ATan2

Returns the angle whose tangent is the quotient of two specified numbers.

Syntax

Rhino.ATan2 (dblX, dblY)

Parameters

dblX	Required. Number. The y coordinate of a point.
dblY	Required. Number. The x coordinate of a point.

Returns

Number

An angle, θ, measured in radians, such that -PI ≤ θ ≤ PI, 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 < PI/2.

For (x, y) in quadrant 2, PI/2 < θ ≤ PI.

For (x, y) in quadrant 3, -PI < θ < -PI/2.

For (x, y) in quadrant 4, -PI/2 < 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).

Null

If not successful, or on error.

Example

MsgBox Rhino.ATan2(2.0, 1.0)

Also See

ACos

ASin