AndEngine之DEMO学习（八）EntityModifierIrregularExample

      这个例子真是已经没有什么好说的了，无非是继承于EntityModifier的一个实现而且，他的名字也说的很清楚，不规则的运动改变器。我们记住一些参数就完全能解决问题，比如X向、Y向的拉升，我就直接上代码加注释完事了，很轻松的例子：

package org.andengine.examples;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.IEntity;import org.andengine.entity.modifier.IEntityModifier.IEntityModifierListener;import org.andengine.entity.modifier.ParallelEntityModifier;import org.andengine.entity.modifier.RotationByModifier;import org.andengine.entity.modifier.RotationModifier;import org.andengine.entity.modifier.ScaleModifier;import org.andengine.entity.modifier.SequenceEntityModifier;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.region.TiledTextureRegion;import org.andengine.ui.activity.SimpleBaseGameActivity;import org.andengine.util.modifier.IModifier;import android.widget.Toast;public class EntityModifierIrregularExample extends SimpleBaseGameActivity {private static final int CAMERA_WIDTH = 720;private static final int CAMERA_HEIGHT = 480;private BitmapTextureAtlas mBitmapTextureAtlas;private TiledTextureRegion mFaceTextureRegion;@Overridepublic EngineOptions onCreateEngineOptions() {Toast.makeText(this, "Shapes can have variable rotation and scale centers.", Toast.LENGTH_LONG).show();final Camera camera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);return new EngineOptions(true, ScreenOrientation.LANDSCAPE_FIXED, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), camera);}@Overridepublic void onCreateResources() {BitmapTextureAtlasTextureRegionFactory.setAssetBasePath("gfx/");this.mBitmapTextureAtlas = new BitmapTextureAtlas(this.getTextureManager(), 64, 32, TextureOptions.BILINEAR);this.mFaceTextureRegion = BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(this.mBitmapTextureAtlas, this, "face_box_tiled.png", 0, 0, 2, 1);this.mBitmapTextureAtlas.load();}@Overridepublic Scene onCreateScene() {this.mEngine.registerUpdateHandler(new FPSLogger());final Scene scene = new Scene();scene.setBackground(new Background(0.09804f, 0.6274f, 0.8784f));final float centerX = (CAMERA_WIDTH - this.mFaceTextureRegion.getWidth()) / 2;final float centerY = (CAMERA_HEIGHT - this.mFaceTextureRegion.getHeight()) / 2;//创建动画精灵final AnimatedSprite face1 = new AnimatedSprite(centerX - 100, centerY, this.mFaceTextureRegion, this.getVertexBufferObjectManager());//设置旋转中心face1.setRotationCenter(0, 0);//设置缩放中心face1.setScaleCenter(0, 0);//播放速度（毫秒）face1.animate(100);//第二个动画精灵final AnimatedSprite face2 = new AnimatedSprite(centerX + 100, centerY, this.mFaceTextureRegion, this.getVertexBufferObjectManager());face2.animate(100);//顺序的容器final SequenceEntityModifier entityModifier = new SequenceEntityModifier(new IEntityModifierListener() {@Overridepublic void onModifierStarted(final IModifier<IEntity> pModifier, final IEntity pItem) {EntityModifierIrregularExample.this.runOnUiThread(new Runnable() {@Overridepublic void run() {Toast.makeText(EntityModifierIrregularExample.this, "Sequence started.", Toast.LENGTH_LONG).show();}});}@Overridepublic void onModifierFinished(final IModifier<IEntity> pEntityModifier, final IEntity pEntity) {EntityModifierIrregularExample.this.runOnUiThread(new Runnable() {@Overridepublic void run() {Toast.makeText(EntityModifierIrregularExample.this, "Sequence finished.", Toast.LENGTH_LONG).show();}});}},//持续2秒，X方向又1.0f至0.75f，Y方向又1.0f至2.0fnew ScaleModifier(2, 1.0f, 0.75f, 1.0f, 2.0f),//持续2秒，X方向又0.75f至2.0f，Y方向又2.0f至1.25fnew ScaleModifier(2, 0.75f, 2.0f, 2.0f, 1.25f),//并行的容器new ParallelEntityModifier(new ScaleModifier(3, 2.0f, 5.0f, 1.25f, 5.0f),//以旋转中心旋转180度new RotationByModifier(3, 180)),new ParallelEntityModifier(new ScaleModifier(3, 5, 1),//从180度旋转到0度new RotationModifier(3, 180, 0)));face1.registerEntityModifier(entityModifier);face2.registerEntityModifier(entityModifier.deepCopy());scene.attachChild(face1);scene.attachChild(face2);/* Create some not-modified sprites, that act as fixed references to the modified ones. */final AnimatedSprite face1Reference = new AnimatedSprite(centerX - 100, centerY, this.mFaceTextureRegion, this.getVertexBufferObjectManager());final AnimatedSprite face2Reference = new AnimatedSprite(centerX + 100, centerY, this.mFaceTextureRegion, this.getVertexBufferObjectManager());scene.attachChild(face1Reference);scene.attachChild(face2Reference);return scene;}}

      唯一需要注意的是设置的旋转中心和缩放中心，对EntityModifier会产生影响。