Is it possible to get a legend ID using QwtLegend?

[Spitfire]

Hey,

The legend item list is sorted, but the key is not the text but the pointer to the widget:

"Curve 5" QwtLegendItem(0x931ead0) 
"Curve 0" QwtLegendItem(0x931eb48) 
"Curve 4" QwtLegendItem(0x931ebe8) 
"Curve 1" QwtLegendItem(0x931ec10) 
"Curve 6" QwtLegendItem(0x931ecb0) 
"Curve 3" QwtLegendItem(0x931ef08) 
"Curve 2" QwtLegendItem(0x933ad50) 
"Curve 7" QwtLegendItem(0x933ae90) 
"Curve 8" QwtLegendItem(0x933af30) 
"Curve 9" QwtLegendItem(0x933afd0)

"Curve 5" QwtLegendItem(0x931ead0) 
"Curve 0" QwtLegendItem(0x931eb48) 
"Curve 4" QwtLegendItem(0x931ebe8) 
"Curve 1" QwtLegendItem(0x931ec10) 
"Curve 6" QwtLegendItem(0x931ecb0) 
"Curve 3" QwtLegendItem(0x931ef08) 
"Curve 2" QwtLegendItem(0x933ad50) 
"Curve 7" QwtLegendItem(0x933ae90) 
"Curve 8" QwtLegendItem(0x933af30) 
"Curve 9" QwtLegendItem(0x933afd0)

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So answer to question 2 is: list doesn't change the order, it's just ordered by something else that you'd expect.

I don't know where you got the 'ser_no', but I couldn't find it anywhere in qwt 6.0.1 source I have.

To answer your original question:
Create additional map of your curves in format: QMap< QwtPlotItem*, int >, where pointer is your curve, and int is its ID (may be index in other list you have or anything else that you find useful);
this way in your setConfig() you can get ID of each curve from the pointer you're getting there.

Now I have a question:
Why do you need it for?
There may be something wrong with your thinking here.

[cesroc]

Hello,

I found a way to get the ser_no.

((QwtLegendItem*)legendList[i])->identifier().serialNumber();

((QwtLegendItem*)legendList[i])->identifier().serialNumber();

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It's working know, I have the ID I need and I can find which legend even if they have the same name.

Thanks for your help.
Bye

[electro300]

I'm sorry to reopen this topic.

I have the same problem but QwtLegendItem doesn't exist now with Qwt 6.1.2! Now we only have QwtPlotLegendItem.

This line is not possible :

((QwtLegendItem*)legendList[i])->identifier().serialNumber();

((QwtLegendItem*)legendList[i])->identifier().serialNumber();

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I just can do this but it's not ok :

QwtPlotItem *plotItem = plot_spectre->infoToItem( itemInfo );  
    nom_courbe = plotItem->title().text();

QwtPlotItem *plotItem = plot_spectre->infoToItem( itemInfo );  
    nom_courbe = plotItem->title().text();

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What can i do?

Maybe put the legend with QwtPlotLegendItem but i don't arrive to put on right the legend as :

insertLegend(legend, QwtPlot::RightLegend);

insertLegend(legend, QwtPlot::RightLegend);

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The legend is inside the plot.