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HTML

              
                <html>
<link rel="stylesheet" href="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.css" type="text/css" />
<script src="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.js"></script>
  
  <!-- Add references to the Azure Maps Map Drawing Tools JavaScript and CSS files. -->
  <link rel="stylesheet" href="https://atlas.microsoft.com/sdk/javascript/drawing/0/atlas-drawing.min.css" type="text/css" />
  <script src="https://atlas.microsoft.com/sdk/javascript/drawing/0/atlas-drawing.min.js"></script>

<body>
  <div id="map"></div>
  
  <img id="loadingIcon" src="https://assets.codepen.io/1717245/loadingIcon.gif" title="Loading" style="position:absolute;left:calc(50% - 25px);top:calc(50% - 25px);display:none;" />
  
  <div class="legend">
        <div style="font-size:14px;font-weight:bold;">Elevation</div>
        <div style="float:left">
            <div class="colorSquare" style="background-color:#d7191c"></div>
            <div class="colorSquare" style="background-color:#fdae61"></div>
            <div class="colorSquare" style="background-color:#ffffbf"></div>
            <div class="colorSquare" style="background-color:#a6d96a"></div>
            <div class="colorSquare" style="background-color:#1a9641"></div>
        </div>
        <div style="float:left;margin:9px 5px 0 5px;">
            <div class="colorSquare">200m</div>
            <div class="colorSquare">150m</div>
            <div class="colorSquare">100m</div>
            <div class="colorSquare">50m</div>
        </div>
    </div>
  
  <div style="position:absolute;top:0px;left:calc(50% - 100px);background-color:white;padding:5px;">Draw a line on the map</div>
</body>

</html>
              
            
!

CSS

              
                html,
body {
  width: 100%;
  height: 100%;
  padding: 0;
  margin: 0;
}

#map {
  width: 100%;
  height: 100%;
}

.legend {
	position: absolute;
	top: 10px;
	right: 10px;
	background-color: white;
	border-radius: 10px;
	padding: 10px;
	font-size: 11px;
}

	.colorSquare {
		width: 16px;
		height: 16px;
		text-align: center;
	}

              
            
!

JS

              
                var map, datasource, layer, drawingManager;

var maxSampleSize = 100;
var colors = ['#1a9641', '#a6d96a', '#ffffbf', '#fdae61', '#d7191c'];
var elvSteps = 50;

var elevationLineUrl = 'https://{azMapsDomain}/elevation/line/json?api-version=1.0&lines={lines}&samples={samples}';

//Initialize a map instance.
var map = new atlas.Map('map', {
    center: [-122.335, 47.608],
  zoom: 12,
  view: 'Auto',
  //Add your Azure Maps subscription client ID to the map SDK. Get an Azure Maps client ID at https://azure.com/maps
    authOptions: {
        authType: "anonymous",
        clientId: "35267128-0f1e-41de-aa97-f7a7ec8c2dbd",
        getToken: function(resolve, reject, map) {
          //URL to your authentication service that retrieves an Azure Active Directory Token.
          var tokenServiceUrl = "https://adtokens.azurewebsites.net/api/HttpTrigger1?code=dv9Xz4tZQthdufbocOV9RLaaUhQoegXQJSeQQckm6DZyG/1ymppSoQ==";

          fetch(tokenServiceUrl).then(r => r.text()).then(token => resolve(token));
        }
    }
});

//Wait until the map resources are ready.
map.events.add('ready', function () {
	//Add a style control to the map.
	map.controls.add(new atlas.control.StyleControl({
		mapStyles: 'all'
	}), {
		position: 'top-left'
	});

	//Create a data source for the route line.
	datasource = new atlas.source.DataSource(null, {
		lineMetrics: true   //Enable line metrics on the data source. This is needed to enable support for strokeGradient.
	});
	map.sources.add(datasource);

	//Create a layer for rendering the line gradient.
	layer = new atlas.layer.LineLayer(datasource, null, {
		strokeWidth: 7,
		lineJoin: 'round',
		lineCap: 'round'
	});
	map.layers.add([
		//Optionally. Add a second line layer behind the gradient layer. This layer will provide a board around the line so it is easier to see the details.
		new atlas.layer.LineLayer(datasource, null, {
			strokeWidth: 9,
			strokeColor: 'black',
			lineJoin: 'round',
			lineCap: 'round'
		}),

		layer
	]);

