Constant motion along a single axis

Question

Hello!

Looking for some help with a heart rate monitor effect in After Effects.

I have the heart rate drawn out as a path and have "Trimmed Paths' to animate the path.

I am trying to figure out how I can have the path animate along the x-axis at a constant rate. So while the path will still need to move up and down the y-axis when the heart beats, the movement of the y-axis wont affect the speed that the x-axis is travelling at.

Let me know if I can show you anything that will help explain this better

Many thanks!

Dan Ebberts · Accepted Answer

Because of the nature of your graph (x is always increasing), you can probably get away with something like this on your Trim Paths End property.

resolution = .01;
p = content("Shape 1").content("Path 1").path;
v = p.points();
xStart = v[0][0];
xEnd = v[v.length-1][0];
d = xEnd- xStart;
curX = xStart + d*value/100;
x = 0;
while (p.pointOnPath(x)[0] < curX && x < 1){
  x += resolution;
}
x*100

KieferMcGinn · Answer

Here is a clip of the animation I have so far, you can see how the speed along the x-axis slows as it travels up the y-axis to create the heart beat shape. Is there a way to make the path move at a constant rate along the x-axis, so it would shoot up the y-axis quickly to maintain the speed along the x-axis?

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