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Linear and non-linear line chart
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| <!DOCTYPE html> | |
| <meta charset="utf-8" /> | |
| <style> | |
| #chart { | |
| text-align: center; | |
| margin-top: 40px; | |
| } | |
| </style> | |
| <body> | |
| <div id="chart"></div> | |
| </body> | |
| <script src="https://d3js.org/d3.v5.min.js"></script> | |
| <script> | |
| // Fake data | |
| const data = [ | |
| { | |
| year: 2000, | |
| aData: 50, | |
| bData: 300 | |
| }, | |
| { | |
| year: 2001, | |
| aData: 150, | |
| bData: 50 | |
| }, | |
| { | |
| year: 2002, | |
| aData: 200, | |
| bData: 100 | |
| }, | |
| { | |
| year: 2003, | |
| aData: 130, | |
| bData: 50 | |
| }, | |
| { | |
| year: 2004, | |
| aData: 240, | |
| bData: 80 | |
| }, | |
| { | |
| year: 2005, | |
| aData: 380, | |
| bData: 10 | |
| }, | |
| { | |
| year: 2006, | |
| aData: 420, | |
| bData: 200 | |
| } | |
| ]; | |
| const color = ["lightgreen", "lightblue"]; | |
| // Create SVG and padding for the chart | |
| const svg = d3 | |
| .select("#chart") | |
| .append("svg") | |
| .attr("height", 300) | |
| .attr("width", 600); | |
| const strokeWidth = 1.5; | |
| const margin = { top: 0, bottom: 20, left: 30, right: 20 }; | |
| const chart = svg.append("g").attr("transform", `translate(${margin.left},0)`); | |
| const width = +svg.attr("width") - margin.left - margin.right - strokeWidth * 2; | |
| const height = +svg.attr("height") - margin.top - margin.bottom; | |
| const grp = chart | |
| .append("g") | |
| .attr("transform", `translate(-${margin.left - strokeWidth},-${margin.top})`); | |
| // Create stack | |
| const stack = d3.stack().keys(["aData", "bData"]); | |
| const stackedValues = stack(data); | |
| const stackedData = []; | |
| // Copy the stack offsets back into the data. | |
| stackedValues.forEach((layer, index) => { | |
| const currentStack = []; | |
| layer.forEach((d, i) => { | |
| currentStack.push({ | |
| values: d, | |
| year: data[i].year | |
| }); | |
| }); | |
| stackedData.push(currentStack); | |
| }); | |
| // Create scales | |
| const yScale = d3 | |
| .scaleLinear() | |
| .range([height, 0]) | |
| .domain([0, d3.max(stackedValues[stackedValues.length - 1], dp => dp[1])]); | |
| const xScale = d3 | |
| .scaleLinear() | |
| .range([0, width]) | |
| .domain(d3.extent(data, dataPoint => dataPoint.year)); | |
| const area = d3 | |
| .area() | |
| .x(dataPoint => xScale(dataPoint.year)) | |
| .y0(dataPoint => yScale(dataPoint.values[0])) | |
| .y1(dataPoint => yScale(dataPoint.values[1])) | |
| .curve(d3.curveBasis) | |
| ; | |
| const series = grp | |
| .selectAll(".series") | |
| .data(stackedData) | |
| .enter() | |
| .append("g") | |
| .attr("class", "series"); | |
| series | |
| .append("path") | |
| .attr("transform", `translate(${margin.left},0)`) | |
| .style("fill", (d, i) => color[i]) | |
| .attr("stroke", "steelblue") | |
| .attr("stroke-linejoin", "round") | |
| .attr("stroke-linecap", "round") | |
| .attr("stroke-width", strokeWidth) | |
| .attr("d", d => area(d)); | |
| // Add the X Axis | |
| chart | |
| .append("g") | |
| .attr("transform", `translate(0,${height})`) | |
| .call(d3.axisBottom(xScale).ticks(data.length)); | |
| // Add the Y Axis | |
| chart | |
| .append("g") | |
| .attr("transform", `translate(0, 0)`) | |
| .call(d3.axisLeft(yScale)); | |
| </script> |
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