ref: 3c3ba05ce6286c2a4bf691a7853412bf7e9647db dir: /sys/src/cmd/plot/libplot/box.c/
#include "mplot.h" void box(double x0, double y0, double x1, double y1){ move(x0, y0); vec(x0, y1); vec(x1, y1); vec(x1, y0); vec(x0, y0); }