serviceArea

方法概述

方法详细说明

solve(url, params, requestOptions){Promise<ServiceAreaSolveResult>}

根据一组参数确定服务区域。

参数

url String 表示网络分析服务的 GeoScene Server REST 资源的 URL。

params ServiceAreaParameters 定义服务区域所需的参数。

requestOptions Object optional 用于数据请求的附加选项（将覆盖构造期间定义的 requestOptions）。

返回

类型	描述
Promise<ServiceAreaSolveResult>	解析后，返回 ServiceAreaSolveResult 的实例 。

示例

require([
  "geoscene/config",
  "geoscene/Map",
  "geoscene/views/MapView",
  "geoscene/rest/serviceArea",
  "geoscene/rest/support/ServiceAreaParameters",
  "geoscene/rest/support/FeatureSet",
  "geoscene/Graphic",
  ...
], function(geosceneConfig, Map, MapView, serviceArea, ServiceAreaParams, FeatureSet, Graphic, ...) {

  // API key from developer's account
   
  // authenticates for the basemap and the serviceArea request
  geosceneConfig.apiKey = "YOUR_API_KEY";

  const map = new Map({
    basemap: "arcgis-newspaper"
  });

  const view = new MapView({
    container: "viewDiv",
    map: map,
    center: [-116.53818, 33.82586]
    zoom: 11
  });

  const serviceAreaUrl = "https://route-api.geoscene.cn/geoscene/rest/services/World/ServiceAreas/NAServer/ServiceArea_World/solveServiceArea";

  view.on("click", function(event){
    const locationGraphic = createGraphic(event.mapPoint);
    const serviceAreaParams = createServiceAreaParams(locationGraphic, view.spatialReference);
    solveServiceArea(serviceAreaUrl, serviceAreaParams);
  });

  // Create the location graphic
  function createGraphic(point) {
    view.graphics.removeAll();
    const graphic = new Graphic({
      geometry: point,
      symbol: {
        type: "simple-marker",
        color: "white",
        size: 8
      }
    });
    view.graphics.add(graphic);
    return graphic;
  }

  function createServiceAreaParams(locationGraphic, outSpatialReference) {
    // Create one or more locations (facilities) to solve for
    const featureSet = new FeatureSet({
      features: [locationGraphic]
    });

    // Set all of the input parameters for the service
    const serviceAreaParameters = new ServiceAreaParams({
      facilities: featureSet,
      trimOuterPolygon: true,
      outSpatialReference: outSpatialReference
    });
    return serviceAreaParameters;
  }

  function solveServiceArea(url, serviceAreaParams) {
    return serviceArea.solve(url, serviceAreaParams)
      .then(function(result){
        if (result.serviceAreaPolygons.length) {
          // Draw each service area polygon
          result.serviceAreaPolygons.forEach(function(graphic){
            graphic.symbol = {
              type: "simple-fill",
              color: "rgba(62,13,94,.25)"
            }
            view.graphics.add(graphic,0);
          });
        }
      }, function(error){
           console.log(error);
         });
  }
});