QFrame error when subclassing QwtPlot

Hi,

I was making a simple subclass of QwtPlot but Iḿ ot able to compile it. Every time I try, I get this error:

Quote:

In file included from vectplot.h:2,
from principal.h:10,
from principal.cpp:1:
/usr/include/qt4/QtGui/qframe.h: In copy constructor ‘QwtPlot::QwtPlot(const QwtPlot&)’:
/usr/include/qt4/QtGui/qframe.h:140: error: ‘QFrame::QFrame(const QFrame&)’ is private
/usr/local/qwt-5.2.0/include/qwt_plot.h:73: error: within this context

Here's the code from my vectplot.h file:

Code:

#include <qwt_plot.h>
 
 
class Vectplot: public QwtPlot
{
    Q_OBJECT
 
public:
    Vectplot(QWidget *parent = NULL);
 
private:
    void alignScales();
    void getDataPlot();
    double equis[2000];
    double ye1[2000];
    double ye2[2000];
};

And here's the code from the vectplot.cpp file:

Code:

#include "vectplot.h"
#include <math.h>
#include <qpainter.h>
#include <qwt_plot_curve.h>
#include <qwt_symbol.h>
#include <qwt_scale_widget.h>
#include <stdlib.h>
 
 
Vectplot::Vectplot(QWidget *parent):
        QwtPlot(parent)
{
 
        // We don't need the cache here
        canvas()->setPaintAttribute(QwtPlotCanvas::PaintCached, false);
        canvas()->setPaintAttribute(QwtPlotCanvas::PaintPacked, false);
 
       QwtPlotCurve *curve1 = new QwtPlotCurve("Curve 1");
       QwtPlotCurve *curve2 = new QwtPlotCurve("Curve 2");
       curve1->attach(this);
       curve2->attach(this);
       getDataPlot();
 
       curve1->setData(equis, ye1, 2000);
       curve2->setData(equis,ye2, 2000);
       curve1->setPen(QPen(Qt::red, 2));
       curve2->setPen(QPen(Qt::blue,2));
       curve1->setStyle (QwtPlotCurve::Lines) ;
       curve2->setStyle(QwtPlotCurve::Dots);
 
      replot();
}
 
void Vectplot::alignScales()
{
 
    canvas()->setFrameStyle(QFrame::Box | QFrame::Plain );
    canvas()->setLineWidth(1);
 
    for ( int i = 0; i < QwtPlot::axisCnt; i++ )
    {
        QwtScaleWidget *scaleWidget = (QwtScaleWidget *)axisWidget(i);
        if ( scaleWidget )
            scaleWidget->setMargin(0);
 
        QwtScaleDraw *scaleDraw = (QwtScaleDraw *)axisScaleDraw(i);
        if ( scaleDraw )
            scaleDraw->enableComponent(QwtAbstractScaleDraw::Backbone, false);
    }
}
 
void Vectplot::getDataPlot()
{
    for (int i = 0; i < 2000; i++)
    {
                    ye1[i] = i / sqrt(i) ;
                    equis[i] = i ;
                    ye2[i] = sin(i);
    }
}

I'm sure the error is something stupid, but haven't been able to find it. If someone could, please, check this and tell me what's going on, I'd appreciate it :).

Thanks in advance,

Claudia