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<!DOCTYPE html>
<html>
<head>
<title>Merge Two Polygons Together - 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 merge (union) two polygons together to create a single polygon object." />
<meta name="keywords" content="map, gis, API, SDK, Turf.js, geospatial, math, spatial math, polygons, merge, union, spatial analytics" />
<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>
<!-- Load turf.js a spatial math library. http://turfjs.org/ -->
<script src='https://npmcdn.com/@turf/turf/turf.min.js'></script>
<script type='text/javascript'>
var map, datasource;
function GetMap() {
//Initialize a map instance.
map = new atlas.Map('myMap', {
center: [-82.55, 35.59],
zoom: 12,
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 two overlapping polygons. For demo purposes we give them a isUnion property set to false so we can use a single data source for all the data and use filters with layers.
var poly1 = new atlas.data.Feature(new atlas.data.Polygon([[
[-82.574787, 35.594087],
[-82.574787, 35.615581],
[-82.545261, 35.615581],
[-82.545261, 35.594087],
[-82.574787, 35.594087]
]]), {
isUnion: false
});
var poly2 = new atlas.data.Feature(new atlas.data.Polygon([[
[-82.560024, 35.585153],
[-82.560024, 35.602602],
[-82.52964, 35.602602],
[-82.52964, 35.585153],
[-82.560024, 35.585153]
]]), {
isUnion: false
});
//Calculate the union of the two polygons and give it a isUion property set to true.
var union = turf.union(poly1, poly2);
union.properties = {
isUnion: true
};
//Create a data source and add it to the map.
datasource = new atlas.source.DataSource();
map.sources.add(datasource);
//Add the polygons to the data source.
datasource.add([poly1, poly2, union]);
map.layers.add([
//Add a polygon layer to render the two input polygons.
new atlas.layer.PolygonLayer(datasource, null, {
fillColor: 'rgba(0,155, 255,0.2)',
filter: ['==', ['get', 'isUnion'], false]
}),
//Add a LineLayer to outline the two polygons in black.
new atlas.layer.LineLayer(datasource, null, {
strokeColor: 'black',
filter: ['==', ['get', 'isUnion'], false]
}),
//Add a LineLayer to outline the union of the two polygons in red.
new atlas.layer.LineLayer(datasource, null, {
strokeColor: 'red',
strokeWidth: 2,
filter: ['==', ['get', 'isUnion'], true]
}),
]);
});
}
</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>Merge Two Polygons Together</legend>
This sample shows how to merge (union) two polygons together to create a single polygon object.
To accomplish this, this sample uses the open source <a href="http://turfjs.org/" target="_blank">Turf.js</a> library.
</fieldset>
</body>
</html>
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