JavaScript tutorial:
atan2 method

 

Applies to: Math Object

The atan2 method is use to get the angle (in radians) from the X axis to a point (y,x).

Syntax

Math.atan2(y, x)

The atan2 method syntax has these parts:

Part

Description

Math

Required. Invokes the intrinsic Math object.

x

Required. A numeric expression representing the cartesian x-coordinate.

y

Required. A numeric expression representing the cartesian y-coordinate.

Return value

Returns the angle (in radians) from the X axis to a point (y,x).

Example

The return value is between -pi and pi, representing the angle of the supplied (y,x) point.

See also: atan Method, Math Object Methods, tan Method