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July 12, 2017 01:53
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Metis: Data Transformation + Nest (sxywu)
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| license: mit |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| </style> | |
| </head> | |
| <body> | |
| <svg /> | |
| <script> | |
| // var data = [{ | |
| // name: 'Sequoia', | |
| // investments: [ | |
| // { | |
| // name: 'Airbnb', | |
| // amount: 20200, // millions | |
| // year: 2010, | |
| // sector: 'consumer' | |
| // }, | |
| // { | |
| // name: 'Pinterest', | |
| // amount: 23874, | |
| // year: 2008, | |
| // sector: 'consumer' | |
| // } | |
| // ] | |
| // }, { | |
| // }]; | |
| var data = [{ | |
| name: 'Airbnb', | |
| amount: 20200, // millions | |
| year: 2010, | |
| sector: 'consumer', | |
| investor: 'Sequoia' | |
| }, { | |
| name: 'Pinterest', | |
| amount: 23874, | |
| year: 2008, | |
| sector: 'consumer', | |
| investor: 'Sequoia' | |
| }, { | |
| name: 'Airbnb', | |
| amount: 20200, // millions | |
| year: 2010, | |
| sector: 'consumer', | |
| investor: 'Benchmark' | |
| }, { | |
| name: 'Spotify', | |
| amount: 239847, | |
| year: 2091, | |
| sector: 'consumer', | |
| investor: 'Benchmark' | |
| }, { | |
| name: 'Slack', | |
| amount: 238947, | |
| year: 2012, | |
| sector: 'enterprise', | |
| investor: 'a16z', | |
| }, { | |
| name: 'Slack', | |
| amount: 238947, | |
| year: 2012, | |
| sector: 'enterprise', | |
| investor: 'Google Ventures', | |
| }, { | |
| name: 'Tanium', | |
| amount: 123987, | |
| year: 2002, | |
| sector: 'enterprise', | |
| investor: 'IVP' | |
| }, { | |
| name: 'Lyft', | |
| amount: 123987, | |
| year: 2002, | |
| sector: 'consumer', | |
| investor: 'a16z' | |
| }]; | |
| // bar chart, x-axis (ordinal) investor | |
| // y-axis # of unicorns | |
| // if stacked, sector (consumer vs. enterprise) | |
| // color by sector | |
| // hover to see individual unicorns | |
| // each bar is an investor | |
| data = d3.nest() | |
| .key(function(d) {return d.investor}) | |
| .entries(data); | |
| // draw bar chart, each investor has | |
| // rectangle and text (# of unicorns) | |
| // <g> | |
| // <rect> | |
| // <text> | |
| // </g> | |
| var svg = d3.select('svg') | |
| .attr('width', 960) | |
| .attr('height', 500); | |
| var bars = svg.selectAll('g') | |
| .data(data, function(d) {return d.key}); | |
| // exit | |
| bars.exit().remove(); | |
| // enter | |
| var enter = bars.enter().append('g'); | |
| enter.append('rect'); // inherit the data | |
| enter.append('text'); // bound on the parent | |
| // enter + update | |
| bars = enter.merge(bars) | |
| .attr('transform', function (d, i) { | |
| // please write scale | |
| // don't be lazy like me | |
| var x = i * 25; | |
| var y = 500 - d.values.length * 100; | |
| return 'translate(' + [x, y] + ')'; | |
| }); | |
| // rectangle height + y | |
| bars.select('rect') | |
| .attr('height', function(d, i) {return d.values.length * 100}) | |
| .attr('width', 20) | |
| .attr('fill', 'steelblue') | |
| .attr('opacity', 0.5); | |
| bars.select('text') | |
| .attr('x', 5) | |
| .attr('y', -5) | |
| .text(function(d) {return d.values.length}); | |
| </script> | |
| </body> |
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