EVENT UPDATESCREENAREA
EVENT_UPDATESCREENAREA is a Misc Event.
This event is triggered whenever the visible game area is updated. Use this event to change the size of the game view, similar to when you press + or -
See screenarea_x1, screenarea_y1, screenarea_x2, screenarea_y2.
The struct members ud.return[0] to ud.return[3] hereby store x1, y1, x2 and y2 in sequence. Alter the values stored in these variables in order to change the screen area.