Tuesday, November 29, 2011

Midpoint Circle Algorithm Using C Programming



#include
#include
#include

void main()
{
 int gd=DETECT,gm;
 int x,y,r;
 void Drawcircle(int,int,int);
 printf("Enter the Mid points and Radious:");
 scanf("%d%d%d",&x,&y,&r);
 initgraph(&gd,&gm,"");
 Drawcircle(x,y,r);
 getch();
 closegraph();
}

void Drawcircle(int x1,int y1,int r)
{
 int x=0,y=r,p=1-r;
 void cliplot(int,int,int,int);
 cliplot(x1,y1,x,y);
 while(x
 {
 x++;
 if(p<0)
  p+=2*x+1;
  else
  {
   y--;
   p+=2*(x-y)+1;
  }
  cliplot(x1,y1,x,y);
 }
}


void cliplot(int xctr,int yctr,int x,int y)
{
 putpixel(xctr +x,yctr +y,1);
 putpixel(xctr -x,yctr +y,1);
 putpixel(xctr +x,yctr -y,1);
 putpixel(xctr -x,yctr -y,1);
 putpixel(xctr +y,yctr +x,1);
 putpixel(xctr -y,yctr +x,1);
 putpixel(xctr +y,yctr -x,1);
 putpixel(xctr -y,yctr -x,1);
 getch();
}

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