An example of running bar chart with changing colors.
forked from gnykka's block: Dynamic Bar Chart
forked from vikkya's block: Dynamic Bar Chart
Last active
August 16, 2019 13:25
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Dynamic Bar Chart
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| license: mit |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v5.min.js"></script> | |
| <style> | |
| .container { | |
| width: 100%; | |
| text-align: center; | |
| } | |
| svg { | |
| margin-top: 40px; | |
| } | |
| .bar { stroke: white; } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="container"> | |
| <svg width="450" height="50"></svg> | |
| </div> | |
| <script> | |
| const svg = d3.select('svg'); | |
| const width = +svg.attr('width'); | |
| const height = +svg.attr('height') / 2; | |
| const g = svg.append('g'); | |
| const n = width / 3; | |
| const minY = 0.2; | |
| const maxHue = 360; | |
| const hueDelta = maxHue / n; | |
| const keys = [...Array(n).keys()]; | |
| const xScale = d3.scaleBand() | |
| .rangeRound([0, width]) | |
| .domain(keys); | |
| const yScale = d3.scaleLinear() | |
| .rangeRound([height, 0]) | |
| .domain([0, 1 + minY]); | |
| const draw = (data) => { | |
| g.selectAll('.bar') | |
| .data(data) | |
| .join('rect') | |
| .attr('class', 'bar') | |
| .attr('fill', (v, i) => `hsla(${(i - round) * hueDelta}, 100%, 50%, 1)`) | |
| .attr('x', (_, i) => xScale(i)) | |
| .attr('y', v => yScale(v + minY)) | |
| .attr('width', xScale.bandwidth()) | |
| .attr('height', v => 2 * (height - yScale(v + minY))); | |
| }; | |
| let round = 0; | |
| let data = keys.map((_, i) => 0); | |
| setInterval(() => { | |
| data = data.map(v => { | |
| let newV = v; | |
| if (v === 1) { newV = v - 0.1; } | |
| else if (v === 0) { newV = v + 0.1; } | |
| else { | |
| const random = Math.random(); | |
| newV = random < 0.5 ? v - 0.1 : v + 0.1; | |
| } | |
| return Math.round(newV * 10) / 10; | |
| }); | |
| round = round === (maxHue - 1) ? 0 : round + 1; | |
| draw(data); | |
| }, 100); | |
| draw(data); | |
| </script> | |
| </body> |
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