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Expression Help with moving a null layer to the left 120 pixels every 3 seconds
Every 3 seconds I’d like to move my null layer to the left by 120 pixels. I have to do this many times over. How can I write an expression to do this? I figure it’s pretty simple, but I have very little experience with expressions.
Thanks as always!
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5 Replies
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Hi
yikesmikes it’s my turn this time 😉hold_time=3;
l=Math.floor(time/hold_time)
value+[l*-120] -
Drats! Foiled again.
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This is perfect… almost. I guess I should have asked this in the first place. How can I ease in and out of each of these movements? I want the null to slide to the left, starting and stop in a smooth motion.
yikesmikes… I’m giving you another shot!
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Something like this maybe:
period = 3;
deltaX = -120;
easeTime = .5;t = time % period;
prevX = Math.floor(time/3)*deltaX;
nextX = prevX + deltaX;
currX = ease(t,0,easeTime,prevX, nextX);
value + [currX,0];Decrease “easeTime” to reduce travel time between positions.
Dan
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Or you could keyframe one cycle of the movment the way you like, ease keyframe for 3rd keyframe (and tweak its bezier if you want), then add this loop expression.
loop_out(“offset”,0)
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