[AndEngine学习教程] 第3节 使用Modifier修改动画

1.AndEngine的动画修改器(modifier)有很多种,常用的有一下几种:

    1.AlphaModifier:透明度修改器,有以下几种构造:

              

public AlphaModifier(final float pDuration, final float pFromAlpha, final float pToAlpha) {this(pDuration, pFromAlpha, pToAlpha, null, EaseLinear.getInstance());}public AlphaModifier(final float pDuration, final float pFromAlpha, final float pToAlpha, final IEaseFunction pEaseFunction) {this(pDuration, pFromAlpha, pToAlpha, null, pEaseFunction);}public AlphaModifier(final float pDuration, final float pFromAlpha, final float pToAlpha, final IEntityModifierListener pEntityModifierListener) {super(pDuration, pFromAlpha, pToAlpha, pEntityModifierListener, EaseLinear.getInstance());}public AlphaModifier(final float pDuration, final float pFromAlpha, final float pToAlpha, final IEntityModifierListener pEntityModifierListener, final IEaseFunction pEaseFunction) {super(pDuration, pFromAlpha, pToAlpha, pEntityModifierListener, pEaseFunction);}protected AlphaModifier(final AlphaModifier pAlphaModifier) {super(pAlphaModifier);}

pDuration代表动画修改周期,就是就是完成整个透明度变化所要的时间,单位为秒.
pFromAlpha代表起始透明度
pToAlpha代表目标透明度

2.ScaleModifier,比例修改器.主要是对动画的大小比例进行修改:

public ScaleModifier(final float pDuration, final float pFromScale, final float pToScale) {this(pDuration, pFromScale, pToScale, null, EaseLinear.getInstance());}public ScaleModifier(final float pDuration, final float pFromScale, final float pToScale, final IEaseFunction pEaseFunction) {this(pDuration, pFromScale, pToScale, null, pEaseFunction);}public ScaleModifier(final float pDuration, final float pFromScale, final float pToScale, final IEntityModifierListener pEntityModifierListener) {this(pDuration, pFromScale, pToScale, pFromScale, pToScale, pEntityModifierListener, EaseLinear.getInstance());}public ScaleModifier(final float pDuration, final float pFromScale, final float pToScale, final IEntityModifierListener pEntityModifierListener, final IEaseFunction pEaseFunction) {this(pDuration, pFromScale, pToScale, pFromScale, pToScale, pEntityModifierListener, pEaseFunction);}public ScaleModifier(final float pDuration, final float pFromScaleX, final float pToScaleX, final float pFromScaleY, final float pToScaleY) {this(pDuration, pFromScaleX, pToScaleX, pFromScaleY, pToScaleY, null, EaseLinear.getInstance());}public ScaleModifier(final float pDuration, final float pFromScaleX, final float pToScaleX, final float pFromScaleY, final float pToScaleY, final IEaseFunction pEaseFunction) {this(pDuration, pFromScaleX, pToScaleX, pFromScaleY, pToScaleY, null, pEaseFunction);}public ScaleModifier(final float pDuration, final float pFromScaleX, final float pToScaleX, final float pFromScaleY, final float pToScaleY, final IEntityModifierListener pEntityModifierListener) {super(pDuration, pFromScaleX, pToScaleX, pFromScaleY, pToScaleY, pEntityModifierListener, EaseLinear.getInstance());}public ScaleModifier(final float pDuration, final float pFromScaleX, final float pToScaleX, final float pFromScaleY, final float pToScaleY, final IEntityModifierListener pEntityModifierListener, final IEaseFunction pEaseFunction) {super(pDuration, pFromScaleX, pToScaleX, pFromScaleY, pToScaleY, pEntityModifierListener, pEaseFunction);}protected ScaleModifier(final ScaleModifier pScaleModifier) {super(pScaleModifier);}

pDuration代表动画修改周期,就是就是完成整个变化所要的时间,单位为秒.
pFromScale代表起始透大小比例
pToScale代表目标大小比例

此外,还有DelayModifier,ColorModifier,MoveModifier等等.
另外还有一些组合式的修改器,如SequenceEntityModifier和ParallelEntityModifier.这类修改器的一个显著特点就是可以同时
对几个样式进行修改而达到想要的效果

2.创建项目
由于我的手机是htc-g12.分辨率为800*480,其他手机的分辨率也可以选择更加合适的分辨率,只要尺寸比例一致就可以了.因为我使用到RatioResolutionPolicy
进行屏幕的绘制.它可以自动缩放到屏幕合适的大小.

