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<!DOCTYPE html>
<html>
<head>
<title>Calculate a convex hull - Azure Maps Web SDK Samples</title>
<meta charset="utf-8" />
<meta http-equiv="x-ua-compatible" content="IE=Edge" />
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
<meta name="description" content="This sample shows how to calculate a convex hull from an array of shapes." />
<meta name="keywords" content="map, gis, API, SDK, geospatial, spatial math, math, convex hull" />
<meta name="author" content="Microsoft Azure Maps" />
<!-- Add references to the Azure Maps Map control JavaScript and CSS files. -->
<link rel="stylesheet" href="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.css" type="text/css" />
<script src="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.js"></script>
<script type='text/javascript'>
var map, datasource;
function GetMap() {
//Initialize a map instance.
map = new atlas.Map('myMap', {
center: [-90, 35],
zoom: 3,
view: 'Auto',
//Add your Azure Maps subscription key to the map SDK. Get an Azure Maps key at https://azure.com/maps
authOptions: {
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);
updateCoordinates();
//Create a layer to render the convex hull as a polygon and the point data as symbols.
map.layers.add([
new atlas.layer.PolygonLayer(datasource),
new atlas.layer.SymbolLayer(datasource, null, {
iconOptions: {
ignorePlacement: true,
allowOverlap: true
}
})
]);
});
}
function updateCoordinates() {
datasource.clear();
//Generate some random coordinates over the USA.
var shapes = [];
for (var i = 0; i < 15; i++) {
shapes.push(new atlas.data.Point([
Math.random() * 40 - 120,
Math.random() * 20 + 30
]));
}
var hull = atlas.math.getConvexHull(shapes);
shapes.push(hull);
datasource.setShapes(shapes);
}
</script>
</head>
<body onload="GetMap()">
<div id="myMap" style="position:relative;width:100%;min-width:290px;height:600px;"></div>
<input type="button" value="Update Coordinates" onclick="updateCoordinates()" style="position:absolute;top:10px;left:10px;" />
<fieldset style="width:calc(100% - 30px);min-width:290px;margin-top:10px;">
<legend>Calculate a convex hull</legend>
This sample shows how to calculate a convex hull from an array of shapes.
A convex hull is a shape that represents that minimum convex geometry that encloses all shapes in the specified data set.
</fieldset>
</body>
</html>
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