andengine 粒子系统

ParticleEmitter类：发射形状
CircleParticleEmitter(final float pCenterX, final float pCenterY,
final float pRadius)；圆形发射器
CircleParticleEmitter(final float pCenterX, final float
pCenterY, final float pRadiusX, final float pRadiusY)；椭圆发射器
CircleOutlineParticleEmitter；与上面相同，只是发射位置为图形边缘
RectangleParticleEmitter；矩形发射器，当长或宽为0时，为一条直线
PointParticleEmitter；点发射器

ParticleInitializer类：初始设定
VelocityParticleInitializer：设定粒子初始速度
RotationParticleInitializer：旋转角度
ColorParticleInitializer：颜色
。。。。。。

ParticleModifier类：Particle修改器
与Entity修改器一样

setParticlesSpawnEnabled();启动或生成粒子。

例：

CircleParticleEmitter emitter=new
CircleParticleEmitter(CAMERA_WIDTH*0.5f, CAMERA_HEIGHT*0.5f,
40);
SpriteParticleSystem particlesystem=new
SpriteParticleSystem(emitter, 100, 100, 500, bg2,
getVertexBufferObjectManager());
particlesystem.addParticleInitializer(new
ColorParticleInitializer(Color.RED));
particlesystem.addParticleInitializer(new
AlphaParticleInitializer(0));
particlesystem.addParticleInitializer(new
BlendFunctionParticleInitializer(GLES20.GL_SRC_ALPHA,
GLES20.GL_ONE));
   
particlesystem.addParticleInitializer(new
VelocityParticleInitializer(-5, 5, 20, 10));//
前两个值为横向加速度的取值范围，后面两个值为纵向加速度取值范围  
   
particlesystem.addParticleInitializer(new
RotationParticleInitializer(0.0f, 360.0f));// 旋转角度取值范围
 
   
particlesystem.addParticleInitializer(new
ExpireParticleInitializer(6));// 单个粒子持续时间  

   
particlesystem.addParticleModifier(new ScaleParticleModifier(0, 5,
1.0f, 2.0f));// 粒子产生过程0-5秒从原始大小变为2倍大小  
   
particlesystem.addParticleModifier(new ColorParticleModifier(0, 3,
1, 1, 0, 0.5f, 0, 0));// 0-3秒间的颜色变化  
   
particlesystem.addParticleModifier(new ColorParticleModifier(4, 6,
1, 1, 0.5f, 1, 0, 1));// 4-6秒间的颜色变化  
   
particlesystem.addParticleModifier(new AlphaParticleModifier(0, 1,
0, 1));// 0-1秒间透明度变化  
   
particlesystem.addParticleModifier(new AlphaParticleModifier(5, 6,
1, 0));// 5-6秒间透明度变化  

   
scene.attachChild(particlesystem);