C Program to Implement Midpoint Circle Drawing Algorithm

Midpoint circle drawing algorithm is another basic algorithms in computer graphics. Midpoint circle drawing algorithm is used to draw circles with minimal calculations. Here is a simple c program that implements Midpoint circle drawing algorithm.

#include<stdio.h>
#include<graphics.h>

void midp(int r, int xc,int yc)
{
int x,y;
float d;
d=1.25-r;
x=0;
y=r;
do
{
if(d<0)
 {
 x=x+1;
 d=d+2*x+1;
 }
else
 {
 x=x+1;
 y=y-1;
 d=d+2*x-2*y+10;
 }
putpixel(xc+x,yc+y,5);
putpixel(xc-y,yc-x,5);
putpixel(xc+y,yc-x,5);
putpixel(xc-y,yc+x,5);
putpixel(xc+y,yc+x,5);
putpixel(xc-x,yc-y,5);
putpixel(xc+x,yc-y,5);
putpixel(xc-x,yc+y,5);
}while(x<y);
}

int main()
{
int gd=DETECT,gm;
int xc,yc,r;
printf("Enter center and radius");
scanf("%d%d%d",&xc,&yc,&r);
initgraph(&gd,&gm,"..\\BGI\\");
midp(r,xc,yc);
delay(1500);
getch();
closegraph();
return 0;
}