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Expression to Change Scale Value to 100 at the end of the Composition no Matter How Long
I didn’t know what to put in the title, but anyways.
I’m currently working with progress bars, and the way i make them is with keyframes.
1 at the start and 1 at the end, the problem is that i’m working on a template for a client, and i want it to be as simple as possible.So i don’t want my client to change the end keyframe every time he has to render it, i’m not too experienced with expressions yet so i have no idea.
I would be fine with just having a slider where you put the length of the comp in seconds, and it will move the keyframe to that point in the comp.
Or just change the scale value to 100 and that point in the comp, or something similar.If there’s no way to do such a thing, i might need to find a new way to create my progress bars.
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9 Replies
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Something like this will probably work:
t = time;
if (numKeys > 1){
t1 = key(1).time;
t2 = key(numKeys).time;
t = linear(time,t1,thisComp.duration,t1,t2);
}
valueAtTime(t);
Dan
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It might just be me who doens’t know how to you the expression correctly, but it doens’t seem to have any effect on either the scale or a slider control. The value of the slider controls stays at 0 no matter how long on the time line it is, same with the scale.
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You need to put it on a property that has at least two keyframes.
Dan
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Yes it works !
Thanks alot Dan, i will save this expression for future use.
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Just 1 last question, is it possible to set it to the length of another composition ?
I’m just curious.
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With an expression? No, an expression can’t set the length of a composition.
Dan
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I meant like with the expression you gave earlier, can you make it apply to another composition ?
Like let’s say i have a “main” composition and a “render” composition, and the progress bar is in the main comp.
Can it apply to the render comp’s length instead of the main comp ?On another subject, can you make any expression that apply to another comp ?
Like if you have a “Control” layer in “comp 1” and you want to for example
link the color of a fill in “Comp 2” to a color control on the Control layer.Is that possible ?
That is my last question before i move on in life.
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I think this is what you’re asking for:
t = time;
if (numKeys > 1){
t1 = key(1).time;
t2 = key(numKeys).time;
t = linear(time,t1,comp("render").duration,t1,t2);
}
valueAtTime(t);
>… can you make any expression that apply to another comp ?
Sure, you’d have the expression on the Fill Color in Comp 2 and it would refer to the control in Comp 1.
Dan
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I see, thank you.
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