How to plot area plots

Hi,

I'm sorry I ask this non-dev question here, but I didn't know where else to ask.

I'm developping an app and I'd like to include graphics to show
evolution of a percentual variable. The best way to show this that I
can think of, is the 2D area plot of open office.

In case you can see it, I attach an example. The thing is that I can't
find the way to do this with gtk+extra. Is there any?

Thanks in advance,

Juan

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