Draw custom shapes with audio in XY mode (to scope~, oscilloscope or laser)

Hi all,

I'm trying to display custom shapes on an oscilloscope or a laser. For both devices i need to send two audio signals to my sound card output (or to scope~ object, it's the same algorithm) in XY mode.

Basically, the shape comes from edges of a Jitter matrix (jit.robcross > jit.rgb2luma). Till now i only managed to display it on a LCD with jit.iter but i don't know if it'll be useful. I guess i need to:
- Vectorize matrix with as less different curved lines as possible
- Compute X and Y channels of this shape
- Transform X and Y channels into audio signal

Is it the right process? If yes, how to do the two first steps? Should i use OpenGL functions to vectorize shape? With an OpenGL shape, how to compute X and Y channels ?

Many thanks for your help !