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Qiita新着投稿100件のタグをd3.jsのForceレイアウトで表示
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Qiita新着投稿100件のタグをd3.jsのForceレイアウトで表示</title> | |
| <style> | |
| svg { | |
| border: solid 1px; | |
| } | |
| .node circle { | |
| stroke: #000; | |
| stroke-width: .5px; | |
| opacity: .7; | |
| } | |
| .node text { | |
| pointer-events: none; | |
| font-size: 8px; | |
| } | |
| .node .shadow { | |
| stroke: #fff; | |
| stroke-width: 3px; | |
| stroke-opacity: .7; | |
| } | |
| .node .text { | |
| } | |
| .link { | |
| stroke: #888; | |
| opacity: .3; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script type="text/javascript" src="http://d3js.org/d3.v3.min.js"></script> | |
| <script type="text/javascript" src="qiita-tag-force.js"></script> | |
| </body> | |
| </html> |
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| var NAME_PREFIX = "__"; | |
| d3.json('https://qiita.com/api/v1/items?per_page=100', function(error, items) { | |
| //タグ投稿数のカウント | |
| var tags = items.reduce(function(tags, item) { | |
| item.tags.forEach(function(tag) { | |
| var name = NAME_PREFIX + tag.name; | |
| if (!(name in tags)) { | |
| tags[name] = { | |
| name: tag.name, | |
| urlName: tag.url_name, | |
| count: 0 | |
| }; | |
| } | |
| tags[name].count++; | |
| }); | |
| return tags; | |
| }, []); | |
| //ノードデータの作成 | |
| var nodes = d3.values(tags) | |
| .sort(function(tag1, tag2) { | |
| return tag1.count - tag2.count; | |
| }); | |
| //タグ組み合わせ数のカウント | |
| var tagLinks = items.reduce(function(links, item) { | |
| item.tags.forEach(function(tag1) { | |
| item.tags.forEach(function(tag2) { | |
| var key = tag1.name + NAME_PREFIX + tag2.name; | |
| if (!(key in links)) { | |
| links[key] = { | |
| source: nodes.indexOf(tags[NAME_PREFIX + tag1.name]), | |
| target: nodes.indexOf(tags[NAME_PREFIX + tag2.name]), | |
| count: 0 | |
| }; | |
| } | |
| links[key].count++; | |
| }) | |
| }) | |
| return links; | |
| }, []); | |
| //リンクデータの作成 | |
| var links = d3.values(tagLinks); | |
| var width = 1024, | |
| height = 800; | |
| var color = d3.scale.category20(); | |
| var force = d3.layout.force() | |
| // .charge(-200) | |
| .charge(function(d) { | |
| return -(d.count * 150); | |
| }) | |
| .linkDistance(30) | |
| .linkStrength(1.0) | |
| .gravity(0.2) | |
| .size([width, height]); | |
| var svg = d3.select('body').append('svg') | |
| .attr('width', width) | |
| .attr('height', height); | |
| force | |
| .nodes(nodes) | |
| .links(links) | |
| .start(); | |
| var link = svg.selectAll('.link') | |
| .data(links) | |
| .enter().append('line') | |
| .attr('class', 'link') | |
| .style('stroke-width', function(d) { return d.count * d.count; }); | |
| var node = svg.selectAll('.node') | |
| .data(nodes) | |
| .enter().append('g') | |
| .attr('class', 'node') | |
| .call(force.drag); | |
| var a = node.append('a') | |
| .attr('xlink:href', function(d) { return 'http://qiita.com/tags/' + d.urlName + '/items'; }) | |
| .attr('target', '_blank'); | |
| a.append('circle') | |
| .attr('r', function(d) { return 8 * Math.sqrt(d.count) }) | |
| .style('fill', function(d) { return color(d.index); }) | |
| .on('mouseover', function(d) { d3.select(this.parentNode.parentNode).style('z-index', 999); }) | |
| .on('mouseout', function(d) { d3.select(this.parentNode.parentNode).style('z-index', null); }) | |
| node.append('text') | |
| .attr('class', 'shadow') | |
| .attr('dx', 0) | |
| .attr('dy', '.5em') | |
| .style('font-size', function(d) { return (6 * Math.sqrt(d.count)) + 'px' }) | |
| .text(function(d) { return d.name + '(' + d.count + ')'; }) | |
| node.append('text') | |
| .attr('class', 'text') | |
| .attr('dx', 0) | |
| .attr('dy', '.5em') | |
| .style('font-size', function(d) { return (6 * Math.sqrt(d.count)) + 'px' }) | |
| .text(function(d) { return d.name + '(' + d.count + ')'; }) | |
| node.append('title') | |
| .text(function(d) { return d.name + ':' + d.count; }); | |
| force.on('tick', function() { | |
| link.attr('x1', function(d) { return d.source.x; }) | |
| .attr('y1', function(d) { return d.source.y; }) | |
| .attr('x2', function(d) { return d.target.x; }) | |
| .attr('y2', function(d) { return d.target.y; }); | |
| node.attr('transform', function(d) { return 'translate(' + d.x + ',' + d.y + ')'; }); | |
| }); | |
| }); |
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