(转)[AndEngine学习教程] 第5节 可触摸移动的Sprite

1.本节要点:

       1.之前绘制的动画场景都是单人物的,这节主要讲解如何实现多个AnimatedSprite在共用一个BitmapTextureAtlas下的应用

       2.之前的精灵动画都没有交互性的,这节要实现触摸可以拖动精灵

       3.实现屏幕的多点触摸

2.Texture的创建

      1.本节用到4个精灵贴图:

要合理的利用BitmapTextureAtlas这个类进行封装这四个贴图成一个大的texture,首先了解下它的构造:

 /**
 * Uses {@link BitmapTextureFormat#RGBA_8888}.
  *
 * @param pTextureOptions the (quality) settings of this {@link BitmapTextureAtlas}.
  */
 public BitmapTextureAtlas(final TextureManager pTextureManager, final int pWidth, final int pHeight, final TextureOptions pTextureOptions) throws                IllegalArgumentException {
 this(pTextureManager, pWidth, pHeight, BitmapTextureFormat.RGBA_8888, pTextureOptions, null);
 }

这里的BitmapTextureAtlas是指在内存中贴图集合,可以将多个图片同时放置在这里,本例子就是将四张大贴图放置期中;

另外一个值得注意的东西就是TiledTextureRegion,它可以从BitmapTextureAtlas中"扣"出一张贴图

3.细节处理

    1.内部变量设置

 private static final int CAMERA_WIDTH = 800;
     private static final int CAMERA_HEIGHT = 480;

     private Camera mCamera;
     private RepeatingSpriteBackground mBackground;
     private BitmapTextureAtlas  mTexture;
     private TiledTextureRegion mBanana;
     private TiledTextureRegion mFrog;
     private TiledTextureRegion mHelicopter;
     private TiledTextureRegion mSnapDragon;

  2.四张贴图中的分辨路分别为:132x70,96x32,96x84,400x180

   考虑到BitmapTextureAtlas 的长与宽只能为2的n次方大小,所以要把贴图集设置为512x256大小

 mTexture = new BitmapTextureAtlas(getTextureManager(), 512, 256, TextureOptions.BILINEAR_PREMULTIPLYALPHA);

然后要把四张精灵贴图放置在mTexture里面就需要动下脑筋了,为了更加合理的放置,我把4张图片放置在photoshop里,然后创建一张

512x256大小的图片,尝试拖动他们进去排布,最终比较合理的排布为:

程序上实现的方法为:

               mSnapDragon = BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(mTexture, this, "snapdragon_tiled.png", 0, 0, 4, 3);
 mHelicopter = BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(mTexture, this, "helicopter_tiled.png", 400, 0, 2, 2);
 mBanana = BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(mTexture, this, "banana_tiled.png", 0, 180, 4, 2);
 mFrog = BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(mTexture, this, "frog.png", 132, 180, 3, 1);



 mTexture.load();

3.创建可以支持触摸拖动的AnimatedSprite精灵

  自己根据需要创建TouchAnimatedSprite,并且集成AnimatedSprite的所有方法

 public class TouchAnimatedSprite extends AnimatedSprite{

         public TouchAnimatedSprite(float pX, float pY, float pWidth,
                 float pHeight, ITiledTextureRegion pTiledTextureRegion,
                 VertexBufferObjectManager pVertexBufferObjectManager) {
             super(pX, pY, pWidth, pHeight, pTiledTextureRegion, pVertexBufferObjectManager);
             // TODO Auto-generated constructor stub
         }
         @Override
         public boolean onAreaTouched(TouchEvent pSceneTouchEvent,
                 float pTouchAreaLocalX, float pTouchAreaLocalY) {
             // TODO Auto-generated method stub
             switch(pSceneTouchEvent.getAction()){
             case TouchEvent.ACTION_DOWN:
             case TouchEvent.ACTION_MOVE:
                  this.setPosition(pSceneTouchEvent.getX()-this.getWidth()/2, pSceneTouchEvent.getY()-this.getHeight()/2);
                  return true;


             }
             return super.onAreaTouched(pSceneTouchEvent, pTouchAreaLocalX, pTouchAreaLocalY);
         }


     }

 有了TouchAnimatedSprite这个类,就可以书写相关的初始化工作了,在onCreateScene(OnCreateSceneCallback pOnCreateSceneCallback)方法

中添加场景等初始化资源

  

 Scene mScene = new Scene();
 ground(mBackground);

接着在Scene中创建4个动画精灵

  

 final TouchAnimatedSprite myBanana = new TouchAnimatedSprite(100, 50,64,64,mBanana, getVertexBufferObjectManager());
         myBanana.animate(150);

         final TouchAnimatedSprite myFrog = new TouchAnimatedSprite(100,CAMERA_HEIGHT-100,64,64,mFrog,getVertexBufferObjectManager());
         myFrog.animate(90);

         final TouchAnimatedSprite myHelicopter = new TouchAnimatedSprite(CAMERA_WIDTH - 140, CAMERA_HEIGHT - 100, 84,84,mHelicopter,getVertexBufferObjectManager());
         myHelicopter.animate(new long[]{100,200,150,400},0,3,true);

         final TouchAnimatedSprite mySnapDragon = new TouchAnimatedSprite(CAMERA_WIDTH - 100,50,85,85,mSnapDragon,getVertexBufferObjectManager());
         mySnapDragon.animate(90);

然后把四个精灵动画添加到场景中

               mScene.attachChild(myBanana);
 mScene.attachChild(myFrog);
 mScene.attachChild(myHelicopter);
 mScene.attachChild(mySnapDragon);

场景中的人物布置好了之后,接着个场景中的人如添加触摸操作支持

               mScene.registerTouchArea(myBanana);
 mScene.registerTouchArea(myFrog);
 mScene.registerTouchArea(myHelicopter);
 mScene.registerTouchArea(mySnapDragon);
 mScene.setTouchAreaBindingOnActionDownEnabled(true);

至此,整个设计已经完成了,但是屏幕只可以支持单点触摸的方式,毕竟咱们的手机大多数都是

支持多点触摸的,这样岂不是浪费并且不好玩.为了支持多点触摸可以在onCreateScene(OnCreateSceneCallback pOnCreateSceneCallback)方法

初始化mScene后添加如下方法:

    if(MultiTouch.isSupported(this))//添加多点触摸支持
 {
  this.mEngine.setTouchController(new MultiTouchController());
  this.mEngine.getEngineOptions().getTouchOptions().setNeedsMultiTouch(true);
 }

这样做了之后是不是很完美了呢?哈哈哈~~~~~~~~~~~~~~~~~~~~~

好了,废话少说,看看效果再说吧!

本节源代码下载地址:http://download.csdn.net/detail/cen616899547/4707665

转自：http://blog.csdn.net/cen616899547/article/details/8133266