Re: Rotating chart axis labels

[Ben Pfaff]

John Darrington <address@hidden> writes:

> I'm trying to further improve the appearance of histograms and other
> charts.  One of the problems we still have is the x-axis labels clashing
> with one another.
>
> I think a good solution would be to have them orientated at 45 deg when there
> are lots of bins.  This is  what other software does
>  (http://www.tulane.edu/~panda2/Analysis2/one-way/histog1.jpg)
>
> Pango/Cairo makes it quite easy to do this.  But I'm not sure how it would fit
> in with our existing code.  For example xrchart_label in 
> src/output/cairo-chart.c
> looks like:
>
> void xrchart_label (cairo_t *, int horz_justify, int vert_justify,
>                     double font_size, const char *);
>
> How do we express rotated text in terms of horizontal and vertical 
> justification?
> Maybe  we should generalize this interface?

I guess we'd add a new interface that includes a rotation?