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<!DOCTYPE html>
<html lang="en">
<head>
<title>Add arrows to end of paths - 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 add arrow icons along a line on the map. " />
<meta name="keywords" content="Microsoft maps, map, gis, API, SDK, linestring, arrows, path, symbols, linelayer" />
<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;
//Sample line data.
var lineData = [
new atlas.data.LineString([[-70.13671, 37.23032], [-74.09179, 40.71395]]),
new atlas.data.LineString([[-73.91601, 28.99853], [-80.59570, 24.36711], [-88.33007, 24.44714], [-95.00976, 29.30556]]),
new atlas.data.LineString([[-156.00585, 20.79720], [-142.38281, 20.46818], [-127.00195, 31.65338], [-118.82812, 33.65120]]),
new atlas.data.LineString([[-136.49414, 57.23150], [-143.17382, 53.80065], [-130.78125, 46.31658], [-124.27734, 46.07323]])
];
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: [-100, 40],
zoom: 3,
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 an arrow icon from one of the built-in templates
map.imageSprite.createFromTemplate('arrow-icon', 'triangle-arrow-up', 'DarkOrchid', 'DarkOrchid').then(function () {
//Create a data source to add your data to.
datasource = new atlas.source.DataSource();
map.sources.add(datasource);
//Add line data to the data source.
datasource.add(lineData);
//Calculate the end points of the lines and add them to the data source.
datasource.add(calculateLineEndPoints(lineData));
//Add a layers for rendering data.
map.layers.add([
//Add a line layer for displaying the line.
new atlas.layer.LineLayer(datasource, null, {
strokeColor: 'DarkOrchid',
strokeWidth: 3
}),
//Add a symbol layer for rendering the arrow along the line.
new atlas.layer.SymbolLayer(datasource, null, {
iconOptions: {
image: 'arrow-icon', //Reference the custom created icon.
allowOverlap: true, //Allow icons to overlay.
anchor: 'top', //Want the top of the image to align with the end of the line.
rotationAlignment: 'map', //Lock icon rotation to the map.
rotation: ['get', 'heading'], //Rotate the icon based on the heading property of each data point.
size: 0.7 //Scale the size of the icon.
},
filter: ['==', ['geometry-type'], 'Point'] //Only render point data in this layer and not the coordinates of lines.
})
]);
});
});
}
function calculateLineEndPoints(lines) {
var points = [];
for (var i = 0; i < lines.length; i++) {
var p = calculateLineEndPoint(lines[i]);
if (p) {
points.push(p);
}
}
return points;
}
function calculateLineEndPoint(line) {
var l = null;
if (line instanceof atlas.Shape) {
l = line.getCoordinates();
} else if (line.type === 'Feature') {
l = line.geometry.coordinates;
} else if (line.type === 'LineString') {
l = line.coordinates;
}
if (l && l.length >= 2) {
//Calculate the heading from the second last coordinate to the last coordinate.
//Since we want them to be pixel accurate rather than spatialy accurate, convert them to pixels (any zoom level will do but 20 will likely be more than accurate enough) and get the pixel heading.
var pixels = atlas.math.mercatorPositionsToPixels([l[l.length - 2], l[l.length - 1]], 20);
var heading = atlas.Pixel.getHeading(pixels[0], pixels[1]);
//Use the last coordinate of the line for the point of the end.
return new atlas.data.Feature(new atlas.data.Point(l[l.length - 1]), {
heading: heading
});
}
return null;
}
</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><h1 style="font-size:16px">Add Arrow along a Path</h1></legend>
This sample shows how to add arrow icons along a line on the map.
When using a symbol layer, set the "placement" option to "line", this will render the symbols along the line and rotate the icons (0 degrees = right).
</fieldset>
</body>
</html>