private static final String TAG = "Season";private static final int CAMERA_WIDTH = 800;private static final int CAMERA_HEIGHT = 480;private Camera mCamera;private Scene mScene;private RepeatingSpriteBackground background;private TiledTextureRegion mFaceTextureRegion;

在onCreateEngineOptions()处设置camera和EngineOption选项

@Overridepublic EngineOptions onCreateEngineOptions() {// TODO Auto-generated method stubmCamera = new Camera(0,0,CAMERA_WIDTH,CAMERA_HEIGHT);EngineOptions mEngineOptions = new EngineOptions(true, ScreenOrientation.LANDSCAPE_SENSOR, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), mCamera);return mEngineOptions;}

需要说明的几个参数是有关EngineOptions的:
   回到EngineOptions的源代码构造函数为:

public EngineOptions(final boolean pFullscreen, final ScreenOrientation pScreenOrientation, final IResolutionPolicy pResolutionPolicy, final Camera pCamera) {this.mFullscreen = pFullscreen;this.mScreenOrientation = pScreenOrientation;this.mResolutionPolicy = pResolutionPolicy;this.mCamera = pCamera;}

一目了然:
如果要全屏显示,pFullscreen就应该为true.
pScreenOrientation是一个枚举类型的数据

public enum ScreenOrientation {// ===========================================================// Elements// ===========================================================/** The app will be fixed in its default Landscape mode. */LANDSCAPE_FIXED,/** The app will automatically rotate between the Landscape modes, depending on the orientation of the device. */LANDSCAPE_SENSOR,/** The app will be fixed in its default Portrait mode. */PORTRAIT_FIXED,/** The app will automatically rotate between the Portrait modes, depending on the orientation of the device. */PORTRAIT_SENSOR; }

pResolutionPolicy是屏幕的绘制策略,常用的有这几种:FillResolutionPolicy,FixedResolutionPolicy,RatioResolutionPolicy,RelativeResolutionPolicy,从名字
就可以看出各种策略的大致用途了.
在onCreateResources处,是游戏引擎在创建资源(图片,声音等)进行加载用.

public void onCreateResources(OnCreateResourcesCallback pOnCreateResourcesCallback)throws Exception {// TODO Auto-generated method stubthis.background = new RepeatingSpriteBackground(CAMERA_WIDTH, CAMERA_HEIGHT,                 getTextureManager(), AssetBitmapTextureAtlasSource.create(      this.getAssets(), "background.png"),      getVertexBufferObjectManager()); BitmapTextureAtlas mTexture = new BitmapTextureAtlas(getTextureManager(),64,32,TextureOptions.BILINEAR_PREMULTIPLYALPHA);mFaceTextureRegion = BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(mTexture, this, "face_box_tiled.png", 0, 0,2,1);/** * 参数说明: * mTexure是在内存中放置贴图资源用的,64,32是图片要求的宽和高,必须是2的n次方大小.如:2,4,8,16,32,64,128,512,1024.... * 并且要比原图的宽高要大 *  * mFaceTextureRegion相当于从mTexure中扣图,因为mTexure是由很多图集组成的,要从中截取一片出来 * 0,0代表截图的top,right坐标(起点坐标),2和1分别代表贴图中一张存在2列1行 *  */mTexture.load();pOnCreateResourcesCallback.onCreateResourcesFinished();}

onCreateScene是整个游戏的精华之处,所有游戏的控制部分都在这里实现
首先创建场景,布置好背景

 mScene = new Scene();mScene.setBackground(background);

接着定位屏幕中心位置,用来放置精灵动画:

     final float centerX = (CAMERA_WIDTH - mFaceTextureRegion.getWidth()) / 2;//计算贴图的中心坐标     final float centerY = (CAMERA_HEIGHT - mFaceTextureRegion.getHeight()) / 2;

在本例程中,主要创建一个红色的外形和一个贴图动画:

