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<!DOCTYPE html>
<html>
<head>
<title>Line with Stroke Gradient - 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 apply a stroke gradient to a line on the map." />
<meta name="keywords" content="map, gis, API, SDK, line, linestring, polyline, layer, stroke gradient, gradient, 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;
function GetMap() {
//Initialize a map instance.
map = new atlas.Map('myMap', {
center: [-122.135, 47.65],
zoom: 12,
style: 'grayscale_dark',
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(null, {
lineMetrics: true //Enable line metrics on the data source. This is needed to enable support for strokeGradient.
});
map.sources.add(datasource);
//Create a line and add it to the data source.
datasource.add(new atlas.data.Feature(new atlas.data.LineString([
[-122.18822, 47.63208],
[-122.18204, 47.63196],
[-122.17243, 47.62976],
[-122.16419, 47.63023],
[-122.15852, 47.62942],
[-122.15183, 47.62988],
[-122.14256, 47.63451],
[-122.13483, 47.64041],
[-122.13466, 47.64422],
[-122.13844, 47.65440],
[-122.13277, 47.66515],
[-122.12779, 47.66712],
[-122.11595, 47.66712],
[-122.11063, 47.66735],
[-122.10668, 47.67035],
[-122.10565, 47.67498]
])));
//Create a line layer and pass in a gradient expression for the strokeGradient property.
map.layers.add(new atlas.layer.LineLayer(datasource, null, {
strokeWidth: 6,
strokeGradient: [
'interpolate',
['linear'],
['line-progress'],
0, "blue",
0.1, "royalblue",
0.3, "cyan",
0.5, "lime",
0.7, "yellow",
1, "red"
]
}));
});
}
</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>Line with Stroke Gradient</legend>
This sample shows how to apply a stroke gradient to a line on the map.
In order to apply this feature to a line, the data source must have the lineMetrics option set to true.
</fieldset>
</body>
</html>
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