reverse = (out, line) => {
  const normal = vec2.negate(vec2.create(), line)
  const distance = -line[2]
  return copy(out, fromValues(normal[0], normal[1], distance))
}
Create a new line in the opposite direction as the given.

@param {line2} out - receiving line
@param {line2} line - line to reverse
@returns {line2} out
@alias module:modeling/maths/line2.reverse