ref: 3f5a4e9f7e3c0d1e7c43d2974049e2eb7bc7b5a0 dir: /sys/src/cmd/plot/libplot/line.c/
#include "mplot.h" void plotline(double x0, double y0, double x1, double y1){ move(x0, y0); vec(x1, y1); }