After Effects:Â custom counter expression
I'm working in After Affects for a college institutional video and I'm making a timeline that needs numbers counting.
That part I figured out. Using expression & slider control and voila my numbers are counting.
The thing is the numbers increment from left to right, and only show the amount of numbers that are currently representing.
- 1, 2, 3, 5, 10, 11, 234, etc
And what i wanted to do is this:
- 0001, 0002, 0003, 0010, 1940, 2006, etc
Making them start with 4 numbers, and incrementing the zeros ahead.
wide_eyed_pupil's answer is correct, I'll give you a practical example...
Set up your slider control and an expression on your text layer's "Source Text". In the expression you want to get your slider value like so:
val = Math.round(thisLayer.effect("Slider Control")("Slider"));
Math.round() just makes sure we have an integer, the rest just pulls the "Slider" value from the correct effect and layer.
Then assuming we want 4 digits, we append our slider value to 4 "0"s (as a string), then use
slice() to return the last 4 digits of the whole string (if you want a different number of digits then just add enough "0"s and change the offset you give to
('0000' + val).slice(-4)
Which should look like this:
typically you do this with a number formatting patch in other applications, not sure about expressions but if you can convert to text concatenate "0000" with n where n is your incrementing number and then substring the right 4 characters. check the docs for string operations to see if possible.