 at 12:23 AM, Chris Cunnington <[hidden email]> wrote:
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In reply to this post by Steve Thomas
On 2012-06-11, at 05:57, Steve Thomas wrote: Folks, 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 [hidden email] http://lists.squeakfoundation.org/mailman/listinfo/beginners |
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Thanks Bert.
On Mon, Jun 11, 2012 at 6:02 AM, Bert Freudenberg <[hidden email]> wrote:
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Great work. You make very approachable projects. Always fun to watch.
Karl On Mon, Jun 11, 2012 at 2:43 PM, Steve Thomas <[hidden email]> wrote: > Thanks Bert. > > On Mon, Jun 11, 2012 at 6:02 AM, Bert Freudenberg <[hidden email]> > 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 and the introduction >> video 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 >> [hidden email] >> http://lists.squeakfoundation.org/mailman/listinfo/beginners >> > > > _______________________________________________ > Beginners mailing list > [hidden email] > http://lists.squeakfoundation.org/mailman/listinfo/beginners > Beginners mailing list [hidden email] http://lists.squeakfoundation.org/mailman/listinfo/beginners |
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