CFLib.org – Common Function Library Project

Description:
This function calculates the arc tangent of the two variables x and y, utilizing java.lang.Math class. It is similar to calculating the arc tangent of y / x, except that the signs of both arguments are used to determine the quadrant of the result.

Return Values:
Returns a number.

Example:

<cfscript>
    c = atan2(2.5,3);
</cfscript>

<cfoutput>#c#</cfoutput>

Parameters:

Full UDF Source:

/**
 * Calculates the arc tangent of the two variables, x and y.
 * 
 * @param x      First value. (Required)
 * @param y      Second value. (Required)
 * @return Returns a number. 
 * @author Rick Root (rick.root@webworksllc.com) 
 * @version 1, September 14, 2005 
 */
function atan2(firstArg, secondArg) {    
    var Math = createObject("java","java.lang.Math");    
    return Math.atan2(javacast("double",firstArg), javacast("double",secondArg)); 
}