Very very long Plot

[BobTheProg]

This is a newbie question. I'm looking for guidance on how best to plot a long chart.

I have to plot a very long chart - potentially several million points. Also, the user can zoom in so the virtual chart can be 100 million pixels long.

The data is accessed via a QAbstractTableModel.

Is this a suitable task for the Qwt widgets?

Thanks
Bob

[Uwe]

The number of points have an impact on the painting performance. After writing a QwtData object, that forwards the points from your model, you will see if it is fast for your needs. If not:

a) Don't use a model. Passing trillions of points through this fat API hurts.
b) Implement different level of details depending on the zoom level to reduce the number of points.

Uwe

[BobTheProg]

Thanks, Uwe. I'll rework the strategy to bypass the model stuff.

Bob