Script 2-1-2

/**
 * Copyright Fumio ( http://wonderfl.net/user/Fumio )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/hXYp
 */

package {
  import flash.display.Sprite;
  import flash.events.Event;
  public class BallFollowingMouse extends Sprite {
    private var ballCount:uint = 50;
    private var speed:Number = 0.2;
    public function BallFollowingMouse() {
      for (var i:uint = 0; i < ballCount; i++) {
        addChild(new Ball(this, 200));
      }
      addEventListener(Event.ENTER_FRAME, followMouse);
    }
    private function followMouse(eventObject:Event):void {
      dispatchEvent(new BallEvent(BallEvent.FOLLOW, mouseX, mouseY, speed));
    }
  }
}
import flash.display.Sprite;
import flash.display.Graphics;
import flash.events.Event;
class Ball extends Sprite {
  private const deceleration:Number = 0.2;
  private var angle:Number;
  private var radius:Number;
  private var sizeRate:Number = 0.1;
  public function Ball(timeline:Sprite, maxRadius:Number) {
    var randomRate:Number = Math.random();
    angle = 2 * Math.PI * Math.random();
    radius = maxRadius * randomRate;
    createBall(randomRate);
    timeline.addEventListener(BallEvent.FOLLOW, follow);
  }
  private function createBall(randomRate:Number):void {
    var myGraphics:Graphics = graphics;
    myGraphics.beginFill(Math.floor(0xFFFFFF * randomRate) + 1);
    myGraphics.drawCircle(0, 0, radius * sizeRate);
    alpha = 1 - randomRate;
  }
  private function follow(eventObject:BallEvent):void {
    var randomRate:Number = Math.random();
    angle += eventObject.speed;
    angle%=Math.PI*2;
    var nX:Number=eventObject.targetX+radius*Math.cos(angle);
    var nY:Number=eventObject.targetY+radius*Math.sin(angle);
    x += (nX - x) * deceleration * randomRate;
    y += (nY - y) * deceleration * randomRate;
  }
}
class BallEvent extends Event {
  public static const FOLLOW:String="follow";
  // private var _targetX:Number;
  public var targetX:Number;
  // private var _targetY:Number;
  public var targetY:Number;
  // private var _speed:Number;
  public var speed:Number;
  public function BallEvent(event_str:String, myTargetX:Number, myTargetY:Number, mySpeed:Number) {
    super(event_str);
    // _targetX = myTargetX;
    targetX=myTargetX;
    // _targetY = myTargetY;
    targetY=myTargetY;
    // _speed = mySpeed;
    speed=mySpeed;
  }
}