​

var angle = 0;

function setup() { 

  createCanvas(400, 400);

  background(220);

} 

​

function draw() { 

  translate(width/2,height/2);

  var r = map(sin(angle*10),-1,1,50,150);

  var x = cos(angle)*r;

  var y = sin(angle)*r;

  //var x = map(noise(angle),0,1,0,400);

  ellipse(x, y, 20, 20);

  angle += 0.05;

}