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Animating a rollover effect with expressions
Hi there,
I have been given the unenviable task of animating a large number of buttons in a video presentation of a user interface. There are nearly 100 buttons which i have created a roll on and roll off animation for, but rather than manually adding the keyframes to each button when the cursor rolls on and off (which would take ages) I was wondering if there was any way of automating the process using expressions.
I was considering using time remapping, but then how to control the time remap with information about where the cursor is? ideally I would like to be able to trigger the animations for each button using information about the location of the cursor. Is this at all possible? I am relatively new to expressions so I have no idea if what I’m asking is impossible.
I would greatly appreciate your help
Cheers
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3 Replies
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It’s hard to picture how you have things set up but if you already have each button animated, you could certainly create an expression that controls time remapping based on the distance from your cursor layer.
Or, you could control whatever attributes you’ve animated (scale, ???) directly with expressions, again based on the distance from the cursor. the best approach would depend on the specifics of your project.
Dan
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Hi there,
Basically what I have is a row of buttons with a simple eased scale up and down animation for when the cursor moves over them, just like the mac os dock. During the course of the video the cursor will move over the buttons a number of times, at different speeds and angles etc, and I was wondering if there was a way of automating that without manually adding keyframes to every button every time the cursor moves over them.
Cheers!
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OK – two examples. First, if you have your scale animation pre-comped so you can turn on time remapping, you could use a time remapping expression like this:
minDist = 50;
maxDist = 500;
minTime = inPoint;
maxTime = outPoint – thisComp.frameDuration;C = thisComp.layer(“cursor”);
dist = length(C.toWorld(C.anchorPoint),toWorld(anchorPoint))
linear(dist,minDist,maxDist,maxTime,minTime)Or, you might just control the scaling directly with a scale expression like this:
minDist = 50;
maxDist = 500;
minScale = 50;
maxScale = 200;C = thisComp.layer(“cursor”);
dist = length(C.toWorld(C.anchorPoint),toWorld(anchorPoint))
s = ease(dist,minDist,maxDist,maxScale,minScale);
[s,s]Dan
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