`MouseMove A_ScreenWidth, A_ScreenHeight` loses precision

Question

Quote from the documentation:

A_ScreenWidth, A_ScreenHeight: The width and height of the primary monitor, in pixels (e.g. 1024 and 768).

I expected the following code to move the cursor tip at the right bottom of the screen, for example, if the screen's resolution is 1920 x 1080, then the cursor tip should be moved to (1920, 1080), but in reality, the cursor tip was moved to (1919, 1079), does anyone know why?

CoordMode Mouse

MouseMove A_ScreenWidth, A_ScreenHeight

Answer 1

The reason is that the coodinates start from (0, 0) instead of (1, 1), therefore (0, 0) to (1919, 1079), not (1, 1) to (1920, 1080).