vue中cesium自定义材料之流动线条效果

import Cesium from 'cesium/Cesium'

/*
流动纹理线
 color 颜色
 duration 持续时间 毫秒
*/
function PolylineTrailLinkMaterialProperty (color, duration) {
  this._definitionChanged = new Cesium.Event()
  this._color = undefined
  this._colorSubscription = undefined
  this.color = color
  this.duration = duration
  this._time = new Date().getTime()
}
Cesium.defineProperties(PolylineTrailLinkMaterialProperty.prototype, {
  isConstant: {
    get: function () {
      return false
    }
  },
  definitionChanged: {
    get: function () {
      return this._definitionChanged
    }
  },
  color: Cesium.createPropertyDescriptor('color')
})
PolylineTrailLinkMaterialProperty.prototype.getType = function (time) {
  return 'PolylineTrailLink'
}
PolylineTrailLinkMaterialProperty.prototype.getValue = function (time, result) {
  // debugger
  if (!Cesium.defined(result)) {
    result = {}
  }
  result.color = Cesium.Property.getValueOrClonedDefault(
    this._color,
    time,
    Cesium.Color.WHITE,
    result.color
  )
  result.image = Cesium.Material.PolylineTrailLinkImage
  result.time =
    ((new Date().getTime() - this._time) % this.duration) / this.duration
  return result
}
PolylineTrailLinkMaterialProperty.prototype.equals = function (other) {
  return (
    this === other ||
    (other instanceof PolylineTrailLinkMaterialProperty &&
      Property.equals(this._color, other._color))
  )
}
Cesium.PolylineTrailLinkMaterialProperty = PolylineTrailLinkMaterialProperty
Cesium.Material.PolylineTrailLinkType = 'PolylineTrailLink'
Cesium.Material.PolylineTrailLinkImage = require('../assets/layout/cable.png')
Cesium.Material.PolylineTrailLinkSource =
  'czm_material czm_getMaterial(czm_materialInput materialInput)

                                                      {

                                                           czm_material material = czm_getDefaultMaterial(materialInput);

                                                           vec2 st = materialInput.st;

                                                           vec4 colorImage = texture2D(image, vec2(fract(st.s - time), st.t));

                                                           material.alpha = colorImage.a * color.a;

                                                           material.diffuse = (colorImage.rgb+color.rgb)/2.0;

                                                           return material;

                                                       }'
Cesium.Material._materialCache.addMaterial(
  Cesium.Material.PolylineTrailLinkType,
  {
    fabric: {
      type: Cesium.Material.PolylineTrailLinkType,
      uniforms: {
        color: new Cesium.Color(1.0, 0.0, 0.0, 0.5),
        image: Cesium.Material.PolylineTrailLinkImage,
        time: 0
      },
      source: Cesium.Material.PolylineTrailLinkSource
    },
    translucent: function (material) {
      return true
    }
  }
)

this.loopMaterial = new Cesium.PolylineTrailLinkMaterialProperty(
      Cesium.Color.AQUA,
      3750
    )