cesium流动线与电子围栏

 网上找了很多案例，但是在使用中报错

流动线Cannot add property PolylineTrailMaterialProperty, object is not extensible

电子围栏Cannot add property DynamicWallMaterialProperty, object is not extensible，

在绘制流动线时，通过githup上找到解决方法https://gist.github.com/onsummer/02ea3f43c944cba467be585d76a6bb52

效果图片

PolylineTrailLinkMaterialProperty.js

import { Color, defined, Event, Material, Property } from 'cesium'

const PolylineTrailLinkType = 'PolylineTrailLink'
//time用于控制时间，值越小，速度越快，colorImage控制纹理样式，
// vec4 sampledColor = texture2D(image, vec2(fract(3.0*st.s - time), st.t));
//3.0代表纹理个数，st.t纵向，st.s横向，-time代表逆时针，+time代表顺时针
const PolylineTrailLinkSource = /* glsl */`
czm_material czm_getMaterial(czm_materialInput materialInput) 
{
  czm_material material = czm_getDefaultMaterial(materialInput);
  vec2 st = materialInput.st;
  vec4 sampledColor = texture2D(image, vec2(fract(3.0*st.s - time), st.t));
  material.alpha = sampledColor.a * color.a;
  material.diffuse = (sampledColor.rgb + color.rgb) / 2.0;
  return material;
}
`

class PolylineTrailLinkMaterialProperty {
  /**
   * 构造方法
   * @param {String} image 图片路径，确保为程序能访问到的正常 URL
   * &