Iterate over each voronoi lines

[Allakazan]

I'm making a procedural street pattern with Delaunay, and using voronoi.cellPolygons() to get each polygon. But this give me duplicated lines.

There's a way to iterate over each line separately ? Thanks !

[mbostock]

There is no method for iterating over the edges, but you can use voronoi.render to render all of the edges as a mesh, and you can look at the source if you want to access the edges directly yourself.

d3-delaunay/src/voronoi.js

Lines 75 to 101 in b7df1f2

	render(context) {
	const buffer = context == null ? context = new Path : undefined;
	const {delaunay: {halfedges, inedges, hull}, circumcenters, vectors} = this;
	if (hull.length <= 1) return null;
	for (let i = 0, n = halfedges.length; i < n; ++i) {
	const j = halfedges[i];
	if (j < i) continue;
	const ti = Math.floor(i / 3) * 2;
	const tj = Math.floor(j / 3) * 2;
	const xi = circumcenters[ti];
	const yi = circumcenters[ti + 1];
	const xj = circumcenters[tj];
	const yj = circumcenters[tj + 1];
	this._renderSegment(xi, yi, xj, yj, context);
	}
	let h0, h1 = hull[hull.length - 1];
	for (let i = 0; i < hull.length; ++i) {
	h0 = h1, h1 = hull[i];
	const t = Math.floor(inedges[h1] / 3) * 2;
	const x = circumcenters[t];
	const y = circumcenters[t + 1];
	const v = h0 * 4;
	const p = this._project(x, y, vectors[v + 2], vectors[v + 3]);
	if (p) this._renderSegment(x, y, p[0], p[1], context);
	}
	return buffer && buffer.value();
	}

[Fil]

This notebook might clarify how this can be done:
https://observablehq.com/d/045ae1b3e80973dc

[Fil]

A much simpler method is to use voronoi.render().split(/M/).slice(1)
https://observablehq.com/d/58f6cc721fa26757