Background is the area where every sprites lived. A background has a view area/view port/clipping area, that is the area which is seen to the player. By default the view area of a newly created background is as big as game dimension. For example if the game is created as big as 640 x 480 dimension, the background view area would be also 640 x 480, thus occupy all the game view. To set the background view area, use {@linkplain #setClip(int,int,int,int) setClip(x, y, width, height)}.
If the background size is larger than view area, means there is area not viewable, use {@linkplain #move(double,double) move(dx, dy)} or{@linkplain #setLocation(double,double)} to move around.
To set a sprite to be the center of the background, use {@linkplain #setToCenter(Sprite)}. @see com.golden.gamedev.object.background
The set of nodes that can be added to a BranchGroup associated with a Background node is limited. All Group nodes except ViewSpecificGroup are legal in a background geometry branch graph. The only Leaf nodes that are legal are Shape3D (except OrientedShape3D), Morph, Light, and Fog. The presence of any other Leaf node, including OrientedShape3D, or of a ViewSpecificGroup node will cause an IllegalSceneGraphException to be thrown. Note that Link nodes are not allowed; a background geometry branch graph must not reference shared subgraphs. NodeComponent objects can be shared between background branches and ordinary (non-background) branches or among different background branches, however.
Light and Fog nodes in a background geometry branch graph do not affect nodes outside of the background geometry branch graph, and vice versa. Light and Fog nodes that appear in a background geometry branch graph must not be hierarchically scoped to any group node outside of that background geometry branch graph. Conversely, Light and Fog nodes that appear outside of a particular background geometry branch graph must not be hierarchically scoped to any group node in that background geometry branch graph. Any attempt to do so will be ignored.
The influencing bounds of any Light or Fog node in a background geometry branch graph is effectively infinite (meaning that all lights can affect all geometry objects nodes within the background geometry graph, and that an arbitrary fog is selected). An application wishing to limit the scope of a Light or Fog node must use hierarchical scoping.
Picking and collision is ignored for nodes inside a background geometry branch graph.
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