freesewing/packages/examples/src/utils_curveintersectsy.js

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

  points.start = new Point(10, 45)
  points.cp1 = new Point(50, 10)
  points.cp2 = new Point(0, 80)
  points.end = new Point(110, 70)

  paths.curve = new Path().move(points.start).curve(points.cp1, points.cp2, points.end)

  for (let y of [40, 50]) {
    points['from' + y] = new Point(10, y)
    points['to' + y] = new Point(110, y)
    paths['line' + y] = new Path()
      .move(points['from' + y])
      .line(points['to' + y])
      .attr('class', 'lining dashed')
  }

  snippets.i50 = new Snippet(
    'notch',
    utils.curveIntersectsY(points.start, points.cp1, points.cp2, points.end, 50)
  )

  for (let p of utils.curveIntersectsY(points.start, points.cp1, points.cp2, points.end, 40))
    snippets[p.x] = new Snippet('notch', p)

  return part
}