|----Common           //Include EventSystem, Constants, etc
      |----EventSystem
      |----Constants and other common class
|----Render           //Basic implementation of DrawNode, Sprite, Scene, etc
      |----DrawNode   //Simple tree node.
      |----Sprite
      |----Scene
|----Animations
      |----Animation  //Animation base class
      |----EaseFunction   //Key point of animation, you can define your own animation based on different ease function
      |----Sequence   //Play a set of animation in sequence
      |----Parallel   //Play a set of animation in parallel
      |----Frame      //Frame animation
      |----MoveXY     //Move animation
      |----MoveZ
      |----RotateX    //Rotate animation
      |----RotateY
      |----RotateZ
      |----Scale      //Scale animation
      |----Fade       //Fade animation
|----Soul             //This module combine the render system with physics system(BOX2D), it's the soul part of this engine
      |----Unit       //Physics wrapper of Box2D
      |----DrawUnit   //Combine of unit and render module
      |----Character  //The draw unit that has actions and other properties(e.g. HP)
      |----World      //World simulator
      |----[Actions]    //Define serveral basic actions for character
            |----IAciton  //Interface of action
            |----Walk
            |----Jump
            |----TurnRight
            |----TurnLeft
            |----Attack
            |----GotHit
            |----Dying
            |----Stop
|----Cameras          //Different kinds of cameras
      |----BaseCamera     //Simple camera
      |----AnimatedCamera //Camera with animation, e.g. can be used for auto playing video
      |----TargetCamera   //Camera to simply follow a sprite
      |----UnitCamera     //Camera to follow a unit, with certain bound and animation.
|----AI               //Use IronPython to build the ai system.
      |----AI         //Load AI script, assign things to py script and execute certain update function in py.
      |----AIHelper   //Define some helper ai function
      |----[AIScripts]  //Some sample Python ai file
            |-----Null.py   //AI does nothing
|----Managers         //Managers
      |----AIManager
      |----AuditionManager
      |----CameraManager
      |----EffectManager
      |----EventManager
      |----GroupManager
      |----InputManager
      |----LoggerManager
      |----SceneManager
      |----XNADevicesManager
|----SceneTemplates
      |----2DAVGScene
|----Trace
      |----ILogger
      |----BaseLogger
      |----FileLogger
      |----XNALogger
|----Utilities
      |----RandomHelper
      |----XmlHelper
|-----Misc
      |----Logo
      |----Board
      |----HpBar