CFLib.org – Common Function Library Project

atan2(x, y)

Last updated September 14, 2005

author

Rick Root

Version: 1 | Requires: CF5 | Library: MathLib

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:

Name Description Required
x First value. Yes
y Second value. Yes

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)); 
}
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