Re: Canvas API proposal

[Juhana Sadeharju <kouhia nic funet fi>]

I would agree on the scenegraph as the storage of objects.

Canvas or not, I need a system which both draws objects (e.g.,
polygons) and provides interactive control of the objects.

Perhaps polygons are poor example because they make people
think GtkDrawingArea. What if I want make a slider which is
drawn with OpenGL, probably drawn and moved in 3D (e.g.,
a lever). That lever should have equally simple API as
the GTK slider has; both are widgets.

Consider a moment that the canvas would be an OpenGL only.
The canvas should have a system for simultaneous handling of
3D objects and of 2D GUI objects. Both drawn with OpenGL.
In scenegraph this would probably mean perspective and orthogonal
transformation nodes, and a drawing order node.

Juhana
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