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JavaScript atan2() Method

Math Object Reference JavaScript Math Object

Example - atan2(y,x)

Assume you had a point with the (x,y) coordinates of (4,8), you could calculate the angle in radians between that point and the positive X axis as follows:

Math.atan2(8, 4);

The output of the code above will be:

1.1071487177940904


Try it yourself »



Definition and Usage

The atan2() method returns the arctangent of the quotient of its arguments, as a numeric value between PI and -PI radians.

The number returned represents the counterclockwise angle in radians (not degrees) between the positive X axis and the point (x, y).

Note: With atan2(), the y coordinate is passed as the first argument and the x coordinate is passed as the second argument.


Browser Support

Internet Explorer Firefox Opera Google Chrome Safari

The atan2() method is supported in all major browsers.


Syntax

Math.atan2(y,x)

Parameter Description
y Required. A number representing the y coordinate
x Required. A number representing the x coordinate

Return Value

Type Description
Number A Number, from PI to -PI, or NaN if the value(s) are empty

Technical Details

JavaScript Version: 1.0


Math Object Reference JavaScript Math Object

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