User Guide

416 ActionScript classes
atan2 (Math.atan2 method)
public static atan2(y:Number, x:Number) : Number
Computes and returns the angle of the point y/x in radians, when measured counterclockwise
from a circle's x axis (where 0,0 represents the center of the circle). The return value is
between positive pi and negative pi.
Availability: ActionScript 1.0; Flash Lite 2.0 - In Flash Player 4, the methods and properties
of the Math class are emulated using approximations and might not be as accurate as the non-
emulated math functions that Flash Player 5 supports.
Parameters
y:Number - A number specifying the y coordinate of the point.
x:Number - A number specifying the x coordinate of the point.
Returns
Number - A number.
Example
The following example returns the angle, in radians, of the point specified by the coordinates
(0, 10), such that x = 0 and y = 10. Note that the first parameter to atan2 is always the y
coordinate.
trace(Math.atan2(10, 0)); // output: 1.5707963267949
See also
acos (Math.acos method), asin (Math.asin method), atan (Math.atan method), cos
(Math.cos method)
, sin (Math.sin method), tan (Math.tan method)
ceil (Math.ceil method)
public static ceil(x:Number) : Number
Returns the ceiling of the specified number or expression. The ceiling of a number is the
closest integer that is greater than or equal to the number.
Availability: ActionScript 1.0; Flash Lite 2.0 - In Flash Player 4, the methods and properties
of the Math class are emulated using approximations and might not be as accurate as the non-
emulated math functions that Flash Player 5 supports.
Parameters
x:Number - A number or expression.