centroid of the polygon

nidhiarora

Hi,
I want to calculate the centroid of the polygon .  I tried using Polygon.getExtent().getCenter( ) , but this fn does not return the true center , for example , if the polygon is C shaped.
Any thoughts in this aspect will be appreciated.

Regards,
Nidhi.

HemingZhu

Hi,
I want to calculate the centroid of the polygon .  I tried using Polygon.getExtent().getCenter( ) , but this fn does not return the true center , for example , if the polygon is C shaped.
Any thoughts in this aspect will be appreciated.

Regards,
Nidhi.

If the polygon is the result of a task(find, query, identify) on a map/feature service, you could add two fields (x, y) on the polygon layer and populate centroid's x and y using calculate geometry on ArcMap. So when you got the polygon, you could fetch x and y using graphic attributes["x"] and attributes["y"].  If the polygon is the result of a drawing, sorry the current JS api esri.Geometry doesn't have such method as getTrueCentroid. In this case, you might want to create a samll python script as a gp service to calculate centroid of the polyon. Because in Arcpy, Geometry does have a method like trueCentroid(or something like that-can't remember exactly). Another thought: A polyon locator will return centroid point as a result...