y=value[1]-sourceRectAtTime(time).height/2;[0,y]
y=value[1]-sourceRectAtTime(time).height/2; [0,y]
Control shape layer position with a Null - works like parenting, but keeps the relative position of your shape layer.
Generate a random number
Constrain wiggle to One Dimension (X or Y). NOTE: Wiggles X dimension. For Y dimension only, change last line to [value[0],w[1]]
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