Bresenham Circle VS others

[C.Ret]

Hi,

Nice implementation indeed, you now have an efficient way of filling your circles without lost of detail or no fill gaps !

Code:

EXPORT FCIRCLE_P(XC,YC,R,Col)
BEGIN
  LOCAL D:=3-2*R,  X:=0,    Y:=R;
  RECT_P(#0);
  WHILE Y>=X DO
     IF D>0   THEN   Y:=Y-1; D:=D+4*(X-Y)+10   ELSE   D:=D+4* X   + 6   END;
     LINE_P(XC+X,YC+Y,XC+X,YC-Y,Col);   LINE_P(XC-X,YC+Y,XC-X,YC-Y,Col);
     LINE_P(XC+Y,YC+X,XC+Y,YC-X,Col);   LINE_P(XC-Y,YC+X,XC-Y,YC-X,Col);
     X:=X+1    END;
  FREEZE
END;

But, you may have explained a bit more the trick you are using with the indicator variable D. Are the definition correct for any value of radius R or is there any hidden beast in the eke ?

It also a bit of a shame, you don't have post this related subject in your previous thread, since it is closely related, this will have help readers and subscribers to easier follow your progress.