​

function setup() {

  createCanvas(400, 400);

}

​

function draw() {

  background(backGray);

  let dR = 10 * sin(frameCount * 0.15);

  let dG = 60 * cos(frameCount * 0.3);

  let dB = 50 * sin(frameCount * 0.05);

  fill(120 + dR, 200 + dG, 10 + dB);

  noStroke();

  strokeWeight(8);

  let dX = 10 * sin(frameCount * 0.1);

  let dY = mouseY * cos(frameCount * 0.02);

  let dW = 50 * sin(frameCount * 0.3);

  let dH = 100 * cos(frameCount * 0.1);

  ellipse(200 + dX, 200 + dY, 200 + dW, 200 + dH);

}

​

function mouseClicked() {

  backGray += 20;

}