Ann: Simple Spirograph-like toy program.

[Dennis Brown]

Alex,

Wow!  you are quick.  Thanks!  I will have lot of fun playing around  
with that.  A phase slider is a good idea so it starts out making  
more circular patterns, and I guess the frequency sliders could be  
played with a bit --for slight frequency differences.  I will let you  
know if I come up with any good combinations.

Dennis

On Jun 18, 2005, at 8:15 PM, Alex Tweedly wrote:

> 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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