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<!DOCTYPE html> |
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<svg width="960" height="500"></svg> |
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<script src="https://d3js.org/d3.v4.min.js"></script> |
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<style> |
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body { |
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margin: 0; |
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} |
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.high-low, .open, .close { |
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stroke-width: 2px; |
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} |
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.moving-average { |
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fill: none; |
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stroke: black; |
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stroke-width: 2px; |
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opacity: 0.5; |
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} |
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</style> |
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<script> |
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var svg = d3.select("svg"), |
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margin = {top: 75, right: 75, bottom: 75, left: 85}, |
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width = +svg.attr("width") - margin.left - margin.right, |
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height = +svg.attr("height") - margin.top - margin.bottom, |
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g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")"); |
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// parse day, abbreviated month name, year without century |
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var parseTime = d3.timeParse("%d-%b-%y"); |
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var tickSize = 3; |
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var x = d3.scaleTime() |
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.rangeRound([0, width]); |
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var y = d3.scaleLinear() |
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.rangeRound([height, 0]); |
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var line = d3.line(); |
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var highLowGenerator = function(d) { |
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var high = y(d.High); |
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var low = y(d.Low); |
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var time = x(d.Date); |
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return line([[time, high], [time, low]]); |
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}; |
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var openGenerator = function(d) { |
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var open = y(d.Open); |
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var time = x(d.Date); |
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return line([[time - tickSize, open],[time, open]]); |
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}; |
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var closeGenerator = function(d) { |
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var close = y(d.Close); |
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var time = x(d.Date); |
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return line([[time, close],[time + tickSize, close]]); |
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}; |
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var movingAverageGenerator = d3.line() |
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.x(function(d) { return x(d.Date); }) |
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.y(function(d) { return y(d.Average); }); |
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var colour = function(d) { |
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if (d.Close < d.Open) { |
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return "red"; |
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} else { |
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return "green"; |
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} |
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}; |
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d3.csv("twtr.csv", function(d) { |
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d.Date = parseTime(d.Date); |
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d.Open = +d.Open; |
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d.Close = +d.Close; |
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d.High = +d.High; |
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d.Low = +d.Low; |
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return d; |
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}, function(error, data) { |
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if (error) throw error; |
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data = data.slice(0, data.length / 2) |
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x.domain([d3.min(data, function(d) { return d.Date; }), |
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d3.max(data, function(d) { return d.Date; })]); |
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y.domain([Math.floor(d3.min(data, function(d) { return d.Low; })), |
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Math.ceil(d3.max(data, function(d) { return d.High; }))]); |
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data = data.slice(0, data.length - 1); |
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var ohlcs = g.append("g").attr("class", "ohlcs") |
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.selectAll("g") |
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.data(data) |
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.enter().append("g") |
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.attr("class", "ohlc"); |
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ohlcs.append("path") |
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.attr("class", "high-low") |
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.attr("d", highLowGenerator) |
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.attr("stroke", colour); |
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ohlcs.append("path") |
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.attr("class", "open") |
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.attr("d", openGenerator) |
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.attr("stroke", colour); |
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ohlcs.append("path") |
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.attr("class", "close") |
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.attr("d", closeGenerator) |
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.attr("stroke", colour); |
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var movingAverage = []; |
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var days = 5; |
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data.forEach(function(d, i) { |
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var total = 0; |
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var count = 0; |
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for (var n = 0; n < days; n++) { |
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if (data[i + n]) { |
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total += data[i + n].Close; |
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count++; |
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} |
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}; |
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var average = total / count; |
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var obj = { |
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"Date": d.Date, |
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"Average": average |
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} |
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movingAverage.push(obj); |
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}); |
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var movingAverageLine = g.append("g") |
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.attr("class", "moving-average") |
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.append("path") |
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.datum(movingAverage) |
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.attr("d", movingAverageGenerator); |
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var xAxis = g.append("g") |
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.attr("class", "x axis") |
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.attr("transform", "translate(0," + height + ")") |
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.style("font-family", "monospace") |
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.call(d3.axisBottom(x)); |
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var yAxis = g.append("g") |
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.attr("class", "y axis") |
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.style("font-family", "monospace") |
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.call(d3.axisLeft(y)); |
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g.append("text") |
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.attr("fill", "#000") |
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.attr("x", width / 2) |
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.attr("dy", -20) |
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.attr("text-anchor", "middle") |
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.style("font-family", "monospace") |
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.text("Stock Price ($)"); |
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// Add a small label for the symbol name. |
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g.append("text") |
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.attr("x", width - 30) |
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.attr("y", height - 25) |
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.style("text-anchor", "end") |
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.style("font-family", "monospace") |
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.style("font-size", "14") |
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.text("NYSE: TWTR"); |
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}); |
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</script> |