Circle drawing using Polar based algorithm with C++

DrRakha

Circle drawing using Polar based algorithm with C++ MFC.

Code:

  void CirclePolar(HDC hdc,int xc,int yc, int R)
            {
            int x=R,y=0;
            double theta=0,dtheta=1.0/R;
            Draw8Points(hdc,xc,yc,x,y );
            while(x>y)
            {
            theta+=dtheta;
            x=round(R*cos(theta));
            y=round(R*sin(theta));
            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 drawing using Polar based algorithm with C++