On 31.07.2013 13:25, Regina Henschel wrote:
Hi all,
an Excel chart with lot of points hanged on opening [1] and that was
fixed with r1388440.
But it was done in a way, that it has undesirable effects. Now charts
which much data points, that show well in AOO3.4.1, are broken. [3][4]
There exists already a data point reduction to eliminate "identical"
points for rendering, see class PlottingPositionHelper and its use.
There the time consuming rendering is reduced, but the data series
itself are not changed.
I think, that the way as it is done in [2], reducing the points in the
data series itself in general, is not the best approach,
Agreed, the data series itself should not be tampered with.
Reducing the details only for visualization (i.e. in the chart module)
is a much better approach. If reducing is desirable that is; but with
Calc handling a million rows since OOo 3.3 its now too easy to make
AOO's chart hang.
Even millions of display items shouldn't be a problem on todays
hardware. AFAIK the scalability problem comes notifications triggering
other notification resulting in avalanche of them. Solving that would be
best.
and it should be reverted to solve the regression introduced by it.
It is a bad regression indeed. The change that introduced it had bad
problems because it only handled integers, some indices were not
properly initialized and values other than minimum and maximum were
ignored. We have solutions for the first two problems and another fix
introducing some additional random sampling is easy.
Until the chart-reduction or even better the notification-avalanche
problems are solved maybe we should go with these suggested fixes as an
intermediate step.
Herbert
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