Window coordinates vs drawing coordinates

[bvssvni]

The problem is that a single position is ambiguous, it does not tell you whether the input is in window coordinates, drawing coordinates or something else.

[bvssvni]

One solution could be to provide a rectangle or size for every mouse cursor position which told where it was relative to the rectangular surface.

[bvssvni]

Another solution is to add a Pointer(x, y) which is normalized to the rectangular area of the receiver of the input.