[Newbies] Green Screen in Etoys

[karl ramberg]

Great work. You make very approachable projects. Always fun to watch.


Karl

On Mon, Jun 11, 2012 at 2:43 PM, Steve Thomas <sthomas1 at gosargon.com> wrote:
> Thanks Bert.
>
> On Mon, Jun 11, 2012 at 6:02 AM, Bert Freudenberg <bert at freudenbergs.de>
> 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 at 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 -
>>
>>
>>
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>
>
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