	//Create an instance of the drawing manager and display the line drawing option of the drawing toolbar.
	drawingManager = new atlas.drawing.DrawingManager(map, {
		toolbar: new atlas.control.DrawingToolbar({
			buttons: ['draw-line'],
			position: 'top-left',
			style: 'light'
		})
	});

	///Clear the map and drawing canvas when the user enters into a drawing mode.
	map.events.add('drawingmodechanged', drawingManager, drawingModeChanged);

	//Monitor for when a line drawing has been completed.
	map.events.add('drawingcomplete', drawingManager, getElevations);
});

function drawingModeChanged(mode) {
	//Clear the drawing canvas and data source.
	if (mode.startsWith('draw')) {
		drawingManager.getSource().clear();
		datasource.clear();
	}
}

function getElevations(line) {
	//Exit drawing mode and clear the drawing canvas.
	drawingManager.setOptions({ mode: 'idle' });
	drawingManager.getSource().clear();

	//Get the coordinates from the drawn line.
	var lineCoords = line.getCoordinates();

	//Round coordinates to 6 decimal places (~10cm accuracy) to reduce the length of URLs.
	lineCoords.forEach(c => {
		c[0] = Math.round(c[0] * 1000000) / 1000000;
		c[1] = Math.round(c[1] * 1000000) / 1000000;
	});

	//Get the total length of the path.
	var totalLength = atlas.math.getLengthOfPath(lineCoords);

	//Format line coordinates as "longitude0,latitude0|longitude1,latitude1|..."
	var lineParam = lineCoords.map(c => c.join(',')).join('|');

	//The elevation dataset has a 24 meter sample spacing. 
	var sampleSize = Math.min(Math.round(totalLength / 24), maxSampleSize);

	var url = elevationLineUrl.replace('{lines}', lineParam).replace('{samples}', sampleSize);	
  
  //Show loading icon.
	document.getElementById('loadingIcon').style.display = '';


	processRequest(url).then(response => {
		if (response.error) {
			alert(response.error.message);
			return;
		}

		//Convert response into array of positions: [longitude, latitude, elevation]
		var points = response.data.map(c => [c.coordinate.longitude, c.coordinate.latitude, c.elevationInMeter]);

		//Generate a data driven style expression for a gradient based on the elevation.
		var exp = calculateElevationGradientExpression(points, totalLength);

		layer.setOptions({ strokeGradient: exp });
		datasource.setShapes([line]);
						
    //Hide loading icon.
    document.getElementById('loadingIcon').style.display = 'none';
	});
}

function calculateElevationGradientExpression(points, totalLength) {
	var exp = [
		'interpolate',  //This will cause the colors from each data point to create a gradient between points.
		['linear'],
		['line-progress']
	];

	//The line progress will be a fraction of the total length of the path,
	//so we can calculate the line progress value of each data point and set the color accordingly.
	var progress = 0;

	for (var i = 0; i < points.length; i++) {
		var elv = points[i][2];

		//Elevation may not be available sometimes. Skip these values.
		if (elv !== 'NaN') {
			//The line progress value is a value between 0 and 1. 
			//Taking the travelled distance and dividing it by the total distance of the path, will give us the line progress value.
			exp.push(progress / totalLength);

			//Add our business logic on how a data point should be colored based on the elevation.

			//Calculate the index in the color array based on the elevation step size.
			var colorIdx = Math.max(0, Math.min(Math.round(elv / elvSteps), colors.length - 1));
			exp.push(colors[colorIdx]);

			if (i < points.length - 1) {
				progress += atlas.math.getDistanceTo(points[i], points[i + 1]);
			}
		}
	}

	return exp;
}

function processRequest(url) {
	return new Promise((resolve, reject) => {
		//Replace the domain placeholder to ensure the same Azure Maps cloud is used throughout the app.
		url = url.replace('{azMapsDomain}', atlas.getDomain());

		//Get the authentication details from the map for use in the request.
		var requestParams = map.authentication.signRequest({ url: url });

		//Transform the request.
		var transform = map.getServiceOptions().tranformRequest;
		if (transform) {
			requestParams = transform(request);
		}

		fetch(requestParams.url, {
			method: 'GET',
			mode: 'cors',
			headers: new Headers(requestParams.headers)
		})
		.then(r => r.json(), e => reject(e))
		.then(r => {
			resolve(r);
		}, e => reject(e));
	});
}

              
            
!
999px

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