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[AndEngine学习教程] 第9节 CollisionDetection 实体碰撞检测

来源：互联网 发布：江苏网络问政 编辑：程序博客网 时间：2024/05/21 17:07

转自：http://blog.csdn.net/cen616899547/article/details/8151822

1.本节要点

通过一个可操作的精灵,来与一个固定循环变化的矩形检测是否产生碰撞,当产生碰撞的时候,矩形的颜色为红色,

否则矩形的颜色为绿色

2.新学内容

1.学会使用SmoothCamera类,这个类是一个平滑的照相机类,可以满足背景自动填充,平滑过渡的效果.先看看它的构成吧:

[java] view plaincopyprint?
  1. public class SmoothCameraextends ZoomCamera
是继承于SmoothCamera的类,而SmoothCamera从文字上就可以看出它是一个支持缩放效果的类,因此使用起来就很方便了,

构造方法为:

[java] view plaincopyprint?
  1. public SmoothCamera(finalfloat pX,finalfloat pY,finalfloat pWidth,finalfloat pHeight,finalfloat pMaxVelocityX,finalfloat pMaxVelocityY,finalfloat pMaxZoomFactorChange) {
  2. super(pX, pY, pWidth, pHeight);
  3. this.mMaxVelocityX = pMaxVelocityX;
  4. this.mMaxVelocityY = pMaxVelocityY;
  5. this.mMaxZoomFactorChange = pMaxZoomFactorChange;
  7. this.mTargetCenterX =this.getCenterX();
  8. this.mTargetCenterY = this.getCenterY();
  10. this.mTargetZoomFactor = 1.0f;
  11. }

为了体现效果,我刻意的把背景图片做成720*640大小,而手机的屏幕分辨率大小为800*480,但是依然可以看到全屏的效果.相当不错的哦!

以下的是我使用到的背景图片:

2.为场景Scene注册刷新句柄,用来监听每次实体间是否产生碰撞.然后进行相应的事物处理,具体调用方法为:

[java] view plaincopyprint?
  1. mScene.registerUpdateHandler(new IUpdateHandler());

3.内部代码初始化设计

1.本节使用到4个实体,一个是人脸,另外一个是矩形,最后2个是控制器,内部成员变量设计为:

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  1. private staticfinalint CAMERA_WIDTH =800;
  2. private staticfinalint CAMERA_HEIGHT =480;
  4. private SmoothCamera mCamera;
  5. private SpriteBackground mBackground;
  6. private TiledTextureRegion mControlBaseRegion;
  7. private TiledTextureRegion mControlKnobRegion;
  8. private TiledTextureRegion mFaceRegion;


2.引擎资源的加载

[java] view plaincopyprint?
  1. @Override
  2. public EngineOptions onCreateEngineOptions() {
  3. // TODO Auto-generated method stub
  4. mCamera = new SmoothCamera(0,0, CAMERA_WIDTH, CAMERA_HEIGHT,10,10,3);
  5. EngineOptions mEngineOptions = new EngineOptions(true, ScreenOrientation.LANDSCAPE_SENSOR,new RatioResolutionPolicy(CAMERA_WIDTH,CAMERA_HEIGHT),mCamera);
  6. return mEngineOptions;
  7. }
  9. @Override
  10. public void onCreateResources(
  11. OnCreateResourcesCallback pOnCreateResourcesCallback)
  12. throws Exception {
  13. // TODO Auto-generated method stub
  14. BitmapTextureAtlas mTexture = new BitmapTextureAtlas(getTextureManager(),1024,1024, TextureOptions.BILINEAR_PREMULTIPLYALPHA);
  15. final TiledTextureRegion mBackgroundRegion = BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(mTexture,this,"bg.png",0,0,1,1);
  16. final Sprite mBackgroundSprite =new Sprite(0,0, CAMERA_WIDTH, CAMERA_HEIGHT, mBackgroundRegion, getVertexBufferObjectManager());
  17. mBackground = new SpriteBackground(mBackgroundSprite);
  19. mControlBaseRegion = BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(mTexture,this,"onscreen_control_base.png",720,0,1,1);
  20. mControlKnobRegion = BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(mTexture,this,"onscreen_control_knob.png",848,0,1,1);
  21. mFaceRegion = BitmapTextureAtlasTextureRegionFactory.createTiledFromAsset(mTexture,this,"face_box.png",912,0,1,1);
  23. mTexture.load();
  24. pOnCreateResourcesCallback.onCreateResourcesFinished();
  25. }

4.场景设计
1.添加多点触摸支持和场景基础设施

[java] view plaincopyprint?
  1. if(MultiTouch.isSupported(this)){
  2. this.mEngine.setTouchController(new MultiTouchController());//多点触摸
  3. }
  5. Scene mScene = new Scene();
  6. mScene.setBackground(mBackground);
  8. final float centerX = (CAMERA_WIDTH - mFaceRegion.getWidth()) /2;
  9. final float centerY = (CAMERA_HEIGHT - mFaceRegion.getHeight()) /2;

2.构建相应的精灵任务:

2.1 布置人脸:

[java] view plaincopyprint?
  1. final MySprite mFace = new MySprite(centerX - 50, centerY,80,80, mFaceRegion, getVertexBufferObjectManager());
2.2 不知受碰撞检测的矩形

[java] view plaincopyprint?
  1. final Rectangle mRectangle =new Rectangle(centerX +10, centerY,80,80,getVertexBufferObjectManager());
  2. mRectangle.registerEntityModifier(new LoopEntityModifier(new ParallelEntityModifier(
  3. new ScaleModifier(2,0.5f,2.0f),new ScaleModifier(2,2.0f,1.0f),new RotationModifier(4,0.0f,360.0f) )));
添加相应的modifier后,矩形就会动态的变幻了.

