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Expression to count up every X amount of frames
Hi all!
I’m currently working on an animated data visualisation, and I’m having issues syncing up my animated timeline with my data points on the chart. The timeline looks like this:
The marker moves along the timeline from left to right, whilst the day marker to the right counts up.
In the expression for the data points, each day has a duration of 3 frames. So 0:00:00:00 = val1, 0:00:00:03 = val2, 0:00:00:06 = val3 etc.
I’ve used a slider control for the day marker (setting start and end values to 1 and 29/30/31 respectively), with this expression in Source Text:
Math.round(effect("Slider Control")("Slider"))However it doesn’t exactly sync up with the data – some days get 4 frames, some get 3 etc. Is it a rounding issue?
I think I need to create some kind of integer counter that counts up every 3 frames exactly – can anybody help?
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5 Replies
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If it helps, this is how I’ve managed to get it working with keyframes… there must be a way to automate this though!
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I’m not clear on what you’re doing, but something like this might fit in there somewhere:
Math.floor(effect(“Slider Control”)(“Slider”)/3)*3
Dan
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Hi Dan, thanks for your suggestion. That’s not quite what I need though – I’ve just tried it out and it’s counting up in 3’s, I need it to increment by 1.
Basically what I need is a counter that counts up from 1 – 30, with each number having an exact 3 keyframe duration. I think my issue with using a slider is I end up dealing with floating point precision, which makes the distribution of keyframes slightly uneven.
I’ve achieved it manually by using toggle hold keyframes on the slider property, ie 0:00:00:00 → Slider = 1, 0:00:00:03 → Slider = 2, 0:00:00:03 → Slider = 3 etc.
Does that make sense? Let me know if there’s any other salient points I’ve missed!
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Hi, this should do what you are looking for
t=timeToFrames();
frameStep=3;
days=30;
Math.floor(t/frameStep)%days+1
this counts to 30 (or any number you put for “days”) every 3 frames (or any number you put for “frameStep”), starting at 1 and resetting back to 1 after 30.
If you want to stop at 30 try this:
t=timeToFrames();
frameStep=3;
f=Math.floor(t/frameStep)+1;
if (f>30){30}else{f}; -
Hi Robert – that’s it! Thanks a million
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