Creating "commands" for Etoys

Lex Spoon lex at cc.gatech.edu
Mon Mar 26 15:45:06 UTC 2001


J Scott Jaderholm <scott at jaderholm.com> wrote:
> Ok, there must be a way to do this then without creating my own
> commands, but I don't know how.
> 
> I have three SketchMorphs named Moon, Earth, and Sun.  I want the Moon
> to revolve around the Earth, and the Earth to revolve around Sun.
> 
> I was going to make a command that would change the moon's X,Y based on
> the Earth's X,Y, but if I can't create commands that's not really an
> option.
> 
> I guess there's a better way to do this using the commands we already
> have..any ideas what that way is?
> 

Do you know about arithmetic in EToys?  Click the little green arrow
pointing to the right, and you can adjust a value using basic
arithmetic.  So you can do things like:

	Moon's x <- Earth's x + Moon's deltaX


-Lex





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