This patch adds a new constructor to XYItemEntity which
takes an XYToolTipGenerator and XYURLGenerator as
arguments. When tooltips and URLs are not explicitly
set, they are generated (and the result kept) when
queried if the generator is non-null. All renderers
that use XYItemEntities have been modified to use the
Pre-generating all tooltips becomes a serious
performance hit when you start plotting 10000 data
items in a Swing GUI; this patch solves that.
This patch is based on the latest tree from CVS at time
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