Ann: Simple Spirograph-like toy program.

[Alex Tweedly]

Dennis Brown wrote:

> The math should just be a slider for frequency control of a sine  
> function multiplied by an initial amplitude value that is reduced  
> logarithmically with time based on a slider of friction value.  You  
> need one for each axis x,y.  It should be fun figuring out the math,  
> since you can see the results of what you are trying.  As for the  
> Coriolis force... a slider for latitude perhaps 8^)

See Revonline, alextweedly, Harmonograph  (or under Games, Harmonograph)

Simple two-pendulum harmonograph, always use a single decay rate for 
both X and Y, doesn't allow you to set phase, no colours, - so lots of 
chances to improve on it if you want.

But all controls are interactive - I had most fun by leaving the decay 
rate at 0, setting "Draw forever" and keeping the number of lines 
visible fairly small - then playing around with other values while it's 
drawing.

-- 
Alex Tweedly       http://www.tweedly.net



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