Waterfall plot without interpolation

Hi,

I have been trying to avoid crying for help since I thought I was going to be able to implement my waterfall like plot using QwtPlotSpectrogram but things are not going as planned!

I need to plot horizontal bars in which each bar is divided into squares according to the number of variables that I receive externally. What I need is that each square will have a precise color according to a colour map and not according to some kind of interpolation between the points!

So far I have tried using QwtSpectrogram with no luck and (as suggested in another thread) QwtPlotSpectroCurve with a bit more success but while the y-dimension of my squares are ok (I am using a big PendWidth) I can't manage to change the 'dimension' of the x coordinate for each square.

Thanks in advance.

How are the geometries of the bar and of the squares inside the bar related to the x,y axes ?

Uwe

Hi, thanks for replying and sorry for replying so late!

I am trying to get an horizontal bars that spans the x axis. The y-axis should be the time.
I've used a Qvector of QwtPoint3D where in each point x is between 0 and the number of variables I have in the data, y is time and, z is the data.

Guess using QwtPlotSpectrogram with QwtPlotMatrixData should be an easy way to implement this. See the rasterview example.

Uwe

Ok. Will try it.
Thanks for the help, I'll post again if I get stuck!

Cheers,