Returns the x position of the right edge of the screen, in absolute stage coordinates.
Format: RightEdge
Arguments:
Return type: float
Error conditions: none
Notes:
This trigger is equivalent to the expression "CameraPos X + GameWidth / 2".
Example:
trigger1 = Pos X + CameraPos X > RightEdge
; Triggers if the player is to the right of the right edge of the screen.