Using QwtLegend to change curve attributes

Hi all,

I've followed the example that shows how to switch on/off plots, by using the LegendItems and making the Items checkable.

I was wondering if you could set the same LegendItems to clickable and then change the curve attributes (i.e. width, color, style, etc)

At the moment I can select the appropriate Item, but don't know how to translate this grabbing the correct QwtPlotCurve pointer, as I have more than one QwtPlotCurve pointers allocated.

Any help would be appreciated.

Robbie

Everything you asked can be found by taking a look in the docs. Anyway, here you are:

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I was wondering if you could set the same LegendItems to clickable

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Have a look at QwtLegend::setItemMode()

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At the moment I can select the appropriate Item, but don't know how to translate this grabbing the correct QwtPlotCurve pointer

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Use the Signal QwtPlot::legendClicked(QwtPlotItem *plotItem) and connect it to any custom slot. Then you can do anything you want with the pointer you get.

Regards,
Weilor