SOURCE

function setup(){
createCanvas(900,900);
background(0);
}
function draw(){
push();
translate(mouseX,mouseY);
scale(map(mouseX,0,300,100,1));
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));
fill(40);
ellipse(400,0,150,150);
pop();
push();
translate(mouseX,mouseY);
scale(map(mouseX,0,500,0,7));
fill(20);
ellipse(600,0,100,100);
pop();
}