Panning with Qwt

[Momergil]

Hello!

I would like to use panning function in my software that uses Qwt, and considering what I did till now, everything works fine:

pannerTend = new QwtPlotPanner(plotTend->canvas());
pannerTend->setMouseButton(Qt::MiddleButton);
pannerTend->setCursor(QCursor(Qt::ClosedHandCursor));

pannerTend = new QwtPlotPanner(plotTend->canvas());
pannerTend->setMouseButton(Qt::MiddleButton);
pannerTend->setCursor(QCursor(Qt::ClosedHandCursor));

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The problem is that when I grab the canvas with the mouse and perform the panning, it is not done automatically, i.e. the new part of the canvas is always clean and the axis don't move. Only when I release the mouse the canvas is reploted and the panning appears:

panning.jpg

Is there a way to change that, even if I have to change the .cpp/.h of Qwt, so always when the mouse moves the canvas is reploted with the panning changes (exactly as how is done in Google Maps or in Qt Example Light Maps)?

Thanks!


Momergil

[Momergil]

Could somebody help? :x

[Spitfire]

I don't think what you want can be easily (if at all) done with panner, as it takes a copy of the plot and that's what it moves around.
Even if you update the plot the pixmap held by panner will not change.

I guess it would be easier done using zoomer.
you could call QwtPlotZoomer::moveBy(double x, double y) on every mouse move which should do what you want.

I've never done anything like that so I may be wrong here but I think it's worth a try.