| Date: May 14, 2005
Time: 7:44:13 PM
This class incapsulates text metrics specific for the text layout or
for the separate text segment. Text segment is a text run with the constant direction
and attributes like font, decorations, etc. BasicMetrics is also used to store
calculated text metrics like advance, ascent or descent. this class is very similar to
LineMetrics, but provides some additional info, constructors and is more transparent.
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