4

function setup() {

  createCanvas(windowWidth, windowHeight);

  background(0);

  rectMode(CENTER);

}

​

function draw() {

  translate(width / 2, height / 2);

​

  let colorValue = map(sin(millis() / 1500), -1, 1, 0, 255);

  let alphaValue = map(cos(millis() / 1000), -1, 1, 50, 200);

  let strokeWeightValue = map(sin(millis() / 2000), -1, 1, 1, 10);

​

  fill(colorValue);

  stroke(colorValue);

  strokeWeight(strokeWeightValue);

​

  ellipse(0, 0, 200, 200);

}

​