Scene is a group(list) of paints.
This class is designed for vector data set which is prepared before canvas.
If a set of vector data is loaded from other resources such as files,
they can construct these data set using Scene.
This then can be pushed into canvas as one completed image.
Scene is supposed to be used in svg loading and storing to tvg specific data format(tvg)
Change-Id: Ie2ffebf74e79c59d99a77880630a54b6baad7eec
hide engine() interface of shape that's not friendly one by users.
instead canvas would access shape internal data to update/draw it.
Now Paint cannot update itself but has to request to Canvas for it.
Change-Id: Ibafd0864a65c3c33238789d1a3e06c49c4378349
PaintNode -> Paint
ShapeNode -> Shape
SceneNode -> Scene
We can keep clean and neat shorter names.
Change-Id: Ic8521d456d947985e5fbe1ba2bde06faa1f52469
introduce Canvas class to replace the CanvasBase.
now, SwCanvas, GlCanvas inherits this Canvas for polymorphism
and remove duplicated interfaces.
Change-Id: I65a87e3aa2289d04997930a54aeccd14f57dd73a
Introduce project skeleton such as build envrionment and interfaces
to build up code further cooperatively.
Change-Id: Ie9ac38991f609d33637283134906d7cc3f2ac19e
