1 #include "mplot.h" box(double x0,double y0,double x1,double y1)2 void box(double x0, double y0, double x1, double y1){ 3 move(x0, y0); 4 vec(x0, y1); 5 vec(x1, y1); 6 vec(x1, y0); 7 vec(x0, y0); 8 } 9