SketchBook

function setup() {
createCanvas(300, 300);
background(250, 250, 250);
strokeWeight(3);
var enx;
var eny;
}

function draw() {
enx=mouseX;
eny=mouseY;
ellipse(0, 150, enx+enx);
ellipse(300, 150, enx+enx);
ellipse(150, 0, eny+eny);
ellipse(150, 300, eny+eny);
}