SOURCE

function setup(){
    createCanvas(600,600);
    background(0);
}
function draw(){
    push();
    translate(mouseX,mouseY);
    scale(map(mouseX,0,600,0,1));
    fill(120);
    ellipse(0,0,100,100);
    pop();
    push();
    translate(mouseX,mouseY);
    scale(map(mouseX,0,600,0,2));
    fill(80);
    ellipse(200,0,200,200);
    pop();
    push();
    translate(mouseX,mouseY);
    scale(map(mouseX,0,600,0,4));
    ellipse(400,0,150,150);
    pop();
}

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