70 lines
1.8 KiB
Markdown
70 lines
1.8 KiB
Markdown
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## 概述
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ParticleSystem 是粒子库的基类，其他粒子库可以继承自 ParticleSystem 实现自己的功能。ParticleSystem 提供了粒子库必须的一些属性和方法，在创建粒子对象时使用了对象池以减少对象创建带来的开销。
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## 属性
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ParticleSystem 提供了粒子系统所必须的一些属性，如：粒子出现间隔、粒子纹理等等。
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** public emissionTime:number = -1; **
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```
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@brief 粒子出现总时间，单位毫秒，取值范围(0,Number.MAX_VALUE]，-1表示无限时间
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```
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** public emissionRate:number; **
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```
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@brief 粒子出现间隔，单位毫秒，取值范围(0,Number.MAX_VALUE]
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```
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** public texture:egret.Texture; **
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```
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@brief 粒子所使用的纹理
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```
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** public emitterX:number = 0; **
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```
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@brief 粒子出现点X坐标，取值范围[-Number.MAX_VALUE,Number.MAX_VALUE] **
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```
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** public emitterY:number = 0; **
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```
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@brief 粒子出现点Y坐标，取值范围[-Number.MAX_VALUE,Number.MAX_VALUE] **
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```
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** public maxParticles:number = 200; **
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```
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@brief 粒子系统最大粒子数，超过该数量将不会继续创建粒子，取值范围[1,Number.MAX_VALUE]
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```
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## 方法
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ParticleSystem 提供了粒子系统所必须的一些方法，如：开始、停止、更换纹理。
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** constructor(texture:egret.Texture, emissionRate:number) **
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```
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@brief 构造函数 @param texture {egret.Texture} 粒子纹理 @param emissionRate {number} 粒子出现间隔
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```
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** public start(duration:number = -1):void **
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```
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@brief 开始创建粒子 @param duration {number} 粒子出现总时间
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```
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** public stop(clear:boolean = false):void **
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```
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@brief 停止创建粒子 @param clear {boolean} 是否清除掉现有粒子
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```
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** public changeTexture(texture:egret.Texture):void **
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```
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@brief 更换粒子纹理 @param texture {egret.Texture} 新的纹理
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```
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