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\documentclass{article}
\usepackage{luamplib}
\everymplib{ beginfig(0); }
\everyendmplib{ endfig; }
\begin{document}
\tracingcommands1
A%
\begin{mplibcode}
%% test all printable ascii chars in comments
%% ( 2 < F P Z d n x
%% ) 3 = G Q [ e o y
%% * 4 > H R \ f p z
%% ! + 5 ? I S ] g q {
%% " , 6 @ J T ^ h r |
%% # - 7 A K U _ i s }
%% $ . 8 B L V ` j t ~
%% % / 9 C M W a k u DEL
%% & 0 : D N X b l v
%% ´ 1 ; E O Y c m w
fill fullcircle scaled 20; %% actual <tab> to make sure it works
\end{mplibcode}%
B\par
\everymplib{}\everyendmplib{}% reset toks
A%
\begin{mplibcode}
verbatimtex \lower.2em etex
beginfig(0);
draw origin--(1cm,0) withcolor red;
draw btex g etex withcolor blue;
endfig;
beginfig(18);
numeric u;
u = 1cm;
draw (0,2u)--(0,0)--(4u,0);
pickup pencircle scaled 1pt;
draw (0,0){up}
for i=1 upto 8: ..(i/2,sqrt(i/2))*u endfor;
label.lrt(btex $\sqrt x$ etex, (3,sqrt 3)*u);
label.bot(btex $x$ etex, (2u,0));
label.lft(btex $y$ etex, (0,u));
endfig;
\end{mplibcode}%
B\par
A%
\begin{mplibcode}
beginfig(2);
numeric u; u=1cm;
z1=-z2=(-u,0);
for i = 1 upto 3:
draw z1..(0, i*u)..z2;
label.top(TEX("$e_{" & decimal(i) & "}$"), (0, i*u)) withcolor blue;
endfor;
endfig;
\end{mplibcode}%
B\par
\mplibsetformat{metafun}%
\begin{mplibcode}
verbatimtex \moveright 0.4\hsize etex
beginfig(0);
path p; p:= fullcircle scaled 2cm yshifted .5cm;
fill p withcolor transparent("normal", 0.5, red);
fill p rotated 120 withcolor transparent("normal", 0.5, green);
fill p rotated 240 withcolor transparent("normal", 0.5, blue);
endfig;
verbatimtex \leavevmode etex
picture p; p := btex MetaPost etex scaled 2;
beginfig(1);
linear_shade(bbox p,0,blue,.7white);
draw p withcolor white;
endfig;
verbatimtex \kern10pt etex
beginfig(2);
circular_shade(bbox p,0,blue,.7white);
draw p withcolor white;
endfig;
\end{mplibcode}%
\newbox\mympbox
\begin{mplibcode}
verbatimtex \global\setbox\mympbox etex
beginfig(0);
breadth=.667\mpdim\linewidth;
height=2pt;
x1=0; x2=x6=.333x4; x5=x3=.667x4;
x4=breadth;
y1=y4=height/2; y2=y3=height; y5=y6=0;
fill z1--z2--z3--z4--z5--z6--cycle;
endfig;
\end{mplibcode}%
\copy\mympbox
\copy\mympbox
\copy\mympbox
\copy\mympbox
\end{document}
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