Re: DiaFont abstraction and namespacing

Le Sun, Jun 23, 2002, à 03:32:23PM +0200, Hans Breuer a écrit:

Which comments ? 

"The Pango people don't seem to encounter the real world much..."

Oh ! This is not mine...
Impressive, if it wouldn't pop up about 8 message boxes with:
      Trying to set invalid font arial, helvetica, helv, sans!
      Trying to set invalid font courier new, courier, monospace, fixed!
on UML
classes; which isn't Lars' fault but some strangeness with BASIC_SANS_FONT,

Yes, I selected that, because on my system, plain "monospace" and "sans" are
flat out ugly. We should fix Lars' selector to keep only the first valid item of a
comma-separated list (Pango does this on its side).

Means dia is now hardcoded to only three families ? 
Nope. But these constants could be used for some simplifiction like

      dia_font_new_from_style(DIA_FONT_SANS | DIA_FONT_BOLD, 0.42) 

which I hope could replace the BASIC_SANS_FONT, ... above. It appears
to me that at least the win32 Pango backend isn't capable of
loading such.
Oh, I see.

With my approach there would only be one central place in font.c
where the assignment between "BASIC_*" and a real font name needs
to happen. I'm not sure if even there it is required than. Pango
should be able to give me a font from style only - without
naming it. As font info to store one would have the font name
_and_ the style as fallback.

And how do you get the specific families, then ?

What I like to get though is a - per default - shorter list
of fonts to select from. In the spirit of useability and
the ability to exchange diagrams between platforms with
differnt font sets. 
I am thinking of a GtkFifoOptionMenu with a details entry to 
select additional fonts from the standard Gtk font selector, 
to have the choice of using any font available on the system. 

Hmmm. Sounds good, then.
(there are so many
available families on my system I have to scroll through three screenfuls of
the font widget -- with 1024 dots of vertical resolution).

Is this the new kind of useability, menus about 3072 pixels long :-) ?


Some constants for the general (regular, bold, italic, bold-italic) styles
may be a useful thing to keep.

Something like ?
I'm not sure if it's worth the effort, but will do it when replacing
BASIC_*_FONT otherwise would be too much hassle.


BTW: here are some of the warnings Dia (or better Pango) spits out
if I play with uml-demo.dia (Is this your magic font scaler? :) :

** (dia.exe:4294445299): WARNING **: Couldn't load font "courier new,
courier, monospace, fixed Ultra-Light Semi-Condensed 16.8037109375" falling
back to "SansUltra-Light Semi-Condensed 16.8037109375"

Could be.

It's very possible the stretcher loop should be commented out, or made
smarter (to actually request *available* stretches; stretch in fact is a
one of the dimensions of the font face space).

        -- Cyrille


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