Write a program to demonstrate draw ellipse using midpoint algorithm.

``` #include #include #include #include #include void ellipsemidpoint(int xcenter, int ycenter, int rx, int ry); void plotpoint(int x,int xcenter, int ycenter,int y); int maxx, maxy,xcenter,ycenter,rx,ry; int main(void) { int gdriver=DETECT, gmode, errorcode; initgraph(&gdriver, &gmode, "c:\\tc\\bgi"); maxx = getmaxx(); maxy = getmaxy(); xcenter= 250; ycenter= 250; rx= 50; ry= 50; ellipsemidpoint(xcenter,ycenter,rx,ry); getch(); closegraph(); return(0); } void ellipsemidpoint( int xcenter, int ycenter,int rx, int ry) { int p,px,py,x,y,ry2,rx2,tworx2,twory2; ry2= ry * ry; rx2= rx * rx; twory2= 2 * ry2; tworx2= 2 * rx2; x= 0; y= ry; plotpoint(x, xcenter, ycenter, y); p= abs(ry2 - ry2 * ry + ( 0.25 * rx2)); px= 0; py= tworx2 * y; while(px<py) { x= x+1; px= px + twory2; if(p>=0) { y= y-1; py= py - tworx2; } if(p<0) { p= p + ry2 + px; } else { p= p + ry2 + px; } plotpoint( x, xcenter, ycenter, y); } p= abs(ry2 * (x + 6.5) * (x + 6.5) + rx2 * (y - 1) * (y - 1) - rx2 * ry2); while (y>0) { y= y-1; py= py - tworx2; if(p<0) { x= x +1; px= px + twory2; } if(p>0) { p= p + rx2 - py; } else { p= p + rx2 -py +px; plotpoint(x, xcenter, ycenter, y); } } } void plotpoint(int x,int xcenter, int ycenter,int y) { putpixel (xcenter + x, ycenter + y, 2); putpixel (xcenter - x, ycenter + y, 2); putpixel (xcenter + x, ycenter - y, 2); putpixel (xcenter - x, ycenter - y, 2); } ``` </div>