Vector rendering design updated

[Cameron Shorter]

I've updated the Vector Rendering design at:
http://wiki.osgeo.org/index.php/AJAX_WebMapping_Vector_Rendering_Design

Key changes:
* There is one graphics/Canvas class which creates all graphic objects 
(SVG/VML/etc).

* This means that we don't need a Renderer for each target platform. The 
Renderer just calls the one Canvas class to create shapes.

* I've created a StyledGeometry concept for storing features.

* I've changed some of the names of files to align with the GO-1 naming 
convention. (as I understand it).

There are still more details we can work out - but they would probably 
be best to work out during implementation.

Comments welcome.

Other news:
===========
* Chris Thorne is interested to use implement X3D rendering. (3D 
rendering which can be installed into a browser as a pluggin). Some info 
at http://planet-earth.org/


-- 
Cameron Shorter
http://cameron.shorter.net