Gets the absolute screen position of the position specified relative to the panel.
See also Panel:ScreenToLocal.
This function uses a cached value for the screen position of the panel, computed at the end of the last VGUI Think/Layout pass.
ie. inaccurate results may be returned if the panel or any of its ancestors have been repositioned outside of PANEL:Think or PANEL:PerformLayout within the last frame.
If the panel uses Panel:Dock, this function will return 0, 0 when the panel was created. The position will be updated in the next frame.
The X coordinate of the position on the panel to translate.
The Y coordinate of the position on the panel to translate.
The X coordinate relative to the screen.
The Y coordinate relative to the screen.