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

title
Path.angleAt()

The Path.angleAt() method returns the (tangent) angle of a path at a specific point.

If the given point is a sharp corner, this method prefers returning the angle directly before the corner.

If the given point does not lie (approximately) on the path, this method returns false.

Signature

number|false path.angleAt(Point point)

Example

```js ({ Point, points, Path, paths, snippets, Snippet, part }) => {

points.A = new Point(45, 60) points.B = new Point(10, 30) points.BCp2 = new Point(40, 20) points.C = new Point(90, 30) points.CCp1 = new Point(50, -30) points.D = new Point(50, 80) points.DCp1 = new Point(70, 30)

paths.demo = new Path() .move(points.D) .curve(points.DCp1, points.DCp1, points.C) .curve(points.CCp1, points.BCp2, points.B) .line(points.A)

points.testPoint = paths.demo.shiftFractionAlong(0.55) snippets.point = new Snippet("notch", points.testPoint)

let angle = paths.demo.angleAt(points.testPoint) //draw a tangent path paths.tangent = new Path() .move(points.testPoint.shift(angle, -30)) .line(points.testPoint.shift(angle, 30)) .attr("class", "lining dashed")

return part }

</Example>
                               
## Notes

Keep in mind that calculations with Bézier curves are often approximations.