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Use draw plugin and Turf.js to add white mask around drawn polygon
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8" /> | |
| <title>Show drawn polygon area</title> | |
| <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" /> | |
| <script src="https://api.mapbox.com/mapbox-gl-js/v2.7.0/mapbox-gl.js"></script> | |
| <link href="https://api.mapbox.com/mapbox-gl-js/v2.7.0/mapbox-gl.css" rel="stylesheet" /> | |
| <style> | |
| body { | |
| margin: 0; | |
| padding: 0; | |
| } | |
| #map { | |
| position: absolute; | |
| top: 0; | |
| bottom: 0; | |
| width: 100%; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <style> | |
| .calculation-box { | |
| height: 75px; | |
| width: 150px; | |
| position: absolute; | |
| bottom: 40px; | |
| left: 10px; | |
| background-color: rgba(255, 255, 255, 0.9); | |
| padding: 15px; | |
| text-align: center; | |
| } | |
| p { | |
| font-family: 'Open Sans'; | |
| margin: 0; | |
| font-size: 13px; | |
| } | |
| </style> | |
| <script src="https://cdn.jsdelivr.net/npm/@turf/turf@5/turf.min.js"></script> | |
| <script src="https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-draw/v1.2.0/mapbox-gl-draw.js"></script> | |
| <link rel="stylesheet" href="https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-draw/v1.2.0/mapbox-gl-draw.css" | |
| type="text/css" /> | |
| <div id="map"></div> | |
| <script> | |
| mapboxgl.accessToken = 'pk.eyJ1IjoibWFsLXdvb2QiLCJhIjoiY2oyZ2t2em50MDAyMzJ3cnltMDFhb2NzdiJ9.X-D4Wvo5E5QxeP7K_I3O8w'; | |
| var map = new mapboxgl.Map({ | |
| container: 'map', // container id | |
| style: 'mapbox://styles/mapbox/satellite-v9', //hosted style id | |
| center: [-91.874, 42.76], // starting position | |
| zoom: 12 // starting zoom | |
| }); | |
| var draw = new MapboxDraw({ | |
| displayControlsDefault: false, | |
| controls: { | |
| polygon: true, | |
| trash: true | |
| } | |
| }); | |
| map.addControl(draw); | |
| map.on('draw.create', updateArea); | |
| map.on('draw.delete', removeMask); | |
| //map.on('draw.update', updateArea); | |
| function updateArea(e) { | |
| var data = draw.getAll(); | |
| if (data.features.length > 0) { | |
| var masked = turf.mask(data); | |
| map.addSource('mask-source', { | |
| 'type': 'geojson', | |
| 'data': masked | |
| } | |
| ); | |
| map.addLayer({ | |
| 'id': 'mask', | |
| 'type': 'fill', | |
| 'source': 'mask-source', | |
| 'layout': {}, | |
| 'paint': { | |
| 'fill-color': '#fff' | |
| } | |
| }); | |
| } | |
| } | |
| function removeMask(e) { | |
| if (map.getLayer('mask')) map.removeLayer('mask'); | |
| if (map.getSource('mask-source')) map.removeSource('mask-source'); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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