Crash on deleting ChartDataItem (x=NaN)
lazarus / 55-TAChart

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wp · 2011-11-06 14:47

When attempting to delete a ChartDataItem from a TListChartSource
containing a NaN results in a crash in TListChartSource.Delete.

See the attached project to verify the bug. The chart source of the
line series is constructed to have a NaN for the x value of data item
#0. Clicking on the "Delete Point #0" tries do delete this point from
the series. This causes a crash because TListChartSource.Delete
compares the Extent with NaN.

[Edit] There are also NaN related issues in
TListChartSourceStrings.Get (not demonstrated in the attached
project).

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Ask · 2011-11-06 19:40

I am travelling now, so I will not be able to fix this until the next
week.
The fix for this particular issue is simple, but the general tendency
somewhat worries me --
too many IsNan checks might hurt performance... or maybe this effect
will be insignificant
and is nothing to worry about.