An interactive multi-line chart.
Note, I borrowed a bit of code from Duopixel's excellent code sample here.
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Last active
November 24, 2023 12:04
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d3 mouseover multi-line chart
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script data-require="[email protected]" data-semver="3.5.3" src="//cdnjs.cloudflare.com/ajax/libs/d3/3.5.3/d3.js"></script> | |
| <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> | |
| </head> | |
| <body> | |
| <script> | |
| var myData = "date New York San Francisco Austin\n\ | |
| 20111001 63.4 62.7 72.2\n\ | |
| 20111002 58.0 59.9 67.7\n\ | |
| 20111003 53.3 59.1 69.4\n\ | |
| 20111004 55.7 58.8 68.0\n\ | |
| 20111005 64.2 58.7 72.4\n\ | |
| 20111006 58.8 57.0 77.0\n\ | |
| 20111007 57.9 56.7 82.3\n\ | |
| 20111008 61.8 56.8 78.9\n\ | |
| 20111009 69.3 56.7 68.8\n\ | |
| 20111010 71.2 60.1 68.7\n\ | |
| 20111011 68.7 61.1 70.3\n\ | |
| 20111012 61.8 61.5 75.3\n\ | |
| 20111013 63.0 64.3 76.6\n\ | |
| 20111014 66.9 67.1 66.6\n\ | |
| 20111015 61.7 64.6 68.0\n\ | |
| 20111016 61.8 61.6 70.6\n\ | |
| 20111017 62.8 61.1 71.1\n\ | |
| 20111018 60.8 59.2 70.0\n\ | |
| 20111019 62.1 58.9 61.6\n\ | |
| 20111020 65.1 57.2 57.4\n\ | |
| 20111021 55.6 56.4 64.3\n\ | |
| 20111022 54.4 60.7 72.4\n"; | |
| var margin = { | |
| top: 20, | |
| right: 80, | |
| bottom: 30, | |
| left: 50 | |
| }, | |
| width = 900 - margin.left - margin.right, | |
| height = 500 - margin.top - margin.bottom; | |
| var parseDate = d3.time.format("%Y%m%d").parse; | |
| var x = d3.time.scale() | |
| .range([0, width]); | |
| var y = d3.scale.linear() | |
| .range([height, 0]); | |
| var color = d3.scale.category10(); | |
| var xAxis = d3.svg.axis() | |
| .scale(x) | |
| .orient("bottom"); | |
| var yAxis = d3.svg.axis() | |
| .scale(y) | |
| .orient("left"); | |
| var line = d3.svg.line() | |
| .interpolate("basis") | |
| .x(function(d) { | |
| return x(d.date); | |
| }) | |
| .y(function(d) { | |
| return y(d.temperature); | |
| }); | |
| 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 + ")"); | |
| var data = d3.tsv.parse(myData); | |
| color.domain(d3.keys(data[0]).filter(function(key) { | |
| return key !== "date"; | |
| })); | |
| data.forEach(function(d) { | |
| d.date = parseDate(d.date); | |
| }); | |
| var cities = color.domain().map(function(name) { | |
| return { | |
| name: name, | |
| values: data.map(function(d) { | |
| return { | |
| date: d.date, | |
| temperature: +d[name] | |
| }; | |
| }) | |
| }; | |
| }); | |
| x.domain(d3.extent(data, function(d) { | |
| return d.date; | |
| })); | |
| y.domain([ | |
| d3.min(cities, function(c) { | |
| return d3.min(c.values, function(v) { | |
| return v.temperature; | |
| }); | |
| }), | |
| d3.max(cities, function(c) { | |
| return d3.max(c.values, function(v) { | |
| return v.temperature; | |
| }); | |
| }) | |
| ]); | |
| var legend = svg.selectAll('g') | |
| .data(cities) | |
| .enter() | |
| .append('g') | |
| .attr('class', 'legend'); | |
| legend.append('rect') | |
| .attr('x', width - 20) | |
| .attr('y', function(d, i) { | |
| return i * 20; | |
| }) | |
| .attr('width', 10) | |
| .attr('height', 10) | |
| .style('fill', function(d) { | |
| return color(d.name); | |
| }); | |
| legend.append('text') | |
| .attr('x', width - 8) | |
| .attr('y', function(d, i) { | |
| return (i * 20) + 9; | |
| }) | |
| .text(function(d) { | |
| return d.name; | |
| }); | |
| 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("Temperature (ºF)"); | |
