AzureMapsCodeSamples/Samples/Polygons/Mercator Projection and Geospatial Circles/Mercator Projection and Geospatial Circles.html at main · Azure-Samples/AzureMapsCodeSamples · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
<!DOCTYPE html>
<html lang="en">
<head>
    <title>Mercator Projection and Geospatial Circles - 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 the Mercator projection of the map affects the scale of geospatially accurate objects on the map." />
    <meta name="keywords" content="Microsoft maps, map, gis, API, SDK, circle, geospatial, mercator, projection" />
    <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;

        function getMap() {
            //Initialize a map instance.
            map = new atlas.Map('myMap', {
                center: [-45, 70],
                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 circles and add to the data source.
                datasource.add([
                    //Create a circle that is 750KM in radius over Brazil.
                    new atlas.data.Feature(new atlas.data.Point([-52, -10]), {
                        subType: "Circle",
                        radius: 750000
                    }),

                    //Create a second circle that is 750KM in radius, but over Greenland.
                    new atlas.data.Feature(new atlas.data.Point([-41, 75]), {
                        subType: "Circle",
                        radius: 750000
                    })
                ]);

                //Create a polygon layer to render the filled in area of the circle polygon, and add it to the map.
                map.layers.add(new atlas.layer.PolygonLayer(datasource, null, {
                    fillColor: 'rgba(255, 140, 0, 0.5)'
                }));
            });
        }
    </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>Mercator Projection and Geospatial Circles</legend>
        This sample shows how the Mercator projection of the map affects the scale of geospatially accurate objects on the map.
        In this sample both circles have a radius of 750KM (750,000 meters). However, the closer the circle is to the North or South pole, the larger and more elliptical it appears.
    </fieldset>
</body>
</html>