(13)、andengine之多个动画精灵（使用了BuildableBitmapTextureAtlas）

import org.andengine.engine.camera.Camera;
import org.andengine.engine.options.EngineOptions;
import org.andengine.engine.options.ScreenOrientation;
import org.andengine.engine.options.resolutionpolicy.RatioResolutionPolicy;
import org.andengine.entity.scene.Scene;
import org.andengine.entity.scene.background.Background;
import org.andengine.entity.sprite.AnimatedSprite;
import org.andengine.entity.util.FPSLogger;
import org.andengine.opengl.texture.TextureOptions;
import org.andengine.opengl.texture.atlas.bitmap.BitmapTextureAtlas;
import org.andengine.opengl.texture.atlas.bitmap.BitmapTextureAtlasTextureRegionFactory;
import org.andengine.opengl.texture.atlas.bitmap.BuildableBitmapTextureAtlas;
import org.andengine.opengl.texture.atlas.bitmap.source.IBitmapTextureAtlasSource;
import org.andengine.opengl.texture.atlas.buildable.builder.BlackPawnTextureAtlasBuilder;
import org.andengine.opengl.texture.atlas.buildable.builder.ITextureAtlasBuilder.TextureAtlasBuilderException;
import org.andengine.opengl.texture.region.TiledTextureRegion;
import org.andengine.ui.activity.SimpleBaseGameActivity;

import android.util.DisplayMetrics;
/**
 * 多个动画精灵
 */
public class AnimateSpriteActivity extends SimpleBaseGameActivity
{
 private static int winWidth = 854;
 private static int winHeight = 480;
 
 //图片纹理区域(自动定义位置)
 private BuildableBitmapTextureAtlas mBuildableBitmapTextureAtlas;
 private TiledTextureRegion mBananaTiledTextureRegion,mFaceBoxTiledTextureRegion,
   mHelicopterTiledTextureRegion,mSnapdragonTiledTextureRegion;

 @Override
 public EngineOptions onCreateEngineOptions()
 {
  setScreenDisplay();
  Camera camera = new Camera(0, 0, winWidth, winHeight);
  return new EngineOptions(true, ScreenOrientation.LANDSCAPE_FIXED, new RatioResolutionPolicy(winWidth, winHeight), camera);
 }

 @Override
 protected void onCreateResources()
 {
  BitmapTextureAtlasTextureRegionFactory.setAssetBasePath("images/");
  /*
   * BuildableBitmapTextureAtlas对象是一个很好的方式来实现ITextureRegion对象在我们的纹理地图中，无需手动定义位置。
   * 而BitmapTextureAtlas是手动定义TextureRegion在BitmapTextureAtlas中的位置。
   * BuildableBitmapTextureAtlas纹理地图的目的是自动将其ITextureRegion对象放到纹理地图中最合适的坐标。
   * 用这种方法创建纹理是最简单，最有效的方法，因为使用很多纹理地图开发大型游戏时，会非常耗时和容易出错。
   * 除了BuildableBitmapTextureAtlas的自动化功能，开发人员可以在纹理地图中定义透明边距，以避免纹理出血的发生。
   */
  mBuildableBitmapTextureAtlas = new BuildableBitmapTextureAtlas(this.getTextureManager(), 1024, 1024, TextureOptions.DEFAULT);
  mBananaTiledTextureRegion = BitmapTextureAtlasTextureRegionFactory
    .createTiledFromAsset(mBuildableBitmapTextureAtlas, this, "banana_tiled.png", 4, 2);
  mFaceBoxTiledTextureRegion = BitmapTextureAtlasTextureRegionFactory
    .createTiledFromAsset(mBuildableBitmapTextureAtlas, this, "face_box_tiled.png", 2, 1);
  mHelicopterTiledTextureRegion = BitmapTextureAtlasTextureRegionFactory
    .createTiledFromAsset(mBuildableBitmapTextureAtlas, this, "helicopter_tiled.png", 2, 2);
  mSnapdragonTiledTextureRegion = BitmapTextureAtlasTextureRegionFactory
    .createTiledFromAsset(mBuildableBitmapTextureAtlas, this, "snapdragon_tiled.png", 4, 3);

  try
  {
   //BlackPawnTextureAtlasBuilder作用是AndEngine自动组合N个贴图纹理到一张大的纹理里面。其几个参数是子纹理间的距离等
   //在几乎所有的情况下，我们将避免纹理出血的可能性。但是在极端的情况下如果纹理出血，请加大第三个参数的值，这将有助于缓解问题
   mBuildableBitmapTextureAtlas.build(new BlackPawnTextureAtlasBuilder<IBitmapTextureAtlasSource, BitmapTextureAtlas>(0, 1, 1));
  } catch (TextureAtlasBuilderException e)
  {
   e.printStackTrace();
  }
  //一旦地图集已经建成，我们现在可以加载
  mBuildableBitmapTextureAtlas.load();
 }

 @Override
 protected Scene onCreateScene()
 {
  this.mEngine.registerUpdateHandler(new FPSLogger());
  Scene scene = new Scene();
  scene.setBackground(new Background(0.09804f, 0.6274f, 0.8784f));
  
  AnimatedSprite mBananaSprite = new AnimatedSprite(100, 50, mBananaTiledTextureRegion, this.getVertexBufferObjectManager());
  AnimatedSprite mFaceBoxSprite = new AnimatedSprite(400, 30, mFaceBoxTiledTextureRegion, this.getVertexBufferObjectManager());
  AnimatedSprite mHelicopterSprite = new AnimatedSprite(100, 250, mHelicopterTiledTextureRegion, this.getVertexBufferObjectManager());
  AnimatedSprite mSnapdragonSprite = new AnimatedSprite(400, 250, mSnapdragonTiledTextureRegion, this.getVertexBufferObjectManager());
 
  mBananaSprite.animate(100);
  mFaceBoxSprite.animate(100);
  mHelicopterSprite.animate(new long[]{100,100},1,2,true);
  mSnapdragonSprite.animate(100);
  
  scene.attachChild(mBananaSprite);
  scene.attachChild(mFaceBoxSprite);
  scene.attachChild(mHelicopterSprite);
  scene.attachChild(mSnapdragonSprite);
  
  return scene;
 }

 

 /**
  * 设置屏幕大小
  */
 private void setScreenDisplay()
 {
  DisplayMetrics displayMetrics = new DisplayMetrics();
  getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
  winWidth = displayMetrics.widthPixels;
  winHeight = displayMetrics.heightPixels;
 }
 
}