Atan2(Single, Single) Method
Returns the angle whose tangent is the quotient of two specified numbers.
public: static float Atan2(float y, float x);
public static float Atan2 (float y, float x);
static member Atan2 : single * single -> single
Public Shared Function Atan2 (y As Single, x As Single) As Single
The y coordinate of a point.
The x coordinate of a point.
An angle, θ, measured in radians, such that -π ≤ θ ≤ π, and tan(θ) =
x, where (
y) is a point in the Cartesian plane. Observe the following:
y) in quadrant 1, 0 < θ < π/2.
y) in quadrant 2, π/2 < θ ≤ π.
y) in quadrant 3, -π < θ < -π/2.
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 y is 0 and x is 0, θ = 0.
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).