`intersects(line)` returns `[]` When one of Bessel's endpoints is on a horizontal line segment

[nxjniexiao]

Hi!

intersects(line) returns [] When one of Bessel's endpoints is on a horizontal line segment.

It is similar to #76 .

const { Bezier } = require("bezier-js");

const fromPos = [629, 340.5];
const fromPosCP = [791.875, 537.03515625];
const toPosCP = [741.75, 366.5];
const toPos = [920.75, 415.5];

const b = new Bezier([...fromPos, ...fromPosCP, ...toPosCP, ...toPos]);

const line = {
  p1: { x: 900, y: 415.5 },
  p2: { x: 950, y: 415.5 }
};

console.log(b.intersects(line)); // []

Obviously toPos is on the line, but intersects(line) returns [].

[ShaMan123]

I can reproduce When I tilt the line a bit it works but an epsilon tilt is not enough

[ShaMan123]

Ray cast using (0, 1) vector from the center of the beetle

Ray cast using (1, 50) vector from the center of the beetle

[ShaMan123]

Could it be related to the fact that it this case the intersection occurs at the min/max point of a curve?

[ShaMan123]

I think I got it wrong Will update next week with findings