flex游戏引擎（PushButton）-使用XML层格式存储游戏对象-3

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#游戏 #XML #Flex #ActionScript #Adobe

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本文深入探讨了游戏开发中LevelManager组件如何加载level文件及其内部工作原理，包括MXML和ActionScript两种加载方式，以及如何通过事件响应加载和卸载level文件的过程。此外，介绍了XML文件在LevelManager组件中的应用以及与TemplateManager和Serialization类的关联。通过详细的步骤和代码示例，读者可以全面理解并掌握LevelManager组件在游戏开发中的高效资源管理。

加载level文件

使用LevelManager加载文件，并管理它，提供接口加载和卸载level文件，你可以覆盖一些接口。

通过MXML加载

 
   1.
   <mx:Canvas xmlns:mx="http://www.adobe.com.2006/mxml" xmlns:pb="PBLabs.Engine.MXML.*">  
  
   2.
      <pb:LevelFileReference filename="..Assets/Levels/level.pbelevel" level="0" id="myLevelReference" />  
  
   3.
      <pb:GroupReference name="Managers" level="0" id="managerGroup" />  
  
   4.
      <pb:GroupReference name="SpriteSheets" level="0" id="spriteSheetsGroup" />  
  
   5.
      <pb:GroupReference name="Objects" level="0" id="objectsGroup" />  
  
   6.
      <pb:GroupReference name="Everything" level="0" id="everythingGroup" />  
  
   7.
   </mx:Canvas>  
  
   当LevelManager加载层，4个组获得对象，被LevelFileReference 、GroupReference2个类共享的level属性不过是索引定义加载的文件或层的编号

1.// 加载0层启动GAME

 
   2.
   LevelManager.Instance.LoadLevel(0);  
  
   3.
   LevelManager.Instance.Start();  
  
   当0层加载后，对象创建，游戏启动， LevelManager 分发基于加载和卸载level文件的事件

01.// Add a listener to respond to level loaded event

 
   02.
   LevelManager.Instance.addEventListener(LevelEvent.LEVEL_LOADED_EVENT, levelLoadedHandler, false, 0, true);  
  
   03.
   // Load level 0 and start game.  
  
   04.
   LevelManager.Instance.LoadLevel(0);  
  
   05.
   LevelManager.Instance.Start();  
  
   06.
   private function levelLoadedHandler(event:LevelEvent):void 
  
   07.
   {  
  
   08.
      // level is loaded!  
  
   09.
   }

通过ActionScript加载

与通过MXML相似

01.// Add file and group references

 
   02.
   LevelManager.Instance.AddFileReference(0, "../Assets/Levels/level.pbelevel");  
  
   03.
   LevelManager.Instance.AddGroupReference(0, "Managers");  
  
   04.
   LevelManager.Instance.AddGroupReference(0, "SpriteSheets");  
  
   05.
   LevelManager.Instance.AddGroupReference(0, "Objects");  
  
   06.
   LevelManager.Instance.AddGroupReference(0, "Everything");  
  
   07.
   // Load level 0 and start game.  
  
   08.
   LoadManager.Instance.LoadLevel(0);  
  
   09.
   LoadManager.Instance.Start();

对XML的其他使用

level文件和TemplateManager用来加载和实例XML数据，Serialization类可从XML中实例化，但建议使用TemplateManager

完整TAG列表

things: The root tag.
template: A child of the root tag, specifying that the contained XML is a template definition.
entity: A child of the root tag, specifying that the contained XML is an entity definition.
group: A child of the root tag, specifying that the contained XML is a group definition.
component: A child of the template or entity tag, specifying that the contained XML is a component definition.
objectReference: A child of the group tag, specifying the name of a template or object to instantiate with the group.
groupReference: A child of the group tag, specifying the name of a group to instantiate with the parent group.

完整属性列表

name:
- On template tags, it specifies the name of the template.
- On entity tags, it specifies both the name of the entity in XML, and the name of the object that is instantiated from it.
- On group tags, it specifies the name of the group.
- On component tags, it specifies the name of the component once registered with its owning IEntity.
- On objectReference tags, it specifies the name of the template or entity to reference.
- On groupReference tags, it specifies the name of the group to reference.
template: Exists on a template or entity tag and specifies the name of a template to inherit component definitions from.
nameReference: Specifies the name of an entity to lookup and set on the tag.
objectReference: Specifies the name of a template or entity to instantiate and set on the tag.
entityName: Specifies the name of a template or entity to lookup and search for a compatible component to set on the tag.
w: Specifies the name of a component to reference. If used without a componentReference attribute, the component is looked up on the same entity that this attribute is a part of.
type:
- On a component, specifies the fully qualified type to use to instantiate the component.
- On a field, specifies the type to use when instantiating the field for the parent tag.
childType: Specifies the type to use when instantiating objects to add to an array or dictionary.
filename: For fields that hold resources, this lets you specify a file path. The field must be of a compatible type to the type of the resource as specified to the resource manager. The resource will be loaded and assigned to the field.