Re: Overline for pango text?

[Stefan Salewski <mail ssalewski de>]

On Thu, 2010-09-23 at 15:15 +0200, Stefan Salewski wrote:
> Hello,
> 
> I have to draw some simple technical diagrams, I am using cairo (from
> Ruby rcairo) with interactive GTK drawing-area and PNG, PDF export.
> Currently I am using cairos toy text for text labels.
> 
> My intention was to using pango now, but there seems to be still no
> support for overline/overbar (similar to existing underline), see
> 
> http://en.wikipedia.org/wiki/Overline
> 
> Will there come support for overline in pango soon, or what is the best
> solution to fake it?
> 
OK, after some hours of research I may have a solution:

http://library.gnome.org/devel/pango/stable/pango-Layout-Objects.html#pango-layout-index-to-pos

pango_layout_index_to_pos() seems to give me a bounding box for each
character. So I can use Cairo's move_to() and line_to() functions to
draw the overbar/overline.

Best regards,

Stefan Salewski