Race car game, car moving faster on faster computer

Question

I understand why it does that but I don't really have any idea of how to prevent that. So the scenario is, every frame I move the car by a certain of predefined pixels. What happens is when I go on slow or faster computer... well I get less or more frames per seconds so the car moves either slower or faster. I was wondering how I could prevent that.

I suspect that I would have the same problem using any library... This is my first time doing real time stuff like that.

Answer 1

I suspect your current code looks somehow like this

 // to be called every frame
 void OnEveryFrame()
 {
     MoveCar();
     DrawCarToScreen();
 }

But it should be like this:

 // to be called - for example - 50 times per second:
 void OnEveryTimerEvent()
 {
     MoveCar();
 }

 // to be called every frame
 void OnEveryFrame()
 {
     LockTimerEvents();
     DrawCarToScreen();
     UnlockAndProcessOutstandingTimerEvents();
 }

You have to set up an according timer event, of course.

Answer 2

Move car according to timers and not framerate. i.e. Car model should be independent of the display representation.