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Adding points to a shape layer with expressions
Hello I have an expression I am using that generates a sinewave L > R
My expression so far is:
S = effect(“Speed”)(“Slider”);
A = effect(“Amp”)(“Slider”);
F = effect(“Frequency”)(“Slider”);
R = effect(“Resolution”)(“Slider”);
W = effect(“Width”)(“Slider”);
P = [];
for (i=0; i<R; i++) {
P.push([W/R*i, Math.sin(time*S+i /(R/F))*A]);}
createPath(P, [], [], false)
I would like to add two points to the animation one at the start, one at the end in order to generate an area under the wave animation to be used for a fill
I would also like to change the sliders over time and fot the values at that time to be reflected in the sinewave, rather than generating a global effect.
Hope that makes sense?
Can you guys help?
Cheers – C
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12 Replies
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Maybe you start with the first point already in the array and add the last one after the loop?
S = effect("Speed")("Slider");
A = effect("Amp")("Slider");
F = effect("Frequency")("Slider");
R = effect("Resolution")("Slider");
W = effect("Width")("Slider");
P = [[0,A]];
for (i=0; i<R; i++) {
P.push([W/R*i, Math.sin(time*S+i /(R/F))*A]);}
P.push([W/R*i,A]);
createPath(P, [], [], true)
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if I wanted to translate the first point and the last point to say [0, 1080] and [W,1080] and to add them to the Sign wave – is there a way to do that? — – I am just starting with Loops and Push’s and haven’t quite got the right resourse to get them into my head.
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I’m not sure if this is what you mean:
S = effect("Speed")("Slider");
A = effect("Amp")("Slider");
F = effect("Frequency")("Slider");
R = effect("Resolution")("Slider");
W = effect("Width")("Slider");
P = [[0,1080]];
for (i=0; i<R; i++) {
P.push([W/R*i, Math.sin(time*S+i /(R/F))*A]);}
P.push([W,1080]);
createPath(P, [], [], true)
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Dan! — you are the man yet again — had trouble understanding it at first but it works beautifully – Thank you – C
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one more question — I have used a loop here and I am unsure how to add “tappering” by changing slider values for the sinewave over time?
Cheers – C
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Sorry, I don’t know what you mean by “tappering”.
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Argh yes – I am trying to get the look of a decaying sin wave on my shape
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.. and an alpha wave
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er — sorry what I mean to say (apolgies – I got deistracted earlier) — I want to show Alpha waves with options to increase frequency, width, speed, amplitude. “decay”? etc … on my shape layer … with the addition of a moveable start and end point (as you have solved already – thank you again) … hope that makes sense?? mmm
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