#include "pssub.h"

void main()
{    
     int i,j,n=10;double x,y;double x1[100],y1[100];
     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();
     for(i=0;i<=n;i++) { 
      for(j=0;j<=n;j++) {
		x=(double)i/(double)n; y=(double)j/(double)n;
		circ(x,y, 0.002);fill();
	  }
	 }
     linety(1); linewidth(2.0); 
     x1[0]=0.50; y1[0]=0.00; x1[1]=0.00; y1[1]=0.50; x1[2]=0.00; y1[2]=1.00; 
     x1[3]=0.50; y1[3]=0.70; 
     newpath(); plot(x1[0], y1[0], 3); 
     curvtona(x1,y1,0.7,4); 
     stroke();
     for(i=0;i<=3;i++) { 
		x1[i]=1.0-x1[i]; 
	 }
     newpath(); plot(x1[0], y1[0], 3); 
     curvtona(x1,y1,0.6,4); 
     stroke();
     for(i=0;i<=3;i++) { 
       circ(x1[i],y1[i], 0.006);fill();
       circ((1.0-x1[i]),y1[i],0.006);fill();
	 }
     stroke();
     fin(); 
}