freesewing/sites/dev/docs/reference/api/utils/beamintersectsx/readme.mdx

---
title: utils.beamIntersectsX()
---

The `utils.beamIntersectsX()` function finds the intersection between an endless
line and a given X-value. Returns a [Point](/reference/api/point) object for
the intersection, or `false` there is no intersection.

## Signature

```js
Point | false utils.beamIntersectsX(Point A, Point B, float X)
```

## Example

<Example caption="A Utils.beamIntersectsX() example">
```js
({ Point, points, Path, paths, Snippet, snippets, utils, part }) => {

  points.A = new Point(10, 10)
  points.B = new Point(90, 30)

  paths.AB = new Path().move(points.A).line(points.B)

  snippets.x = new Snippet(
    "notch", 
    utils.beamIntersectsX(points.A, points.B, 40)
  )

  paths.help = new Path()
    .move(new Point(40, 5))
    .line(new Point(40, 35))
    .addClass("note dashed")

  return part
}
```
</Example>