Question

我有兴趣开发一个粒子引擎，我可以称之为.createCollisionEffect(pos x, pos y, float duration);

引擎将在指定的持续时间内创建一个随机方向的粒子杂散。我发现以下代码，但我想使用3种不同的纹理，所以它随机选择一个，但我不知道如何管理时间和3种不同的纹理：我找到了以下代码：

    public ParticleSystem createParticleSystem(final TextureRegion textureRegion) {
    //X & Y for the particles to spawn at.
    final float particlesXSpawn = 400;
    final float particlesYSpawn = 300;

    //Max & min rate are the maximum particles per second and the minimum particles per second.
    final float maxRate = 10;
    final float minRate = 5;

    //This variable determines the maximum particles in the particle system.
    final int maxParticles = 100;

    //Particle emitter which will set all of the particles at a ertain point when they are initialized.
    final PointParticleEmitter pointParticleEmtitter = new PointParticleEmitter(particlesXSpawn, particlesYSpawn);

    //Creating the particle system.
    final ParticleSystem particleSystem = new ParticleSystem(pointParticleEmtitter, maxRate, minRate, maxParticles, textureRegion);

    //And now, lets create the initiallizers and modifiers.
    //Velocity initiallizer - will pick a random velocity from -20 to 20 on the x & y axes. Play around with this value.
    particleSystem.addParticleInitializer(new VelocityInitializer(-20, 20, -20, 20));

    //Acceleration initializer - gives all the particles the earth gravity (so they accelerate down).
    particleSystem.addParticleInitializer(new GravityInitializer());

    //And now, adding an alpha modifier, so particles slowly fade out. This makes a particle go from alpha = 1 to alpha = 0 in 3 seconds, starting exactly when the particle is spawned.
    particleSystem.addParticleModifier((IParticleModifier) new AlphaModifier(3, 1, 0));

    //Lastly, expire modifier. Make particles die after 3 seconds - their alpha reached 0.
    particleSystem.addParticleModifier(new ExpireModifier(3));  

    return particleSystem;
}

有人可以提供一些指导吗？提前谢谢！

Answer 1

您在上面的代码中有基础知识。以下是如何做你想要的：

创建particleEmitter
创建粒子系统
添加修饰符和初始值设定项，为粒子提供所需的行为。

现在秘诀是：

停止您的粒子系统：particleSystem.setParticlesSpawnEnabled(false);
在碰撞时，使用以下方法将粒子发射器移动到应发射粒子的位置：particleEmitter.setCenter(xPosition , yPosition);
启动TimerHandler以在产生粒子的时间结束时关闭粒子。 TimerHandler是一个Andengine类，它像处理程序一样工作，但暂停和恢复游戏。

那应该做啊！

Andengine粒子碰撞效果（Android游戏开发）

1 个答案: