Re: pango_layout_set_alignment not working for printing

[Behdad Esfahbod <behdad behdad org>]

On 03/29/2009 12:51 PM, Ian Puleston wrote:
> Hi,
>
> I have code that is printing Pango-formatted text, and its working fine. But
> now I have a case where I want to print some text centered, which I'm trying
> to do using pango_layout_set_alignment and I can't get that to work.
>
> At the start of the print I call gtk_print_context_create_pango_layout to
> create a PangoLayout, and then pango_layout_set_text and
> pango_layout_set_attributes to set the text and pango attributes in it. I
> then print the text line-by-line using pango_layout_get_line_readonly to
> extract the line and pango_cairo_show_layout_line to render it. This all
> works fine - I can set attributes like font size and color and they print as
> they should.
>
> So, to try to print some text centered I added a call to
> pango_layout_set_alignment(layout, PANGO_ALIGN_CENTER) on the PangoLayout
> right after setting the text and attributes in it, and that did nothing -
> the text still prints left-aligned.
>
> I also tried pango_layout_set_justify which also did nothing, and to make
> sure the layout was wide enough, added this which also made no difference:
>          gdouble pageWidth = gtk_print_context_get_width(context);
>          pango_layout_set_width(layout, pageWidth * PANGO_SCALE);
>
> Anyone got any ideas what I might be missing?

The line itself has no information about its placement.  You need to get the 
line_extents from your iterator and render the line at its logical reported 
logical x,y to get the alignment to work.

behdad



> Ian
>
>
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