Hi Uwe,Xilcoy,
I managed to get just a solid horizontal bar displayed on the spectrogram and have control over where it is drawn in the vertical direction (for step 1), but I still don't think I understand how the raster/ spectrogram plot works, and the way I'm drawing the bar is extremely slow....it takes in the order of 23 seconds to draw a screen with only one bar drawn (no animation even attempted yet).
I am not doing anything with the copy method...should I be? Right now it is left as it was in the example I started with and just returns a pointer to the Spectrogram data object. I'm setting the bounding rect in the QwtRasterData method. To draw the horizontal line I have just been working with how the points are written to the value method. Admittedly this spectrogram plotting has me confused....Uwe, have you ever considered writing a tutorial book on Qwt? I'd buy it.
tim
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