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Move from position to position by x and then y
Hey All,
I’m trying to cook an expression where a layer will move around the comp to a number of keyframed positions, but rather than move ‘as the crow flies’ it moves first in the x dimension and then the y.
I’ve been looking at the ‘nearestKey’ command and ‘.key’, but I can’t quite figure it out.
I thought maybe you could treat each move as a right angled triangle, where the direct move is the hypotenuse and then you could use trig to figure out the x and y… but again, my brain has failed me.
It doesn’t help that it’s my first day back after christmas either!
Any pointers will be greatly appreciated.
P
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2 Replies
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Try this:
v = value;
if (numKeys > 0){
n = nearestKey(time).index;
if (key(n).time > time) n--;
if ((n > 0) && (n < numKeys)){
t = time - key(n).time;
dt = key(n+1).time-key(n).time;
if (t < dt/2){
v = linear(t,0,dt/2,key(n).value,[key(n+1).value[0],key(n).value[1]]);
}else{
v = linear(t,dt/2,dt,[key(n+1).value[0],key(n).value[1]],key(n+1).value);
}
}
}
v
Dan
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Dan, You nailed it again!
Awesome.
Many thanks.
Pete
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