Uses d3-area-label.
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forked from curran's block: Labeled Streamgraph
Created
July 27, 2017 17:25
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Labeled Streamgraph
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| license: mit |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <script src="https://unpkg.com/[email protected]"></script> | |
| <script src="https://unpkg.com/[email protected]"></script> | |
| <title>Area Label Test</title> | |
| <style> | |
| .area-label { | |
| font-family: sans-serif; | |
| fill-opacity: 0.5; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <svg width="960" height="500"></svg> | |
| <script> | |
| const svg = d3.select('svg') | |
| const width = +svg.attr('width') | |
| const height = +svg.attr('height') | |
| const n = 100 | |
| const keys = ['Leonardo', 'Donatello', 'Raphael', 'Michelangelo'] | |
| const generateData = keys => { | |
| const prev = {} | |
| const velocity = {} | |
| return d3.range(n).map((d, i) => { | |
| const row = { time: i } | |
| keys.forEach(key => { | |
| velocity[key] = ((velocity[key] || 0) + (Math.random() - .5)) * 0.9 | |
| const value = Math.max(0.2, (prev[key] || Math.random() * 10) + velocity[key]) | |
| prev[key] = row[key] = value | |
| }) | |
| return row | |
| }) | |
| } | |
| const data = generateData(keys) | |
| const stack = d3.stack() | |
| .keys(keys) | |
| .offset(d3.stackOffsetWiggle) | |
| const xValue = d => d.time | |
| const xScale = d3.scaleLinear() | |
| const yScale = d3.scaleLinear() | |
| const colorScale = d3.scaleOrdinal() | |
| .domain(keys) | |
| .range(d3.schemeCategory10) | |
| const areaFillOpacity = 0.3 | |
| const area = d3.area() | |
| .x(d => xScale(xValue(d.data))) | |
| .y0(d => yScale(d[0])) | |
| .y1(d => yScale(d[1])) | |
| .curve(d3.curveBasis) | |
| const stacked = stack(data) | |
| xScale | |
| .domain(d3.extent(data, d => xScale(xValue(d)))) | |
| .range([0, width]) | |
| yScale | |
| .domain([ | |
| d3.min(stacked[0], d => d[0]), | |
| d3.max(stacked[stacked.length - 1], d => d[1]) | |
| ]) | |
| .range([height, 0]) | |
| const paths = svg.selectAll('path').data(stacked) | |
| paths | |
| .enter().append('path') | |
| .attr('fill-opacity', areaFillOpacity) | |
| .merge(paths) | |
| .attr('d', area) | |
| .attr('fill', d => colorScale(d.key)) | |
| .attr('stroke', d => colorScale(d.key)) | |
| const labels = svg.selectAll('text').data(stacked) | |
| labels | |
| .enter().append('text') | |
| .attr('class', 'area-label') | |
| .merge(labels) | |
| .text(d => d.key) | |
| .each(d3.areaLabel(area)) | |
| </script> | |
| </body> | |
| </html> |
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