ActionScript for Flash MX: The Definitive Guide, Second Edition

ActionScript for Flash MX: The Definitive Guide, 2nd EditionBy Colin Moock
Chapter 18.  ActionScript Language Reference
Math.atan( ) Method Flash 5; may be used when exporting Flash 4 movies
compute the arc tangent of a number

Math.atan(x)

Arguments

x

A number between -Infinity and Infinity, inclusive (the tangent of some angle).

Returns

The angle, in radians, whose tangent is x.

Description

The arc tangent function (sometimes written as tan-1) is the inverse of the tangent function. It returns the angle whose tangent has the specified value, in radians. The return value is in the range of -/2 to /2.

Example

trace (Math.atan(1.0)); // Displays: 0.78539... trace (Math.atan(0.0)); // Displays: 0 trace (Math.atan(-Infinity)); // Displays: -1.5707... (i.e., -pi/2)

See Also

Math.acos( ), Math.asin( ), Math.tan( )

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