CODEWITHSUNDEEP
javamathframe-rate
TheAustralianBirdEatingLouse
TheAustralianBirdEatingLouse

Reputation: 41

FPS Counter in Java

So, I'm making a game, and I want an FPS Counter, however I've got no clue what the math I should do behind it is. My previous counter worked, but it only updated every second due to the math. I want something constantly updating, but I just don't know how to make it. As far as I can tell, the easiest way to do this is to have a frame counter, and every frame it looks at the frames it's done so far and the time elapsed/time left and models the current frames for the rest of the second and displays that. That seems like a good theory, but I don't really know how to put it into practice. I know I'll need to use System.currentTimeMillis and such. Any help would be greatly appreciated! Thanks!

EDIT 1

Here's my FPS code here:

double getFPS(double oldTime) {
    double newTime = System.nanoTime();
    double delta = newTime - oldTime;

    double FPS = 1 / (delta * 1000);
    FPSOldTime = newTime;

    return FPS;
}

Upvotes: 1

Views: 6900

Answers (1)

inimene
inimene

Reputation: 1650

I implemented something like that in C++. I imagine it should work in Java also. The first line in the function has to use the Java time method tough. 

double get_fps(double old_time) {
// Something like that in java  double new_time = System.getTime().nanoseconds();
    double delta = new_time - old_time;
    double fps = 1 / (delta * 1000);
    old_time = new_time;
    return fps;
};

Format the double with something like this: %2.0f

PS. (Run it in your game loop and the old time has to be initialized before game loop. You will be changing it via a reference.)

Upvotes: 1

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