This simple line chart is constructed from a TSV file storing the closing value of AAPL stock over the last few years. The chart employs conventional margins and a number of D3 features:
| { | |
| "close": [ | |
| 582.13, | |
| 583.98, | |
| 603.00, | |
| 607.70, | |
| 610.00, | |
| 560.28, | |
| 571.70, | |
| 572.98, | |
| 587.44, | |
| 608.34 | |
| ], | |
| "date": [ | |
| "02:30:00", | |
| "02:45:00", | |
| "03:00:00", | |
| "03:15:00", | |
| "03:30:00", | |
| "03:45:00", | |
| "04:00:00", | |
| "04:15:00", | |
| "04:30:00", | |
| "04:45:00", | |
| "05:00:00" | |
| ] | |
| } |
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| font: 10px sans-serif; | |
| } | |
| .axis path, | |
| .axis line { | |
| fill: none; | |
| stroke: #000; | |
| shape-rendering: crispEdges; | |
| } | |
| .x.axis path { | |
| display: none; | |
| } | |
| .line { | |
| fill: none; | |
| stroke: steelblue; | |
| stroke-width: 1.5px; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.js"></script> | |
| <script> | |
| var margin = {top: 20, right: 20, bottom: 30, left: 50}, | |
| width = 960 - margin.left - margin.right, | |
| height = 500 - margin.top - margin.bottom; | |
| // You have times instead of dates. So we need a time formatter. | |
| var parseTime = d3.time.format("%H:%M:%S").parse; | |
| var x = d3.time.scale() | |
| .range([0, width]); | |
| var y = d3.scale.linear() | |
| .range([height, 0]); | |
| var xAxis = d3.svg.axis() | |
| .scale(x) | |
| .orient("bottom"); | |
| var yAxis = d3.svg.axis() | |
| .scale(y) | |
| .orient("left"); | |
| var line = d3.svg.line() | |
| .x(function(d) { return x(d.date); }) | |
| .y(function(d) { return y(d.close); }); | |
| var 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 + ")"); | |
| d3.json("data.json", function(error, data) { | |
| // 1) Zip the close value with their corresponding date/time | |
| // Results in an array of arrays: | |
| // | |
| // [[582.13, "02:30:00"], [583.98, "02:45:00"], ...] | |
| // | |
| data = d3.zip(data.close, data.date).map(function(d) { | |
| // 2) Format each close and date/time value so d3 understands what each represents. | |
| close = +d[0]; | |
| // If your data source can't be changed at all, I'd rename `date` to `time` here. | |
| date = parseTime(d[1]); | |
| // 3) Return an object for each close and date/time pair. | |
| return {close: close, date: date}; | |
| }); | |
| x.domain(d3.extent(data, function(d) { return d.date; })); | |
| y.domain(d3.extent(data, function(d) { return d.close; })); | |
| svg.append("g") | |
| .attr("class", "x axis") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(xAxis); | |
| svg.append("g") | |
| .attr("class", "y axis") | |
| .call(yAxis) | |
| .append("text") | |
| .attr("transform", "rotate(-90)") | |
| .attr("y", 6) | |
| .attr("dy", ".71em") | |
| .style("text-anchor", "end") | |
| .text("Price ($)"); | |
| svg.append("path") | |
| .datum(data) | |
| .attr("class", "line") | |
| .attr("d", line); | |
| }); | |
| </script> |