scrolling spectrogram

**mcarter** · 25th November 2009, 15:16

I am new to the Qt community and found that the Qwt is a nice addition for data plotting. I was looking for some advice and thought I would post a message . . . sorry if this is the wrong place for this query.

I am currently working on a project to create a scrolling spectrogram and was wondering if anyone has done anything similar to help me get started.

Basically, I have a data source that is sending me data periodically and I want to "plot" the data in the current viewport. There are some additional requirements for panning and zooming (and maybe also for a good scrolling time axis), but for now I want to get the scrolling part working.

Any help would be greatly appreciated.

**Uwe** · 30th November 2009, 10:16

Check the spectrogram example. Its plot widget is initialized for zooming and panning.

Uwe

**mcarter** · 30th November 2009, 14:22

I have been looking over the spectrogram example. I like the concept of the panning and zooming. Do you know if there is a way to pan/zoom the data using the axes?

Do you know the best way to scroll the spectrogram with new data? I was thinking of a timer based on the time axis resolution and then shift the viewed data. It is just supplying a new set of data for the spectrogram with a replot?