Circle drawing using Polar based algorithm with C++

Sat Jul 21, 2012 2:14 pm

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); }