YChange          1472 core/gui_draw.c     int XChange, YChange;
YChange          1481 core/gui_draw.c     YChange = XRadius*XRadius;
YChange          1501 core/gui_draw.c         EllipseError += YChange;
YChange          1502 core/gui_draw.c         YChange += TwoASquare;
YChange          1514 core/gui_draw.c     YChange = XRadius*XRadius*(1-2*YRadius);
YChange          1542 core/gui_draw.c         if ((2*EllipseError + YChange) > 0 )
YChange          1546 core/gui_draw.c             EllipseError += YChange;
YChange          1547 core/gui_draw.c             YChange += TwoASquare;