Purpose
Returns the x-coordinate of the centroid of an object. You can call this function from the MapBasic window in MapInfo Pro.
Syntax
CentroidX( obj_expr )obj_expr is an object expression
Return Value
Float
Description
The CentroidX() function returns the X coordinate (e.g., Longitude) component of the centroid of the specified object. See the Centroid() function for a discussion of what the concept of a centroid position means with respect to different types of graphical objects (lines vs. regions, etc.).
The coordinate information is returned in MapBasic's current coordinate system; by default, MapBasic uses a Longitude/Latitude coordinate system. The Set CoordSys statement allows you to change the coordinate system used.
Examples
The following example shows how the CentroidX() function can calculate the longitude of a single geographic object.
Dim x As Float
Open Table "world"
Fetch First From world
x = CentroidX(world.obj) You can also use the CentroidX() function within the Select statement. The following Select statement extracts information from the World table, and stores the results in a temporary table called Results. Because the Select statement includes the CentroidX() function and the CentroidY() function, the Results table will include columns which display the longitude and latitude of the centroid of each country.
Open Table "world"
Select country, CentroidX(obj), CentroidY(obj)
From world Into results See Also:
Centroid() function, CentroidY() function, Set CoordSys statement