Delta Time and Animation

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TomToad

What I usually do is I calculate the number of milliseconds between frames, then I can find out what frame I need to display. For instance, if I wanted to cycle an animation at 15 FPS then the number of milliseconds would be 1000/15. That would be 66.66666 mpf(milliseconds per frame). I would round it up to 67 mpf. Then I'd need to store the time the animation started. From there, just find out how much time has passed, devide by mpf, and Mod by the number of frames.

Const MPF = 67
Const NumFrames = 8

Local Frame:int

Local AnimStart:Int = Millisecs()
Local TimePassed:Int
...Some code goes here

TimePassed:Int = Millisecs() - AnimStart
Frame = (TimePassed/MPF) Mod NumFrames
DrawImage(AnimatedImage,X,Y,Frame)
...Some more code

That's off the top of my head, hopefully I didn't confuse you by introducing any mistakes.