---
title: utils.beamIntersectsCircle()
---

The `utils.beamIntersectsCircle()` function finds the intersection between an
endless line through points `point1` and `point2` and a circle with its center
at point `center` and a radius of `radius` mm.

## Signature

```js
array | false utils.beamIntersectsCircle(
  Point center, 
  float radius, 
  Point point1, 
  Point point1, 
  string sort=x
)
```

The 5th and last parameter controls the _sorting_ of the found intersections.
This will (almost) always return 2 intersections, and you can choose how
they are ordered in the returned array:

Set sort to:

- `x` : The point with the lowest X-coordinate will go first (left to right)
- `y` : The point with the lowest Y-coordinate will go first (top to bottom)

## Example

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

  points.A = new Point(45, 45)
    .addCircle(35, "Fabric")
  points.B = new Point(5, 50)
  points.C = new Point(25, 30)
  points.D = new Point(5, 65)
  points.E = new Point(65, 5)
  points.F = new Point(15, 75)
  points.G = new Point(75, 15)
  
  paths.line1 = new Path().move(points.B).line(points.C)
  paths.line2 = new Path().move(points.D).line(points.E)
  paths.line3 = new Path().move(points.F).line(points.G)
  
  let intersections1 = utils.beamIntersectsCircle(
    points.A,
    points.A.attributes.get("data-circle"),
    points.B,
    points.C
  )
  let intersections2 = utils.beamIntersectsCircle(
    points.A,
    points.A.attributes.get("data-circle"),
    points.D,
    points.E,
    "y"
  )
  let intersections3 = utils.beamIntersectsCircle(
    points.A,
    points.A.attributes.get("data-circle"),
    points.F,
    points.G
  )
  
  snippets.first1 = new Snippet("bnotch", intersections1[0])
  snippets.second1 = new Snippet("notch", intersections1[1])
  snippets.first2 = new Snippet("bnotch", intersections2[0])
  snippets.second2 = new Snippet("notch", intersections2[1])
  snippets.first3 = new Snippet("bnotch", intersections3[0])
  snippets.second3 = new Snippet("notch", intersections3[1])

  return part
}
```
</Example>