var y = 200;

function setup() {

  createCanvas(400, 400);

   frameRate(5);

}

​

function draw() {

  if (mouseIsPressed === true){

  x = x + random(-2,2);

  y = y + random(-2,2);

  }

  background(220);

  fill(255,255,0);

  ellipse(x,y,50,50);

  fill(0);

  ellipse(x-10,y-10,5,10);

  ellipse(x+10,y-10,5,10);

  fill(255,51,51);

  arc(x, y, 20, 20, 0, PI, CHORD);

  var dir = int(random(4));

  if(dir === 0){

    x = x + 20;

  }

  else if(dir === 1){

    x = x - 20;

  }

  else if(dir === 2){

    y = y + 20;

  }

  else if(dir === 3){

    y = y - 20;

  }

}