Fast segment 2D intersection, that includes edge cases, such as segments touching points, or one segment being on top of the other.

import { intersection, findIntersection } from 'segment-intersection';

const isect = findIntersection(x0, y0, x1, y1, x2, y2, x3, y3);
console.log(isect); // 0, 1 or 2
console.log(intersection); // [[x, y], [x, y]]

• isect === 0 means the segments do not intersect.
• isect === 1 your intersection point is intersection[0].
• isect === 2 your segments are overlapping and you have 2 intersection points, intersection[0] and intersection[1].

Also, you can write into an existing array:

import { findIntersection } from 'segment-intersection';
const intersection = [
  [0, 0],
  [0, 0],
];
const isect = findIntersection(x0, y0, x1, y1, x2, y2, x3, y3, intersection);

-  segment-intersection x 12,139,495 ops/sec ±0.81% (88 runs sampled)
 -  exact-segment-intersect x 1,149,191 ops/sec ±2.38% (89 runs sampled)
 -  segseg x 5,492,533 ops/sec ±4.01% (86 runs sampled)

npm run dev

npm run demo

npm run build

npm run lint

npm run test

npm run test:watch

npm run coverage

MIT License

Copyright (c) Alex Milevski (@w8r)