      

final Rectangle rect = new Rectangle(centerX+100,centerY,32,32,getVertexBufferObjectManager());rect.setColor(1, 0, 0);final AnimatedSprite face = new AnimatedSprite(centerX - 100, centerY, mFaceTextureRegion, getVertexBufferObjectManager());face.setBlendFunction(GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA);    创建完精灵后,就给精灵添加修改器了,这个地方是比较灵活的,完全根据自己的需要来制作.              final LoopEntityModifier shapeModifier = new LoopEntityModifier(new IEntityModifierListener(){@Overridepublic void onModifierStarted(IModifier<IEntity> pModifier,IEntity pItem) {// TODO Auto-generated method stubLog.d(TAG,"LoopEntityModifier started!");}@Overridepublic void onModifierFinished(IModifier<IEntity> pModifier, IEntity pItem) {// TODO Auto-generated method stubLog.d(TAG,"LoopEntityModifier finished!");}},-1, //无限循环new ILoopEntityModifierListener(){@Overridepublic void onLoopStarted(LoopModifier<IEntity> pLoopModifier, int pLoop,int pLoopCount) {// TODO Auto-generated method stubLog.d(TAG,"ILoopEntityModifierListener started!");}@Overridepublic void onLoopFinished(LoopModifier<IEntity> pLoopModifier, int pLoop,int pLoopCount) {//Toast.makeText(ShapeModifiers.this, "Loops remaining: " + pLoop, Toast.LENGTH_SHORT).show();// TODO Auto-generated method stubLog.d(TAG,"ILoopEntityModifierListener finished!");}},                new SequenceEntityModifier(new RotationModifier(1, 0, 90),new AlphaModifier(5, 1, 0),new AlphaModifier(1, 0, 1),new ScaleModifier(2, 1, 0.5f),new DelayModifier(0.5f),new ParallelEntityModifier(new ScaleModifier(3, 0.5f, 5),new RotationByModifier(3, 90)),new ParallelEntityModifier(new ScaleModifier(3, 5, 1),new RotationModifier(3, 180, 0)){}));

LoopEntityModifier是一个循环修改器,第三个参数就是循环的次数,-1代表无限重复,从源代码中可以看出各个参数的作用

 public class LoopEntityModifier extends LoopModifier<IEntity> implements IEntityModifier {// ===========================================================// Constants// ===========================================================// ===========================================================// Fields// ===========================================================// ===========================================================// Constructors// ===========================================================public LoopEntityModifier(final IEntityModifier pEntityModifier) {super(pEntityModifier);}public LoopEntityModifier(final IEntityModifier pEntityModifier, final int pLoopCount) {super(pEntityModifier, pLoopCount);}public LoopEntityModifier(final IEntityModifier pEntityModifier, final int pLoopCount, final ILoopEntityModifierListener pLoopModifierListener) {super(pEntityModifier, pLoopCount, pLoopModifierListener);}public LoopEntityModifier(final IEntityModifier pEntityModifier, final int pLoopCount, final IEntityModifierListener pEntityModifierListener) {super(pEntityModifier, pLoopCount, pEntityModifierListener);}public LoopEntityModifier(final IEntityModifierListener pEntityModifierListener, final int pLoopCount, final ILoopEntityModifierListener pLoopModifierListener, final IEntityModifier pEntityModifier) {super(pEntityModifier, pLoopCount, pLoopModifierListener, pEntityModifierListener);}protected LoopEntityModifier(final LoopEntityModifier pLoopEntityModifier) throws DeepCopyNotSupportedException {super(pLoopEntityModifier);}@Overridepublic LoopEntityModifier deepCopy() throws DeepCopyNotSupportedException {return new LoopEntityModifier(this);}// ===========================================================// Getter & Setter// ===========================================================// ===========================================================// Methods for/from SuperClass/Interfaces// ===========================================================// ===========================================================// Methods// ===========================================================// ===========================================================// Inner and Anonymous Classes// ===========================================================public interface ILoopEntityModifierListener extends ILoopModifierListener<IEntity> {// ===========================================================// Constants// ===========================================================// ===========================================================// Methods// ===========================================================}}

最后要做的工作就是将修改器绑定到精灵,将精灵放置到场景中

face.registerEntityModifier(shapeModifier);rect.registerEntityModifier(shapeModifier.deepCopy());mScene.attachChild(face);mScene.attachChild(rect);pOnCreateSceneCallback.onCreateSceneFinished(mScene);

3.制作完成的效果如下图所示

效果解释:两个精灵在5秒的时间内慢慢变为透明
在1秒时间内变为完全不透明
尺寸在2秒内变为0.5倍大小
暂停等待0.5秒
在三秒内完成由0.5倍大小到5倍大小渐变,同时旋转90度
在三秒内由5被大小变为一倍大小,同时由180度转回0度

本例子源代码:http://download.csdn.net/detail/cen616899547/4702761