With this iExpression you can place layers in a straight line. For horizontal or vertical lines, you can also use the 'Align Layers in Row' or 'Align Layers in Column' iExpressions, if you don't need the advanced parameters like the wiggle.
First Layer (Name or Index)
is the name or index of the first layer that should be placed on the line.
Last Layer (Name or Index)
is the name or index of the last layer that should be placed on the line.
is the starting point of the line on which the layers should be distributed.
is the ending point of the line on which the layers should be distributed.
Use Keyframe Value as Offset
adds the keyframed value to the position on the line. Hence, all layers except the first and the last one are then only placed exactly on the line when their keyframed position is (0,0). Other values cause a corresponding offset and allow to animate the position relative to its placement on the line.
makes the layer wiggle around its position on the line with the given frequency. If you don't want it to move at all, set the frequency to 0.
denotes up to how much the layer may move away from its position on the line. To create a little less regular but still not moving line, set the frequency to 0 and the amplitude to some value greater 0.
Wiggle On Line
makes the layers stay exactly on the line while they wiggle. In other words, it only wiggles in the direction of the line.
with an offset of one, the first layer is removed from the beginning of the line and added again at the end behind the last layer. For an offset of 2 this happens for the first two layers etc.