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AzureMapsGovCloudCodeSamples/AzureMapsCodeSamples/Spatial Math/Get closest point to geometry.html
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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 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 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" /> | |
<!-- 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, sampleLine, dragMarker, snapMarker, shortestLine; | |
function GetMap() { | |
//Point the Azure Maps domain to the US Azure Gov Cloud domain. | |
atlas.setDomain('atlas.azure.us'); | |
//Initialize a map instance. | |
map = new atlas.Map('myMap', { | |
center: [-122.32, 47.6], | |
zoom: 12, | |
view: 'Auto', | |
//Add authentication details for connecting to Azure Maps. | |
authOptions: { | |
//Use Azure Active Directory authentication. | |
authType: 'anonymous', | |
clientId: 'c9f2f391-13f1-407b-a4a5-f0a241bacfbf', //Your Azure Active Directory client id for accessing your Azure Maps account. | |
getToken: function (resolve, reject, map) { | |
//URL to your authentication service that retrieves an Azure Active Directory Token. | |
var tokenServiceUrl = 'https://azuremapscodesamples.azurewebsites.us/Common/TokenService.ashx'; | |
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><h1 style="font-size:16px">Get closest point to geometry</h1></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> |