Expressions: Leading zeros and decimal places.

[Colin Braley]

Here is an expression for source text that should add leading zeroes to a number. Just modify the amtOfZeroes variable and pick whip the nums variable to whatever the source of your number is.

//–Expression begins
nums = thisComp.layer(“Deep Lime Green Solid 1”).effect(“Slider Control”)(“Slider”);
amtOfZeroes = 10;
//–Do not modify below this line
isNeg = false;
if(nums < 0) { nums = Math.abs( nums ); isNeg = true; } sVal = Math.round( nums ) + ""; while(sVal.length < amtOfZeroes) { sVal = "0" + sVal; } if(isNeg) sVal = "-" + sVal; sVal //--Expression ends ~Colin

[Colin Braley]

Here is a a simple way to round a number to a specified amound of decimal places:
Just pick whip nums to something else and change the value of the numOfPlaces variable to make it round to a different number of decimal places.

//–Begin Expression
nums = thisComp.layer(“Deep Lime Green Solid 1”).effect(“Slider Control”)(“Slider”);
numOfPlaces = 3;
//–Do not modify below this line

function roundTo(number, places)
{
num = Math.round ( Math.pow(number, places) );
num /= Math.pow(10, places);
return num;
}

roundTo(nums, numOfPlaces)

//–End expression

~Colin

[Jakub Michalski]

Wow, great!

Would never thought of doing these loops for adding the zeros! Decimal places are perfect as well. Thank you very much – this will help me a lot in debugging my expressions!

[Colin Braley]

Glad I could help.
~Colin

[Drew Holzinger]

Thanks for the expression!
I’m using 1 decimal point.
How can i get it to always display the decimal point when the number is whole? e.g. “3.0” or “0.0”

also, I had to add ‘*10’ to the first line because the script was putting all the digits of the slider value behind the decimal (keyframed from 0.0 to 5.8 over 40 frames)

[Spencer Tweed]

I need this for a project I’m on so I went ahead and smashed all of these expressions together. Yes, it will also do what you want with the decimal places!

nums = PICKWHIP_VALUE_HERE;
amtOfZeroes = 10;
numOfDecimals = 3;

//------------------------------------------------------------

nums = nums.value.toFixed(numOfDicemals);

isNeg = false;
if (nums &lt; 0)
{
nums = Math.abs(nums);
nums = nums.toFixed(numOfDecimals);
isNeg = true;
}
numsArray = nums.split(".");
numsFloat = numsArray[0];
while (numsFloat.length &lt; amtOfZeroes)
{
numsFloat = "0" + numsFloat;
}
if(isNeg)
{
numsFloat = "-" + "0" + numsFloat;
}

numsFloat + "." + numsArray[1]

[Spencer Tweed]

Nice expressions! I modified a bit to suit my project and smashed your expressions together:

nums = PICKWHIP_VALUE_HERE;
amtOfZeroes = 10;
numOfDecimals = 3;

//------------------------------------------------------------

nums = nums.value.toFixed(numOfDicemals);

isNeg = false;
if (nums &lt; 0)
{
nums = Math.abs(nums);
nums = nums.toFixed(numOfDecimals);
isNeg = true;
}
numsArray = nums.split(".");
numsFloat = numsArray[0];
while (numsFloat.length &lt; amtOfZeroes)
{
numsFloat = "0" + numsFloat;
}
if(isNeg)
{
numsFloat = "-" + "0" + numsFloat;
}

numsFloat + "." + numsArray[1]

[Whitney Doug]

Any idea why this expression would be giving me the error: “Expected: )” on line 7, which I believe is this line: “if (nums < 0)”

[Dan Ebberts]

I’d guess it’s because the poster previewed the post, which converts all < characters to html code. Dan

[Spencer Tweed]

Can you post your expression? Can’t tell without seeing the code…

– Spencer