Line-intersect NPM

line-intersect

Line vs line, point vs line in 2D space

Math is mostly from here.

npm install line-intersect

es modules

import {
  checkIntersection,
  colinearPointWithinSegment
} from 'line-intersect';

commonjs modules

const {
  checkIntersection,
  colinearPointWithinSegment
} = require('line-intersect');

Given a line segment from (x1, y1) to (x2, y2) and line segment from (x3, y3) to (x4, y4), check if the line segments intersect.

All params are Numbers and are required.

A read-only Object that looks like

{
  type: 'none' | 'parallel' | 'colinear'
}

// or

{
  type: 'intersecting',
  point: {
    x: number,
    y: number
  }
}

point is only exists when type == 'intersecting'

`type`	What it means	Are the line segments touching?
none	Line segments are not intersecting	No
parallel	Line segments are not intersecting but they are parallel to eachother	No
colinear	Line segments are on the same line and may be overlapping. Use `colinearPointWithinSegment()` to check	Maybe
intersecting	Line segments intersect at exactly one point	Yes