cocos2d 创建 CCParticlySystemQuad答案

【问题标题】：cocos2d create CCParticlySystemQuadcocos2d 创建 CCParticlySystemQuad
【发布时间】：2012-08-24 19:19:27
【问题描述】：

这个函数什么都不做，大约 30 秒后 fps 开始下降。我想知道如何正确显示 ccparticle。

这是我的代码：

-(void) coccomilk:(CGPoint) p{

   CCParticleSystemQuad *milk = [[[CCParticleSystemQuad alloc] initWithTotalParticles:100 ] autorelease];

   milk.texture = [[CCTextureCache sharedTextureCache] addImage:@"milk.png"];
   milk.emitterMode = kCCParticleModeGravity;
   milk.totalParticles = 100;
   //milk.particleCount = 100;
   milk.life = 0.2f;
   milk.lifeVar = 0.1f;
   milk.startSize = 32;
   milk.startSizeVar = 32;
   milk.endSize = 2;
   milk.endSizeVar = 0;
   milk.angle = 90;
   milk.angleVar = 42;
   //milk.rotation = 0;
   //milk.rotatePerSecond = 0;
   //milk.rotatePerSecondVar = 0;
   milk.speed = 651;
   milk.speedVar= 335.5;
   milk.gravity = ccp(0,-2.72);
   //milk.blendAdditive = NO;
   milk.duration = 0.08;
   //milk.blendFunc = (ccBlendFunc) {GL_ONE,GL_DST_ALPHA} ;
   milk.emissionRate = milk.particleCount / milk.life;
   milk.radialAccel = 0;
   milk.radialAccelVar = 0;
   milk.tangentialAccel = 0;
   milk.tangentialAccelVar = 0;
   ccColor4F color = {1.0f,1.0f,1.0f,0.8f};
   milk.startColor = color;
   milk.startColorVar = (ccColor4F) {0.0f,0.0f,0.0f,0.0f};
   milk.endColor = color;
   milk.endColorVar = (ccColor4F) {0.0f,0.0f,0.0f,0.0f};
   milk.position = ccp(p.x,p.y);
   //milk.posVar = 0.0;
   milk.sourcePosition =  ccp(p.x,p.y);
   milk.visible = YES;

   [self addChild:milk z:2];

   milk.autoRemoveOnFinish = YES;
   [milk release];
   //[self performSelector:@selector(clearSprite:) withObject:water afterDelay:0.4];
}

【问题讨论】：

标签： cocos2d-iphone ccparticlesystem

【解决方案1】：

还有更多错误：

emissionRate 错误。你是从实际的粒子数来算的，初始化的时候是0。您的emissionRate 为0，这意味着不会发射任何粒子。正确的计算是：
```
milk.emissionRate = milk.totalParticles / milk.life;
```
版本太多。它将在最后一个版本 (autoRemoveOnFinish) 上崩溃，因此请从您的代码中删除最后一个 [milk release]。您的粒子系统将在其生命周期结束后释放 - 这就是 autoRemoveOnFinish 的用途 - 因此您无需手动执行。

【讨论】：

【解决方案2】：

我建议你试试 ParticleDesigner，这是一个轻量级的应用程序，它允许以图形方式设计你需要的粒子，一旦你满意，就会生成 cocos2d 可以管理的配置文件。 http://particledesigner.71squared.com/

【讨论】：