1mode_setup; 2 em#:=10pt#; cap#:=7pt#; 3 thin#:=1/3pt#; thick#:=5/6pt#; 4 o#:=1/5pt#; 5define_pixels(em,cap); 6define_blacker_pixels(thin,thick); 7define_corrected_pixels(o); 8 curve_sidebar=round 1/18em; 9beginchar("O",0.8em#,cap#,0); "The letter O"; 10 penpos1(thick,10); penpos2(.1[thin,thick],90-10); 11 penpos3(thick,180+10); penpos4(thin,270-10); 12 x1l=w-x3l=curve_sidebar; x2=x4=.5w; 13 y1=.49h; y2l=-o; y3=.51h; y4l=h+o; 14 penstroke z1e{down}..z2e{right} 15 ..z3e{up}..z4e{left}..cycle; 16 penlabels(1,2,3,4); endchar; 17def test_I(expr code,trial_stem,trial_width) = 18 stem#:=trial_stem*pt#; define_blacker_pixels(stem); 19 beginchar(code,trial_width*em#,cap#,0); "The letter I"; 20 penpos1(stem,15); penpos2(.9stem,12); penpos3(stem,10); 21 x1=x2=x3=.5w; y1=h; y2=.55h; y3=0; x2l:=1/6[x2l,x2]; 22 penstroke z1e..z2e{down}..z3e; 23 penlabels(1,2,3); endchar; enddef; 24