@jscad/modeling/src/maths/line2/direction.js

Constructive Solid Geometry (CSG) Library for JSCAD

const vec2 = require('../vec2')

/**
 * Return the direction of the given line.
 *
 * @param {line2} line - line of reference
 * @return {vec2} a vector in the direction of the line
 * @alias module:modeling/maths/line2.direction
 */
const direction = (line) => {
  const vector = vec2.normal(vec2.create(), line)
  vec2.negate(vector, vector)
  return vector
}

module.exports = direction