ref: 4f17bd2cd1caf37eb2a8609d7882600fa1cafb3e 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); }