[Squeakland] spiral

Alan Kay alan.kay at squeakland.org
Tue Dec 7 14:59:00 PST 2004


Thanks Kim --

... we should probably write up something about what they mean and how they 
can be used ...

Cheers,

Alan

-------------

At 02:43 PM 12/7/2004, Kim Rose wrote:
>Hi, Randy/Alan --
>Randy is indeed using the latest/greatest "Etoy/Squeakland" version. Both 
>"theta" and "headingTheta" appear by default in the geometry category of 
>an object's viewer in this version.
>  -- Kim
>
>
>At 4:24 PM -0500 12/7/04, Randy Heiland wrote:
>>Uh, I said "Squeak" backwards 3 times really fast? :)  It's possible that my
>>environment may be a bit screwy.  Early on I was using some full-blown
>>version of Squeak, but thought that I was currently using the Etoys version.
>>The world -> desktop menu -> help -> "about this system" tells me I'm
>>running Squeakland 3.8.5976 update #371
>>
>>--Randy
>>
>>>  -----Original Message-----
>>>  From: Alan Kay [mailto:alan.kay at squeakland.org]
>>>  Sent: Tuesday, December 07, 2004 4:05 PM
>>>  To: JOHN VOIKLIS; Randy Heiland
>>>  Cc: squeakland at squeakland.org
>>>  Subject: Re: [Squeakland] spiral
>>>
>>>  To John and Randy
>>>
>>>  By the way, headingTheta is part of the vector category in etoys, has a
>>>  different purpose and orientation than "heading", and is not needed for
>>>  making spirals or other LOGO like geometric figures. "headingTheta" (and
>>>  the rest of the vector stuff) is usually not visible in a vanilla Etoy
>>>  system. How did you get it to be visible in yours?
>>>
>>>  Cheers,
>>>
>>>  Alan
>>>
>>>  -----------
>>>
>>>  At 06:31 AM 12/7/2004, JOHN VOIKLIS wrote:
>>>  >Hi Randy,
>>>  >
>>>  >Attached is a quick, if somewhat simple-minded, fix.
>>>  >
>>>  >Best,
>>>  >
>>>  >John
>>>  >
>>>  >
>>>  >On Mon, 6 Dec 2004 14:57:50 -0500, Randy Heiland <heiland at indiana.edu>
>>>  wrote:
>>>  > > How might one create a script to draw a spiral?  I mistakenly thought
>>>  that
>>>  > > if I did something like:
>>>  > >
>>>  > > Fwd by 5
>>>  > > Turn by <obj> headingTheta + 2
>>>  > > penDown
>>>  > >
>>>  > > that I might accomplish it.  However, it seems that the headingTheta
>>>  is not
>>>  > > dynamically updated in this script, i.e. the heading never changes.
>>>  > >
>>>  > > Thanks, Randy
>>>  > >
>>>  > > _______________________________________________
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>>>  > >
>>>  >
>>>  >
>>>  >--
>>>  >***FOR ALL THOSE WHO INCLUDE ME IN THEIR ADDRESS BOOKS, PLEASE CHANGE
>>>  >MY ADDRESS TO: voiklis @gmail.com***
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>>
>>
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