Reputation: 570
I need to create a circle around a point where a user clicks. How would I do this? Every tutorial shows extracting a circle from a geojson source and not creating one. Need to be able to edit the radius as well.
Upvotes: 2
Views: 6294
Reputation: 2312
Did you try something yourself? Following the mapbox examples you should be able to get an idea of how to build something like that.
You would need to do 3 things:
This is an example of how I would have coded that: https://jsfiddle.net/andi_lo/495t0dx2/
Hope that helps you out
mapboxgl.accessToken = '####';
var map = new mapboxgl.Map({
container: 'map', // container id
style: 'mapbox://styles/mapbox/light-v9', //stylesheet location
center: [-74.50, 40], // starting position
zoom: 9 // starting zoom
});
map.on('load', () => {
const points = turf.featureCollection([]);
// add data source to hold our data we want to display
map.addSource('circleData', {
type: 'geojson',
data: {
type: 'FeatureCollection',
features: [],
},
});
// add a layer that displays the data
map.addLayer({
id: 'data',
type: 'circle',
source: 'circleData',
paint: {
'circle-color': '#00b7bf',
'circle-radius': 8,
'circle-stroke-width': 1,
'circle-stroke-color': '#333',
},
});
// on user click, extract the latitude / longitude, update our data source and display it on our map
map.on('click', (clickEvent) => {
const lngLat = new Array(clickEvent.lngLat.lng, clickEvent.lngLat.lat);
points.features.push(turf.point(lngLat));
map.getSource('circleData').setData(points);
});
});
#map {
height: 500px;
}
<div id="map"></div>
Upvotes: 5