Measure FPS

[chilliboy999]

Hey guys,
i thought of a way to measure fps.
So, i came up with the following idea:

C# Code:

        private void Render()
        {
            while (renderWin.IsOpen())
            {
                MeasureFPS();
                renderWin.Clear();
                renderWin.DispatchEvents();
                renderWin.Draw(spPlayer);
                renderWin.Draw(txtFps);
                renderWin.Display();
            }
        }
        private void MeasureFPS()
        {
            fps++;
            if (DateTime.Now.Subtract(lastTimeMeasured).Seconds > 1)
            {
                txtFps.DisplayedString = "FPS: " + fps.ToString();
                lastTimeMeasured = DateTime.Now;
                fps = 0;
            }
        }
 

Is this a valid way to determine my fps?
Cause i have about 4000 per second.

[AlexAUT]

Yes, this as a valid way but it isn't 100% accureate. Because DateTime.Now.Subtract(lastTimeMeasured) could be around 1.01 seconds, but you can ignore that. The difference is smaller than 1.

Edit: you should write

if (DateTime.Now.Subtract(lastTimeMeasured).Seconds >= 1.F)

AlexAUT

[chilliboy999]

Ah ok thanks
And it is like you say

>= 1

cause

> 1

equals 2 seconds and more;)
I didnt see that at the first time

[AlexAUT]

I found in the microsoft documentation that the DateTime is inaccurate, high resolution. So if you want to measure the FPS accurate you should use a stopwatch http://msdn.microsoft.com/en-us//library/system.diagnostics.stopwatch(v=vs.110).aspx



AlexAUT

[chilliboy999]

Thank you for the hint
Now i'm using stopwatch.

Btw. Schöne Grüße nach Österreich

[AlexAUT]

Btw. Schöne Grüße nach Österreich

Kein Problem, danke und frohe Weihnachten! 


AlexAUT

[chilliboy999]

Kein Problem, danke und frohe Weihnachten! 

Danke
Die wünsch ich dir auch

[zsbzsb]

If you are looking for SFML style sf::Clock and sf::Time classes I have a nice implementation of them in my NetEXT library (see my signature).

[chilliboy999]

Thanks zsbzsb for your suggestion
hmm... so many possibilities.
It's difficult to take a decision

[zsbzsb]

Well maybe this will help you make a decision. Internally NetEXT Clock/Time classes use a Stopwatch, however if you want a high resolution timer you must use Stopwatch.ElapsedTicks (and then you need to deal with conversions). NetEXT Clock/Time internally use ticks to provide high resolution time measurement. Including overridden operators to easily add/subtract/multiply time.

It is much cleaner IMO to use NetEXT and get high resolution timer than trying to do all the conversions directly from Stopwatch in your own code. (not to mention you can then directly convert most SFML code that uses sf::Clock and sf::Time) 

[chilliboy999]

It sounds like that NetEXT would be the most simple and accurate possibility