-
Count numbers up and down from array
Hi,
I’m working on a video that show info about amount of sale in malls in one country in 24 h. I need to show a different number for every hour. I wrote an expression but it only shows the last pass. As you can see, I have an array and I want the counter to grab 1st number and count to 2nd, grab 2nd and count to 3rd etc.
I’ll be grateful for any ideas.Magda
walmart = [ 498, 306, 68, 116, 130,146, 478, 1318,2328, 2904, 2818, 3246, 3536,3066,3030,2938,3342, 3222,3088,2730,2446,2792,2634,1838];
for(i=0; i < 23; i++){
startCount = walmart[i];
endCount = walmart[i+1];
countDur = 5;
Math.round(linear(time,0,countDur,startCount,endCount))
} -
5 Replies
-
you’re pretty close… you just don’t need to use a loop, you just need to break your time into 5 second chunks, then interpolate between the values during each chunk…
i think this should do what you need:
walmart = [498, 306, 68, 116, 130,146, 478, 1318, 2328, 2904, 2818, 3246, 3536, 3066, 3030, 2938, 3342, 3222, 3088, 2730, 2446, 2792, 2634, 1838];countDur = 5;
n = Math.floor(time/countDur);
startCount = walmart[n];
endCount = walmart[n+1];Math.round(linear(time%countDur, 0, countDur, startCount, endCount))
Kevin Camp
Art Director
KCPQ, KZJO & KRCW -
Hi Kevin,
Thank you for your answer. It works but not 100% correctly. There is no limit for n so when there are no more elements in array, it crashes. “Class ‘aray’ has no property or method named ’24’.
Magda
-
if your comp is longer than the value array then the expression will exceed the length of the array unless you prevent that from happening.
there are a number of ways to do that, but clamp() might be the easiest.
try changing this line:
n = clamp(Math.floor(time/countDur), 0, walmart.length-1);
Kevin Camp
Art Director
KCPQ, KZJO & KRCW -
I’m sorry, but there is another mistake. It crashes on 24 again, so I tried n = clamp(Math.floor(time/countDur), 0, walmart.length-2); and it loops between two last elements of the array. I can try with ending the comp before it crashes.
-
sorry about that, i didn’t have after effects in front of me to test, and should have caught that anyway…
you’ll need a if/else to catch it:
walmart = [498, 306, 68, 116, 130,146, 478, 1318, 2328, 2904, 2818, 3246, 3536, 3066, 3030, 2938, 3342, 3222, 3088, 2730, 2446, 2792, 2634, 1838];
countDur = 5;
n = Math.floor(time/countDur);
if (nKevin Camp
Art Director
KCPQ, KZJO & KRCW
Reply to this Discussion! Login or Sign Up