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January 12, 2018 15:34
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demonstrates path interpolation caveat
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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; } | |
| button { | |
| font-size: 16px; | |
| margin: 15px; | |
| padding: 10px; | |
| } | |
| svg { | |
| border: 1px solid gray; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <button id="update">Press Me</button> | |
| <script> | |
| const margin = {left: 15, top: 15, right: 15, bottom: 40}; | |
| const width = 960 - margin.left - margin.right; | |
| const height = 500 - margin.top - margin.bottom; | |
| const svg = d3.select("body").append("svg") | |
| .attr("width", 960) | |
| .attr("height", 500); | |
| const data = Array(4).fill(0).map(generateData.bind(null, 10)); | |
| const xMax = Math.max(...data.reduce((acc, x) => acc.concat([x.length - 1]), [])); | |
| const xScale = d3.scaleLinear() | |
| .domain([0, xMax]) | |
| .range([0, width]); | |
| const yScale = d3.scaleLinear() | |
| .domain(d3.extent(data.reduce((acc, x) => acc.concat(x), []))) | |
| .range([height, 0]); | |
| const container = svg | |
| .append('g') | |
| .attr('transform', `translate(${margin.left}, ${margin.top})`); | |
| const line = d3.line() | |
| .x((d, i) => xScale(i)) | |
| .y(d => yScale(d)) | |
| .curve(d3.curveCatmullRom); | |
| const color = (i) => | |
| `hsl(${Math.floor(240/data.length) * i}, 80%, 50%)`; | |
| container | |
| .selectAll('path') | |
| .data(data, (d, i) => i) | |
| .enter() | |
| .append('path') | |
| .attr('d', line) | |
| .attr('fill', 'transparent') | |
| .attr('stroke', (d, i) => color(i)) | |
| .attr('stroke-width', 2); | |
| const xAxis = d3.axisBottom(xScale); | |
| container | |
| .append('g') | |
| .attr('class', 'x-axis') | |
| .attr('transform', `translate(0, ${height + 16})`) | |
| .call(xAxis); | |
| function update() { | |
| const x = Math.floor(Math.random() * 20) + 2; | |
| data.forEach((d, i) => data[i] = generateData(x)); | |
| const y = data.reduce((acc, x) => acc.concat(x), []); | |
| xScale.domain([0, x - 1]); | |
| yScale.domain(d3.extent(y)); | |
| container | |
| .selectAll('path') | |
| .data(data, (d, i) => i) | |
| .transition() | |
| .duration(500) | |
| .attr('d', line); | |
| container | |
| .select('.x-axis') | |
| .transition() | |
| .duration(500) | |
| .call(d3.axisBottom(xScale)); | |
| } | |
| function generateData(size = 0) { | |
| return Array(size).fill(0).map(() => Math.random()); | |
| } | |
| window.addEventListener('load', () => { | |
| document.querySelector('#update') | |
| .addEventListener('click', update); | |
| }); | |
| </script> | |
| </body> |
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