ControlPointInfo() function - MapBasic - 2023

Purpose:

Returns raster and geographic control point coordinates for an image table. The geographic coordinates will be in the current MapBasic coordinate system.

Syntax:

ControlPointInfo( table_id, attribute, controlpoint_num ) 

table_id is a string representing a table name, a positive integer table number, or 0 (zero). The table must be a raster, grid or WMS table.

attribute is an integer code indicating which aspect of the control point to return.

controlpoint_num is the integer number of which control point to return. Control point numbers start at 1. The maximum control point number can be found by calling

RasterTableInfo(table_id, RASTER_TAB_INFO_NUM_CONTROL_POINTS)

Return Value

The X or Y raster coordinate is returned as an Integer. The X or Y geographic coordinate is returned as a Float. The return type depends upon the attribute flag, for the control point specified by controlpoint_num.

The attribute parameter can be any value from the table below. Codes in the left column (for example, RASTER_CONTROL_POINT_X) are defined in MAPBASIC.DEF.