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prologues := 3;     % sortie EPS

%mode_setup;

% parameters
em#:=10pt#; cap#:=7pt#;
thin#:=1/3pt#; thick#:=5/6pt#;
o#:=1/5pt#;  % overshoot 
%define_pixels(em,cap);
%define_blacker_pixels(thin,thick);

% letter O
%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;

% letter I
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(stem,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;

end