[linux-audio-dev] Re: Which widgets?

[Albert Graef]

Jussi Laako wrote:
> For any free form rendering I use Cairo or OpenGL nowadays. Better
> performance and you get antialiased lines etc practically for free. And
> what's most important, you don't have to care about pixel coordinates or
> resolutions anymore (esp. in OpenGL).

Canvases give you much more than just rendering. They also manage the 
graphical objects that you created and, if anything changes, rerendering 
the changed parts happens automatically. Moreover, they let you inspect 
the object model of the rendered graphic. Does Cairo do that for you? 
OpenGL can do something like this with its display lists, but that's a 
very low-level abstraction compared to what canvas widgets offer.

-- 
Dr. Albert Gr"af
Dept. of Music-Informatics, University of Mainz, Germany
Email:  Dr.Graef at t-online.de, ag at muwiinfa.geschichte.uni-mainz.de
WWW:    http://www.musikinformatik.uni-mainz.de/ag