[QWT] Edit legend icons size

Creatorczyk

Hi,

I would like to change size of icon in my QwtLegend. So I wrote something like this:

QwtPlotCurve* curve = new QwtPlotCurve();

...

curve->attach(this);

QwtPlotLegendItem *lgdItem =  dynamic_cast<QwtPlotLegendItem*>(legend->find(curve));
lgdItem->setLegendIconSize(QSize(15,15));

But I got error:

error: cannot initialize a parameter of type 'WId' (aka 'unsigned int') with an lvalue of type 'QwtPlotCurve *'

I saw in others examples this solution. I use this version of qwt: https://sourceforge.net/p/qwt/code/HEAD/tree/branches/qwt-6.1-multiaxes/

How could I change icons size?

SGaist

Hi,

Which line of your code triggers this ?
Can you show the full code where it happens ?

Creatorczyk

@SGaist unfortunately I can't show all the code. The problem is in function:

legend->find(curve)

SGaist

@Creatorczyk said in [QWT] Edit legend icons size:

legend

What is it ?
Where do you create it ?

Creatorczyk

@SGaist It's object of QwtLegend, defined in constructor of my own Plot

Chart::Chart(QWidget* parent) :
  QwtPlot(parent)
{
    QwtLegend *legend = new QwtLegend(this);
    legend->setFont(QFont("Helvetica", 12));
    insertLegend(legend, QwtPlot::BottomLegend);
}