java - AndEngine粒子系统

Question

我想使用 AndEngine 的粒子系统来创建一个飞溅(如飞溅的水)。

我已经查看了粒子系统示例，但不确定需要做什么才能使用粒子系统创建水的飞溅效果。

有什么想法吗？

Answer 1

我不知道任何水溅模拟算法，所以我会按照我的想法去做，但你必须修改才能让它看起来真实。

2D 中的水溅动画将从一个位置产生许多小水滴，然后以初始速度将每个小水滴发送到不同的方向，然后每个水滴减速并淡出。

试试这个:

public ParticleSystem createParticleSystem(final TextureRegion waterDropTextureRegion) {
    //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, waterDropTextureRegion);

    //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(new AlphaModifier(1, 0, 0, 3));

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

    return particleSystem;
}

我还没有测试过，但我认为它会起作用。尝试使用这些值来找到看起来逼真的动画。

该方法接收一个参数，该参数是每个粒子的现成纹理区域，在您的情况下我猜那是一滴水。

调用此方法并获得 ParticleSystem 后，只需将其附加到您的场景即可:

final ParticleSystem particleSystem = createParticleSystem(...);
scene.attachChild(particleSystem);