// Simple class to compute frames-per-second.
class Chronometer
{
    Chronometer()
    {
        lastmillis = 0;
        fcount = 0;  
        interval = 5;
        updated = false;        
    }

    Chronometer(int t)
    {
        lastmillis = 0;
        fcount = 0;  
        interval = t;
        updated = false;
    }  
  
    void update()
    {
        fcount++;      
        int t = millis();
        if (t - lastmillis > interval * 1000)
        {
            fps = float(fcount) / interval;
            time = float(t) / 1000;
            fcount = 0;
            lastmillis = t;
            updated = true;
        }
        else updated = false;
    }
    
    void printfps()
    {
        if (updated) println("FPS: " + fps);
    }
    
    int fcount;
    int lastmillis;
    int interval;
    float fps;
    float time;
    boolean updated;    
}