How i can plot result in my GUI ?

[21did21]

thank you a lot, i like this example !!!
i understand a little now

---

Added after 1 33 minutes:

i have try to plote something but it don't work (i don't show something)

This is my main.cpp

#include <qapplication.h>
#include <qwt_plot.h>
#include <qwt_plot_curve.h>
#include <vector>
#include "fonction.h"
 
using namespace std;
 
        int main(int argc, char **argv)
        {
            QApplication a(argc, argv);
            QwtPlot plot;
            QwtPlotCurve *curve = new QwtPlotCurve();
 
            for (int i=1;i<10;i++)
            {
            QPolygonF points;
            vector<double>coord;
            coord=fonction();
 
            points << QPointF( coord[0],coord[1] ) ;
 
            curve->attach( &plot );
            plot.replot();
            }
 
            plot.resize(600,400);
            plot.show();
 
            return a.exec();
        }

#include <qapplication.h>
#include <qwt_plot.h>
#include <qwt_plot_curve.h>
#include <vector>
#include "fonction.h"

using namespace std;

        int main(int argc, char **argv)
        {
            QApplication a(argc, argv);
            QwtPlot plot;
            QwtPlotCurve *curve = new QwtPlotCurve();

            for (int i=1;i<10;i++)
            {
            QPolygonF points;
            vector<double>coord;
            coord=fonction();

            points << QPointF( coord[0],coord[1] ) ;

            curve->attach( &plot );
            plot.replot();
            }

            plot.resize(600,400);
            plot.show();

            return a.exec();
        }

To copy to clipboard, switch view to plain text mode 

and my fonction:

#include <vector>
#include <ctime> // to generate random point
#include <cstdlib> // to generate random point
#include "fonction.h"
 
using namespace std;
 
vector<double>  fonction()
{
    vector<double> points;
    srand(time(0));
    points.clear();
 
    points.push_back(rand() % 1800);
    points.push_back(rand() % 500);
 
    return points;
}

#include <vector>
#include <ctime> // to generate random point
#include <cstdlib> // to generate random point
#include "fonction.h"

using namespace std;

vector<double>  fonction()
{
    vector<double> points;
    srand(time(0));
    points.clear();

    points.push_back(rand() % 1800);
    points.push_back(rand() % 500);

    return points;
}

To copy to clipboard, switch view to plain text mode 

and his header:

#ifndef FONCTION_H
#define FONCTION_H
 
std::vector<double>  fonction();
 
#endif // FONCTION_H

#ifndef FONCTION_H
#define FONCTION_H

std::vector<double>  fonction();

#endif // FONCTION_H

To copy to clipboard, switch view to plain text mode 

can you explain me, how i can plot this curve. I want to différente version: with line between point and without line