New node: Arc

[optozorax]

Closes #2434

[optozorax]

Most of the code copied from

Graphite/editor/src/messages/portfolio/document/overlays/utility_types.rs

Line 278 in 08a4b69

pub fn draw_arc(&mut self, center: DVec2, radius: f64, start_from: f64, end_at: f64) {

Tested it against circle with stroke +1px to see differences between them. Found none, seems pretty accurate.

Works for any angle from 0 to 360.

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[mTvare6]

Doesn't the ellipse part of #1715 also cover the use case of an arc. I believe implementing that would make an arc node redundant. So we shouldn't not have separate nodes.
Inkscape for reference.

[optozorax]

I don't know what #1715 does, it's not obvious from the description. @Keavon was fine with this node. Maybe something changed?

Oh, it was inside todo: Ellipse should allow dragging a handle for the X extent and Y extent and ideally creating an arc/chord. Idk. I can only add Subpath::new_arc for #1715 to implement arc behavior later.

[Keavon]

!build

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[Keavon]

I made some improvements, now it can animate with values of any range without discontinuities:

capture_66_.mp4