[Squeakland] reflection symmetry

Alan Kay alan.kay at squeakland.org
Tue Feb 1 18:42:09 PST 2005


Hi Randy --

I think this one is a bug (or in this case more accurately: an 
unimplemented feature). It should perform the way you want (and I think we 
should put in this feature). But there is a way to script in etoys what you 
are trying to do.

Cheers,

Alan

-------

At 12:57 PM 2/1/2005, Randy Heiland wrote:
>I'm attempting to perform a 2-D reflection symmetry on an object by doing a
>left-right flip 180 degs - as depicted in the attached jpg (assuming it
>comes across OK).  Basically what I've done is sketched 1/2 of a
>(bilaterally symmetric) leaf, moved its rotation center to the axis of
>reflection, and in a script:
>
>   Sketch's rotationStyle - flip left right
>   Sketch turn by 180
>
>However, when I execute the script, the object gets flipped "in place",
>about the center of the object (as if I'd never moved the rotation center),
>rather than about the rotation center as I desired.  In fact, moving the
>rotation center anywhere has no effect on the flip action.
>
>Suggestions?
>
>--Randy
>
>
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