freesewing/packages/examples/src/utils_curveintersectsx.js

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

  points.start = new Point(10, 15)
  points.cp1 = new Point(80, 10)
  points.cp2 = new Point(-50, 80)
  points.end = new Point(110, 70)

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

  for (let x of [30, 40]) {
    points['from' + x] = new Point(x, 10)
    points['to' + x] = new Point(x, 80)
    paths['line' + x] = new Path()
      .move(points['from' + x])
      .line(points['to' + x])
      .attr('class', 'lining dashed')
  }

  snippets.i40 = new Snippet(
    'notch',
    utils.curveIntersectsX(points.start, points.cp1, points.cp2, points.end, 40)
  )

  for (let p of utils.curveIntersectsX(points.start, points.cp1, points.cp2, points.end, 30))
    snippets[p.y] = new Snippet('notch', p)

  return part
}