AndEngine学习 ： AnimatedSpritesExample（动画）

// 代码一目了然，注释写的很清楚，我就不多说废话了
// 图片:

banana_tiled.png

face_box_tiled.png

helicopter_tiled.png

snapdragon_tiled.png

// 以上是需要的图片，都放到工程目录下的assets/gfx目录下

public class AnimatedSpritesActivity extends BaseGameActivity
{
    // Constants
    private static final int CAMERA_WIDTH = 480;
    private static final int CAMERA_HEIGHT = 320;
    
    // Fields
    private Camera mCamera;

    // 我们要把上边提到的几张图片加载到mBitmapTextureAtlas上
    // 然后mSnapdragonTextureRegion，mHelicopterTextureRegion，mBananaTextureRegion和mFaceTextureRegion
    // 各自从mBitmapTextureAtlas上截取自己需要的
    private BitmapTextureAtlas mBitmapTextureAtlas;

    private TiledTextureRegion mSnapdragonTextureRegion;
    private TiledTextureRegion mHelicopterTextureRegion;
    private TiledTextureRegion mBananaTextureRegion;
    private TiledTextureRegion mFaceTextureRegion;
    
    public Engine onLoadEngine() 
    {
        this.mCamera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);
        return new Engine(new EngineOptions(true, 
                    ScreenOrientation.LANDSCAPE, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT),
                this.mCamera));
    }

    public void onLoadResources() 
    {
        // 想象一下mBitmapTextureAtlas是一张大画布，我们在上边画画，画了四张图片，每张是一个TextureRegion
        // 由于三个图片的大小为：
        // snapdragon_tiled.png : 400 X 180
        // bana_tiled.png : 132 X 70
        // face_box_tiled.png : 64 X 32
        // helicopter_tiled.png : 96 X 84
        // 故总共为 (400 + 132 + 64 + 96) X (180，70, 32, 84中的较大者) = 692 X 180
        // 因为长和宽必须为2的幂次，所以我们取1024 X 256
        
        this.mBitmapTextureAtlas = new BitmapTextureAtlas(1024, 256, TextureOptions.BILINEAR);
        
        // 设置png的起始路径，我们把所有的图片都放到了assets/gfx下边
        BitmapTextureAtlasTextureRegionFactory.setAssetBasePath("gfx/");
        
        // 分别取四个动画的区域
        // 解释一下创建mSnapdragonTextureRegion时的参数0，0，4，3，
        // 其中的0，0代表该区域在mBitmapTextureAtlas中的起始位置
        // 我们需要设置该位置，使四个TextureRegion不重叠
        // 同样，想象一下mBitmapTextureAtlas是一张大画布，我们在上边画画，画了四张图片，每张是一个TextureRegion
        // 下边解释4，3
        // 4代表列数，3代表行数
        // 观察一下图片就可以看见，snapdragon_tiled.png这幅图片是分了3行4列的
        this.mSnapdragonTextureRegion = 
                BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(
                        this.mBitmapTextureAtlas, 
                        this, 
                        "snapdragon_tiled.png",
                        0, 0, 4, 3); 
        
        this.mHelicopterTextureRegion = 
                BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(
                        this.mBitmapTextureAtlas, 
                        this, 
                        "helicopter_tiled.png",
                        400, 0, 2, 2);
        this.mBananaTextureRegion = 
                BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(
                        this.mBitmapTextureAtlas,
                        this,
                        "banana_tiled.png",
                        496, 0, 4, 2);
        this.mFaceTextureRegion = 
                BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(
                        this.mBitmapTextureAtlas,
                        this, 
                        "face_box_tiled.png",
                        628, 0, 2, 1);
        
        this.mEngine.getTextureManager().loadTexture(this.mBitmapTextureAtlas);
    }

    public Scene onLoadScene() 
    {
        final Scene scene = new Scene();
        scene.setBackground(new ColorBackground(0.09804f, 0.6274f, 0.8784f));
        
        /* Quickly twinkling face. */
        final AnimatedSprite face = new AnimatedSprite(100, 50, this.mFaceTextureRegion);
        face.animate(100);
        scene.attachChild(face);

        /* Continuously flying helicopter. */
        final AnimatedSprite helicopter = new AnimatedSprite(320, 50, this.mHelicopterTextureRegion);
        helicopter.animate(new long[] { 100, 100 }, 1, 2, true);
        scene.attachChild(helicopter);

        /* Snapdragon. */
        final AnimatedSprite snapdragon = new AnimatedSprite(300, 200, this.mSnapdragonTextureRegion);
        snapdragon.animate(100);
        scene.attachChild(snapdragon);

        /* Funny banana. */
        final AnimatedSprite banana = new AnimatedSprite(100, 220, this.mBananaTextureRegion);
        banana.animate(100);
        scene.attachChild(banana);

        return scene;
    }

    public void onLoadComplete() 
    {
        
    }
    
}