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[This documentation is for preview only, and is subject to change in later releases. Blank topics are included as placeholders.]
Returns the angle whose tangent is the quotient of two specified numbers.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Shared Function Atan2 ( _
y As Double, _
x As Double _
) As Double
public static double Atan2(
double y,
double x
)
public:
static double Atan2(
double y,
double x
)
static member Atan2 :
y:float *
x:float -> float
public static function Atan2(
y : double,
x : double
) : double
Parameters
- y
Type: System. . :: . .Double
The y coordinate of a point.
- x
Type: System. . :: . .Double
The x coordinate of a point.
Return Value
Type: System. . :: . .Double
An angle, θ, measured in radians, such that -π≤θ≤π, and tan(θ) = y / x, where (x, y) is a point in the Cartesian plane. Observe the following:
For (x, y) in quadrant 1, 0 < θ < π/2.
For (x, y) in quadrant 2, π/2 < θ≤π.
For (x, y) in quadrant 3, -π < θ < -π/2.
For (x, y) in quadrant 4, -π/2 < θ < 0.
For points on the boundaries of the quadrants, the return value is the following:
If y is 0 and x is not negative, θ = 0.
If y is 0 and x is negative, θ = π.
If y is positive and x is 0, θ = π/2.
If y is negative and x is 0, θ = -π/2.
If x or y is NaN, or if x and y are either PositiveInfinity or NegativeInfinity, the method returns NaN.
Remarks
The return value is the angle in the Cartesian plane formed by the x-axis, and a vector starting from the origin, (0,0), and terminating at the point, (x,y).
.NET Framework Security
- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see dd66cd4c-b087-415f-9c3e-94e3a1835f74.