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NNTP-Posting-Date: Fri, 18 Oct 2024 23:59:28 +0000
Subject: Re: The joy of Typography
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On 10/18/24 5:15 PM, Lawrence D'Oliveiro wrote:
> On Fri, 18 Oct 2024 18:44:26 GMT, Charlie Gibbs wrote:
> 
>> I wrote some routines to generate my columnar reports in PDF.
>> On the whole it worked fairly well, but I never found a way to
>> right-justify a field.  Then it became a pain in the ass.
> 
> You mean “right-align”, not “right-justify”. Here’s a routine that
> does alignment of text within a given line width, based on the current
> point, using the current font settings. It can do left-align,
> right-align, centre-align and anything in-between.
> 
>      def align_text(g, text_lines, line_width, align) :
>          "renders the sequence of text_lines horizontally-aligned within line_width according" \
>          " to align: 0 for left-aligned, 0.5 for centred, 1.0 for right-aligned; in-between" \
>          " values also allowed. Returns the bounds of the rendered text."
>          font_extents = g.font_extents
>          bounds = Rect.empty
>          for line in text_lines :
>              save_pos = g.current_point
>              extents = g.text_extents(line)
>              if align != 0 :
>                  text_width = extents.width
>                  g.rel_move_to(((line_width - text_width) * align, 0))
>              #end if
>              bounds |= Rect(extents.x_bearing, extents.y_bearing, extents.width, extents.height) + g.current_point
>              g.show_text(line)
>              g.move_to(save_pos + Vector(0, font_extents.height))
>          #end for
>          return \
>              bounds
>      #end align_text
> 
> That comes from the “text_align_justify” example in this repo
> <https://gitlab.com/ldo/qahirah_examples>.
> 

   Looks like it will work just fine.

   Wanting to confine text
      to a relatively
      small bounded box
      is not unusual at
      all. Much easier
      with fixed-point
      fonts however.

   But still, the FORTRAN "format" statement was
   created with teletypes/pin-printers/terminals
   in mind.

   I wonder how much CPU goes into nothing but
   displaying nice-looking proportional fonts
   these days ?