andengine 粒子系統

ParticleEmitter類：發射形狀

CircleParticleEmitter(final float pCenterX, final float pCenterY, final float pRadius)；圓形發射器

CircleParticleEmitter(final float pCenterX, final float pCenterY, final float pRadiusX, final float pRadiusY)；橢圓發射器

CircleOutlineParticleEmitter；與上面相同，只是發射位置爲圖形邊緣

RectangleParticleEmitter；矩形發射器，當長或寬爲0時，爲一條直線

PointParticleEmitter；點發射器

 

ParticleInitializer類：初始設定

VelocityParticleInitializer：設定粒子初始速度

RotationParticleInitializer：旋轉角度

ColorParticleInitializer：顏色

。。。。。。

 

ParticleModifier類：Particle修改器

與Entity修改器一樣

 

setParticlesSpawnEnabled();啓動或生成粒子。

 

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));// 前兩個值爲橫向加速度的取值範圍，後面兩個值爲縱向加速度取值範圍  

    particlesystem.addParticleInitializer(new RotationParticleInitializer(0.0f, 360.0f));// 旋轉角度取值範圍  

    particlesystem.addParticleInitializer(new ExpireParticleInitializer(6));// 單個粒子持續時間  

 

    particlesystem.addParticleModifier(new ScaleParticleModifier(0, 5, 1.0f, 2.0f));// 粒子產生過程0-5秒從原始大小變爲2倍大小  

    particlesystem.addParticleModifier(new ColorParticleModifier(0, 3, 1, 1, 0, 0.5f, 0, 0));// 0-3秒間的顏色變化  

    particlesystem.addParticleModifier(new ColorParticleModifier(4, 6, 1, 1, 0.5f, 1, 0, 1));// 4-6秒間的顏色變化  

    particlesystem.addParticleModifier(new AlphaParticleModifier(0, 1, 0, 1));// 0-1秒間透明度變化  

    particlesystem.addParticleModifier(new AlphaParticleModifier(5, 6, 1, 0));// 5-6秒間透明度變化  

 

    scene.attachChild(particlesystem);