// Load the Visualization API and the columnchart package.// @ts-ignore TODO update to newest visualization librarygoogle.load("visualization","1",{packages:["columnchart"]});functioninitMap():void{// The following path marks a path from Mt. Whitney, the highest point in the// continental United States to Badwater, Death Valley, the lowest point.constpath=[{lat:36.579,lng:-118.292},// Mt. Whitney{lat:36.606,lng:-118.0638},// Lone Pine{lat:36.433,lng:-117.951},// Owens Lake{lat:36.588,lng:-116.943},// Beatty Junction{lat:36.34,lng:-117.468},// Panama Mint Springs{lat:36.24,lng:-116.832},];// Badwater, Death Valleyconstmap=newgoogle.maps.Map(document.getElementById("map")asHTMLElement,{zoom:8,center:path[1],mapTypeId:"terrain",});// Create an ElevationService.constelevator=newgoogle.maps.ElevationService();// Draw the path, using the Visualization API and the Elevation service.displayPathElevation(path,elevator,map);}functiondisplayPathElevation(path:google.maps.LatLngLiteral[],elevator:google.maps.ElevationService,map:google.maps.Map){// Display a polyline of the elevation path.newgoogle.maps.Polyline({path:path,strokeColor:"#0000CC",strokeOpacity:0.4,map:map,});// Create a PathElevationRequest object using this array.// Ask for 256 samples along that path.// Initiate the path request.elevator.getElevationAlongPath({path:path,samples:256,}).then(plotElevation).catch((e)=>{constchartDiv=document.getElementById("elevation_chart")asHTMLElement;// Show the error code inside the chartDiv.chartDiv.innerHTML="Cannot show elevation: request failed because "+e;});}// Takes an array of ElevationResult objects, draws the path on the map// and plots the elevation profile on a Visualization API ColumnChart.functionplotElevation({results}:google.maps.PathElevationResponse){constchartDiv=document.getElementById("elevation_chart")asHTMLElement;// Create a new chart in the elevation_chart DIV.constchart=newgoogle.visualization.ColumnChart(chartDiv);// Extract the data from which to populate the chart.// Because the samples are equidistant, the 'Sample'// column here does double duty as distance along the// X axis.constdata=newgoogle.visualization.DataTable();data.addColumn("string","Sample");data.addColumn("number","Elevation");for(leti=0;i <results.length;i++){data.addRow(["",results[i].elevation]);}// Draw the chart using the data within its DIV.chart.draw(data,{height:150,legend:"none",// @ts-ignore TODO update to newest visualization librarytitleY:"Elevation (m)",});}declareglobal{interfaceWindow{initMap:()=>void;}}window.initMap=initMap;
index.ts

// Load the Visualization API and the columnchart package.// @ts-ignore TODO update to newest visualization librarygoogle.load("visualization","1",{packages:["columnchart"]});functioninitMap(){// The following path marks a path from Mt. Whitney, the highest point in the// continental United States to Badwater, Death Valley, the lowest point.constpath=[{lat:36.579,lng:-118.292},// Mt. Whitney{lat:36.606,lng:-118.0638},// Lone Pine{lat:36.433,lng:-117.951},// Owens Lake{lat:36.588,lng:-116.943},// Beatty Junction{lat:36.34,lng:-117.468},// Panama Mint Springs{lat:36.24,lng:-116.832},];// Badwater, Death Valleyconstmap=newgoogle.maps.Map(document.getElementById("map"),{zoom:8,center:path[1],mapTypeId:"terrain",});// Create an ElevationService.constelevator=newgoogle.maps.ElevationService();// Draw the path, using the Visualization API and the Elevation service.displayPathElevation(path,elevator,map);}functiondisplayPathElevation(path,elevator,map){// Display a polyline of the elevation path.newgoogle.maps.Polyline({path:path,strokeColor:"#0000CC",strokeOpacity:0.4,map:map,});// Create a PathElevationRequest object using this array.// Ask for 256 samples along that path.// Initiate the path request.elevator.getElevationAlongPath({path:path,samples:256,}).then(plotElevation).catch((e)=>{constchartDiv=document.getElementById("elevation_chart");// Show the error code inside the chartDiv.chartDiv.innerHTML="Cannot show elevation: request failed because "+e;});}// Takes an array of ElevationResult objects, draws the path on the map// and plots the elevation profile on a Visualization API ColumnChart.functionplotElevation({results}){constchartDiv=document.getElementById("elevation_chart");// Create a new chart in the elevation_chart DIV.constchart=newgoogle.visualization.ColumnChart(chartDiv);// Extract the data from which to populate the chart.// Because the samples are equidistant, the 'Sample'// column here does double duty as distance along the// X axis.constdata=newgoogle.visualization.DataTable();data.addColumn("string","Sample");data.addColumn("number","Elevation");for(leti=0;i <results.length;i++){data.addRow(["",results[i].elevation]);}// Draw the chart using the data within its DIV.chart.draw(data,{height:150,legend:"none",// @ts-ignore TODO update to newest visualization librarytitleY:"Elevation (m)",});}window.initMap=initMap;
index.js

<html>  <head>    <title>Showing Elevation Along a Path</title>    <script src="https://www.google.com/jsapi"></script>    <link rel="stylesheet" type="text/css" href="./style.css" />    <script type="module" src="./index.js"></script>  </head>  <body>    <div>      <div></div>      <div></div>    </div>    <!--       The `defer` attribute causes the script to execute after the full HTML      document has been parsed. For non-blocking uses, avoiding race conditions,      and consistent behavior across browsers, consider loading using Promises. See      https://developers.google.com/maps/documentation/javascript/load-maps-js-api      for more information.      -->    <script      src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&v=weekly"      defer    ></script>  </body></html>
index.html