A pretty contrived example to try to help someone to show how to drag circles and have a line move with it. You can drag the light blue circle around and the line connecting it to the red point moves with it.
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February 12, 2019 15:27
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mapbox-gl.js drag a point and have a line that connects it to another point move
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset='utf-8' /> | |
| <title>Create a draggable point</title> | |
| <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' /> | |
| <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.53.0/mapbox-gl.js'></script> | |
| <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.53.0/mapbox-gl.css' rel='stylesheet' /> | |
| <style> | |
| body { margin:0; padding:0; } | |
| #map { position:absolute; top:0; bottom:0; width:100%; } | |
| </style> | |
| </head> | |
| <body> | |
| <style> | |
| .coordinates { | |
| background: rgba(0,0,0,0.5); | |
| color: #fff; | |
| position: absolute; | |
| bottom: 10px; | |
| left: 10px; | |
| padding:5px 10px; | |
| margin: 0; | |
| font-size: 11px; | |
| line-height: 18px; | |
| border-radius: 3px; | |
| display: none; | |
| } | |
| </style> | |
| <div id='map'></div> | |
| <pre id='coordinates' class='coordinates'></pre> | |
| <script src='./map.js'> | |
| </script> | |
| </body> | |
| </html> |
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| mapboxgl.accessToken = 'pk.eyJ1IjoibXBtY2tlbm5hOCIsImEiOiJfYWx3RlJZIn0.v-vrWv_t1ytntvWpeePhgQ'; | |
| var coordinates = document.getElementById('coordinates'); | |
| var map = new mapboxgl.Map({ | |
| container: 'map', | |
| style: 'mapbox://styles/mapbox/streets-v9', | |
| center: [0, 0], | |
| zoom: 2 | |
| }); | |
| var canvas = map.getCanvasContainer(); | |
| var geojson = { | |
| "type": "FeatureCollection", | |
| "features": [{ | |
| "type": "Feature", | |
| "geometry": { | |
| "type": "Point", | |
| "coordinates": [0, 0] | |
| } | |
| }] | |
| }; | |
| var parent = { | |
| "type": "FeatureCollection", | |
| "features": [{ | |
| "type": "Feature", | |
| "geometry": { | |
| "type": "Point", | |
| "coordinates": [13, 4] | |
| } | |
| }] | |
| }; | |
| var liner = { | |
| "type": "FeatureCollection", | |
| "features": [{ | |
| "type": "Feature", | |
| "geometry": { | |
| "type": "LineString", | |
| "coordinates": [ | |
| parent.features[0].geometry.coordinates, geojson.features[0].geometry.coordinates | |
| ] | |
| } | |
| }] | |
| }; | |
| function onMove(e) { | |
| var coords = e.lngLat; | |
| // Set a UI indicator for dragging. | |
| canvas.style.cursor = 'grabbing'; | |
| // Update the Point feature in `geojson` coordinates | |
| // and call setData to the source layer `point` on it. | |
| geojson.features[0].geometry.coordinates = [coords.lng, coords.lat]; | |
| liner.features[0].geometry.coordinates[1] = [coords.lng, coords.lat]; | |
| map.getSource('point').setData(geojson); | |
| map.getSource('liner').setData(liner); | |
| } | |
| function onUp(e) { | |
| var coords = e.lngLat; | |
| // Print the coordinates of where the point had | |
| // finished being dragged to on the map. | |
| coordinates.style.display = 'block'; | |
| coordinates.innerHTML = 'Longitude: ' + coords.lng + '<br />Latitude: ' + coords.lat; | |
| canvas.style.cursor = ''; | |
| // Unbind mouse/touch events | |
| map.off('mousemove', onMove); | |
| map.off('touchmove', onMove); | |
| } | |
| map.on('load', function() { | |
| // Add a single point to the map | |
| map.addSource('point', { | |
| "type": "geojson", | |
| "data": geojson | |
| }); | |
| map.addSource('parent', { | |
| "type": "geojson", | |
| "data": parent | |
| }); | |
| map.addLayer({ | |
| "id": "point", | |
| "type": "circle", | |
| "source": "point", | |
| "paint": { | |
| "circle-radius": 10, | |
| "circle-color": "#3887be" | |
| } | |
| }); | |
| map.addLayer({ | |
| "id": "parent", | |
| "type": "circle", | |
| "source": "parent", | |
| "paint": { | |
| "circle-radius": 30, | |
| "circle-color": "#e887be" | |
| } | |
| }); | |
| map.addLayer({ | |
| 'id': 'liner', | |
| 'type': 'line', | |
| 'source': { | |
| 'type': 'geojson', | |
| 'data': liner | |
| }, | |
| 'layout': { | |
| 'line-cap': 'round', | |
| 'line-join': 'round' | |
| }, | |
| 'paint': { | |
| 'line-color': '#ed6498', | |
| 'line-width': 5, | |
| 'line-opacity': .8 | |
| } | |
| }); | |
| // When the cursor enters a feature in the point layer, prepare for dragging. | |
| map.on('mouseenter', 'point', function() { | |
| map.setPaintProperty('point', 'circle-color', '#3bb2d0'); | |
| canvas.style.cursor = 'move'; | |
| }); | |
| map.on('mouseleave', 'point', function() { | |
| map.setPaintProperty('point', 'circle-color', '#3887be'); | |
| canvas.style.cursor = ''; | |
| }); | |
| map.on('mousedown', 'point', function(e) { | |
| // Prevent the default map drag behavior. | |
| e.preventDefault(); | |
| canvas.style.cursor = 'grab'; | |
| map.on('mousemove', onMove); | |
| map.once('mouseup', onUp); | |
| }); | |
| map.on('touchstart', 'point', function(e) { | |
| if (e.points.length !== 1) return; | |
| // Prevent the default map drag behavior. | |
| e.preventDefault(); | |
| map.on('touchmove', onMove); | |
| map.once('touchend', onUp); | |
| }); | |
| }); |
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