qwtlegend

Hi,

i use a QwtPlot with a QwtPlotShapeItem...

Code:

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QPainterPath path;
path.addRect(....);
 
plotShapeItem.setRenderHint(QwtPlotItem::RenderAntialiased, true);
plotShapeItem.setShape(path);
plotShapeItem.setItemAttibute(QwtPlotItem::Legend, true);
plotShapeItem.setLegendMode(QwtPlotShapeItem::LegendShape);
plotShapeItem.setLegendIconSize(QSize(20, 20));
plotShapeItem.setTitle(QString("Winter"));
plotShapeItem.attach(&plot);

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how can i make the legend for plotShapeItem enabled? I dont know how to config the QwtLegend in this case... See here:
Attachment 11306

I would need the QwtLegendLabel and call setchecked(true)...ideas?

Thanks,
S

Have a look at the itemeditor example.

Uwe

i cannot find the relevant part....which file and line do you mean?

i only found this part, which looks similar what i do: https://github.com/sikoragmbh/qwt/bl....cpp#L92:#L107
i dont see QwtLegendLabel calling setchecked in this code...ideas?

sorry for the confusion....
i have upated the image... as you see Winter is not enabled in the legend, but the QwtPlotShapeItem is visible (as expected)
i want to enable the QwtLegendLabel for Winter ... therefore i need to get the QwtLegendLabel and call setchecked(true)... ideas?

Attachment 11308

any idea Uwe?

tvplot and cpuplot examples show how to get access the legend label for an item.

When you are wondering, why there is no more obvious getter ( like in earlier Qwt versions ) have a look at the stockchart example, where the legend is replaced by a tree view. It is like with QAbstractItemModel - this mysterious API is the price 99.9% of the applications have to pay to make 0.1% of the use cases possible.

Uwe

ah thaks...i fixed it, i didnt see that itemList takes different parameters: http://qwt.sourceforge.net/class_qwt...f2f2f2af871bf3

Code:

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QwtPlotItemList items = itemList( QwtPlotItem::Rtti_PlotShape );
    for ( int i = 0; i < items.size(); i++ )
    {
        QwtLegendItem *legendItem = qobject_cast<QwtLegendItem *>( legend->find( items[i] ) );
        if ( legendItem ) {
            legendItem->setChecked( true );
        }
 
        items[i]->setVisible( true );
    }

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