I'm working on a "wave terrain synthesis" sort of algorithm and I think it 
would be convenient to somehow visualize the input to the "terrain" function, 
partly just to verify that what I have made is working properly.  As an 
"intermediate level" user, I'm not really sure how to approach the problem.

What I'm looking for is a more or less real time display of x and y inputs, 
like a Lissajous figure on an oscilloscope.  I suppose it should accumulate 
data over a certain interval (the fundamental frequency of the input, so that 
it displays a complete cycle), and then display it while new data is recorded.

Any ideas, suggestions, links to appropriate reading material?  

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