Re: Graph Widget Development

[Keith Williams <espian linuxinstruments com>]

You might want to take a look at the GIW library (it's hosted on 
sourceforge).   I'm not sure if it will save you any coding or not.

Also, a guy I was working with wrote a patch for GIW's x-y plot that 
utilized Cairo's anti-aliased drawing capability.  I can probably dig 
that up if you're interested.

HTH,

Keith

David Brigada wrote:
> Hello,
>
> I am currently developing an X-Y graph widget that I think could 
> someday be included in GTK+.  I'd just like to get a little bit of 
> feedback on the design so that I don't start spinning my wheels in the 
> wrong direction.  My plan is to make the usage of GtkGraph similar to 
> that of GtkTreeView---they are both widgets that can show large 
> amounts of data.
>
> The widget would be GtkGraph (analogous to GtkTreeView).  This would 
> show axes, labels and numbers on the axes, and provide the drawing 
> region to show the plots on.  On the GtkGraph widget, application 
> programmers could add GtkGraphPlot objects (similar to 
> GtkTreeViewColumn), each of which would plot a single series of data. 
> The plot objects would be connected to two things, first a 
> GtkGraphRenderer (similar to GtkCellRenderer) that would determine how 
> to plot the data on the graph, and second a GtkTreeModel (usually a 
> GtkListStore or possibly a lightweight replacement that uses an array 
> instead of a linked list for backing) that provides the data that the 
> renderer uses to generate its plots.  Each GtkGraphPlot object would 
> also hold one or more column numbers indexing into the tree model.
>
> At some point, when I'm done with a basic implementation of this, I'll 
> send an update with (a link to) the code to the list, if anyone's 
> interested in giving a brief review so that I can try to fit it better 
> to GTK+'s style.
>
> Please let me know what you think about this idea.
>
> Thanks,
> David Brigada
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