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<!DOCTYPE html>
<html>
<head>
<title>Get closest point to geometry - 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 get the closest point on a geometry from another point or position."/>
<meta name="keywords" content="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() {
//Initialize a map instance.
map = new atlas.Map('myMap', {
center: [-122.32, 47.6],
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 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>Get closest point to geometry</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>
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