2.3 布置移动控制器和方向控制器

[java] view plaincopyprint?
  1. final AnalogOnScreenControl mSpeedController =new AnalogOnScreenControl(30,CAMERA_HEIGHT - mControlBaseRegion.getHeight() -20,
  2. mCamera, mControlBaseRegion, mControlKnobRegion, 0.1f,100,getVertexBufferObjectManager(),
  3. new IAnalogOnScreenControlListener(){
  5. @Override
  6. public void onControlChange(
  7. BaseOnScreenControl pBaseOnScreenControl,
  8. float pValueX, float pValueY) {
  9. // TODO Auto-generated method stub
  10. if(pValueX == 0 && pValueY ==0){
  11. mFace.setVelocity(0,0);
  12. }
  14. else
  15. {
  16. mFace.setVelocity(pValueX*100, pValueY*100);
  17. }
  18. }
  20. @Override
  21. public void onControlClick(
  22. AnalogOnScreenControl pAnalogOnScreenControl) {
  23. // TODO Auto-generated method stub
  25. }
  28. });
  31. final AnalogOnScreenControl mRotationController =new AnalogOnScreenControl(CAMERA_WIDTH - mControlBaseRegion.getWidth() -30,
  32. CAMERA_HEIGHT - mControlBaseRegion.getHeight() - 20,
  33. mCamera, mControlBaseRegion, mControlKnobRegion, 0.1f,100,getVertexBufferObjectManager(),
  34. new IAnalogOnScreenControlListener(){
  36. @Override
  37. public void onControlChange(
  38. BaseOnScreenControl pBaseOnScreenControl,
  39. float pValueX, float pValueY) {
  40. // TODO Auto-generated method stub
  41. if(pValueX == 0 && pValueY == 0){
  42. mFace.setRotation(0.0f);
  43. }
  45. else
  46. {
  47. mFace.setRotation(MathUtils.radToDeg(MathUtils.atan2(pValueY, pValueX)));
  48. }
  49. }
  51. @Override
  52. public void onControlClick(
  53. AnalogOnScreenControl pAnalogOnScreenControl) {
  54. // TODO Auto-generated method stub
  56. }
  59. });
2.4 把所有角色搬到场景中

[java] view plaincopyprint?
  1. mSpeedController.getControlBase().setBlendFunction(GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA);
  2. mRotationController.getControlBase().setBlendFunction(GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA);
  4. mScene.attachChild(mFace);
  5. mScene.attachChild(mRectangle);
  6. mScene.setChildScene(mSpeedController);
  7. mSpeedController.setChildScene(mRotationController);
  9. pOnCreateSceneCallback.onCreateSceneFinished(mScene);

5.在场景中注册刷新监听事件

[java] view plaincopyprint?
  1. mScene.registerUpdateHandler(new IUpdateHandler(){
  3. @Override
  4. public void onUpdate(float pSecondsElapsed) {
  5. // TODO Auto-generated method stub
  6. if(mRectangle.collidesWith(mFace)){
  7. mRectangle.setColor(1.0f,0.0f,0.0f);
  8. }
  10. else
  11. {
  12. mRectangle.setColor(0.0f,1.0f,0.0f);
  13. }
  14. }
  16. @Override
  17. public void reset() {
  18. // TODO Auto-generated method stub
  20. }
  23. });
有了这个监听后,场景每次的刷新都可以添加处理事件了.所以基本上就完成任务了,呵呵


6.辅助自定义类

[java] view plaincopyprint?
  1. public class MySpriteextends Sprite{
  3. public MySprite(float pX,float pY,float pWidth,float pHeight,
  4. ITextureRegion pTextureRegion,
  5. VertexBufferObjectManager pVertexBufferObjectManager) {
  6. super(pX, pY, pWidth, pHeight, pTextureRegion, pVertexBufferObjectManager);
  7. // TODO Auto-generated constructor stub
  8. }
  10. private float mVelocityX =0;
  11. private float mVelocityY =0;
  15. @Override
  16. protected void onManagedUpdate(float pSecondsElapsed) {
  17. // TODO Auto-generated method stub
  18. this.mX += mVelocityX * pSecondsElapsed;
  19. this.mY += mVelocityY * pSecondsElapsed;
  21. this.setPosition(mX, mY);
  23. super.onManagedUpdate(pSecondsElapsed);
  24. }
  26. void setVelocity(float vX,float vY){
  27. mVelocityX = vX;
  28. mVelocityY = vY;
  29. }
  31. }

7.运行演示

通过碰撞检测运行的结果如下:







本例子源代码:http://download.csdn.net/detail/cen616899547/4737237

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