let radius = 100;  // distance to center

​

function setup() {

  createCanvas(400, 400);

}

​

function draw() {

  background(255);

  let centerX = width/2;  // rotating around the

  let centerY = height/2; // center of the screen

​

  // we use sin() and cos() to get how much

  // the ellipse is to the right (dx) and bottom

  // (dy) of the center based on the angle and

  // the radius you want

  let dx = cos(radians(angle)) * radius;

  let dy = sin(radians(angle)) * radius;

  // put center and offset together to get

  // screen coordinates

  let x = centerX + dx;

  let y = centerY + dy;

​

  // voila!

  console.log('ellipse is at ' + x + ', ' + y);

  ellipse(x, y, 10, 10);

​

  // here you can decide how fast your circle

  // should rotate

  angle++;

}