Designing Games with Game Maker - YoYo Games

can also assign an instance id to this variable. In that case the particular
instance is followed.
Note that the size of the image on the screen is decided based on the visible views at the
beginning of the room. If you change views during the game, they might no longer fit on the
screen. The screen size though is not adapted automatically. So if you need this you have to
do it yourself, using the following functions:
window_set_region_size(w,h,adaptwindow) Set the width and height
of the drawing region in the window. adaptwindow indicates whether the
window size must be adapted if the region does not fit in. The window size will
always be adapted if you use fixed scaling. (See the function
window_set_region_scale().)
window_get_region_width() Returns the current width of the drawing
region.
window_get_region_height() Returns the current height of the drawing
region.
In a game you often need the position of the mouse cursor. Normally you use for this the
variables mouse_x and mouse_y. When there are multiple views, these variables give the
mouse position with respect to the view the mouse is in. Sometimes though, you might need
the mouse position with respect to a particular view, also when it is outside that view. For this
the following functions exist.
window_view_mouse_get_x(id) Returns the x-coordinate of the mouse
with respect to the view with index id.
window_view_mouse_get_y(id) Returns the y-coordinate of the mouse
with respect to the view with index id.
window_view_mouse_set(id,x,y) Sets the position of the mouse with
respect to the view with index id.
window_views_mouse_get_x() Returns the x-coordinate of the mouse with
respect to the view it is in (same as mouse_x).
window_views_mouse_get_y() Returns the y-coordinate of the mouse with
respect to the view it is in (same as mouse_y).
window_views_mouse_set(x,y) Sets the position of the mouse with
respect to the first view that is visible.