QOpenGL QTimer, how do I animate this?

[wysota]

Could you give me an example on how to do this, I have no clue how to implement that?

Have a look at the Animation Framework docs.

[JerichoJosh]

Could you help me to implement a QTimer?
the documentation you gave me remains too abstract for me, and mostly related to qPainter

[anda_skoa]

I think what you will have to do is change values in your time slot and then call updateGL()

That will result in another call to paintGL() in which you can update your GL data.

Cheers,
_

[wysota]

Could you help me to implement a QTimer?
the documentation you gave me remains too abstract for me, and mostly related to qPainter

There is not a single reference to QPainter in the documentation I gave you.

[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?