On Mar 6, 2017, at 6:50 PM, Axel Kowald <[log in to unmask]> wrote:

> Btw., how do you manage to cull the data without distorting the shape of the diagram ?
> Do you still keep all data points and then only display a subset, or do you really delete data ?

We're really deleting data.  

There are different culling strategies, and you can implement your own.  But the strategy we're using is in  Let the maximum size be N.  Then:

1. Let the chart grow to N in size.
2. Until the chart is N/2+1 in size, repeat:
	2A. Remove the point whose left and right neighbors are closest to one another.  Break ties by choosing the earlier point.  Never remove the first and last points in the series.