Examples
Layers (31)
Display buildings in 3DAdd a 3D modelExtrude polygons for 3D indoor mappingAdjust a layer's opacityAnimate a lineAnimate a series of imagesAnimate a pointChange building color based on zoom levelChange the case of labelsDisplay HTML clusters with custom propertiesCreate and style clustersChange a layer's color with buttonsAdd a custom style layerStyle lines with a data-driven propertyStyle circles with a data-driven propertyDisplay and style rich text labelsAdd a pattern to a polygonAdd a new layer below labelsAdd a GeoJSON lineDraw GeoJSON pointsAdd a GeoJSON polygonCreate a heatmap layerCreate a gradient line using an expressionAdd multiple geometries from one GeoJSON sourceStyle ocean depth dataShow and hide layersUpdate a choropleth layer by zoom levelChange worldview of administrative boundariesVariable label placementVisualize population densityAdd hillshading

Create a gradient line using an expression

Use the line-gradient paint property and an expression to visualize distance from the starting point of a line.

Mapbox GL unsupported
Mapbox GL requires WebGL support. Please check that you are using a supported browser and that WebGL is enabled.
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8' />
<title>Create a gradient line using an expression</title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.54.0/mapbox-gl.js'></script>
<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.54.0/mapbox-gl.css' rel='stylesheet' />
<style>
body { margin:0; padding:0; }
#map { position:absolute; top:0; bottom:0; width:100%; }
</style>
</head>
<body>
<div id='map'></div>
<script>
mapboxgl.accessToken = '<your access token here>';
var map = window.map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/light-v10',
center: [-77.035, 38.875],
zoom: 12,
});
var geojson = {
"type": "FeatureCollection",
"features": [{
"type": "Feature",
"properties": {},
"geometry": {
"coordinates": [
[-77.044211, 38.852924 ],
[-77.045659, 38.860158 ],
[-77.044232, 38.862326 ],
[-77.040879, 38.865454 ],
[-77.039936, 38.867698 ],
[-77.040338, 38.86943 ],
[-77.04264, 38.872528 ],
[-77.03696, 38.878424 ],
[-77.032309, 38.87937 ],
[-77.030056, 38.880945 ],
[-77.027645, 38.881779 ],
[-77.026946, 38.882645 ],
[-77.026942, 38.885502 ],
[-77.028054, 38.887449 ],
[-77.02806, 38.892088 ],
[-77.03364, 38.892108 ],
[-77.033643, 38.899926 ]
],
"type": "LineString"
}
}]
};
map.on('load', function () {
// 'line-gradient' can only be used with GeoJSON sources
// and the source must have the 'lineMetrics' option set to true
map.addSource('line', {
type: 'geojson',
lineMetrics: true,
data: geojson
});
// the layer must be of type 'line'
map.addLayer({
type: 'line',
source: 'line',
id: 'line',
paint: {
'line-color': 'red',
'line-width': 14,
// 'line-gradient' must be specified using an expression
// with the special 'line-progress' property
'line-gradient': [
'interpolate',
['linear'],
['line-progress'],
0, "blue",
0.1, "royalblue",
0.3, "cyan",
0.5, "lime",
0.7, "yellow",
1, "red"
]
},
layout: {
'line-cap': 'round',
'line-join': 'round'
}
});
});
</script>
</body>
</html>