How do you guys display FPS to the screen?
int fps = 60;
t0 = system.nanoTime();
t1 = system.nanoTime();
long delta = ((1E+9)*1.0/fps) - (t1-t0);
g.drawString("FPS:"+ (1E+9)*1.0/delta, 0,0);
This is how I currently do it and there are so many problems with it:
- Delta may be negative due to bad resolution
- Delta does NOT take into account time spent calling g.drawstring and buffer.show
- The sleep may be accurate within margins of error by calling system.nanoTime() inside sleep() but this makes for inaccurate display
- If t1 is too long delta becomes negative. Do you play catchup with the framerate by sleeping a shorter time next iteration?
I see no way of circumventing the second point, display to console would be much easier, you could wrap all of it in a method, measure time between each method-calls and print it to console. But any displayed FPS must take the delta THEN display it.