bursts : Array.<ParticleBurst>

An array of ParticleBurst, emitting bursts of particles at periodic times.

Default Value: undefined

complete : Event

当粒子系统到达生命的尽头时,会发射一个事件.

emissionRate : number

每秒发射颗粒的数量.

Default Value: 5

emitter : ParticleEmitter

此粒子发射器

Default Value: CircleEmitter

emitterModelMatrix : Matrix4

4x4变换矩阵,在粒子系统局部坐标系统内转换粒子系统发射器.

Default Value: Matrix4.IDENTITY

endColor : Color

粒子末期的颜色.

Default Value: Color.WHITE

endScale : number

最终尺度适用于粒子生命末期的图像.

Default Value: 1.0

image : object

用于公告牌的 NT 0 ,HTML ImageElement,或HTML CanvasElement.

Default Value: undefined

isComplete : boolean

当 NT 0 real NT 1 时,粒子系统已到达寿命结束; NT 2 false NT 3 否则.

lifetime : number

粒子系统会发射粒子多久,以秒计.

Default Value: -NT=0=- 翻译:

loop : boolean

粒子系统是否应该循环,当它完成时它就会爆发.

Default Value: true

maximumImageSize : Cartesian2

按高度设置最大约束,宽度,在下方以像素随机标出粒子图像的尺寸.

Default Value: new Cartesian2(1.0, 1.0)

maximumMass : number

设定以公斤计的粒子的最大质量.

Default Value: 1.0

maximumParticleLife : number

设定粒子寿命可能持续时间的最大约束数以秒为单位,在下方随机选择粒子的实际寿命.

Default Value: 5.0

maximumSpeed : number

设定最大约束, 以每秒米计, 下方将随机选择一个粒子的实际速度 .

Default Value: 1.0

minimumImageSize : Cartesian2

设置最小的边框,宽度按高度排列,在高度之上可以随机对粒子图像的维度进行像素的缩放.

Default Value: new Cartesian2(1.0, 1.0)

minimumMass : number

设定以公斤计的颗粒最小质量.

Default Value: 1.0

minimumParticleLife : number

Sets the minimum bound in seconds for the possible duration of a particle's life above which a particle's actual life will be randomly chosen.

Default Value: 5.0

minimumSpeed : number

设置最小约束, 以每秒米计, 将随机选择一个粒子的实际速度 .

Default Value: 1.0

modelMatrix : Matrix4

将粒子系统从模型转化为世界坐标的4x4变换矩阵.

Default Value: Matrix4.IDENTITY

show : boolean

是否显示粒子系统 .

Default Value: true

sizeInMeters : boolean

如果粒子大小是米数或像素,则获取或设定. Treal 以米表示颗粒大小;否则,大小为像素.

Default Value: false

startColor : Color

粒子初生时的颜色.

Default Value: Color.WHITE

startScale : number

初始尺度适用于粒子生命初期的图像.

Default Value: 1.0

updateCallback : ParticleSystem.updateCallback

An array of force callbacks. The callback is passed a Particle and the difference from the last time

Default Value: undefined

destroy()

Destroys the WebGL resources held by this object. Destroying an object allows for deterministic 释放 WebGL 资源,而不是依赖垃圾收集器来摧毁此对象.

Once an object is destroyed, it should not be used; calling any function other than isDestroyed will result in a DeveloperError exception. Therefore, assign the return value (undefined) to the object as done in the example.

Throws:

• DeveloperError : This object was destroyed, i.e., destroy() was called.

See:

• ParticleSystem#isDestroyed

isDestroyed() → boolean

如果此对象被销毁, 返回真实; 否则, 错误 .

If this object was destroyed, it should not be used; calling any function other than isDestroyed will result in a DeveloperError exception.

Returns:

true if this object was destroyed; otherwise, false.

See:

• ParticleSystem#destroy

Cesium.ParticleSystem.updateCallback(particle, dt)

一个函数,用于在每个时间步修改粒子的属性. 这可以包括改变力, 颜色,尺寸等.

Name	Type	Description
particle	Particle	粒子正在更新.
dt	number	上次更新后的几秒钟.

Example:

function applyGravity(particle, dt) {
   const position = particle.position;
   const gravityVector = Cesium.Cartesian3.normalize(position, new Cesium.Cartesian3());
   Cesium.Cartesian3.multiplyByScalar(gravityVector, GRAVITATIONAL_CONSTANT * dt, gravityVector);
   particle.velocity = Cesium.Cartesian3.add(particle.velocity, gravityVector, particle.velocity);
}