Seeking compelling high school examples

[Christopher Sawtell]

On Mon, 28 Apr 2003 05:24, Kim Rose wrote:
> Hi, Christopher -
> Thanks so much...but when I loaded this url all I got was a blank
> Squeak project... hmmmmm???
> Kim

Dear O dear,

I've just checked, the full file is definitely there.
[chris at berty chris]$ ls -l /var/www/html/CSpendulum.pr
-rw-r--r--    1 chris    users      206881 Apr 27 23:19 
/var/www/html/CSpendulum.pr


Here are the md5sums so you can check that there have not been any trasmission 
errors:-
2296d55657a529bf754751d084ba419a  /var/www/html/CSpendulum.pr
01fef3280bd77e6adb99cb9842f81743  /var/www/html/GraphBug.pr

If that's correct, it looks as if we have been caught out by incompatible 
interpreters or something else to do with using moving target software.
I upgraded the image and changes files only a couple of days ago. I think I'm 
up to date, but I'm not sure?

Here are the version details of the Squeak interpreter I'm using.

chris at liberty chris $ squeak -version
3.4-1 #1 XShm Thu Mar 13 22:24:42 NZDT 2003 gcc 3.2.1
Squeak3.4 of 1 March 2003 [latest update: #5170]
Linux liberty.localnet 2.4.20-xfs_pre6 #1 Sat Mar 8 20:42:23 NZDT 2003 i686 
Pentium II (Deschutes) GenuineIntel GNU/Linux
default plugin location: /usr/local/lib/squeak/3.4-1/*.so

> 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.