Is FilterPointsAggressive property using max-min decimation algorithm?

[Uwe]

Am I understanding correctly, that you are saying that I can plot just dots, not lines? I.e. a dot plot, instead of the line plot?

Of course you can print dots as well - this is what QwtPlotCurve::Dots style does ( a scatter plot ). If you want to go this way have a look at the scatterplot example. It does a completely different type of optimization, one that works for unordered points, is independent of hardware acceleration ( no OpenGL required ) and can be processed multithreaded.

But this is totally unrelated to my previous answers.

Uwe