QOpenGL QTimer, how do I animate this?

[8Observer8]

Use QOpenGLWindow with the frameSwapped signal. This is my example with Qt 6.7 that prints delta time to the console:

main.cpp

#include <QtCore/QElapsedTimer>
#include <QtGui/QOpenGLFunctions>
#include <QtGui/QSurfaceFormat>
#include <QtOpenGL/QOpenGLWindow>
#include <QtWidgets/QApplication>
 
class OpenGLWindow : public QOpenGLWindow, private QOpenGLFunctions
{
public:
 
    OpenGLWindow()
    {
        setTitle("OpenGL ES 2.0, Qt6, C++");
        resize(380, 380);
 
        QSurfaceFormat surfaceFormat;
        surfaceFormat.setSwapInterval(1);
        connect(this, SIGNAL(frameSwapped()), this, SLOT(update()));
        setFormat(surfaceFormat);
    }
 
private:
 
    void initializeGL() override
    {
        initializeOpenGLFunctions();
        glClearColor(0.2f, 0.2f, 0.2f, 1.f);
        m_elapsedTimer.start();
    }
 
    void resizeGL(int w, int h) override
    {
        glViewport(0, 0, w, h);
    }
 
    void paintGL() override
    {
        float dt = m_elapsedTimer.elapsed() / 1000.f;
        m_elapsedTimer.restart();
        qDebug() << dt;
        glClear(GL_COLOR_BUFFER_BIT);
    }
 
private:
    QElapsedTimer m_elapsedTimer;
};
 
int main(int argc, char *argv[])
{
    QApplication::setAttribute(Qt::ApplicationAttribute::AA_UseDesktopOpenGL);
    QApplication app(argc, argv);
    OpenGLWindow w;
    w.show();
    return app.exec();
}

#include <QtCore/QElapsedTimer>
#include <QtGui/QOpenGLFunctions>
#include <QtGui/QSurfaceFormat>
#include <QtOpenGL/QOpenGLWindow>
#include <QtWidgets/QApplication>

class OpenGLWindow : public QOpenGLWindow, private QOpenGLFunctions
{
public:

    OpenGLWindow()
    {
        setTitle("OpenGL ES 2.0, Qt6, C++");
        resize(380, 380);

        QSurfaceFormat surfaceFormat;
        surfaceFormat.setSwapInterval(1);
        connect(this, SIGNAL(frameSwapped()), this, SLOT(update()));
        setFormat(surfaceFormat);
    }

private:

    void initializeGL() override
    {
        initializeOpenGLFunctions();
        glClearColor(0.2f, 0.2f, 0.2f, 1.f);
        m_elapsedTimer.start();
    }

    void resizeGL(int w, int h) override
    {
        glViewport(0, 0, w, h);
    }

    void paintGL() override
    {
        float dt = m_elapsedTimer.elapsed() / 1000.f;
        m_elapsedTimer.restart();
        qDebug() << dt;
        glClear(GL_COLOR_BUFFER_BIT);
    }

private:
    QElapsedTimer m_elapsedTimer;
};

int main(int argc, char *argv[])
{
    QApplication::setAttribute(Qt::ApplicationAttribute::AA_UseDesktopOpenGL);
    QApplication app(argc, argv);
    OpenGLWindow w;
    w.show();
    return app.exec();
}

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[davidsanborn24]

How can the drawing methods in the "Hello-OpenGL" example be used for animation?