Re: getting extents of individual words in a layout

On Tue, 2008-02-19 at 22:33 +0100, Theo Veenker wrote:
> Hi,
> I need to know the extents of the individual 'words' in a layout
> object (for an eye-tracking experiment). I want to draw a rectangle
> around each word (in cairo) and also output the extents of each
> word numerically.
> Using an PangoLayoutIter I can walk over the layout lines and see
> each character/grapheme but I how do I relate the current iterator
> position to an index in the text? I need that in order to be able
> to detect spacing characters between the words.
> I also toyed with pango_layout_get_lines_readonly() and worked down
> to the actual glyphitems but that seems rather tedious.

You are on the right track.  What's missing is an API to iterate over
glyphitems.  That code exists in Pango internally.  See:

It's pretty short.  I suggest you copy/paste it for now.

When you get back to character offsets, you can use
pango_get_log_attrs() results to find word boundaries, etc.

> What would be the proper way to approach this?
> Thanks,
> Theo


"Those who would give up Essential Liberty to purchase a little
 Temporary Safety, deserve neither Liberty nor Safety."
        -- Benjamin Franklin, 1759

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