andengine游戏引擎总结进阶篇1

本篇包括虚拟键盘，粒子系统

   1虚拟键盘

      分为两种，一种是单个虚拟键盘，另一种是多个方位虚拟键盘

      1）加载虚拟键盘所需要的图片资源

	private BitmapTextureAtlas mOnScreenControlTexture;
	private ITextureRegion mOnScreenControlBaseTextureRegion;
	private ITextureRegion mOnScreenControlKnobTextureRegion;

 this.mOnScreenControlTexture = new BitmapTextureAtlas(this.getTextureManager(), 256, 128, TextureOptions.BILINEAR);
  this.mOnScreenControlBaseTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mOnScreenControlTexture, this, "onscreen_control_base.png", 0, 0);
  this.mOnScreenControlKnobTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mOnScreenControlTexture, this, "onscreen_control_knob.png", 128, 0);
  this.mOnScreenControlTexture.load();

       2.1）单个虚拟键盘

final AnalogOnScreenControl analogOnScreenControl = new AnalogOnScreenControl(0, CAMERA_HEIGHT - this.mOnScreenControlBaseTextureRegion.getHeight(), this.mCamera, this.mOnScreenControlBaseTextureRegion, this.mOnScreenControlKnobTextureRegion, 0.1f, 200, this.getVertexBufferObjectManager(), new IAnalogOnScreenControlListener() {
			@Override
			public void onControlChange(final BaseOnScreenControl pBaseOnScreenControl, final float pValueX, final float pValueY) {
				

//pValueX	,pVlueY在[-1,1]之间，坐标系pValueX ,pVlueY交集就是方位啦		}

			@Override
			public void onControlClick(final AnalogOnScreenControl pAnalogOnScreenControl) {
				//里边的小的被点击时调用			}
		});
		analogOnScreenControl.getControlBase().setBlendFunction(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE_MINUS_SRC_ALPHA);
		analogOnScreenControl.getControlBase().setAlpha(0.5f);
		analogOnScreenControl.getControlBase().setScaleCenter(0, 128);
		analogOnScreenControl.getControlBase().setScale(1.25f);
		analogOnScreenControl.getControlKnob().setScale(1.25f);
		analogOnScreenControl.refreshControlKnobPosition();

		scene.setChildScene(analogOnScreenControl);

       2.2多个虚拟键盘，下边的是两个

final AnalogOnScreenControl velocityOnScreenControl = new AnalogOnScreenControl(x1, y1, this.mCamera, this.mOnScreenControlBaseTextureRegion, this.mOnScreenControlKnobTextureRegion, 0.1f, this.getVertexBufferObjectManager(), new IAnalogOnScreenControlListener() {
			@Override
			public void onControlChange(final BaseOnScreenControl pBaseOnScreenControl, final float pValueX, final float pValueY) {
				physicsHandler.setVelocity(pValueX * 100, pValueY * 100);
			}

			@Override
			public void onControlClick(final AnalogOnScreenControl pAnalogOnScreenControl) {
				/* Nothing. */
			}
		});
		velocityOnScreenControl.getControlBase().setBlendFunction(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE_MINUS_SRC_ALPHA);
		velocityOnScreenControl.getControlBase().setAlpha(0.5f);

		scene.setChildScene(velocityOnScreenControl);


		/* Rotation control (right). */
		final float y2 = (this.mPlaceOnScreenControlsAtDifferentVerticalLocations) ? 0 : y1;
		final float x2 = CAMERA_WIDTH - this.mOnScreenControlBaseTextureRegion.getWidth();
		final AnalogOnScreenControl rotationOnScreenControl = new AnalogOnScreenControl(x2, y2, this.mCamera, this.mOnScreenControlBaseTextureRegion, this.mOnScreenControlKnobTextureRegion, 0.1f, this.getVertexBufferObjectManager(), new IAnalogOnScreenControlListener() {//0.1f触摸响应时间为0.1秒		@Override
			public void onControlChange(final BaseOnScreenControl pBaseOnScreenControl, final float pValueX, final float pValueY) {
				if(pValueX == x1 && pValueY == x1) {
					face.setRotation(x1);
				} else {
					face.setRotation(MathUtils.radToDeg((float)Math.atan2(pValueX, -pValueY)));
				}
			}

			@Override
			public void onControlClick(final AnalogOnScreenControl pAnalogOnScreenControl) {
				/* Nothing. */
			}
		});
		rotationOnScreenControl.getControlBase().setBlendFunction(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE_MINUS_SRC_ALPHA);
		rotationOnScreenControl.getControlBase().setAlpha(0.5f);

		velocityOnScreenControl.setChildScene(rotationOnScreenControl);//两个键盘的关系

          2粒子系统

                      1）粒子图片资源

	this.mBitmapTextureAtlas = new BitmapTextureAtlas(this.getTextureManager(), 32, 32, TextureOptions.BILINEAR_PREMULTIPLYALPHA);
		this.mParticleTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mBitmapTextureAtlas, this, "particle_point.png", 0, 0);

		this.mBitmapTextureAtlas.load();

                     2）粒子类型

	final CircleOutlineParticleEmitter particleEmitter = new CircleOutlineParticleEmitter(ParticleSystemSimpleExample.CAMERA_WIDTH * 0.5f, ParticleSystemSimpleExample.CAMERA_HEIGHT * 0.5f + 20, 80);//粒子类型

                    3）粒子工场产生的粒子类型，数量等

                     

final SpriteParticleSystem particleSystem = new SpriteParticleSystem(particleEmitter, 60, 60, 360, this.mParticleTextureRegion, this.getVertexBufferObjectManager());//粒子工厂，参数，60,60是粒子的最大与最小生成速率

                  4）粒子的行为方式（旋转，颜色，透明度方面的变化）

                

		particleSystem.addParticleInitializer(new ColorParticleInitializer<Sprite>(1, 0, 0));
		particleSystem.addParticleInitializer(new AlphaParticleInitializer<Sprite>(0));
		particleSystem.addParticleInitializer(new BlendFunctionParticleInitializer<Sprite>(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE));
		particleSystem.addParticleInitializer(new VelocityParticleInitializer<Sprite>(-2, 2, -20, -10));
		particleSystem.addParticleInitializer(new RotationParticleInitializer<Sprite>(0.0f, 360.0f));
		particleSystem.addParticleInitializer(new ExpireParticleInitializer<Sprite>(6));

		particleSystem.addParticleModifier(new ScaleParticleModifier<Sprite>(0, 5, 1.0f, 2.0f));
		particleSystem.addParticleModifier(new ColorParticleModifier<Sprite>(0, 3, 1, 1, 0, 0.5f, 0, 0));
		particleSystem.addParticleModifier(new ColorParticleModifier<Sprite>(4, 6, 1, 1, 0.5f, 1, 0, 1));
		particleSystem.addParticleModifier(new AlphaParticleModifier<Sprite>(0, 1, 0, 1));
		particleSystem.addParticleModifier(new AlphaParticleModifier<Sprite>(5, 6, 1, 0));

                      5）加载粒子到Sence中

                    

		scene.attachChild(particleSystem);

                          6）粒子中心开始位置，开闭等

particleEmitter.setCenter(x,y );
							particleSystem.setParticlesSpawnEnabled(true);