[cairo] Drawing graphs

[Richard Henwood]

James Allsopp wrote:

> Hi,
> Sorry for the newbieness of this, but I'm trying to find out where to
> start. I need a way of producing graphs of data held in a c++ program,
> so that when a cursor is held over a square region/pixel  in a 2-d map
> plot a graph will appear in a separate window. Another problem is the
> data is vast ~500Mb, and it needs to be fast. I'm just wondering if
> there are some good guides, if this is actually possible, and if there
> are any existing projects which would save me a lot of effort! I'd like
> it run on linux box using gnome, if at all possible.
> 
> Thanks for any help/suggestions!

Have you tried Gnuplot? 

richard