JavaScript ArcGIS Portal.createServiceAreaTask用法及代碼示例

基本信息

以下是所在類或對象的基本信息。

AMD: require(["esri/portal/Portal"], (Portal) => { /* code goes here */ });

ESM: import Portal from "@arcgis/core/portal/Portal";

類： esri/portal/Portal

繼承: Portal > Accessor

自從：用於 JavaScript 4.0 的 ArcGIS API

用法說明

Portal.createServiceAreaTask函數(或屬性)的定義如下：

createServiceAreaTask () {Promise<ServiceAreaTask>}

自從：ArcGIS 適用於 JavaScript 4.12 的 API

已棄用從 4.21 版本開始。請使用 serviceArea 和 helperServices 代替。

一個幫助函數，它返回門戶的 ServiceAreaTask helper service 的實例。

類型	說明
Promise<ServiceAreaTask>	解析後，返回 ServiceAreaTask 的實例。

例子：

// example using "esri/rest/serviceArea" with helperServices

require([
  "esri/portal/Portal",
  "esri/rest/serviceArea",
  "esri/rest/support/ServiceAreaParameters",
  "esri/rest/support/FeatureSet",
  "esri/Graphic",
  ...
], function(Portal, serviceArea, ServiceAreaParams, FeatureSet, Graphic, ...) {

  // create new Portal object with relevant URL
  const portal = new Portal({
     url: "YOUR_PORTAL_URL"
  });

  // load Portal instance
  portal.load();

  view.on("click", function(event){
    const locationGraphic = createGraphic(event.mapPoint);
    const serviceAreaParams = createServiceAreaParams(locationGraphic, view.spatialReference);
    const serviceAreaUrl = portal.helperServices.serviceArea.url;
    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({
      apiKey: "YOUR_API_KEY",
      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);
         });
  }
});

相關用法

注：本文由純淨天空篩選整理自arcgis.com大神的英文原創作品 Portal.createServiceAreaTask。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。

基本信息

用法說明

返回：

例子：