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