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("x", p);

  return part;
};