AzureMapsCodeSamples/Samples/Spatial Math/Get closest point to geometry/Get closest point to geometry.html at main · Azure-Samples/AzureMapsCodeSamples · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <title>Get closest point to geometry - 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 get the closest point on a geometry from another point or position."/>
    <meta name="keywords" content="Microsoft maps, map, gis, API, SDK, geospatial, spatial math, math" />
    <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>

    <script>
        var map, datasource, sampleLine, dragMarker, snapMarker, shortestLine;

        function getMap() {
            //Initialize a map instance.
            map = new atlas.Map('myMap', {
                center: [-122.32, 47.6],
                zoom: 12,
                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);

                //Create a sample line to snap to and add it to the data source.
                sampleLine = new atlas.data.LineString([
                    [-122.3682, 47.6364], [-122.3458, 47.6148], [-122.3116, 47.6200], [-122.3188, 47.6099],
                    [-122.3408, 47.6041], [-122.3274, 47.6271], [-122.2800, 47.6193], [-122.3111, 47.5903],
                    [-122.3399, 47.5799], [-122.2900, 47.5781], [-122.2975, 47.5985], [-122.2742, 47.6072]]);

                datasource.add(new atlas.data.Feature(sampleLine, {
                    color: 'blue'
                }));

                //Create a layer to render line data and add it to the map.
                map.layers.add(new atlas.layer.LineLayer(datasource, null, {
                    strokeColor: ['get', 'color'],
                    strokeWidth: 3
                }));

                //Create a red snap marker to show the point on the geometry.
                snapMarker = new atlas.HtmlMarker({
                    position: map.getCamera().center,
                    color: 'red'
                });
                map.markers.add(snapMarker);

                //Create a green drag marker to be the point neat a geometry.
                dragMarker = new atlas.HtmlMarker({
                    position: map.getCamera().center,
                    draggable: true,
                    color: 'green'
                });
                map.markers.add(dragMarker);

                //Add a drag event to the marker.
                map.events.add('drag', dragMarker, getClosestPoint);

                //Calculate the closest point.
                getClosestPoint();
            });
        }

        function getClosestPoint() {
            //Calculate the closest point on the geometry.
            var p = atlas.math.getClosestPointOnGeometry(dragMarker.getOptions().position, sampleLine);

            if (p) {
                //Update the position of the red snap marker.
                snapMarker.setOptions({ position: p.geometry.coordinates });

                //Create a line to show the shortest path between the green drag marker and the red snap marker.
                var path = [dragMarker.getOptions().position, p.geometry.coordinates];

                if (!shortestLine) {
                    shortestLine = new atlas.Shape(new atlas.data.LineString(path), null, {
                        color: 'red'
                    });
                    datasource.add(shortestLine);
                } else {
                    shortestLine.setCoordinates(path);
                }

                //Display the distance between the two markers.
                document.getElementById('distancePanel').innerText = 'Distance: ' + p.properties.distance + 'm';
            }
        }
    </script>
</head>
<body onload="getMap()">
    <div id="myMap" style="position:relative;width:100%;min-width:290px;height:600px;"></div>

    <div id="distancePanel" style="position:absolute;top:10px;left:10px;background-color:#fff;padding:10px;border-radius:20px;"></div>

    <fieldset style="width:calc(100% - 30px);min-width:290px;margin-top:10px;">
        <legend>Get closest point to geometry</legend>
        This sample shows how to get the closest point on a geometry from another point or position.
        Drag the green marker to see the calculation update.
    </fieldset>
</body>
</html>