atan2

public static double atan2(double y, double x)

The arctangent of the quotient of the specified values. The returned value will be between -π and π (inclusive) and is expressed in radians.

Parameters

y

The first value.

x

The second value.

Returns an approximation of the arctangent of the quotient of the specified values (y/x), where the signs of the arguments y and x are used to determine the quadrant of the result.

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import System;   // Make sure you specify -0 (negative zero) as -0d. Non-floating // point types do not have a "negative zero" value or concept. Console.log(Math.atan2(0d, -0d) == Math.PI); // true Console.log(Math.atan2(0d, +0d) == 0); // true