Re: Performance - large data sets

[Uwe R. <Uwe...@ti...>]

> I need to plot a fairly large data set (~100'000)
> data points, each point with a different color.

In Qwt 6.x ( SVN trunk ) you find QwtPlotSpectroCurve, that maps z values into 
colors.

> Currently, I am using a loop and defining a new
> QwtPlotMarker and setting the pen inside this
> loop. The performance is not optimal, however.

Using markers for displaying large data sets is no acceptable solution. Better 
derive from QwtPlotCurve and overload drawSymbols().

Uwe