Demonstration for http://blog.infographics.tw/2015/05/d3js-tutorial-bubble-chart/
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D3.JS Pack Layout Tutorial
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| html, | |
| body { | |
| width: 100%; | |
| height: 100%; | |
| margin: 0; | |
| padding: 0; | |
| } | |
| #root { | |
| margin: 20px; | |
| } |
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| <!DOCTYPE html><html lang="en"><head prefix="og: http://ogp.me/ns#"><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>template</title><link rel="stylesheet" type="text/css" href="index.css"></head><body><div id="root"><svg width="100%" height="600px" viewBox="0 0 800 600" preserveAspectRatio="xMidYMid"></svg></div><script type="text/javascript" src="//d3js.org/d3.v3.min.js"></script><script type="text/javascript" src="index.js"></script></body></html> |
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| d3.csv("population.csv", function(data) { | |
| var dataobj = { children: data }; | |
| var pack = d3.layout.pack(); | |
| pack = pack.padding(2).size([800,600]).sort(function(a,b) { return b.value - a.value; }); | |
| var nodes = pack.nodes(dataobj); | |
| nodes = nodes.filter(function(it) { return it.parent; }); | |
| var color = d3.scale.category20(); | |
| d3.select("svg") | |
| .selectAll("circle") // 建立 circle 的 Selection | |
| .data(nodes) // 綁定 selection 與資料 | |
| .enter() // 對於任何沒被對應而落單的資料 ... | |
| .append("circle") // 新增一個 circle 標籤 | |
| .attr({ | |
| cx: function(it) { return it.x; }, // 用 x,y 當圓心 | |
| cy: function(it) { return it.y; }, | |
| r : function(it) { return it.r; }, // 用 r 當半徑 | |
| fill: function(it) { return color(it.country); }, | |
| stroke: "#444", // 邊框畫深灰色 | |
| }); | |
| d3.select("svg").selectAll("text").data(nodes).enter() | |
| .append("text") | |
| .attr({ | |
| x: function(it) { return it.x; }, | |
| y: function(it) { return it.y; }, | |
| "text-anchor": "middle", // 文字水平置中 | |
| }).text(function(it) { return (it.value>60000000?it.country:""); }); // 設定文字為國名 | |
| }); | |
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