Designing Games with Game Maker - YoYo Games

with the indicated index.
room_set_background_color(ind,col,show) Sets the color properties
for the room with the indicated index if is does not have a background image.
col indicates the color and show indicates whether the color must be shown or
not.
room_set_background(ind,bind,vis,fore,back,x,y,htiled,vtile
d,hspeed,vspeed,alpha) Sets background with index bind (0-7) for the
room with the indicated index. vis indicates whether the background is visible
and fore whether it is actually a foreground. back is the index of the
background image. x,y indicate the position of the image and htiled and vtiled
indicate whether the image must be tiled. hspeed and vspeed indicate the
speed with which the background moves and alpha indicates an alpha
translucency value (1 = solid and fastest).
room_set_view(ind,vind,vis,xview,yview,wview,hview,xport,yp
ort,wport,hport,hborder,vborder,hspeed,vspeed,obj) Sets the
view with index vind (0-7) for the room with the indicated index. vis indicates
whether the view is visible. xview, yview, wview, and hview indicate the
position of the view in the room. xport, yport, wport, and hport indicate the
position on the screen. When the view must follow an object hborder and
vborder indicate the minimal visible border that must be kept around the
object. hspeed and vspeed indicate the maximal speed with which the view
can move. obj is the index of the object or the index of the instance.
room_set_view_enabled(ind,val) Sets whether views must be enabled
for the room with the indicated index.
room_add() Adds a new room. It returns the index of the room. Note that the
room will not be part of the room order. So the new room does not have a
previous or a next room. If you want to move to an added room you must
provide the index of the room.
room_duplicate(ind) Adds a copy of the room with the given index. It
returns the index of the room.
room_assign(ind,room) Assigns the indicated room to room ind. So this
makes a copy of the room.
room_instance_add(ind,x,y,obj) Adds a new instance of object obj to
the room, placing it at the indicate position. It returns the index of the
instance.
room_instance_clear(ind) Removes all instances from the indicated