Atan2

Returns the arctangent of a ratio

Syntax
   Declare Function ATan2 ( ByVal y As Double, ByVal x As Double ) As Double

Usage
   result = ATan2( y, x )

Parameters
   y
      Vertical component of the ratio.
   x
      Horizontal component of the ratio.

Return Value
   The angle whose tangent is y/x, in radians, in the range [-Pi..Pi].

Description
   ATan2 returns the arctangent of the ratio y/x as a Double within the 
   range of -Pi to Pi.  The arctangent is the inverse of the Tan function. 
   The returned angle is measured in radians (not degrees).

   ATan2 cannot be overloaded as operator to accept user-defined types.

Example
   Print Atan2 ( 4, 5 )     'this is the same as PRINT ATN ( 4 / 5 )

The output would be:

   0.6747409422235527

Differences from QB
   * New to FreeBASIC

Dialect Differences
   * Not available in the -lang qb dialect unless referenced with the 
     alias __Atan2.

See also
   * Tan
   * Atn
   * A Brief Introduction To Trigonometry

