Aligning ticks to data in a Spectrogram using QwtMatrixRasterData

[SpiceWeasel]

You need to have the ticks at 0.5, 1.5 ... to have them centered.

If you don't need zooming it can be done by creating an QwtScaleDiv manually - otherwise you need to set the parameters for the scale engine properly. Then you can change the labels representing the values to 1, 2 .. by overloading QwtScaleDraw::label().

Uwe

I do need zooming... which I am working on right now. I am not familiar with QwtScaleEngine and QwtScaleDraw -- going to have to do some experimenting. Thanks Uwe.