Circle direct drawing algorithm

DrRakha

Circle direct drawing algorithm using C++ MFC

Code:

  void CircleDirect(HDC hdc,int xc,int yc, int R)
           {
             int x=0,y=R;
             int R2=R*R;
             Draw8Points(hdc,xc,yc,x,y);
                  while(x<y)
                   {
                 x++;
                     y=round(sqrt((double)(R2-x*x)));
                   Draw8Points(hdc,xc,yc,x,y);
                  }
           }
 

Code:

   void Draw8Points(HDC hdc,int xc,int yc, int a, int b)
            {
                    SetPixel(hdc, xc+a, yc+b, NULL);
                    SetPixel(hdc, xc-a, yc+b, NULL);
                    SetPixel(hdc, xc-a, yc-b, NULL);
                    SetPixel(hdc, xc+a, yc-b, NULL);
                    SetPixel(hdc, xc+b, yc+a, NULL);
                    SetPixel(hdc, xc-b, yc+a, NULL);
                    SetPixel(hdc, xc-b, yc-a, NULL);
                    SetPixel(hdc, xc+b, yc-a, NULL);
          }
          
 

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Circle direct drawing algorithm

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