QTchart

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include
#include
using namespace QtCharts;

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private:
    Ui::MainWindow *ui;

private:
    QChartView *chartview;
    QChart *chart;

    void CreateChartFunction();
};
#endif // MAINWINDOW_H

-----------------------------------------

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    setWindowTitle("chart");
    CreateChartFunction();
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::CreateChartFunction()
{
    chartview = new QChartView(this);

    chart = new QChart();
    chart->setTitle("sin and cos chart test");

    chartview->setChart(chart);
    this->setCentralWidget(chartview);

    QLineSeries *series1=new QLineSeries();
    QLineSeries *series2=new QLineSeries();
    series1->setName("sin curve");
    series2->setName("cos curve");
    chart->addSeries(series1);
    chart->addSeries(series2);

    qreal t=0,y1,y2,intv=0.1;
    int icount=100;
    for(int i=0;i     {
        y1=qSin(t);
        series1->append(t,y1);

        y2=qCos(t);
        series2->append(t,y2);

        t=t+intv;
    }

    QValueAxis *axisX=new QValueAxis;
    axisX->setRange(0,10);
    axisX->setTitleText("time(seconds)");

    QValueAxis *axisY=new QValueAxis;
    axisY->setRange(-2,2);
    axisY->setTitleText("values");

    chart->setAxisX(axisX,series1);
    chart->setAxisY(axisY,series1);

    chart->setAxisX(axisX,series2);
    chart->setAxisY(axisY,series2);
}