android - libgdx 粒子效果旋转

Question

我用 libgdx 在我的 android 设备上开火:

ParticleEffect effect;
ParticleEffectPool fireEffectPool;
Array<PooledEffect> effects = new Array<PooledEffect>();

@Override
public void create() 
{
    ...
    effect = new ParticleEffect();
    effect.load(Gdx.files.internal("particles/fire01.p"), Gdx.files.internal("image"));
    effect.setFlip(true, false);
    fireEffectPool = new ParticleEffectPool(effect, 1000, 3000);

    PooledEffect myEffect = fireEffectPool.obtain();
    myEffect.setPosition(200, 400);
    effects.add(myEffect);
    ...
}

我能否以编程方式旋转、设置速度或缩放我的效果？

Answer 1

以这段代码为基础，我找到了粒子效果旋转问题的解决方案 http://badlogicgames.com/forum/viewtopic.php?f=11&t=7060#p32607

并添加一个小的变化来保存效果的幅度。希望能帮助到你。

public void rotateBy(float amountInDegrees) {
    Array<ParticleEmitter> emitters = particleEffect.getEmitters();        
        for (int i = 0; i < emitters.size; i++) {                          
           ScaledNumericValue val = emitters.get(i).getAngle();
           float amplitude = (val.getHighMax() - val.getHighMin()) / 2f;
           float h1 = amountInDegrees + amplitude;                                            
           float h2 = amountInDegrees - amplitude;                                            
           val.setHigh(h1, h2);                                           
           val.setLow(amountInDegrees);       
        }
    }
}