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geoVoronoi Google Maps
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| license: mit |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>geoVoronoi Google Maps</title> | |
| <script src="//maps.googleapis.com/maps/api/js"></script> | |
| <script src="//d3js.org/d3.v4.min.js"></script> | |
| <script src="//d3js.org/d3-geo-projection.v2.min.js"></script> | |
| <script src="//unpkg.com/d3-geo-voronoi"></script> | |
| <script src="//unpkg.com/unique-colors"></script> | |
| <style type="text/css"> | |
| html, | |
| body { | |
| margin: 0px; | |
| padding: 0px; | |
| } | |
| html, | |
| body, | |
| #map { | |
| width: 100%; | |
| height: 100%; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="map"></div> | |
| <script type="text/javascript"> | |
| 'use strict'; | |
| d3.json("point.json", function (error, pointjson) { | |
| if (error) throw error; | |
| const map = new google.maps.Map(document.getElementById('map'), { | |
| zoom: 5, | |
| mapTypeId: google.maps.MapTypeId.TERRAIN, | |
| center: new google.maps.LatLng(40, -8), | |
| }); | |
| const proj = d3.geoEquirectangular().translate([0, 0]).scale(180 / Math.PI) | |
| const reflect = d3.geoIdentity().reflectY(true) | |
| const antimeridian_cut = a => d3.geoProject(d3.geoProject(a, proj), reflect); | |
| const voronoi = d3.geoVoronoi()(pointjson.features) | |
| const polygons = antimeridian_cut(voronoi.polygons()) | |
| map.data.addGeoJson(pointjson) | |
| const palette = unique_colors(polygons.features.length) | |
| let color = 0 | |
| polygons.features.forEach(a => { a.properties.fillColor = palette[color++]; return map.data.addGeoJson(a) }) | |
| map.data.setStyle(function (feature) { | |
| let fillColor = feature.getProperty('fillColor') | |
| if (fillColor) | |
| return { | |
| clickable: false, | |
| fillOpacity: 0.2, | |
| fillColor: fillColor, | |
| strokeWeight: 0, | |
| } | |
| return {} | |
| }); | |
| let polyline = null; | |
| let marker = null; | |
| let polyline_on = false | |
| const onmousemove = function (e) { | |
| const latlng_mouse = e.latLng | |
| const site = voronoi.find(latlng_mouse.lng(), latlng_mouse.lat()) | |
| const latlng_site = new google.maps.LatLng(site.geometry.coordinates[1], site.geometry.coordinates[0]) | |
| const distance = google.maps.geometry.spherical.computeDistanceBetween(latlng_mouse, latlng_site); | |
| if (polyline) | |
| polyline.setMap(null) | |
| if (marker) | |
| marker.setMap(null) | |
| polyline = new google.maps.Polyline({ | |
| path: [latlng_site, latlng_mouse], | |
| geodesic: true, | |
| clickable: false, | |
| strokeColor: 'blue', | |
| strokeOpacity: 1.0, | |
| strokeWeight: 2 | |
| }); | |
| polyline.setMap(map); | |
| marker = new google.maps.Marker({ | |
| position: latlng_mouse, | |
| clickable: false, | |
| icon: { | |
| path: google.maps.SymbolPath.CIRCLE, | |
| strokeColor: "blue", | |
| scale: 3 | |
| }, | |
| label: (distance / 1000.0).toFixed(1) + " km " + site.id, | |
| map: map | |
| }); | |
| } | |
| google.maps.event.addListener(map, 'click', function (e) { | |
| if (polyline_on) { | |
| polyline_on = false | |
| google.maps.event.clearListeners(map, 'mousemove'); | |
| if (polyline) | |
| polyline.setMap(null) | |
| polyline = null | |
| if (marker) | |
| marker.setMap(null) | |
| marker = null | |
| } | |
| else { | |
| polyline_on = true | |
| google.maps.event.addListener(map, 'mousemove', onmousemove) | |
| } | |
| }); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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