Histogram

[giusepped]

Hi.
I tried to put a legend in Hisotrgr. Although the legend is displayed, there are no symbols attached to the text in the legend.
Why?

legend = new QwtLegend;
 
 
 
        rataPlot = new HistogramItem(tr("Rata"));
	rataPlot->attach(qwtPlot);
        rataPlot->setColor(Qt::red);
 
        rawPlot = new HistogramItem(tr("MOL - Dati grezzi"));
	rawPlot->attach(qwtPlot);
	rawPlot->setColor(Qt::darkGray);
 
 	qwtPlot->setCanvasBackground(QColor(Qt::white));
 
        qwtPlot->insertLegend(legend,QwtPlot::BottomLegend);

legend = new QwtLegend;



        rataPlot = new HistogramItem(tr("Rata"));
	rataPlot->attach(qwtPlot);
        rataPlot->setColor(Qt::red);
       
        rawPlot = new HistogramItem(tr("MOL - Dati grezzi"));
	rawPlot->attach(qwtPlot);
	rawPlot->setColor(Qt::darkGray);

 	qwtPlot->setCanvasBackground(QColor(Qt::white));
   
        qwtPlot->insertLegend(legend,QwtPlot::BottomLegend);

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