Re: The joy of Typography

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>.