Since I've started programming in the first place I have always had an integer variable that would be used to trigger something at a certain moment. So in an infinite loop I would have something like
timeVariable++;
If (timeVariable >= 500){
doSomething ();
timeVariable -= timeVariable;
}
The problem is I never learned how to properly keep track of time and I fear that the faster a computer is the faster this will trigger. I have always used this to create bullets, rain, etc. Would anyone mind showing me a proper way to keep track of time to trigger events (preferably in libgdx)?