Samples/Contour Layer/Circles/Circles.html

﻿<!DOCTYPE html>
<html lang="en">
<head>
    <title>Circles - Bing Maps 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="Calculate the locations for a regular polygon that has 36 locations which will rssult in an approximate circle." />
    <meta name="keywords" content="Microsoft maps, map, gis, API, SDK, Bing, Bing Maps" />
    <meta name="author" content="Microsoft Bing Maps" />
    <meta name="screenshot" content="screenshot.jpg" />
    
    <script>
    var map; 

    function GetMap() {
        map = new Microsoft.Maps.Map('#myMap', {});

        //Load the Spatial Math module.
        Microsoft.Maps.loadModule(['Microsoft.Maps.SpatialMath', 'Microsoft.Maps.Contour'], function () {
            var center = map.getCenter();

            var circle1 = createCircle(center, 1, 'rgba(0,0,150,0.5)');
            var circle2 = createCircle(center, 2, 'rgba(0,0,200,0.5)');
            var circle3 = createCircle(center, 3, 'rgba(0,50,200,0.5)');
            var circle4 = createCircle(center, 4, 'rgba(0,100,200,0.5)');
            var circle5 = createCircle(center, 5, 'rgba(0,150,200,0.5)');

            var layer = new Microsoft.Maps.ContourLayer([circle1, circle2, circle3, circle4, circle5], {
                colorCallback: function (val) {
                    return val;
                },
                polygonOptions: {
                    strokeThickness: 0
                }
            });
            map.layers.insert(layer);
        });
    }

    function createCircle(center, radius, color) {
        //Calculate the locations for a regular polygon that has 36 locations which will rssult in an approximate circle.
        var locs = Microsoft.Maps.SpatialMath.getRegularPolygon(center, radius, 36, Microsoft.Maps.SpatialMath.DistanceUnits.Miles);

        return new Microsoft.Maps.ContourLine(locs, color);
    }
    </script>
    
</head>
<body>
    <div id="myMap" style="position:relative;width:100%;min-width:290px;height:600px;background-color:gray"></div>

    <script>
        // Dynamic load the Bing Maps Key and Script
        // Get your own Bing Maps key at https://www.microsoft.com/maps
        (async () => {
            let script = document.createElement("script");
            let bingKey = await fetch("https://samples.azuremaps.com/api/GetBingMapsKey").then(r => r.text()).then(key => { return key });
            script.setAttribute("src", `https://www.bing.com/api/maps/mapcontrol?callback=GetMap&key=${bingKey}`);
            document.body.appendChild(script);
        })();
    </script>
</body>
</html>