Re: dvilj Font Basics?

On 23 Nov 2004, Thomas Esser wrote:
> On Tue, Nov 23, 2004 at 02:15:51PM -0800, Walker Pendleton wrote:
>> /var/cache/fonts/tfm/local/io/io.tfm, and I put io.2600pk in
> ...
>> But dvilj4 doesn't seem to find the io.2600pk file, and I don't
>> know
>
> dvilj4 works with 600dpi. So, I guess that you should generate your io
> font for mode ljfour, not proofmode.
>
> Thomas

My mistake: typo in the email.  The pk file is actually named
"io.2400pk".  In the exercise, calls for mode "localfont", and
"mag=4".  "\mode=ljfour" also produces these "io.2400pk" files,
because 600 * 4 = 2400.

Allow me to explain Knuth's exercise:

The io.mf file from the exercise seems to be included in teTeX's own
texmf/metafont/base/io.mf file.  Knuth instructs you to type a bit
more at the terminal, so you end up with:

    %this first line entered on the terminal:
    \mode=localfont; mag=4; % and then "input io.mf"
    mode_setup;
     em#:=10pt#; cap#:=7pt#;
     thin#:=1/3pt#; thick#:=5/6pt#;
     o#:=1/5pt#;
    define_pixels(em,cap);
    define_blacker_pixels(thin,thick);
    define_corrected_pixels(o);
     curve_sidebar=round 1/18em;
    beginchar("O",0.8em#,cap#,0); "The letter O";
     penpos1(thick,10); penpos2(.1[thin,thick],90-10);
     penpos3(thick,180+10); penpos4(thin,270-10);
     x1l=w-x3l=curve_sidebar; x2=x4=.5w;
     y1=.49h; y2l=-o; y3=.51h; y4l=h+o;
     penstroke z1e{down}..z2e{right}
                ..z3e{up}..z4e{left}..cycle;
     penlabels(1,2,3,4); endchar;
    def test_I(expr code,trial_stem,trial_width) =
     stem#:=trial_stem*pt#; define_blacker_pixels(stem);
     beginchar(code,trial_width*em#,cap#,0); "The letter I";
      penpos1(stem,15); penpos2(.9stem,12); penpos3(stem,10);
      x1=x2=x3=.5w; y1=h; y2=.55h; y3=0; x2l:=1/6[x2l,x2];
      penstroke z1e..z2e{down}..z3e;
      penlabels(1,2,3); endchar; enddef;
    % Here's the terminal-entered bit
    code=100;
    for s=7 upto 10:
     for w=5 upto 8:
      test_I(incr code,s/10,w/20);
    endfor endfor end.

And then you start "tex", & have a conversation with it, at the
terminal, which goes something like:

    [TeX prompts with "**"]testfont
    [TeX chats, you type:]
    io scaled 4000
    [TeX prompts with "*"]\mixture
    [TeX asks for "background character"]O
    [TeX asks for "starting character"]e
    [TeX asks for "ending character"]t
    [TeX prompts with "*"]\end

...which then leaves you with a testfont.dvi that I can't print with
dvilj.