https://issues.apache.org/ooo/show_bug.cgi?id=122822

--- Comment #22 from [email protected] ---
Regarding 2: I disagree - in x-y plots the min and max values are not special
and therefore not of any interest if one is not plotting the whole data-set
(except maybe for calculating the automatic y-scale which probably should be
the same for the full and reduced-data-set) 

see attachment "origin-plot-large-data.png" how (this old version) handels
large datasets...


(In reply to [email protected] from comment #19)
> With the spreadsheet component having been extended to handle more than a
> million rows the idea of issue 121058 to reduce the number of displayed
> items has its merits. Your random cloud example shows that the current
> behavior has some serious problems though:
> 1. the current reduction is by a constant factor of 50 when 10000 entries
> are involved
> 2. only the minimum and maximum values are considered interesting, other
> values are completely ignored
> 3. the point information displayed in the tooltip does no longer match
> 
> Regarding 1. it should be reduced gracefully by limiting the number of
> displayed item to e.g. 2500 and calculating the reduction factor from there.
> Maybe the that reduction target number needs to be adjustable per chart.
> 
> Regarding 2. the minimum and maximum numbers are most interesting but other
> values must not be ignored. Choosing a random item other than the min or max
> items is a good idea.
> 
> Regarding 3. when reduction is active the tooltip annotation needs to
> disabled

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