| license: mit |
This is a simple graph demonstrating the addition of a filled area in conjunction with a line graph. This was written using d3.js v4 and is a follow on to the simple graph example here.
This graph is part of the code samples for the update to the book D3 Tips and Tricks to version 4 of d3.js.
forked from d3noob's block: Simple graph with filled area in v4
| date | close | |
|---|---|---|
| 1-May-12 | 58.13 | |
| 30-Apr-12 | 53.98 | |
| 27-Apr-12 | 67.00 | |
| 26-Apr-12 | 89.70 | |
| 25-Apr-12 | 99.00 | |
| 24-Apr-12 | 130.28 | |
| 23-Apr-12 | 166.70 | |
| 20-Apr-12 | 234.98 | |
| 19-Apr-12 | 345.44 | |
| 18-Apr-12 | 443.34 | |
| 17-Apr-12 | 543.70 | |
| 16-Apr-12 | 580.13 | |
| 13-Apr-12 | 605.23 | |
| 12-Apr-12 | 622.77 | |
| 11-Apr-12 | 626.20 | |
| 10-Apr-12 | 628.44 | |
| 9-Apr-12 | 636.23 | |
| 5-Apr-12 | 633.68 | |
| 4-Apr-12 | 624.31 | |
| 3-Apr-12 | 629.32 | |
| 2-Apr-12 | 618.63 | |
| 30-Mar-12 | 599.55 | |
| 29-Mar-12 | 609.86 | |
| 28-Mar-12 | 617.62 | |
| 27-Mar-12 | 614.48 | |
| 26-Mar-12 | 606.98 |
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> /* set the CSS */ | |
| .line { | |
| fill: none; | |
| stroke: steelblue; | |
| stroke-width: 2px; | |
| } | |
| .area { | |
| fill: lightsteelblue; | |
| } | |
| .sla__line { | |
| stroke: #F74C7D; | |
| stroke-width: 2; | |
| stroke-dasharray: 6 3; | |
| } | |
| .sla__label { | |
| fill: white; | |
| } | |
| .issue__line { | |
| stroke: steelblue; | |
| stroke-width: 20; | |
| opacity: .5; | |
| } | |
| </style> | |
| <body> | |
| <!-- load the d3.js library --> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| // set the dimensions and margins of the graph | |
| const margin = {top: 20, right: 20, bottom: 30, left: 80}; | |
| const width = 960 - margin.left - margin.right; | |
| const height = 500 - margin.top - margin.bottom; | |
| const arr = []; | |
| // parse the date / time | |
| const dateFormat = "%B %d, %Y"; | |
| const parseTime = d3.timeParse(dateFormat); | |
| const formatTime = d3.timeFormat(dateFormat); | |
| const randNum = (min, max) => Math.floor(Math.random() * (max - min + 1)) + min; | |
| // Set up random data | |
| const numDays = 45; | |
| const graphData = Array(numDays) | |
| .fill() | |
| .map((_, index) => { | |
| const newD = new Date(); | |
| newD.setDate(newD.getDate() - index); | |
| return { | |
| date: parseTime(formatTime(newD)), | |
| value: randNum(5, 15) | |
| } | |
| }); | |
| const fillArr = (num) => { | |
| if (arr.includes(num)) { | |
| fillArr(randNum(num - 1, 20)); | |
| } else { | |
| arr.push(num); | |
| return num; | |
| } | |
| }; | |
| for (let i=0; i < 11; i++) { | |
| fillArr(randNum(1, 20)); | |
| } | |
| const lineData = Array(10) | |
| .fill() | |
| .map((_, index) => graphData[arr[index]]); | |
| // set the ranges | |
| const x = d3.scaleTime().range([0, width]); | |
| const y = d3.scaleLinear().range([height, 0]); | |
| // define the area | |
| const area = d3.area() | |
| .x(d => x(d.date)) | |
| .y0(height) | |
| .y1(d => y(d.value)) | |
| .curve(d3.curveMonotoneX); | |
| // define the line | |
| const valueline = d3.line() | |
| .x(d => x(d.date)) | |
| .y(d => y(d.value)) | |
