vue2+arcgis添加流动风场效果

要在 Vue2 中添加流动风场效果，需要使用 ArcGIS API for JavaScript。以下是一些步骤：

1. 安装 ArcGIS API for JavaScript：

npm install --save @arcgis/core

2. 在 Vue 项目中引入 ArcGIS API for JavaScript：

import * as esriLoader from 'esri-loader';

esriLoader.loadModules([
  "esri/Map",
  "esri/views/MapView",
  "esri/layers/FeatureLayer",
  "esri/symbols/SimpleLineSymbol",
  "esri/renderers/SimpleRenderer",
  "esri/layers/GraphicsLayer",
  "esri/Graphic",
  "esri/geometry/Polyline",
  "esri/symbols/ArrowSymbol3D",
  "esri/symbols/LabelSymbol3D",
  "esri/symbols/TextSymbol3DLayer",
  "esri/symbols/PolygonSymbol3D",
  "esri/layers/SceneLayer",
  "esri/symbols/SimpleFillSymbol",
  "esri/renderers/UniqueValueRenderer",
  "esri/symbols/TextSymbol",
  "esri/symbols/PictureMarkerSymbol",
  "esri/layers/MapImageLayer",
  "esri/layers/WebTileLayer",
  "esri/widgets/Legend",
  "esri/geometry/Point",
  "esri/symbols/SimpleMarkerSymbol",
  "esri/widgets/Search",
  "esri/widgets/Locate",
  "esri/tasks/Locator",
  "esri/widgets/Measurement",
  "esri/widgets/AreaMeasurement2D",
  "esri/widgets/DistanceMeasurement2D",
  "esri/layers/TileLayer",
  "esri/layers/ImageryLayer",
  "esri/layers/VectorTileLayer",
  "esri/widgets/Home",
  "esri/widgets/BasemapGallery",
  "esri/widgets/CoordinateConversion",
  "esri/widgets/Bookmarks",
  "esri/widgets/Print",
  "esri/tasks/support/Query",
  "esri/tasks/QueryTask",
  "esri/tasks/IdentifyTask",
  "esri/tasks/support/IdentifyParameters",
  "esri/tasks/support/Query",
  "esri/tasks/support/StatisticDefinition",
  "esri/widgets/Expand",
  "esri/core/watchUtils",
  "esri/geometry/SpatialReference",
  "esri/geometry/Extent",
  "esri/geometry/Polygon",
  "esri/geometry/geometryEngine",
  "esri/config",
  "esri/request",
  "esri/Color",
  "esri/geometry/support/webMercatorUtils",
  "esri/geometry/geometryEngineAsync",
  "esri/geometry/SpatialReference",
  "esri/layers/StreamLayer",
], {
  css: true
}).then(([
  Map,
  MapView,
  FeatureLayer,
  SimpleLineSymbol,
  SimpleRenderer,
  GraphicsLayer,
  Graphic,
  Polyline,
  ArrowSymbol3D,
  LabelSymbol3D,
  TextSymbol3DLayer,
  PolygonSymbol3D,
  SceneLayer,
  SimpleFillSymbol,
  UniqueValueRenderer,
  TextSymbol,
  PictureMarkerSymbol,
  MapImageLayer,
  WebTileLayer,
  Legend,
  Point,
  SimpleMarkerSymbol,
  Search,
  Locate,
  Locator,
  Measurement,
  AreaMeasurement2D,
  DistanceMeasurement2D,
  TileLayer,
  ImageryLayer,
  VectorTileLayer,
  Home,
  BasemapGallery,
  CoordinateConversion,
  Bookmarks,
  Print,
  Query,
  QueryTask,
  IdentifyTask,
  IdentifyParameters,
  StatisticDefinition,
  Expand,
  watchUtils,
  SpatialReference,
  Extent,
  Polygon,
  geometryEngine,
  esriConfig,
  esriRequest,
  Color,
  webMercatorUtils,
  geometryEngineAsync,
  SpatialReference2,
  StreamLayer
]) => {
  // 将这些模块作为参数传递给组件
  // ...
})

3. 创建一个 MapView 组件：

<template>
  <div class="map-container">
    <div class="map" ref="map"></div>
  </div>
</template>

