setviewport

/*
Write a program in C for setviewport
*/

#include<graphics.h>
#include<conio.h>

main()
{
int gd = DETECT, gm, midx, midy;

initgraph(&gd, &gm, "C:\\TC\\BGI");

midx = getmaxx()/2;
 
midy = getmaxy()/2;

setviewport(midx - 50, midy - 50, midx + 50, midy + 50, 1);
 
circle(50, 50, 55);

getch();
 
closegraph();
 
return 0;
}