​

function setup() {

  createCanvas(400, 400);

  center = createVector(width/2,height/2);

  m  = createVector(mouseX,mouseY);   // from origin not center!!

}

​

function draw() {

  background(0,0,80);

  mouse();

  eye(-30,0);

  eye(+30,0);

}

​

function mouse() {

  m.set(mouseX,mouseY);

  circle(m.x,m.y,3);

}

​

function eye(offx,offy) {

  push();

  fill(200,200,0);

  circle(center.x+offx,center.y+offy,40);

  fill(0,200,0);

  circle(center.x+offx+10,center.y+offy+10,10);

  pop();

}

​