[Gvsig_english] Field calculator::possibility to calculate x/y coordinates?

[Wolfgang Qual]

Hi Sergio,
thanks for your response. Great to hear that calculation of coordinates is 
possible for point themes. Sometimes, calculation of coorinates for polygon 
themes can be interesting, too. A colleague of me (she actually uses ArcView 
3.2 at the moment) needed that function in the past to identify polygons in 
two versions of the same theme.
I think that ArcView first calculates the centre of gravitiy of a polygon and 
than calculates the coordinates of that point. My colleague therefore used 
these coordinates to see, which polygons had changed its shape.
Therefore, my question should be a different one: is there a possibility to 
identify the centres of gravity for a polygon theme? 

Thanks in advance && best regards,
Wolfgang


Am Donnerstag 06 September 2007 pH:06:17 nachmittags/abends schrieb Sergio 
Clark:
> Hallo Wolfgang,
>
> It exist the function "x" and the function "y" in the new field
> calculator, but it is only available if you're working with a POINT type
> layer. Is this your case? These functions are "type: Numeric."
>
> Greetings,
>
> Sergio.