New nodes: 'Voronoi Cells', 'Tesselate', and 'Relax Points'

Cargo.toml

@@ -209,6 +209,7 @@ syn = { version = "2.0", default-features = false, features = [
 	"proc-macro",
 ] }
 lyon_geom = "1.0"
+delaunator = "1.0"
 petgraph = { version = "0.7", default-features = false, features = ["graphmap"] }
 half = { version = "2.4", default-features = false, features = ["bytemuck"] }
 tinyvec = { version = "1", features = ["std"] }

node-graph/libraries/vector-types/src/vector/vector_modification.rs

@@ -629,6 +629,10 @@ where
 	deserializer.deserialize_seq(visitor)
 }
 
+/// Distance below which a path's closing point is treated as coincident with its start point.
+/// Matches Kurbo's default path accuracy, so points within an offset operation's own precision are not split into separate anchors.
+const CLOSE_POINT_TOLERANCE: f64 = 1e-6;
+
 pub struct AppendBezpath<'a> {
 	first_point: Option<Point>,
 	last_point: Option<Point>,
@@ -657,7 +661,11 @@ impl<'a> AppendBezpath<'a> {
 	}
 
 	fn append_segment_and_close_path(&mut self, point: Point, handle: BezierHandles) {
-		let handle = if self.first_point.unwrap() != point {
+		// A path's final point may return to approximately (but not bit-exactly) its start before closing, e.g. a contour
+		// produced by Kurbo's path offsetting. Treat a near-coincident final point as already on the start so we don't
+		// introduce a redundant duplicate anchor and a zero-length closing segment.
+		let endpoints_coincide = (self.first_point.unwrap() - point).hypot2() <= CLOSE_POINT_TOLERANCE * CLOSE_POINT_TOLERANCE;
+		let handle = if !endpoints_coincide {
 			// If the first point is not the same as the last point of the path then we append the segment
 			// with given handle and point and then close the path with linear handle.
 			self.append_segment(point, handle);

node-graph/nodes/vector/Cargo.toml

@@ -24,6 +24,7 @@ repeat-nodes = { workspace = true }
 dyn-any = { workspace = true }
 glam = { workspace = true }
 kurbo = { workspace = true }
+delaunator = { workspace = true }
 rand = { workspace = true }
 rustc-hash = { workspace = true }
 log = { workspace = true }

node-graph/nodes/vector/src/lib.rs

@@ -2,6 +2,7 @@ pub mod generator_nodes;
 pub mod merge_qr_squares;
 pub mod vector_modification_nodes;
 mod vector_nodes;
+mod voronoi;
 
 #[macro_use]
 extern crate log;