gisthreemap/src/Cesium/extendMaterial/LineFlowMaterialProperty.js

基于webGL的三维api

/*
 * @Description: 飞线效果（参考开源代码）
 * @Version: 1.0
 */
class LineFlowMaterialProperty {
  constructor(options) {
      this._definitionChanged = new Cesium.Event();
      this._color = undefined;
      this._speed = undefined;
      this._percent = undefined;
      this._gradient = undefined;
      this.color = options.color;
      this.speed = options.speed;
      this.percent = options.percent;
      this.gradient = options.gradient;
  };

  get isConstant() {
      return false;
  }

  get definitionChanged() {
      return this._definitionChanged;
  }

  getType(time) {
      return Cesium.Material.LineFlowMaterialType;
  }

  getValue(time, result) {
      if (!Cesium.defined(result)) {
          result = {};
      }

      result.color = Cesium.Property.getValueOrDefault(this._color, time, Cesium.Color.RED, result.color);
      result.speed = Cesium.Property.getValueOrDefault(this._speed, time, 5.0, result.speed);
      result.percent = Cesium.Property.getValueOrDefault(this._percent, time, 0.1, result.percent);
      result.gradient = Cesium.Property.getValueOrDefault(this._gradient, time, 0.01, result.gradient);
      return result
  }

  equals(other) {
      return (this === other ||
          (other instanceof LineFlowMaterialProperty &&
              Cesium.Property.equals(this._color, other._color) &&
              Cesium.Property.equals(this._speed, other._speed) &&
              Cesium.Property.equals(this._percent, other._percent) &&
              Cesium.Property.equals(this._gradient, other._gradient))
      )
  }
}

export default LineFlowMaterialProperty