---
title: utils.beamIntersectsLine()
---
The `utils.beamIntersectsLine()` function finds the intersection between an endless
line (beam) and a (limited) line segment. Returns a [Point](/reference/api/point) object for the
intersection, or `false` if the beam doesn't intersect the line.
The first two points in the parameter list form the beam, the last two points form the line.
## Signature
```js
Point | false utils.beamIntersectsLine(
Point beamA,
Point beamB,
Point lineA,
Point lineB
)
```
## Example
<Example caption="A Utils.beamIntersectsLine() example">
```js
({ Point, points, Path, paths, Snippet, snippets, utils, part }) => {
points.A = new Point(45, 20)
points.B = new Point(60, 15)
points.C = new Point(10, 10)
points.D = new Point(50, 40)
paths.AB = new Path().move(points.A).line(points.B).addClass('dotted')
paths.CD = new Path().move(points.C).line(points.D)
snippets.x = new Snippet(
'notch',
utils.beamIntersectsLine(points.A, points.B, points.C, points.D)
)
return part
}
```
</Example>
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