[cairo] Writing a PangoLayoutLine on a line in cairo
otaylor at redhat.com
Sat Feb 3 11:59:32 PST 2007
On Sat, 2007-02-03 at 21:48 +0200, Dov Grobgeld wrote:
> In pango_cairo_show_layout() on the other hand, the layout logical
> upper left corner is aligned at the current cairo point when drawing,
> and I could not find any PangoLayout call that gets the distance from
> the top of the logical rectangle to the baseline position. Is this a
> bug, or did I miss something?
Well, one easy way to do it is to just draw the first line of the
layout instead of the entire layout - since the y origin when drawing a
single line is at the baseline of the line.
PangoLayoutLine *line = pango_layout_get_lines(layout)->data;
If you want to draw an entire layout with the first line positioned
at a particular y position, then you'd need to get the ascent of the
pango_layout_line_get_extents(line, NULL, &rect);
double ascent = (double)PANGO_ASCENT(rect) / PANGO_SCALE;
It might be handy to have a convenience function to get this -
pango_layout_get_depth(), say, to steal terminology from TeX.
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