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<!DOCTYPE html>
<html>
<head>
<title>Add arrows to end of paths - 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 add arrow icons along a line on the map. " />
<meta name="keywords" content="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() {
//Initialize a map instance.
map = new atlas.Map('myMap', {
center: [-100, 40],
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 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) {
//Use the last coordinate of the line for the point of the end. Calculate the heading from the second last coordinate to the last coordinate.
return new atlas.data.Feature(new atlas.data.Point(l[l.length - 1]), {
heading: atlas.math.getPixelHeading(l[l.length - 2], l[l.length - 1])
});
}
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>Add Arrow along a Path</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>
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