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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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.line { |
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fill: none; |
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stroke: steelblue; |
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stroke-width: 2px; |
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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 and margins of the graph |
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var margin = {top: 20, right: 20, bottom: 30, left: 50}, |
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width = 960 - margin.left - margin.right, |
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height = 500 - margin.top - margin.bottom; |
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// parse the date / time |
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var parseTime = d3.timeParse("%d-%b-%y"); |
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bisectDate = d3.bisector(function(d) { return d.date; }).left; |
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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 valueline = d3.line() |
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.x(function(d) { return x(d.date); }) |
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.y(function(d) { return y(d.close); }); |
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// append the svg obgect to the body of the page |
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// appends a 'group' element to 'svg' |
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// moves the 'group' element to the top left margin |
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var svg = d3.select("body").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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var lineSvg = svg.append("g"); |
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var focus = svg.append("g") |
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.style("display", "none"); |
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// Get the data |
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d3.csv("atad.csv").then(function(data) { |
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// format the data |
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data.forEach(function(d) { |
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d.date = parseTime(d.date); |
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d.close = +d.close; |
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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.close; })]); |
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// Add the valueline path. |
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lineSvg.append("path") |
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.data([data]) |
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.attr("class", "line") |
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.attr("d", valueline); |
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// Add the X Axis |
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svg.append("g") |
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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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.call(d3.axisLeft(y)); |
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// append the circle at the intersection |
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focus.append("circle") |
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.attr("class", "y") |
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.style("fill", "none") |
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.style("stroke", "blue") |
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.attr("r", 4); |
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// append the rectangle to capture mouse |
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svg.append("rect") |
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.attr("width", width) |
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.attr("height", height) |
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.style("fill", "none") |
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.style("pointer-events", "all") |
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.on("mouseover", function() { focus.style("display", null); }) |
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.on("mouseout", function() { focus.style("display", "none"); }) |
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.on("mousemove", mousemove); |
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function mousemove() { |
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var x0 = x.invert(d3.mouse(this)[0]), |
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i = bisectDate(data, x0, 1), |
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d0 = data[i - 1], |
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d1 = data[i], |
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d = x0 - d0.date > d1.date - x0 ? d1 : d0; |
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focus.select("circle.y") |
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.attr("transform", |
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"translate(" + x(d.date) + "," + |
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y(d.close) + ")"); |
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} |
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}); |
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</script> |
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</body> |
