Yuichi Yazaki 作の日本の topojson。 Canvas で最もシンプルな描画。 描画点数が多いため、フレームレートはあまり出ない。
使用しているデータのリポジトリ: https://github.com/dataofjapan/land
データの出典元：地球地図日本
Last active
February 6, 2016 10:08
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japan.topojson (canvas)
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| <!DOCTYPE html> | |
| <meta charset='utf-8'> | |
| <script src='//d3js.org/d3.v3.min.js'></script> | |
| <script src='https://d3js.org/topojson.v1.min.js'></script> | |
| <body> | |
| <div id='map_canvas' style='position:absolute'></div> | |
| <script> | |
| var map={}; | |
| map.width = 960; | |
| map.height = 500; | |
| map.scale = 862.5420350331074; | |
| map.translate = [-1607.5029017610468, 824.1369223542354]; | |
| map.zoom = d3.behavior.zoom(); | |
| map.zoomed = function() | |
| { | |
| map.translate = map.zoom.translate(); | |
| map.scale = map.zoom.scale(); | |
| map.draw(); | |
| } | |
| map.zoom.on('zoom',map.zoomed); | |
| map.zoom.translate(map.translate); | |
| map.zoom.scale(map.scale); | |
| map.canvas = d3.select('#map_canvas') | |
| .append('canvas') | |
| .attr('width', map.width) | |
| .attr('height',map.height) | |
| .call(map.zoom); | |
| map.context = map.canvas.node().getContext('2d'); | |
| map.draw = function() | |
| { | |
| map.context.clearRect(0,0,map.width,map.height); | |
| map.projection.scale(map.scale); | |
| map.projection.translate(map.translate); | |
| map.context.beginPath(); | |
| map.path(map.prefectures); | |
| map.context.fill(); | |
| map.context.stroke(); | |
| } | |
| d3.json('/osoken/raw/b8e5859295757bb2ec5b/japan.topojson',function(error,data) | |
| { | |
| if (error) | |
| { | |
| console.log(error); | |
| return; | |
| } | |
| map.prefectures = topojson.feature(data, data.objects.japan); | |
| map.projection = d3.geo.mercator() | |
| .scale(map.scale) | |
| .translate(map.translate); | |
| map.path = d3.geo.path().projection(map.projection).context(map.context); | |
| map.context.lineWidth = 1.2; | |
| map.context.strokeStyle = '#888'; | |
| map.context.fillStyle = '#ccc'; | |
| map.draw(); | |
| }); | |
| </script> |
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