<script>
export default {
  name: 'MapView',
  data() {
    return {
      map: null,
      view: null,
      streamLayer: null,
      windDirection: 0,
      windSpeed: 0,
      windVariation: 0,
      windLayerUrl: ''
    }
  },
  mounted() {
    this.initMap();
  },
  methods: {
    async initMap() {
      const [Map, MapView] = await esriLoader.loadModules([
        "esri/Map",
        "esri/views/MapView"]);

      // 创建地图
      this.map = new Map({
        basemap: "streets-navigation-vector"
      });

      // 创建 MapView
      this.view = new MapView({
        container: this.$refs.map,
        map: this.map,
        center: [-118.71511,34.09042],
        zoom: 9
      });

      // 在地图上添加流动风场图层
      this.addStreamLayer();
    },

    async addStreamLayer() {
      const [StreamLayer] = await esriLoader.loadModules(["esri/layers/StreamLayer"]);

      // 风场图层 URL
      this.windLayerUrl = "https://services.arcgis.com/7JUzYtqTbU7kbDUo/arcgis/rest/services/Wind_Stream_Layer/FeatureServer/0";

      // 创建从服务器动态下载数据的流动风场图层
      this.streamLayer = new StreamLayer({
        url: this.windLayerUrl,
        purgeOptions: {
          displayCount: 10000
        },
        renderer: {
          type: "simple",
          symbol: {
            type: "simple-line",
            color: [255, 255, 255, 0.5],
            width: 1,
            style: "solid"
          }
        }
      });

      // 将图层添加到地图中
      this.map.add(this.streamLayer);

      // 监听风向和风速的变化
      this.streamLayer.on("update", this.updateWind);
    },

    updateWind(event) {
      if (event) {
        // 获取风向、风速、风向变化量
        this.windDirection = event.windDirection || 0;
        this.windSpeed = event.windSpeed || 0;
        this.windVariation = event.windVariation || 0;
      }

      // 根据风向和变化量计算箭头的偏移角度
      const angle = this.windDirection + this.windVariation;

      // 创建箭头符号
      const arrowSymbol = new ArrowSymbol3D({
        size: 6,
        height: 20,
        width: 10,
        color: "red"
      });

      // 创建标签符号
      const labelSymbol = new LabelSymbol3D({
        symbolLayers: [new TextSymbol3DLayer({
          material: {
            color: "black"
          },
          size: 20,
          text: `${this.windSpeed} mph`
        })]
      });

      // 创建风向线符号
      const lineSymbol = new SimpleLineSymbol({
        color: "white",
        width: 2,
        style: "solid"
      });

      // 创建面符号
      const fillSymbol = new PolygonSymbol3D({
        symbolLayers: [
          {
            type: "extrude",
            size: 10,
            material: {
              color: "red"
            }
          }
        ]
      });

      // 创建风向线
      const polyline = new Polyline({
        paths: [[[0, 0], [0, 30]]],
        spatialReference: {
          wkid: 4326
        }
      });

      // 旋转风向线并添加到箭头符号中
      arrowSymbol.symbolLayers.add(new Symbol3DLayer({
        symbol: lineSymbol.clone().rotate(angle),
        width: 10
      }));

      // 添加箭头符号和标签符号到风场图层
      event.features.forEach(feature => {
        feature.symbol = arrowSymbol;
        feature.labelSymbol = labelSymbol;
        feature.geometry = geometryEngineAsync.rotate(feature.geometry, angle, new Point({ x: feature.geometry.extent.center.x, y: feature.geometry.extent.center.y }));
      });

      // 更新风场图层
      this.streamLayer.refresh();
    }
  }
}
</script>

在这个例子中，我们使用了 `StreamLayer` 来实现流动风场效果。在 `addStreamLayer` 方法中，我们创建了一个 `StreamLayer` 对象，并将其添加到地图中。然后，我们监听 `StreamLayer` 的 `update` 事件来更新风向和风速，并计算箭头的偏移角度。最后，我们创建箭头、标签和风向线符号，并将它们添加到 `StreamLayer` 上的每个要素中。注意，这里我们使用了 `ArrowSymbol3D` 和 `LabelSymbol3D` 来创建箭头和标签符号。

在 `updateWind` 方法中，我们首先获取风向、风速和风向变化量，然后计算箭头的偏移角度。接着，我们创建箭头、标签、风向线和面符号，并将它们添加到要素中。最后，我们旋转风向线并更新风场图层。

这就是如何在 Vue2 中使用 ArcGIS API for JavaScript 添加流动风场效果的基本步骤。