PIL - font kerning

[carsn]

On Dec 23, 9:51 pm, Ivan Illarionov <ivan.illario... at gmail.com> wrote:
> On Dec 23, 11:22 pm, Ivan Illarionov <ivan.illario... at gmail.com>
> wrote:
>
>
>
> > On 23 дек, 16:44, carsn <carsten.kr... at gmail.com> wrote:
>
> > > Hey all,
>
> > > anybody know, if there´s a way to specify the kerning of a font, when
> > > you draw text withPIL?
>
> > > I´d like to achieve the same effect that you get, when you set a
> > > negative kerning in Gimp/Photshop - ie. reduce the spacing between
> > > glyphs.
>
> > > CanPILdo that or do I use another lib for that?
>
> > > Thx for any pointers & some nice xmas days to U all!
> > > carsten
>
> > No.PILcan't do that. I suggest combination of cairo/pango/pangocairo
> > (pycairo and pygtk packages).
>
> > Ivan
>
> I found a little helper function that does what you want (and more)
>
> import cairo
> import pango
> import pangocairo
>
> def draw_text(surface, context, text, font="sans 14", position=None,
> color=None,
>                             box_width=None,
> alignment=pango.ALIGN_CENTER,
>                             line_spacing=None, letter_spacing=None,
>                             extra_kerning=None):
>         if color is None:
>             color = (0.0, 0.0, 0.0)
>         context.set_source_rgb(*color)
>         pc = pangocairo.CairoContext(context)
>         layout = pc.create_layout()
>         layout.set_text(text)
>         layout.set_font_description(pango.FontDescription(font))
>         if box_width: layout.set_width(box_width)
>         layout.set_alignment(alignment)
>         if line_spacing: layout.set_spacing(spacing)
>         alist = pango.AttrList()
>         if letter_spacing:
>             alist.insert(pango.AttrLetterSpacing(letter_spacing, 0, len
> (text)))
>         if extra_kerning:
>             for pos, kern in extra_kerning.iteritems():
>                 alist.insert(pango.AttrLetterSpacing(kern, pos, pos
> +1))
>         layout.set_attributes(alist)
>         if position is None:
>             width, height = surface.get_width(), surface.get_height()
>             w, h = layout.get_pixel_size()
>             position = (width/2.0 - w/2.0, height/2.0 - h/2.0)
>         context.move_to(*position)
>         pc.show_layout(layout)
>
> And example usage:
>
> surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
> context = cairo.Context(surface)
> draw_text(surface, context, 'Hello world!',
>     font="sans 52", color=(.25,.28,.33),
>     letter_spacing=-6000,
>     extra_kerning={0:-9000, 1:-1000, 6:6000, 7:-15000, 8:5000,
> 9:-7000})
>
> surface.write_to_png("hello.png")
>
> --
> Ivan

Works great, thanks a lot!!