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Snap drawn line to roads.html
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Snap drawn line to roads.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>Snap drawn line to roads - Azure Maps Web SDK Samples</title>
<meta charset="utf-8" />
<link rel="shortcut icon" href="/favicon.ico" />
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
<meta name="description" content=" This sample shows how to snap a line drawn using the drawing tools to the road network. " />
<meta name="keywords" content="Microsoft maps, map, gis, API, SDK, services, module, route, directions, snap to roads, snapping, gps traces, gps trace, snap to road" />
<meta name="author" content="Microsoft Azure Maps" />
<meta name="version" content="2.0" />
<meta name="screenshot" content="screenshot.jpg" />
<!-- Add references to the Azure Maps Map control JavaScript and CSS files. -->
<link href="https://atlas.microsoft.com/sdk/javascript/mapcontrol/3/atlas.min.css" rel="stylesheet" />
<script src="https://atlas.microsoft.com/sdk/javascript/mapcontrol/3/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/1/atlas-drawing.min.css" type="text/css" />
<script src="https://atlas.microsoft.com/sdk/javascript/drawing/1/atlas-drawing.min.js"></script>
<!-- Add a reference to the Azure Maps Rest Helper JavaScript file. -->
<script src="https://samples.azuremaps.com/lib/azure-maps/azure-maps-helper.min.js"></script>
<script>
// Define the variables used to store the map, data source, and drawing manager.
var map, datasource, drawingManager;
// Your Azure Maps client id for accessing your Azure Maps account.
var azureMapsClientId = 'e6b6ab59-eb5d-4d25-aa57-581135b927f0';
// URL to your authentication service that retrieves an Microsoft Entra ID Token.
var tokenServiceUrl = 'https://samples.azuremaps.com/api/GetAzureMapsToken';
// URL to the Azure Maps route direction service.
var routeUrl = 'https://{azMapsDomain}/route/directions/json?api-version=1.0&query={query}';
// Function to retrieve an Azure Maps access token.
function getToken(resolve, reject, map) {
fetch(tokenServiceUrl).then(response => {
if (response.ok) {
return response.text();
}
throw new Error('Failed to retrieve Azure Maps token.');
}).then(token => resolve(token)).catch(error => reject(error));
}
function getMap() {
// Initialize a map instance.
map = new atlas.Map('myMap', {
center: [-122.335, 47.608],
zoom: 15,
view: 'Auto',
// Add authentication details for connecting to Azure Maps.
authOptions: {
// Use Microsoft Entra ID authentication.
authType: 'anonymous',
clientId: azureMapsClientId,
getToken: getToken
// Alternatively, use an Azure Maps key.
// Get an Azure Maps key at https://azure.com/maps.
// NOTE: The primary key should be used as the key.
//authType: 'subscriptionKey',
//subscriptionKey: '[YOUR_AZURE_MAPS_KEY]'
}
});
// Wait until the map resources are ready.
map.events.add('ready', function () {
// Create a data source for the route line.
datasource = new atlas.source.DataSource();
map.sources.add(datasource);
// Create a layer for rendering the route line under the road labels.
map.layers.add(new atlas.layer.LineLayer(datasource, null, {
strokeWidth: 5,
lineJoin: 'round',
lineCap: 'round'
}), 'labels');
// 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, snapLineToRoute);
});
}
function drawingModeChanged(mode) {
// Clear the drawing canvas and data source.
if (mode.startsWith('draw')) {
drawingManager.getSource().clear();
datasource.clear();
}
}
function snapLineToRoute(line) {
// Exit drawing mode.
drawingManager.setOptions({ mode: 'idle' });
// Get the coordinates from the drawn line.
var lineCoords = line.getCoordinates();
var query = lineCoords.map(coord => `${coord[1]},${coord[0]}`).join(':');
// Calculate a route.
var routeRequestUrl = routeUrl
.replace('{query}', encodeURIComponent(query));
processRequest(routeRequestUrl).then(directions => {
// Extract the first route from the directions.
const route = directions.routes[0];
// Combine all leg coordinates into a single array.
const routeCoordinates = route.legs.flatMap(leg => leg.points.map(point => [point.longitude, point.latitude]));
// Create a LineString from the route path points.
const routeLine = new atlas.data.LineString(routeCoordinates);
// Add it to the data source.
datasource.add(routeLine);
});
}
</script>
</head>
<body onload="getMap()">
<div id="myMap" style="position:relative;width:100%;min-width:290px;height:600px;"></div>
<fieldset style="width:calc(100% - 30px);min-width:290px;margin-top:10px;">
<legend>Snap drawn line to roads</legend>
This sample shows how to snap a line drawn using the drawing tools to the road network.
To run this sample, press the line drawing button in the top corner of the map and draw a line near roads.
When you complete the drawing (double click, press ESC, or press the line drawing button again),
the Azure Maps route direction service will be used to calculate logical route path on the road network following the drawn line.
The black line is the original drawn line and the blue line is the snapped line on the road network.
</fieldset>
</body>
</html>