Converts point coordinates from destination coordinate system to source.
(ade_projptbackward pt)
Returns corresponding source values or nil.
| pt | Destination point to convert, a set of 2D or 3D coordinate values (real). If 3D, the Z value is ignored. |
Before you can use ade_projptbackward to convert points, you must first identify the coordinate systems that you are converting between. Use ade_projsetsrc to set the source system and ade_projsetdest to set the destination system. The ade_projptbackward function assumes that the coordinate values you pass to it belong to the destination system, and it returns corresponding source values. The ade_projptforward function does the inverse.
For more information, see Converting Coordinates.