SOURCE

function setup(){
    createCanvas(600,600)
    background(255)
    ellipseMode(CENTER)
    }
function draw(){
    background(255,500)
    push()
    translate(30,30)
    scale(map(mouseX,0,200,0,2))
    fill(60,50,20)
    ellipse(0,0,20,20)
    pop()
    push()
    translate(300,300)
    scale(map(mouseX,200,400,0,7))
    fill(200,130,80)
    ellipse(0,0,50,50)
    pop()
    push()
    translate(400,400)
    scale(map(mouseX,400,600,0,3))
    fill(360,80,20)
    ellipse(0,0,100,100)
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.1.9/p5.min.js"></script>