Calcultate fps

[apap_]

Hi,

I want to display number of frame per second (fps) in my user interface, is there a simple way to do this in Qt ? and in QML ?

Regards

[sigrid]

The example below illustrates how this can be done, it is based on how this is done internally in Qt:

@class FPS : public QWidget
{

public:
FPS() : m_frameCount(0) {}

void paintEvent(QPaintEvent *e) {
    if (m_frameCount == 0) {
         m_time.start();
    } else {
        printf("FPS is %f ms\n", m_time.elapsed() / float(m_frameCount));
    }
    m_frameCount++;

    // Painting goes here...

}

QTime m_time;
int m_frameCount;

};@

[apap_]

Nice, thanks for answer.

[mchiasson]

That would gave you 'time elapsed per frame'. If you want 'frame per second' (FPS), your printf should be:

@printf("FPS is %f\n", m_frameCount / (float(m_timer.elapsed()) / 1000.0f));@