CFLib.org – atan2

atan2(x, y)

Last updated September 14, 2005

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Version: 1 | Requires: ColdFusion 5 | Library: MathLib

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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:

view plain print about

<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:

	
	
			
			
			
				
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				ColdFISH is developed by Jason Delmore.  Source code and license information available at coldfish.riaforge.org.  Version 3.1.1
				
			<cfscript>
/**
 * 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 (&#114;&#105;&#99;&#107;&#46;&#114;&#111;&#111;&#116;&#64;&#119;&#101;&#98;&#119;&#111;&#114;&#107;&#115;&#108;&#108;&#99;&#46;&#99;&#111;&#109;) 
 * @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)); 
}
</cfscript>
		<cfscript>
/**
 * 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)); 
}
</cfscript>