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Check whether a point is invalid.
Source position: classesh.inc line 2094
| function InvalidPoint( | 
| X: Integer; | 
| Y: Integer | 
| ):Boolean; | 
| const At: TPoint | 
| ):Boolean; | 
| const At: TSmallPoint | 
| ):Boolean; | 
InvalidPoint returns True if the X and Y coordinates (of the TPoint or TSmallPoint records, if one of these versions is used) are -1.
| 
 | Special type to handle a fake TComponent position | |
| 
 | Type to describe point in a small plane. | |
| 
 | Check whether two TPoint variables are equal. |