Editing Scene graph (section)

==Scene graphs in graphics editing tools==
In vector-based graphics editing, each [[leaf node]] in a scene graph represents some atomic unit of the document, usually a shape such as an [[ellipse]] or [[Bezier curve|Bezier path]]. Although shapes themselves (particularly paths) can be decomposed further into nodes such as [[spline (mathematics)|spline nodes]], it is practical to think of the scene graph as composed of shapes rather than going to a lower level of representation.

Another useful and user-driven node concept is the [[2D computer graphics#Layers|layer]]. A layer acts like a transparent sheet upon which any number of shapes and shape groups can be placed. The document then becomes a set of layers, any of which can be conveniently made invisible, dimmed, or locked (made read-only). Some applications place all layers in a linear list, while others support layers within layers to any desired depth.

Internally, there may be no real structural difference between layers and groups at all, since they are both just nodes of a scene graph. If differences are needed, a common type declaration in [[C++]] would be to make a generic node class, and then derive layers and groups as subclasses. A visibility member, for example, would be a feature of a layer, but not necessarily of a group.