Finding centroids from shapefiles (php/mapscript)

[Ben Madin]

G'day all,

I am hoping to put lines (arrows) between polygons (to show flow). I  
was thinking of starting and ending the arrows based on the centroid  
of the polygon, but although I have found some stuff on doing this  
with PostGIS, I am using shapefiles and MSSQL Server, so my question  
is :

Can I find or calculate the centroid of a shapefile (ideally from php/ 
mapscript)?

cheers

Ben


-- 

Ben Madin

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ben at remoteinformation.com.au