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Use draw plugin to query for POIs
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8" /> | |
| <title>Draw plugin and qrf </title> | |
| <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" /> | |
| <script src="https://api.mapbox.com/mapbox-gl-js/v2.0.0/mapbox-gl.js"></script> | |
| <link href="https://api.mapbox.com/mapbox-gl-js/v2.0.0/mapbox-gl.css" rel="stylesheet" /> | |
| <style> | |
| body { | |
| margin: 0; | |
| padding: 0; | |
| } | |
| #map { | |
| position: absolute; | |
| top: 0; | |
| bottom: 0; | |
| width: 100%; | |
| } | |
| .places-box { | |
| height: 200px; | |
| width: 150px; | |
| position: absolute; | |
| bottom: 40px; | |
| right: 10px; | |
| background-color: #20B2AA; | |
| color: #fff; | |
| padding: 15px; | |
| text-align: center; | |
| font-size: 20px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script src='https://unpkg.com/@turf/turf/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> | |
| <div class="places-box"> | |
| <p>Draw a polygon around POIs</p> | |
| <div id="calculated-places"></div> | |
| </div> | |
| <script> | |
| mapboxgl.accessToken = 'pk.eyJ1IjoibWFsLXdvb2QiLCJhIjoiY2oyZ2t2em50MDAyMzJ3cnltMDFhb2NzdiJ9.X-D4Wvo5E5QxeP7K_I3O8w'; | |
| var map = new mapboxgl.Map({ | |
| container: 'map', // container id | |
| style: 'mapbox://styles/mapbox/streets-v11', //hosted style id | |
| center: [-80.00364074801722, 40.44017624226467], // starting position | |
| zoom: 18 // starting zoom | |
| }); | |
| var draw = new MapboxDraw({ | |
| displayControlsDefault: false, | |
| controls: { | |
| polygon: true, | |
| trash: true | |
| } | |
| }); | |
| map.addControl(draw); | |
| map.on('draw.create', updatePOIs); | |
| map.on('draw.delete', updatePOIs); | |
| map.on('draw.update', updatePOIs); | |
| function updatePOIs(e) { | |
| console.log('updatePOIs') | |
| var data = draw.getAll(); | |
| var answer = document.getElementById('calculated-places'); | |
| if (data.features.length > 0) { | |
| var bbox = turf.bbox(data) | |
| var southWestPointPixel = map.project([bbox[0], bbox[1]]); | |
| var northEastPointPixel = map.project([bbox[2], bbox[3]]); | |
| map.fitBounds([[bbox[0], bbox[1]], [bbox[2], bbox[3]]], { | |
| padding: { top: 10, bottom: 25, left: 15, right: 5 } | |
| }) | |
| map.once('moveend', function () { | |
| var features = map.queryRenderedFeatures([southWestPointPixel, northEastPointPixel], { layers: ['poi-label'] }) | |
| var filteredFeatures = features.reduce(function (accumulator, feature) { | |
| if (turf.booleanPointInPolygon(feature, data.features[0])) { | |
| accumulator.push(feature); | |
| }; | |
| return accumulator; | |
| }, []); | |
| answer.innerHTML = | |
| '<p><strong>' + | |
| filteredFeatures.length + | |
| '</strong></p><p>POIs selected</p>'; | |
| }); | |
| } else { | |
| answer.innerHTML = ''; | |
| if (e.type !== 'draw.delete') | |
| alert('Use the draw tools to draw a polygon!'); | |
| } | |
| } | |
| map.on('draw.update', updatePOIs); | |
| </script> | |
| </body> | |
| </html> |
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