Re: LOGO-L> Total Turtle Trip

[George Mills <mills@softronix.com>]

Chuck Shavit wrote:
> 
> George Mills writes:
> > However Chuck has not admitted ARC does the same thing.
> > But I know it is because I know how his Logo code would get executed
> > and ARC simply cuts out some unnecessary work. :-)
> 
> It's funny that the creator of 3D Logo asks me that question.
> 
> "Chuck's" circle and ARC do not do the same thing in the 3D case.
> "Chuck's" circle creates a real 3D circle, which looks like an ellipse when
> viewed from the side.  ARC doesn't.  Or am I missing something?
> 
> Chuck

Your missing how 3D works in MSWLogo.

If you ROLL your turtle (drawing plane) to 45 degrees from your
point of view and draw a 360 degree ARC you will get what "looks
like" a 1:2 ratio ellipse.

Don't mix what things "look like" from what they are. An ARC
is an ARC in 2D or 3D no matter how it's oriented or viewed.
You could use your "DOT" flavor, the "POLY" flavor or the "ARC"
flavor they will all work in 3D and all will "look like" an
1:2 ellipse if viewed or rotated at 45 degrees.

I'll let you catch up with my other replies, maybe they will help.

-- 
===============================================================
George Mills (mills@softronix.com)
http://www.softronix.com/
The www page contains some very powerful educational software.
Our single most important investment is our kids.
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