areaCalcsByCoords ( xlist ; ylist )
Calculates the area within any shape defined by a series of coordinates.
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where: xlist = 12 24 32 15 12
and ylist = 0 14 29 5 0
Function definition: (Copy & paste into FileMaker's Edit Custom Function window)
This function returns the area within any shape defined by X and Y coordinate lists. Another custom function is listed on this site which uses the same math technique. I'm sharing this one to demonstrate a technique I find useful. By breaking the logic into three parts - initial, final and repetitive - a CF can be used to emulate a looping behavior, much like you can do with a language like Fortran. Multiple branches can be developed which allow the CF to tackle very complex issues.
Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.