Cesium JS API
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CircleEmitter

CircleEmitter 是一个基于 Cesium.js 的类，用于在三维场景中生成圆形粒子效果。

安装

通过 CDN 引用，将以下代码添加到 HTML 文件中即可使用：

<script src="https://cesium.com/downloads/cesiumjs/releases/1.84/Build/Cesium/Cesium.js"></script>
<link rel="stylesheet" href="https://cesium.com/downloads/cesiumjs/releases/1.84/Build/Cesium/Widgets/widgets.css">

使用

创建 CircleEmitter 实例：

const viewer = new Cesium.Viewer("cesiumContainer");

const emitter = new Cesium.CircleEmitter({
  center: Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883, 100),
  radius: 250.0,
  particleLife: 5.0,
});

将 emitter 添加到 Viewer 中（如果需要）：

viewer.scene.primitives.add(emitter);

调用 emitter.start() 方法启动粒子效果：

emitter.start();

API

CircleEmitter(options)

创建一个 CircleEmitter 实例。

接受一个对象作为参数，对象包含以下属性：

属性名 类型 默认值 描述
center Cesium.Cartesian3 必需 圆心位置。
radius Number 必需 圆的半径。
particleLife Number 5.0 粒子生命周期（以秒为单位）。
particlesPerSecond Number 5.0 每秒生成粒子的数量。
emitterModelMatrix Cesium.Matrix4 undefined 用于定位发射器的矩阵。
emitterModelMatrixFunc Function undefined 从时间中获取位置、方向和缩放因子的回调函数。
emitterWidth Number undefined 沿方向轴的最大宽度, 以米为单位。
emitterShape Number 0 发射器表面的形状。0：圆形，1：方形，2：球形，3：盒形。
minimumParticleSize Number 1.0 粒子的最小大小（以像素为单位）。
maximumParticleSize Number 5.0 粒子的最大大小（以像素为单位）。
image String undefined 粒子的图片路径。
color Cesium.Color Cesium.Color.WHITE 粒子的颜色。
minimumSpeed Number 1.0 粒子的最小速度（以米/秒为单位）。
maximumSpeed Number 30.0 粒子的最大速度（以米/秒为单位）。
lifeTime Number undefined 发射器的生命周期。如果未定义，则发射器将持续到手动停止或重置。

CircleEmitter.prototype.start()

启动粒子效果。

CircleEmitter.prototype.stop()

停止粒子效果并清空粒子。

CircleEmitter.prototype.reset()

重置粒子效果。

CircleEmitter.prototype.update(time)

更新粒子效果。

接受一个以秒为单位的时间值作为参数，用于更新粒子生命周期和位置。

CircleEmitter.prototype.show

设置或获取粒子效果的可见性属性。

emitter.show = true; // 显示粒子
emitter.show = false; // 隐藏粒子
const isVisible = emitter.show; // 获取粒子的可见性状态