freesewing/markdown/dev/reference/api/path/intersectsy/en.md

title
intersectsY()

array|false path.intersectsY(float y)

Returns the Point object(s) where the path intersects with a given Y-value.

Example of the Path.intersectsY() method

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);
}