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<!DOCTYPE html> |
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<meta charset="utf-8"> |
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<style> /* set the CSS */ |
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body { font: 12px Arial;} |
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path { |
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stroke: steelblue; |
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stroke-width: 2; |
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fill: none; |
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} |
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.axis path, |
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.axis line { |
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fill: none; |
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stroke: grey; |
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stroke-width: 1; |
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shape-rendering: crispEdges; |
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} |
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.legend { |
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font-size: 16px; |
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font-weight: bold; |
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text-anchor: middle; |
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} |
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</style> |
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<body> |
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<!-- load the d3.js library --> |
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<script src="https://d3js.org/d3.v5.min.js"></script> |
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<script> |
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// Set the dimensions of the canvas / graph |
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var margin = {top: 30, right: 20, bottom: 70, left: 50}, |
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width = 600 - margin.left - margin.right, |
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height = 300 - margin.top - margin.bottom; |
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// Parse the date / time |
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var parseDate = d3.timeParse("%b %Y"); |
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// Set the ranges |
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var x = d3.scaleTime().range([0, width]); |
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var y = d3.scaleLinear().range([height, 0]); |
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// Define the line |
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var priceline = d3.line() |
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.x(function(d) { return x(d.date); }) |
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.y(function(d) { return y(d.price); }); |
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// Adds the svg canvas |
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var svg = d3.select("body") |
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.append("svg") |
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.attr("width", width + margin.left + margin.right) |
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.attr("height", height + margin.top + margin.bottom) |
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.append("g") |
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.attr("transform", |
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"translate(" + margin.left + "," + margin.top + ")"); |
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// Get the data |
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d3.csv("stocks.csv").then(function(data) { |
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data.forEach(function(d) { |
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d.date = parseDate(d.date); |
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d.price = +d.price; |
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}); |
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// Scale the range of the data |
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x.domain(d3.extent(data, function(d) { return d.date; })); |
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y.domain([0, d3.max(data, function(d) { return d.price; })]); |
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// Nest the entries by symbol |
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var dataNest = d3.nest() |
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.key(function(d) {return d.symbol;}) |
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.entries(data); |
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// set the colour scale |
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var color = d3.scaleOrdinal(d3.schemeCategory10); |
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legendSpace = width/dataNest.length; // spacing for the legend |
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// Loop through each symbol / key |
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dataNest.forEach(function(d,i) { |
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svg.append("path") |
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.attr("class", "line") |
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.style("stroke", function() { // Add the colours dynamically |
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return d.color = color(d.key); }) |
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.attr("id", 'tag'+d.key.replace(/\s+/g, '')) // assign an ID |
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.attr("d", priceline(d.values)); |
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// Add the Legend |
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svg.append("text") |
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.attr("x", (legendSpace/2)+i*legendSpace) // space legend |
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.attr("y", height + (margin.bottom/2)+ 5) |
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.attr("class", "legend") // style the legend |
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.style("fill", function() { // Add the colours dynamically |
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return d.color = color(d.key); }) |
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.on("click", function(){ |
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// Determine if current line is visible |
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var active = d.active ? false : true, |
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newOpacity = active ? 0 : 1; |
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// Hide or show the elements based on the ID |
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d3.select("#tag"+d.key.replace(/\s+/g, '')) |
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.transition().duration(100) |
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.style("opacity", newOpacity); |
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// Update whether or not the elements are active |
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d.active = active; |
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}) |
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.text(d.key); |
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}); |
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// Add the X Axis |
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svg.append("g") |
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.attr("class", "axis") |
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.attr("transform", "translate(0," + height + ")") |
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.call(d3.axisBottom(x)); |
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// Add the Y Axis |
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svg.append("g") |
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.attr("class", "axis") |
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.call(d3.axisLeft(y)); |
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}); |
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</script> |
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</body> |
