How to set timing for tween in generativepy

Tweens are entirely frame based. You define the tween sequence in terms of frame count, and you access the tween value using frame index.

If you want to use time, you will need to convert time into a frame index, using a function like this:

FRATE = 25

def time2frame(t):
   return int(time*FRATE)

Where FRATE is your desired frame rate. Higher values give more accurate timings, but make the tween array larger. A value of 25 makes each frame 0.02s long, which is fine for most uses.

Then to create a tween you can use something like:

tween = Tween(0.0).to(1.0, time2frame(10.0)).to(0.0, time2frame(5.0))

This example creates a tween that lasts for 15 seconds. It starts at zero, rises to 1.0 over the first 10 seconds, then falls back to zero over the next 5 second.

To get the tween value at, say, 7.2 seconds, use:

value = tween[time2frame(7.2)]

Hope that helps.