Seeking compelling high school examples

Kim Rose Kim.Rose
Mon May 5 08:53:41 PDT 2003


Hi, Christopher -
Thanks so much...but when I loaded this url all I got was a blank 
Squeak project... hmmmmm???
Kim


At 12:07 AM +1200 4/28/03, Christopher Sawtell wrote:
>On Sun, 27 Apr 2003 14:25, Kim Rose wrote:
>>  --
>>  Greetings -
>>
>>  Viewpoints Research is working on updating the Squeakland.org
>>  website.  As part of this project,  we wish to point to a variety of
>>  schools, groups, community centers, etc. using Squeak (the Etoy-tile
>>  scripting component) and include interesting project examples.
>
>I have added a graphical angle watcher to Randy Caton's Pendulum.
>It draws a sinusoidal graph in real time of the simulated pendulum's angle as
>it swings to and fro. I have also put some annotations on it. The plotter
>script is not synchronous with the pendulum script, so by changing the sample
>rate of the plotter one can demonstrate the effect of too slow a rate
>destroys the effective measurement of the waveform. It's quite pretty, though
>I say so myself, and my 13 year old son was somewhat impressed.
>
>It's here:-
>
>http://berty.dyndns.org/CSpendulum.pr
>
>While doing this I noticed that there's a minor bug in the drawing of the
>graph lines on a Playfield. The horizontal lines appear to be drawn relative
>to the top of the Playfield, whereas the 'y' coordinate of an object is
>measured with respect to the bottom of the Playfield. This means that unless
>the height of the Playfield is an exact multiple of the graticule size then
>the actual 'y' co-ordinate and its values as read off the graph do not
>correspond. This is demonstrated with a simple project here:-
>
>http://berty.dyndns.org/GraphBug.pr
>
>The red plotted line should go through the corners of the green squares
>precisely.
>
>HTH
>
>--
>C. S.


-- 



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