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Vega Lite pie chart https://bl.ocks.org/betafcc/9eb6fa7f2f43bae71dc07b833499f7d0
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <title>Vega Lite pie chart</title> | |
| <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/vega-embed/3.23.1/vega-embed.min.css" /> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/vega/4.3.0/vega.min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/vega-lite/2.6.0/vega-lite.min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/vega-embed/3.23.1/vega-embed.min.js"></script> | |
| </head> | |
| <body> | |
| <div id="vis"></div> | |
| <script src="util.js"></script> | |
| <script> | |
| const data = [{"A": 1}, {"A": 2}, {"A": 3}, {"A": 4}, {"A": 5}] | |
| const values = features({data, column: 'A'}) | |
| const spec = { | |
| data: {values}, | |
| mark: 'geoshape', | |
| projection: {type: 'azimuthalEquidistant', rotate: [0, 90, 0]}, | |
| encoding: { | |
| color: {field: 'A', type: 'nominal'}, | |
| tooltip: [{field: 'A', type: 'nominal'}], | |
| } | |
| } | |
| vegaEmbed('#vis', spec, {defaultStyle: true}) | |
| </script> | |
| </body> | |
| </html> |
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| const features = ({data: [...rows], column}) => | |
| geometries(rows.map(r => r[column])) | |
| .map((el, i) => ({ | |
| ...rows[i], | |
| type: 'Feature', | |
| geometry: el | |
| })) | |
| const geometries = ([...xs]) => | |
| xs | |
| // map to angles | |
| .map(linearScale({ | |
| domain: [0, xs.reduce((a, b) => a + b)], | |
| range: [0, 360], | |
| })) | |
| // cumulative sum | |
| .reduce((acc, n, i) => acc.concat(acc[i] + n), [0]) | |
| // take pairs | |
| .reduce((acc, n, i, arr) => [...acc, [arr[i - 1], n]], []).slice(1) | |
| // to geojson geometry | |
| .map(([startAngle, endAngle]) => ({ | |
| type: 'Polygon', | |
| coordinates: [[ | |
| [0, 90], | |
| [endAngle, -89], | |
| [startAngle, -89], | |
| [0, 90], | |
| ]] | |
| })) | |
| const linearScale = ({domain: [xi, xf], range: [yi, yf]}) => { | |
| const a = (yi - yf) / (xi - xf) | |
| const b = yi - a * xi | |
| return x => a * x + b | |
| } |
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