Qwt plot inside QDialog inside QWidget?

[pauledd]

Hi

I do my first steps with qwt and I already stumbled upon a simple task.
I have a MainWindow (QWidget) that contains a QPushButton which will
open a PlotWindow (QDialog) that SHALL be filled by a Qwt Plot.
I used a QDialog because I want the PlotWindow close if I close the MainWindow.
The Qwt plot shall use all the space available in the PlotWindow

// mainwindow.h

#include <QWidget>
#include <QPushButton>
#include "plotwindow.h"
class MainWindow : public QWidget
{
    Q_OBJECT
public:
    explicit MainWindow(QWidget *parent=nullptr);
private:
    QPushButton *pushbutton;
    PlotWindow *plotWindow;
private slots:
    void showPlotWindow();
};

// mainwindow.cpp

#include "mainwindow.h"
MainWindow::MainWindow(QWidget *parent)
    :QWidget(parent)
{
    pushbutton = new QPushButton("PLOT",this);
    plotWindow = new PlotWindow(this);
    connect(pushbutton,&QPushButton::clicked,this,&MainWindow::showPlotWindow);
}

void MainWindow::showPlotWindow()
{
    plotWindow->show();
}

// plotwindow.h

#include <QDialog>
#include <qwt/qwt_plot.h>


class PlotWindow : public QDialog
{
    Q_OBJECT
public:
    explicit PlotWindow(QWidget *parent=nullptr);
private:

};

// plotwindow.cpp

#include "plotwindow.h"
#include <qwt/qwt_text.h>
PlotWindow::PlotWindow(QWidget *parent)
    :QDialog(parent)
{
    QwtPlot *plot = new QwtPlot( "Test", parent );
    resize(233,222);
}

If I compile the code I get this error:

/home/p/store/c++/qt/qwt_test/plotwindow.cpp:6: error: no matching function for call to ‘QwtPlot::QwtPlot(const char [5], QWidget*&)’
    6 |     QwtPlot *plot = new QwtPlot( "Test", parent );
      |                                                 ^

Whats wrong here?

[pauledd]

ok, stupid me! I forgot to include Qwt in the *.pro file:

...
CONFIG += qwt
INCLUDEPATH +="/usr/include/qwt"
LIBS += -L/usr/lib -lqwt