Circle drawing using Bresenham

Sat Jul 21, 2012 2:12 pm

Circle drawing using Bresenham algorithm with C++ MFC.

Code:: void CircleBresenham(HDC hdc,int xc,int yc, int R,COLORREF color) { int x=0,y=R; int d=1-R; Draw8Points(hdc,xc,yc,x,y,color); while(x<y) { if(d<0) d+=2*x+2; else { d+=2*(x-y)+5; y--; } x++; Draw8Points(hdc,xc,yc,x,y,color); } }

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); }