| var city = svg.selectAll(".city") | |
| .data(cities) | |
| .enter().append("g") | |
| .attr("class", "city"); | |
| city.append("path") | |
| .attr("class", "line") | |
| .attr("d", function(d) { | |
| return line(d.values); | |
| }) | |
| .style("stroke", function(d) { | |
| return color(d.name); | |
| }); | |
| city.append("text") | |
| .datum(function(d) { | |
| return { | |
| name: d.name, | |
| value: d.values[d.values.length - 1] | |
| }; | |
| }) | |
| .attr("transform", function(d) { | |
| return "translate(" + x(d.value.date) + "," + y(d.value.temperature) + ")"; | |
| }) | |
| .attr("x", 3) | |
| .attr("dy", ".35em") | |
| .text(function(d) { | |
| return d.name; | |
| }); | |
| var mouseG = svg.append("g") | |
| .attr("class", "mouse-over-effects"); | |
| mouseG.append("path") // this is the black vertical line to follow mouse | |
| .attr("class", "mouse-line") | |
| .style("stroke", "black") | |
| .style("stroke-width", "1px") | |
| .style("opacity", "0"); | |
| var lines = document.getElementsByClassName('line'); | |
| var mousePerLine = mouseG.selectAll('.mouse-per-line') | |
| .data(cities) | |
| .enter() | |
| .append("g") | |
| .attr("class", "mouse-per-line"); | |
| mousePerLine.append("circle") | |
| .attr("r", 7) | |
| .style("stroke", function(d) { | |
| return color(d.name); | |
| }) | |
| .style("fill", "none") | |
| .style("stroke-width", "1px") | |
| .style("opacity", "0"); | |
| mousePerLine.append("text") | |
| .attr("transform", "translate(10,3)"); | |
| mouseG.append('svg:rect') // append a rect to catch mouse movements on canvas | |
| .attr('width', width) // can't catch mouse events on a g element | |
| .attr('height', height) | |
| .attr('fill', 'none') | |
| .attr('pointer-events', 'all') | |
| .on('mouseout', function() { // on mouse out hide line, circles and text | |
| d3.select(".mouse-line") | |
| .style("opacity", "0"); | |
| d3.selectAll(".mouse-per-line circle") | |
| .style("opacity", "0"); | |
| d3.selectAll(".mouse-per-line text") | |
| .style("opacity", "0"); | |
| }) | |
| .on('mouseover', function() { // on mouse in show line, circles and text | |
| d3.select(".mouse-line") | |
| .style("opacity", "1"); | |
| d3.selectAll(".mouse-per-line circle") | |
| .style("opacity", "1"); | |
| d3.selectAll(".mouse-per-line text") | |
| .style("opacity", "1"); | |
| }) | |
| .on('mousemove', function() { // mouse moving over canvas | |
| var mouse = d3.mouse(this); | |
| d3.select(".mouse-line") | |
| .attr("d", function() { | |
| var d = "M" + mouse[0] + "," + height; | |
| d += " " + mouse[0] + "," + 0; | |
| return d; | |
| }); | |
| d3.selectAll(".mouse-per-line") | |
| .attr("transform", function(d, i) { | |
| console.log(width/mouse[0]) | |
| var xDate = x.invert(mouse[0]), | |
| bisect = d3.bisector(function(d) { return d.date; }).right; | |
| idx = bisect(d.values, xDate); | |
| var beginning = 0, | |
| end = lines[i].getTotalLength(), | |
| target = null; | |
| while (true){ | |
| target = Math.floor((beginning + end) / 2); | |
| pos = lines[i].getPointAtLength(target); | |
| if ((target === end || target === beginning) && pos.x !== mouse[0]) { | |
| break; | |
| } | |
| if (pos.x > mouse[0]) end = target; | |
| else if (pos.x < mouse[0]) beginning = target; | |
| else break; //position found | |
| } | |
| d3.select(this).select('text') | |
| .text(y.invert(pos.y).toFixed(2)); | |
| return "translate(" + mouse[0] + "," + pos.y +")"; | |
| }); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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