Hi,

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

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:

Qt Code: 
  1. #include <qwt_plot.h>
  2.  
  3.  
  4. class Vectplot: public QwtPlot
  5. {
  6.     Q_OBJECT
  7.  
  8. public:
  9.     Vectplot(QWidget *parent = NULL);
  10.  
  11. private:
  12.     void alignScales();
  13.     void getDataPlot();
  14.     double equis[2000];
  15.     double ye1[2000];
  16.     double ye2[2000];
  17. };
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And here's the code from the vectplot.cpp file:

Qt Code: 
  1. #include "vectplot.h"
  2. #include <math.h>
  3. #include <qpainter.h>
  4. #include <qwt_plot_curve.h>
  5. #include <qwt_symbol.h>
  6. #include <qwt_scale_widget.h>
  7. #include <stdlib.h>
  8.  
  9.  
  10. Vectplot::Vectplot(QWidget *parent):
  11.         QwtPlot(parent)
  12. {
  13.  
  14.         // We don't need the cache here
  15.         canvas()->setPaintAttribute(QwtPlotCanvas::PaintCached, false);
  16.         canvas()->setPaintAttribute(QwtPlotCanvas::PaintPacked, false);
  17.  
  18.        QwtPlotCurve *curve1 = new QwtPlotCurve("Curve 1");
  19.        QwtPlotCurve *curve2 = new QwtPlotCurve("Curve 2");
  20.        curve1->attach(this);
  21.        curve2->attach(this);
  22.        getDataPlot();
  23.  
  24.        curve1->setData(equis, ye1, 2000);
  25.        curve2->setData(equis,ye2, 2000);
  26.        curve1->setPen(QPen(Qt::red, 2));
  27.        curve2->setPen(QPen(Qt::blue,2));
  28.        curve1->setStyle (QwtPlotCurve::Lines) ;
  29.        curve2->setStyle(QwtPlotCurve::Dots);
  30.  
  31.       replot();
  32. }
  33.  
  34. void Vectplot::alignScales()
  35. {
  36.  
  37.     canvas()->setFrameStyle(QFrame::Box | QFrame::Plain );
  38.     canvas()->setLineWidth(1);
  39.  
  40.     for ( int i = 0; i < QwtPlot::axisCnt; i++ )
  41.     {
  42.         QwtScaleWidget *scaleWidget = (QwtScaleWidget *)axisWidget(i);
  43.         if ( scaleWidget )
  44.             scaleWidget->setMargin(0);
  45.  
  46.         QwtScaleDraw *scaleDraw = (QwtScaleDraw *)axisScaleDraw(i);
  47.         if ( scaleDraw )
  48.             scaleDraw->enableComponent(QwtAbstractScaleDraw::Backbone, false);
  49.     }
  50. }
  51.  
  52. void Vectplot::getDataPlot()
  53. {
  54.     for (int i = 0; i < 2000; i++)
  55.     {
  56.                     ye1[i] = i / sqrt(i) ;
  57.                     equis[i] = i ;
  58.                     ye2[i] = sin(i);
  59.     }
  60. }
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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