4-1A

function setup() {

  createCanvas(windowWidth, windowHeight);

  background(100);

}

var r=100

function draw() {

  r=mouseX

  var brightnessR = r/2 +40

  var brightnessG = mouseX/2 +40

  var brightnessB = mouseY/2 +40 + mouseX/5

  fill(brightnessR, brightnessG, brightnessB)

  var darkR = brightnessR/2

  var darkG = brightnessG/2

  var darkB = brightnessB/2

  fill(darkR, darkG, darkB)

  ellipse(width/2, height/3, r, r);

  ellipse(width/2, height/2, r, r);

  ellipse(width/2, height/3*2, r, r);

}