freesewing/packages/examples/src/path_intersectsy.js

export default part => {
  let { Point, points, Path, paths, Snippet, snippets } = part.shorthand()

  points.A = new Point(55, 40)
  points.B = new Point(10, 70)
  points.BCp2 = new Point(40, 20)
  points.C = new Point(90, 60)
  points.CCp1 = new Point(50, -30)
  points.D = new Point(50, 80)
  points.DCp1 = new Point(140, 50)

  points.top = new Point(10, 58)
  points.bot = new Point(130, 58)

  paths.line = new Path()
    .move(points.top)
    .line(points.bot)
    .attr('class', 'lining dashed')

  paths.demo = new Path()
    .move(points.A)
    .line(points.B)
    .curve(points.BCp2, points.CCp1, points.C)
    .curve(points.DCp1, points.DCp1, points.D)
  for (let p of paths.demo.intersectsY(58)) {
    snippets[part.getId()] = new Snippet('notch', p)
  }

  return part
}