Sinc Math.Sin() with the Wave Warp Effect

[Andreas Woelfl]

I try to continue this post for my next related problem.

Next to the circle there should be more of them, each one liningup the wave as well.
I regulate the distance of the other circles next to the main one with an Expression Slider.

All the layers are at the top of the comp timeline:

Index 1: Circle 1 (Main Circle)
Index 2: Circle 2
Index 3: Circle 3
Index 4: Circle 4

… you get the idea

As I understand I should only change the phase of the Math.sin for everyone.
I am searching for a formula including the distance of the circles and their index (just to add more circles if necessary).

My math is really rusty and everything I tried so far did not work out.

Here is what I got so far. It points in the direction I want to go but still does not line up correctly. (I changed the circles with small crosses to see how it lines up):
9473_sinustest.aep.zip

Any ideas?

Thanks a lot!

Here the expressions I used so far.

// X POSITION
var xDistancia = (content("Ellipse 1").content("Ellipse Path 1").size[0]) + (thisComp.layer("Adjustment Layer 8").effect("xDistance")("Slider"));

var xPos = thisComp.layer(thisLayer, -1).transform.position[0] - xDistancia;

//Y POSITION
var amplitude = thisComp.layer("Background 04 Bottom 3").effect("Wave Warp")("Wave Height");
var frequency = Math.PI;

var yDelay = (thisComp.width/transform.position[0])*thisComp.layer("Adjustment Layer 8").effect("yDelay")("Slider");
var phase = yDelay*index

yPos = transform.position[1] + amplitude * Math.sin(frequency*time+phase);

[xPos, yPos]

[Kalleheikki Kannisto]

// X POSITION
xDistancia = thisComp.layer("Adjustment Layer 8").effect("xDistance")("Slider");
xPos = thisComp.layer(thisLayer, -1).transform.position[0] - xDistancia;

//Y POSITION
amplitude = thisComp.layer("Background 04 Bottom 3").effect("Wave Warp")("Wave Height");
frequency = Math.PI;
phase_offset = (index-1)*Math.PI*(xDistancia/thisComp.layer("Background 04 Bottom 3").effect("Wave Warp")("Wave Width"));
yPos = transform.position[1] + amplitude * Math.sin(frequency*time+phase_offset);

[xPos, yPos]

In essence, since one full wave length is PI, you can use X_distance divided by wave length (multiplied by Math.PI) for the phase offset (Which makes the “Y Delay” slider unnecessary).