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\documentclass[border=5mm]{standalone}
\usepackage{luamplib}
\usepackage{fontspec}
\setmainfont{TeX Gyre Pagella}
\begin{document}
\mplibtextextlabel{enable}
\begin{mplibcode}
beginfig(1);
picture p, q;
p = thelabel.rt("\fontsize{48}{48}\selectfont plain", origin);
q = thelabel.rt("\fontsize{48}{48}\selectfont rotated", origin) rotated 30;
picture P[];
numeric i; i = 0;
forsuffixes @=p,q:
P[incr i] = image(
fill bbox @ withcolor 15/16[red, white];
draw llcorner @ -- lrcorner @ -- urcorner @ -- ulcorner @ -- cycle
withcolor 7/8[red, white];
draw llcorner @ -- urcorner @ withcolor 7/8[red, white];
draw ulcorner @ -- lrcorner @ withcolor 7/8[red, white];
draw @ withcolor 3/4;
dotlabel.lft("\texttt{llcorner}", llcorner @);
dotlabel.rt ("\texttt{lrcorner}", lrcorner @);
dotlabel.rt ("\texttt{urcorner}", urcorner @);
dotlabel.lft("\texttt{ulcorner}", ulcorner @);
draw fullcircle scaled 3 shifted center @;
);
endfor
labeloffset := 20;
label.top(P1, origin);
label.bot(P2, origin);
endfig;
\end{mplibcode}
\end{document}
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