drawing in an nscell subclass

[Rob Burns]

I have the following bit of code in an subclass of NSCell, which draws 
a circle (or oval) in the middle of the cell. It works. the circle 
appears to be centered within the cell. But, I would expect the x and 
y origin offsets to be the same to get that behaviour. If I modify x 
and y offsets to be the same (3), and increase the height and width 
modifications to 6, like I would expect to have to do, the circle 
isn't centered. Is that the correct behavior?

Rob

- (void) drawInteriorWithFrame: (NSRect)cellFrame inView: (NSView 
*)controlView;
{
  NSBezierPath *circle;

  [_color set];
  circle = [NSBezierPath bezierPathWithOvalInRect: NSMakeRect(
    cellFrame.origin.x,
    cellFrame.origin.y +3,
    cellFrame.size.height-3,
    cellFrame.size.width-3)];
  [circle fill];
}


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