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Math.atan2 Function (JavaScript)

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

Math.atan2(y, x)

x

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

y

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

The return value is between -pi and pi. It represents the angle of the supplied (y,x) point, in radians.

Applies To: Math Object (JavaScript)

Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards, Internet Explorer 11 standards. Also supported in Store apps (Windows 8 and Windows Phone 8.1). See Version Information.

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