#include "pssub.h"

void main()
{    
     int n=4;
     double x[4],y[4];
     x[0]=0.1;y[0]=0.1;x[1]=0.4;y[1]=0.1;x[2]=0.8;y[2]=0.4;x[3]=0.5;y[3]=0.6; 
     init();
     viewport(0.2,0.2,0.8,0.8); xyworld(0.0,0.0,1.0,1.0);
     linety(2); rect(0.0, 0.0, 1.0, 1.0);stroke();
     linety(1); linewidth(3.0); 
     setlinejoin(0); brokenlines(x,y,n); 
     text(0.06,0.02,"(0.1,0.1)");  text(0.36,0.02,"(0.4,0.1)"); 
     text(0.82,0.32,"(0.8,0.4)");  text(0.46,0.65,"(0.5,0.6)"); 
     stroke();
     fin(); 
}