[PD] Drawing a sine function dynamically in Gem

[Alexandros Drymonitis]

I want to build this visual http://processing.org/learning/trig/ in Pd, but
I want the sine curve to be drawn dynamically with every circle spin. It
seems quite hard though.

I don't know which object would be best. I tried either [curve] but the
parameters are way too many and I'm not sure if precision is really
possible. Then I tried [square 0.008] in combination with [repeat] but also
doesn't work.
Anyone knows how to do this?
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