Designing Games with Game Maker - YoYo Games

window_default() Gives the window the default size and position
(centered) on the screen.
window_get_x() Returns the current x-coordinate of the window.
window_get_y() Returns the current y-coordinate of the window.
window_get_width() Returns the current width of the window.
window_get_height() Returns the current height of the window.
Again, you probably never want to use any of the window positioning functions as Game
Maker takes care of these automatically.
In rare cases you might want to know the position of the mouse with respect to the window.
(Normally you always use the mouse position with respect to the room or with respect to a
view.) The following functions exist for this.
Views
window_mouse_get_x() Returns the x-coordinate of the mouse in the
window.
window_mouse_get_y() Returns the y-coordinate of the mouse in the
window.
window_mouse_set(x,y) Sets the position of the mouse in the window to
the indicated values.
As you should know you can define up to eight different views when designing rooms. A view
is defined by its view area in the room and its viewport on the screen (or to be precise in the
drawing region within the window). Using views you can show different parts of the room at
different places on the screen. Also, you can make sure that a particular object always stays
visible.
You can control the views from within code. You can make views visible and invisible and
change the place or size of the views in the drawing region or the position and size of the view
in the room (which is in particular useful when you indicate no object to be visible). You can
change the size of the horizontal and vertical border around the visible object, and you can
indicate which object must remain visible in the views. The latter is very important when the
important object changes during the game. For example, you might change the main
character object based on its current status. Unfortunately, this does mean that it is no longer