This is a somewhat hacky way of producing rounded labels in Mapbox-GL-JS. They are drawn as Markers, using queryRenderedFeatures to synchronise with the source data.
Created
June 26, 2018 01:28
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Round labels demo
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset='utf-8' /> | |
| <title>Display a map</title> | |
| <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' /> | |
| <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.46.0/mapbox-gl.js'></script> | |
| <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.46.0/mapbox-gl.css' rel='stylesheet' /> | |
| <style> | |
| body { margin:0; padding:0; } | |
| .rounded-label { | |
| background: white; | |
| padding: 0.25em 0.5em; | |
| font-size: 16pt; | |
| border-radius: 1em; | |
| border:1px solid lightgrey; | |
| } | |
| #map { position:absolute; top:0; bottom:0; width:100%; } | |
| </style> | |
| </head> | |
| <body> | |
| <div id='map'></div> | |
| <script> | |
| function loadMarkers() { | |
| // places = map.querySourceFeatures('composite', { sourceLayer: 'place_label', filter: ['<=', 'localrank', 3]}); | |
| places = map.queryRenderedFeatures({ layers: labelLayers}); | |
| console.log(places[0]); | |
| var newies = 0; | |
| places.forEach(place => { | |
| if (!markers[place.id]) { | |
| var el = document.createElement('div'); | |
| el.innerHTML = place.properties.name; | |
| el.className = 'rounded-label'; | |
| markers[place.id] = new mapboxgl.Marker(el) | |
| .setLngLat(place.geometry.coordinates) | |
| .addTo(map); | |
| newies ++; | |
| } | |
| }); | |
| // newies && | |
| console.log(newies, ' markers added.'); | |
| } | |
| mapboxgl.accessToken = 'pk.eyJ1Ijoic3RldmFnZSIsImEiOiJGcW03aExzIn0.QUkUmTGIO3gGt83HiRIjQw'; | |
| var map = new mapboxgl.Map({ | |
| container: 'map', | |
| style: 'mapbox://styles/mapbox/streets-v9', | |
| center: [-74.50, 40], | |
| zoom: 9 | |
| }); | |
| var places; | |
| var markers = {}; | |
| var labelLayers = ['place-city-lg-n', 'place-city-lg-s', 'place-city-md-n', 'place-city-md-s', 'place-city-sm']; | |
| // map.on('load', () => labelLayers.forEach(l => map.setPaintProperty(l, 'text-opacity', 0.1))); | |
| map.on('sourcedata', loadMarkers); | |
| // there seems to be an unmanageable race condition here. | |
| map.once('render', () => window.setTimeout(loadMarkers, 2000)); | |
| </script> | |
| </body> | |
| </html> |
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