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/v0.53.0/mapbox-gl.js'></script><link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.53.0/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-v9',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 truemap.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>