function setup(){
createCanvas(500,500);
background(255);
}
function draw(){
push();
translate(mouseX,250);
scale(map(mouseX,0,600,0,1));
ellipse(0,0,100,100);
pop();
push();
translate(mouseX,250);
scale(map(mouseX,0,600,0,2));
ellipse(200,0,200,200);
pop();
push();
translate(mouseX,250);
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>