Plan 9 from Bell Labs’s /usr/web/sources/contrib/steve/root/sys/src/cmd/tex/tpic/libtex/circle.c
#include "tex.h" circle(xc, yc, r) double xc, yc, r; { int rad = SCX(r); fprintf(TEXFILE, " \\special{ar %d %d %d %d 0.0 6.2832}%%\n", TRX(xc), TRY(yc), rad, rad); }