/math-49b311da0ed4baee4da4dd66e37ef59c.png "(x, y)")
, /math-2b4f3213ec876a15c9cf4a5577e495cc.png "atan2(y, x)")
is the angle between the positive X axis and the point . The angle is positive for counter-clockwise angles (where /math-fbb61fe7f88e12b578cc101fb3067efa.png "y > 0")
), and negative for clockwise angles (where /math-c1f0229c2957e4090fbbb490946c3ea8.png "y < 0")
). The result angle range is ![(-\pi , \pi ]](../images/Atan2_(function)/math-4d739b4aa9ebde72ac573c38bc0178ba.png "(-\pi , \pi ]")
, and for both x and y are zeroes, /math-e17be6153923b7a09415a32ab1ea5e28.png "atan2(0, 0) = 0")
.
The atan2 function is a variation of the atan function. For a given coordinates , is the angle between the positive X axis and the point . The angle is positive for counter-clockwise angles (where ), and negative for clockwise angles (where ). The result angle range is , and for both x and y are zeroes, .
Returned values are in radians, degrees or gradians, depending upon the system.math.angularunits object property (which can also be set in the Options dialog box).
double Atan2(double y, double x)
y
.x
.Return the angle between the positive X axis and the point given by the coordinates .
atan2(4, 3) = ; // 0.92729521800161 atan2(0, -1) = ; // 3.1415926535898 atan2(0, 0) = ; // 0 atan2(-1, -1) = ; // -2.3561944901923