A line chart with mouseover so that you can read the y-value based on the closest x-value. The x-value is found using d3.mouse and scale.invert. The y-value is then found by bisecting the data.
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X-Mouseover with Basis line
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| date | close | |
|---|---|---|
| 1-May-12 | 582.13 | |
| 30-Apr-12 | 583.98 | |
| 27-Apr-12 | 603.00 | |
| 26-Apr-12 | 607.70 | |
| 25-Apr-12 | 610.00 | |
| 24-Apr-12 | 560.28 | |
| 23-Apr-12 | 571.70 | |
| 20-Apr-12 | 572.98 | |
| 19-Apr-12 | 587.44 | |
| 18-Apr-12 | 608.34 | |
| 17-Apr-12 | 609.70 | |
| 16-Apr-12 | 580.13 | |
| 13-Apr-12 | 605.23 | |
| 12-Apr-12 | 622.77 | |
| 11-Apr-12 | 626.20 |
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| <!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; | |
| } | |
| .overlay { | |
| fill: none; | |
| pointer-events: all; | |
| } | |
| .focus circle { | |
| fill: none; | |
| stroke: steelblue; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.js"></script> | |
| <script> | |
| var margin = {top: 20, right: 50, bottom: 30, left: 50}, | |
| width = 960 - margin.left - margin.right, | |
| height = 500 - margin.top - margin.bottom; | |
| var parseDate = d3.time.format("%d-%b-%y").parse, | |
| bisectDate = d3.bisector(function(d) { return d.date; }).left, | |
| formatValue = d3.format(",.2f"), | |
| formatCurrency = function(d) { return "$" + formatValue(d); }; | |
| var x = d3.time.scale() | |
| .range([0, width]); | |
| var y = d3.scale.linear() | |
| .range([height, 0]); | |
| var xAxis = d3.svg.axis() | |
| .scale(x) | |
| .orient("bottom"); | |
| var yAxis = d3.svg.axis() | |
| .scale(y) | |
| .orient("left"); | |
| var line = d3.svg.line() | |
| .x(function(d) { return x(d.date); }) | |
| .y(function(d) { return y(d.close); }) | |
| .interpolate('basis'); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| d3.tsv("data-small.tsv", function(error, data) { | |
| data.forEach(function(d) { | |
| d.date = parseDate(d.date); | |
| d.close = +d.close; | |
| }); | |
| data.sort(function(a, b) { | |
| return a.date - b.date; | |
| }); | |
| x.domain([data[0].date, data[data.length - 1].date]); | |
| y.domain(d3.extent(data, function(d) { return d.close; })); | |
| svg.append("g") | |
| .attr("class", "x axis") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(xAxis); | |
| svg.append("g") | |
| .attr("class", "y axis") | |
| .call(yAxis) | |
| .append("text") | |
| .attr("transform", "rotate(-90)") | |
| .attr("y", 6) | |
| .attr("dy", ".71em") | |
| .style("text-anchor", "end") | |
| .text("Price ($)"); | |
| svg.append("path") | |
| .datum(data) | |
| .attr("class", "line") | |
| .attr("d", line); | |
| var focus = svg.append("g") | |
| .attr("class", "focus") | |
| .style("display", "none"); | |
| focus.append("circle") | |
| .attr("r", 4.5); | |
| focus.append("text") | |
| .attr("x", 9) | |
| .attr("dy", ".35em"); | |
| svg.append("rect") | |
| .attr("class", "overlay") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .on("mouseover", function() { focus.style("display", null); }) | |
| .on("mouseout", function() { focus.style("display", "none"); }) | |
| .on("mousemove", mousemove); | |
| function mousemove() { | |
| var x0 = x.invert(d3.mouse(this)[0]), | |
| i = bisectDate(data, x0, 1), | |
| d0 = data[i - 1], | |
| d1 = data[i], | |
| d = x0 - d0.date > d1.date - x0 ? d1 : d0; | |
| focus.attr("transform", "translate(" + x(d.date) + "," + y(d.close) + ")"); | |
| focus.select("text").text(formatCurrency(d.close)); | |
| } | |
| }); | |
| </script> |
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