| .curve(d3.curveMonotoneX); | |
| // append the svg obgect to the body of the page | |
| const svg = d3.select("body") | |
| .append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", | |
| "translate(" + margin.left + "," + margin.top + ")"); | |
| // scale the range of the data | |
| x.domain(d3.extent(graphData, d => d.date)); | |
| y.domain([0, d3.max(graphData, d => d.value + 5)]); | |
| // add the X Axis | |
| svg.append("g") | |
| .attr("class", "x-axis") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(d3.axisBottom(x)); | |
| // add the Y Axis | |
| svg.append("g") | |
| .attr("class", "y-axis") | |
| .call(d3.axisLeft(y)); | |
| // Add grid | |
| svg.selectAll('.y-axis .tick line') | |
| .attr('stroke', '#E3E3E3') | |
| .attr('stroke-width', 1) | |
| .attr('x1', 0) | |
| .attr('x2', width); | |
| svg.selectAll('.x-axis .tick line') | |
| .attr('stroke', '#E3E3E3') | |
| .attr('stroke-width', 1) | |
| .attr('y1', 0) | |
| .attr('y2', -height) | |
| // add the area | |
| svg.append("path") | |
| .data([graphData]) | |
| .attr("class", "area") | |
| .attr("d", area); | |
| // add the valueline path. | |
| svg.append("path") | |
| .data([graphData]) | |
| .attr("class", "line") | |
| .attr("d", valueline); | |
| // Draw HZ line | |
| addLine(svg); | |
| // Draw Vert lines | |
| addVertLines(svg); | |
| function addVertLines(svg) { | |
| const vertLine = svg.selectAll('.issue') | |
| .data(lineData) | |
| .enter() | |
| .append('g') | |
| .attr('transform', d => `translate(${x(d.date)}, 0)`); | |
| vertLine.append('line') | |
| .attr('y1', 0) | |
| .attr('y2', height) | |
| .attr('class', 'issue__line'); | |
| } | |
| function addVertLine(pos) { | |
| svg.append("line") | |
| .attr("x1", x(today)) //<<== change your code here | |
| .attr("y1", 0) | |
| .attr("x2", x(today)) //<<== and here | |
| .attr("y2", height - margin.top - margin.bottom) | |
| .style("stroke-width", 2) | |
| .style("stroke", "red") | |
| .style("fill", "none"); | |
| } | |
| function addLine(svg) { | |
| const rectHeight = 20; | |
| const rectYoffset = -10; | |
| const rectXoffset = 0; | |
| const rectPadding = 10; | |
| // Add SLA element group and position | |
| const sla = svg.selectAll('.sla') | |
| .data([10]) | |
| .enter() | |
| .append('g') | |
| .attr('transform', d => `translate(-50, ${y(d)})`); | |
| // Add SLA line | |
| sla.append('line') | |
| .attr('x1', 0) | |
| .attr('x2', width + 50) | |
| .attr('class', 'sla__line'); | |
| // Add SLA label group (default position) | |
| const labelEl = sla.append('g'); | |
| // Position text box | |
| const rectEl = labelEl.append('rect') | |
| .attr('rx', '3') | |
| .attr('ry', '3') | |
| .attr('fill', '#F74C7D') | |
| .attr('height', rectHeight) | |
| .attr('transform', `translate(${rectXoffset}, ${-rectHeight - rectYoffset})`); | |
| // Position text | |
| const textEl = labelEl.append('text') | |
| .attr('class', 'sla__label') | |
| .text(d => `${d}ms`) | |
| .attr('dx', rectPadding / 2) | |
| .attr('dy', rectPadding / 2); | |
| // Read box width from text length | |
| rectEl | |
| .attr('width', textEl.node().getComputedTextLength() + rectPadding); | |
| } | |
| </script> | |
| </body> |
