For reference, Processing and OpenFrameworks have solutions for this (I'm unsure how complete or fully-featured they are):

• Processing
• OpenFrameworks

Thanks for opening this @sethboyles!

If you're mostly interested in drawing the contents of a Draw instance (the type often yielded by app.draw in nannou examples), one quick approach that might be worth looking into is the Draw::triangles method.

Produce an iterator yielding all triangles from the inner mesh transformed via the inner geometry graph.

Triangles are yielded in depth-first-order of the geometry graph nodes from which they are produced.

Note: If there are any Drawings in progress, these will first be drained and completed before any vertices are yielded.

Each triangle contains the color and position data for each vertex. Perhaps these triangles can be used alongside the svg crate somehow to produce the SVG? It wouldn't produce the most optimal SVG (e.g. tessellation of all the primitives would already be performed) but it might be a good-enough work around in the meantime depending on the use case?

I agree it would be nicer to have a proper solution in the future. One thought that crosses my mind is, rather than tessellating each shape as they're drawn, we could store them as a list of commands in the Draw itself. Then this list of commands could either be rendered to a more efficient SVG path representation, or tessellated for submission to a shader, etc.

Would love to see this too.

@mitchmindtree I'm thinking of taking this on, that is the "proper solution." I'm a bit confused by your comment though after a cursory glance at the source code. Aren't the list of commands already stored in the Stateof the Draw struct?

have recently just begun looking into using nannou/rust, would also love to see this. Willing to help if possible.

The would be nice. Anyone working on this currently?

Hello all 👋

I'm very interested in SVG import / export for Nannnou.
I'm wondering if the primitive drawing actions could implement something like a "ToSVG" trait which could be chained together to produce the final output? I'm going to look into this briefly - happy to assist + test if anyone else is working on a better solution :)