可変ラベルの配置 | Mapbox GL JS | ドキュメント

text-variable-anchorで、優先度の高いラベルがマップ上に残るように位置をシフトできるようにします。

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>可変ラベルの配置</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v2.14.1/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v2.14.1/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<div id="map"></div>
 
<script>
	// TO MAKE THE MAP APPEAR YOU MUST
	// ADD YOUR ACCESS TOKEN FROM
	// https://account.mapbox.com
	mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';
const map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/light-v9',
center: [-77.04, 38.907],
zoom: 11.15
});
 
// This GeoJSON contains features that include an "icon"
// property. The value of the "icon" property corresponds
// to an image in the Mapbox Light style's sprite.
const places = {
'type': 'FeatureCollection',
'features': [
{
'type': 'Feature',
'properties': {
'description': "Ford's Theater",
'icon': 'theatre-15'
},
'geometry': {
'type': 'Point',
'coordinates': [-77.038659, 38.931567]
}
},
{
'type': 'Feature',
'properties': {
'description': 'The Gaslight',
'icon': 'theatre-15'
},
'geometry': {
'type': 'Point',
'coordinates': [-77.003168, 38.894651]
}
},
{
'type': 'Feature',
'properties': {
'description': "Horrible Harry's",
'icon': 'bar-15'
},
'geometry': {
'type': 'Point',
'coordinates': [-77.090372, 38.881189]
}
},
{
'type': 'Feature',
'properties': {
'description': 'Bike Party',
'icon': 'bicycle-15'
},
'geometry': {
'type': 'Point',
'coordinates': [-77.052477, 38.943951]
}
},
{
'type': 'Feature',
'properties': {
'description': 'Rockabilly Rockstars',
'icon': 'music-15'
},
'geometry': {
'type': 'Point',
'coordinates': [-77.031706, 38.914581]
}
},
{
'type': 'Feature',
'properties': {
'description': 'District Drum Tribe',
'icon': 'music-15'
},
'geometry': {
'type': 'Point',
'coordinates': [-77.020945, 38.878241]
}
},
{
'type': 'Feature',
'properties': {
'description': 'Motown Memories',
'icon': 'music-15'
},
'geometry': {
'type': 'Point',
'coordinates': [-77.007481, 38.876516]
}
}
]
};
 
map.on('load', () => {
// Add a GeoJSON source containing place coordinates and information.
map.addSource('places', {
'type': 'geojson',
'data': places
});
 
map.addLayer({
'id': 'poi-labels',
'type': 'symbol',
'source': 'places',
'layout': {
'text-field': ['get', 'description'],
'text-variable-anchor': ['top', 'bottom', 'left', 'right'],
'text-radial-offset': 0.5,
'text-justify': 'auto',
'icon-image': ['get', 'icon']
}
});
 
map.rotateTo(180, { duration: 10000 });
});
</script>
 
</body>
</html>