implementing new graphics toolkit

[olli]

Hello,
I would like to write a new octave graphics toolkit, which generates WebGL
output for the purpose of generating online documentation.

I have difficulties to find the detailed steps how to add a new graphics
toolkit, which a assume to be
1) subclass an abstract toolkit class
2) implement all missing methods, maybe "drawLine", "setPixel",... or more
complicated "plot2D", "plot3D", ...
3) compile new library containing this toolkit and link octave executable
against it
4) register new library in some configuration file.

Is this the right approach? If yes, 
which is the base class to extend?
which Makefile needs changes to add the new toolkit library?
how do I make the toolkit known to octave?

If this is totally wrong, I'd appreciate some hints how to get started with
a new graphics toolkit implementation. Maybe some FAQ or README file exists
already?

Thank you
Oliver



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