AzureMapsCodeSamples/Samples/Spatial Math/Filter Data Along Route/Filter Data Along Route.html at main · Azure-Samples/AzureMapsCodeSamples · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <title>Filter Data Along Route - 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 take a route line, calculate a buffer around it and then filter a set of points to find those that are within the buffer." />
    <meta name="keywords" content="Microsoft maps, map, gis, API, SDK, Turf.js, geospatial, math, points, buffer, within, intersects, intersection" />
    <meta name="author" content="Microsoft Azure Maps" />
    <meta name="version" content="1.0" />
    <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 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>

    <!-- Load turf.js a spatial math library. https://turfjs.org/ -->
    <script src='/lib/turf.min.js'></script>

    <script>
        var map, points, datasource, routeLine;

        // URL for the Azure Maps Route API.
        var routeUrl = 'https://{azMapsDomain}/route/directions/json?api-version=1.0&query={query}&maxAlternatives=0&instructionsType=text&traffic=true';

        // URL for the Azure Maps Search Geocoder API.
        var geocodeUrl = 'https://{azMapsDomain}/search/address/json?api-version=1.0&query={query}&limit=1';

        function getMap() {
            // Initialize a map instance.
            map = new atlas.Map('myMap', {
                center: [-122.25, 47.64],
                zoom: 11,
                view: 'Auto',
                language: 'Auto',

                // Add authentication details for connecting to Azure Maps.
                authOptions: {
                    // Use SAS token for authentication
                    authType: 'sas',
                    getToken: function (resolve, reject, map) {
                        // URL to your authentication service that retrieves a SAS Token
                        var tokenServiceUrl = 'https://samples.azuremaps.com/api/GetAzureMapsSasToken';

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

                    // 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 and add it to the map.
                datasource = new atlas.source.DataSource();
                map.sources.add(datasource);

                //Generate 1000 random points within the bounds of the map view using the Turf.js library
                points = turf.randomPoint(1000, {
                    bbox: map.getCamera().bounds
                });

                //Assign a color property to each point.
                for (var i = 0; i < points.features.length; i++) {
                    points.features[i].properties.color = '#3399ff';
                }

                datasource.add(points);

                map.layers.add([
                    //Add a layer for rendering line data.
                    new atlas.layer.PolygonLayer(datasource, null, {
                        fillColor: 'rgba(255, 0, 255, 0.4)',
                        filter: ['any', ['==', ['geometry-type'], 'Polygon'], ['==', ['geometry-type'], 'MultiPolygon']]	//Only render Polygon or MultiPolygon in this layer.
                    }),

                    //Add a layer for rendering line data.
                    new atlas.layer.LineLayer(datasource, null, {
                        strokeColor: 'rgb(0, 204, 153)',
                        strokeWidth: 5,
                        filter: ['any', ['==', ['geometry-type'], 'LineString'], ['==', ['geometry-type'], 'MultiLineString']]	//Only render LineString or MultiLineString in this layer.
                    }),

                    //Add a layer for rendering points as symbols.
                    new atlas.layer.BubbleLayer(datasource, null, {
                        createIndicators: true, // to enable bubble layer a11y feature
                        color: ['get', 'color'],
                        filter: ['any', ['==', ['geometry-type'], 'Point'], ['==', ['geometry-type'], 'MultiPoint']] //Only render Point or MultiPoints in this layer.
                    })
                ]);
            });
        }

        function calculateRoute() {
            var start = document.getElementById('startTbx').value;
            var end = document.getElementById('endTbx').value;

            if (start == '' || end == '') {
                alert('Invalid waypoint point specified.');
                return;
            }

            //Geocode the start waypoint.
            geocodeQuery(start, function (startPoint) {
                if (!startPoint) {
                    alert('Unable to geocode start waypoint.');
                    return;
                }

                //Geocode the end waypoint.
                geocodeQuery(end, function (endPoint) {
                    if (!endPoint) {
                        alert('Unable to geocode end waypoint.');
                        return;
                    }

                    var routeRequestURL = routeUrl
                        .replace('{query}', `${startPoint.lat},${startPoint.lon}:${endPoint.lat},${endPoint.lon}`);

                    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.
                        routeLine = new atlas.data.LineString(routeCoordinates);

                        // Add it to the data source.
                        datasource.add(routeLine);

                        //Have the map focus on the route.
                        map.setCamera({
                            bounds: atlas.data.BoundingBox.fromData(routeLine),
                            padding: 40
                        });

                        filterData();

                    });
                    //
                });
            });
        }

        function filterData() {
            if (routeLine) {
                var bufferDistance = parseFloat(document.getElementById('bufferDistance').value);

                //Create a polygon search area by buffering the route line.
                filterArea = turf.buffer(routeLine, bufferDistance, { units: 'miles' });

                //Reset the color property of each point.
                for (var i = 0; i < points.features.length; i++) {
                    points.features[i].properties.color = '#3399ff';
                }

                //Calculate all points that are within the filter area.
                var ptsWithin = turf.pointsWithinPolygon(points, filterArea);

                //Change to color of all points that are in the filter area to red.
                for (var i = 0; i < ptsWithin.features.length; i++) {
                    ptsWithin.features[i].properties.color = 'red';
                }

                //Update the data on the map.
                datasource.setShapes(points);
                datasource.add([filterArea, routeLine]);
            }
        }

        //Geocode the query and return the first coordinate.
        function geocodeQuery(query, callback) {

            var geocodeRequestUrl = geocodeUrl
                .replace('{query}', encodeURIComponent(query));

            if (callback) {
                processRequest(geocodeRequestUrl).then(geocode => {
                    if (geocode.results.length > 0) {
                        callback(geocode.results[0].position);
                    } else {
                        callback(null);
                    }
                });
            }
        }
    </script>
</head>
<body onload="getMap()">
    <div id="myMap" style="position:relative;width:100%;min-width:290px;height:600px;"></div>

    <div style="position:absolute;top:15px;left:15px;background-color:white;padding:10px;border-radius:10px;">
        <table>
            <tr>
                <td>Start: </td>
                <td><input type="text" id="startTbx" value="Seattle" /></td>
            </tr>
            <tr>
                <td>End: </td>
                <td><input type="text" id="endTbx" value="Redmond" /></td>
            </tr>
            <tr>
                <td></td>
                <td><input type="button" value="Calculate Route" onclick="calculateRoute()" /></td>
            </tr>
            <tr>
                <td>Buffer: </td>
                <td>
                    <form oninput="bd.value=bufferDistance.value">
                        <input type="range" id="bufferDistance" value="1" min="0.1" max="5" step="0.1" onchange="filterData()" />
                        <output name="bd" for="bufferDistance">1</output>
                        <label> miles</label>
                    </form>
                </td>
            </tr>
        </table>
    </div>

    <fieldset style="width:calc(100% - 30px);min-width:290px;margin-top:10px;">
        <legend>Filter Data Along Route</legend>
        This sample shows how to take a route line and calculate a buffer around it and then filter a set of point data to find those that are within the buffer.
        This sample uses the open source
        <a href="https://turfjs.org/" target="_blank">Turf.js</a> library to for some of the spatial calculation.
    </fieldset>
</body>
</html>