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Joined: Jul 2007
Posts: 1
stranger
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OP
stranger
Joined: Jul 2007
Posts: 1 |
Hello! Your spirograph page http://wordsmith.org/anu/java/spirograph.html is very interesting. I am trying to understand "moving circle radius" and "moving circle offset." I accidentally set the moving circle radius to a negative number and got an interesting picture, but I don't know what a negative radius represents. I am guessing that "offset" is a way to place the pen away from the edge of the rolling circle, but I don't know what it is measuring. Thank you, Paul Boisen
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Joined: Oct 2000
Posts: 5,400
Carpal Tunnel
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Carpal Tunnel
Joined: Oct 2000
Posts: 5,400 |
cool! (how did i miss this! (thanks Paul!)
i don't know the math-- but i used to make spirograph designs (using a compass) when i was a kid.. and then make color wheels.
(spin them fast enough and the paper looks white)
i also had a spirograph toy a large toothed, circle, with smaller 'gears' that you placed a pen in, and ran round the inner diameter of the large circle..
i am going to have fun making designs (and maybe learning some of the math!) with this aplet.
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Joined: Jan 2002
Posts: 1,526
veteran
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veteran
Joined: Jan 2002
Posts: 1,526 |
I'm guessing the the sign of the radius for the moving circle indicates whether you put it inside or outside the fixed circle.
The moving circle offset, I think, refers to where the pen is placed relative to the moving circle's own center.
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Joined: Jun 2002
Posts: 7,210
Carpal Tunnel
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Carpal Tunnel
Joined: Jun 2002
Posts: 7,210 |
fun! I just wasted a lot of time there...
formerly known as etaoin...
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