Problem with Pango size text when printing

[Joaquín Goicoechea <joaquingoicoechea iesotura es>]

Hi,

I have the next code to adapt the text size, it works fine in my custom widget:


 Pango::FontDescription fuente ("Purisa");
 m_refLayout->set_font_description (fuente); // m_refLayout is a Glib::RefPtr<Pango::Layout>
  fuente.set_size (x_f * Pango::SCALE); // int x_f = 32
   m_refLayout->set_text(msg);
   m_refLayout->get_pixel_size(x_m,y_m); // int x_m, y_m
   x_f=((ancho)*x_f)/x_m; // ancho = width, I want to use. 
   fuente.set_size (x_f*Pango::SCALE);
   ...
   m_refLayout->update_from_cairo_context(cr);  
   m_refLayout->add_to_cairo_context(cr);  
   


But when I try to print, fuente.set_size doesn't work and all the text has de same size. To do that I want, I have to set the size with FontDescription constructor:

...
  char h[10];
   sprintf (h, "%d",x_f);
   fuente_string ="Purisa "+ Glib::ustring(h);
   m_refLayout->set_font_description (Pango::FontDescription(fuente_string));
...
 

Why? 

Do you know a good Pango tutorial for beginners ?

Thanks and sorry for my English