Sine
Smoothly scaling size with the sin() function.
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let diameter;
let angle = 0;
function setup() {
createCanvas(710, 400);
diameter = height - 10;
noStroke();
fill(255, 204, 0);
}
function draw() {
background(0);
let d1 = 10 + (sin(angle) * diameter) / 2 + diameter / 2;
let d2 = 10 + (sin(angle + PI / 2) * diameter) / 2 + diameter / 2;
let d3 = 10 + (sin(angle + PI) * diameter) / 2 + diameter / 2;
ellipse(0, height / 2, d1, d1);
ellipse(width / 2, height / 2, d2, d2);
ellipse(width, height / 2, d3, d3);
angle += 0.02;
}
