CFLib.org – Common Function Library Project

CoMidpoint(x1, y1, x2, y2)

Last updated July 17, 2001

author

Rob Brooks-Bilson

Version: 1 | Requires: CF5 | Library: MathLib

Description:
Returns the coordinates of the midpoint between two points on a line on the Cartesian coordinate system.

Return Values:
Returns a string

Example:

<CFSET x1=1>
  <CFSET y1=5>
  <CFSET x2=1>
  <CFSET y2=-5>
  <CFOUTPUT>
  Given:
  <UL>
  <LI>x1,y1 = (1,5)
  <LI>x2,y2 = (1,-5)
  </UL>
  The midpoint between (#x1#,#y1#) and (#x2#,#y2#) = (#CoMidpoint(x1,y1,x2,y2)#)
  </CFOUTPUT>

Parameters:

Name Description Required
x1 x position of the first point Yes
y1 y position of the first point Yes
x2 x position of the second point Yes
y2 y position of the second point Yes

Full UDF Source:

/**
 * Returns the coordinates of the midpoint between two points on a line.
 * 
 * @param x1 	 x position of the first point 
 * @param y1 	 y position of the first point 
 * @param x2 	 x position of the second point 
 * @param y2 	 y position of the second point 
 * @return Returns a string 
 * @author Rob Brooks-Bilson (rbils@amkor.com) 
 * @version 1.0, July 17, 2001 
 */
function CoMidpoint(x1,y1,x2,y2)
{
  Return (x1+x2)/2 & ',' & (y1+y2)/2;
}
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