Q:
When do I need to call CGContextClosePath?
A:
Unlike ClosePicture and CloseRgn, CGContextClosePath doesn't
stop the definition of a path, it adds a line from the current
point back to the starting point in order to mathematically
close the current subpath.
You can visually but not mathematically close the path yourself
by drawing a final
line back to the starting point. The difference between a path that
is closed manually without calling CGContextClosePath and
one that is closed using CGContextClosePath is that the
former will have line ends applied at the start and end points while the
latter will have line joins applied.
So, call CGContextClosePath when you want the current line join applied
to the ends of your path and don't call it when you want the current line
end caps applied.
[Oct 02 2001]
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