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Vector tiles on canvas!
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| L.tileLayer.fancyCanvas = function(url){ | |
| var layer = L.tileLayer.canvas(); | |
| layer.setUrl(url); | |
| var dataSource = function(x, y, z, done){ | |
| var url = layer.getTileUrl({x: x, y: y, z: z}); | |
| d3.json(url, done); | |
| }; | |
| layer.data = function(fn){ | |
| dataSource = fn; | |
| return layer; | |
| }; | |
| var dataTransformer = function(d){return d}; | |
| layer.transform = function(transformer){ | |
| dataTransformer = transformer; | |
| return layer; | |
| }; | |
| var renderer = function(context, d){ | |
| console.error('No renderer specified, defaulting to black on black'); | |
| context.fill(); | |
| context.stroke(); | |
| }; | |
| layer.renderer = function(fn){ | |
| renderer = fn; | |
| return layer; | |
| }; | |
| layer.drawTile = function(canvas, tilePoint, zoom) { | |
| var context = canvas.getContext('2d'); | |
| dataSource(tilePoint.x, tilePoint.y, zoom, function(err, data){ | |
| data = dataTransformer(data); | |
| var tileOffset = { | |
| x: parseInt(d3.select(canvas).style('left').slice(0, -2)), | |
| y: parseInt(d3.select(canvas).style('top').slice(0, -2)) | |
| }; | |
| var projection = d3.geo.transform({ | |
| point: function(y, x) { | |
| var point = map.latLngToLayerPoint(new L.LatLng(x, y)); | |
| this.stream.point(point.x-tileOffset.x, point.y-tileOffset.y); | |
| } | |
| }); | |
| var path = d3.geo.path() | |
| .projection(projection) | |
| .context(context); | |
| if (typeof renderer == 'function') { | |
| data.features.forEach(function(feature){ | |
| context.beginPath(); | |
| path(feature); | |
| context.closePath(); | |
| renderer(context, feature, data); | |
| }); | |
| } else if (Array.isArray(renderer)) { | |
| renderer.forEach(function(fn){ | |
| data.features.forEach(function(feature){ | |
| context.beginPath(); | |
| path(feature); | |
| context.closePath(); | |
| fn(context, feature, data); | |
| }); | |
| }); | |
| } else { | |
| throw new Error('wtf'); | |
| } | |
| }); | |
| }; | |
| return layer; | |
| }; |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Canvas Layer!</title> | |
| <meta charset="utf-8"> | |
| <link rel="stylesheet" type="text/css" href="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.css"> | |
| <link rel="stylesheet" type="text/css" href="main.css"> | |
| </head> | |
| <body> | |
| <div id="map"></div> | |
| <script src="https://cdn.rawgit.com/jondavidjohn/hidpi-canvas-polyfill/master/dist/hidpi-canvas.js"></script> | |
| <script src="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js"></script> | |
| <script src="http://d3js.org/d3.v3.js"></script> | |
| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| <script src="fancyCanvas.js"></script> | |
| <script src="layer.js"></script> | |
| </body> | |
| </html> |
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| var map = L.map('map', { | |
| center: [44.4670,-73.2180], | |
| zoom: 12, | |
| minZoom: 3, | |
| maxZoom: 16 | |
| }); | |
| L.tileLayer('http://{s}.tile.stamen.com/terrain-background/{z}/{x}/{y}.jpg').addTo(map); | |
| var url = 'http://{s}.tile.openstreetmap.us/vectiles-highroad/{z}/{x}/{y}.topojson'; | |
| var roadSizes = { | |
| "highway": 5, | |
| "major_road": 3, | |
| "minor_road": 1, | |
| "rail": 0, | |
| "path": 0.5 | |
| }; | |
| L.tileLayer.fancyCanvas(url) | |
| .transform(function(d){ | |
| if (d.objects) { | |
| return topojson.feature(d, d.objects.vectile); | |
| } else { | |
| return { | |
| type: 'FeatureCollection', | |
| features: [] | |
| } | |
| } | |
| }) | |
| .renderer([function(context, d){ | |
| context.lineCap = 'round'; | |
| context.lineJoin = 'round'; | |
| context.strokeStyle = '#000'; | |
| context.lineWidth = roadSizes[d.properties.kind]+2; | |
| context.stroke(); | |
| }, function(context, d){ | |
| context.lineCap = 'round'; | |
| context.lineJoin = 'round'; | |
| context.strokeStyle = '#fff'; | |
| context.lineWidth = roadSizes[d.properties.kind]; | |
| context.stroke(); | |
| }]).addTo(map); |
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| html, body { | |
| height: 100%; | |
| padding: 0; | |
| margin: 0; | |
| } | |
| #map { | |
| width: 100%; | |
| height: 100%; | |
| } |
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