var circle = ...create a circle
var circleCached = circle.clone();
var mousePoint = new Point(0, 0);

// onMouseMove
var tool = ...initialize a Tool()
tool.onMouseMove = function (event) {
  mousePoint = event.point;
}

// onFrame
view.onFrame = function (event) {
  // Animation 1: Automatic circular rotation of each segment
  for (var i = 0; i < circle.segments.length; i++) {
    var offsetRotation = new Point(Math.cos(event.time + i * 2), Math.sin(event.time + i * 2)).multiply(15);
    circle.segments[i] = circleCached.segments[i].add(offsetRotation);
  }

  // Animation 2: the circle moves following the mouse movements with transition
  var delta = mousePoint.subtract(circle.position).divide(15);
  circle.position = circle.position.add(delta);
}