Re: Rotating chart axis labels

[John Darrington]

On Tue, May 08, 2012 at 06:45:59AM -0700, Ben Pfaff wrote:
     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?

You mean just a new argument giving the number of degrees to rotate?  Or do you 
want to 
replace the existing interface?  Would the rotation occur before or after 
"justification"?
About which point does it get rotated?

J'

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