| license: gpl-3.0 |
This simple bar chart is constructed from a TSV file storing the frequency of letters in the English language. The chart employs conventional margins and a number of D3 features:
| letter | frequency | |
|---|---|---|
| A | .08167 | |
| B | .01492 | |
| C | .02782 | |
| D | .04253 | |
| E | .12702 | |
| F | .02288 | |
| G | .02015 | |
| H | .06094 | |
| I | .06966 | |
| J | .00153 | |
| K | .00772 | |
| L | .04025 | |
| M | .02406 | |
| N | .06749 | |
| O | .07507 | |
| P | .01929 | |
| Q | .00095 | |
| R | .05987 | |
| S | .06327 | |
| T | .09056 | |
| U | .02758 | |
| V | .00978 | |
| W | .02360 | |
| X | .00150 | |
| Y | .01974 | |
| Z | .00074 |
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .bar { | |
| fill: steelblue; | |
| } | |
| .bar:hover { | |
| fill: rgb(150,165,180); | |
| } | |
| .axis { | |
| font: 10px sans-serif; | |
| fill: white; | |
| } | |
| .axis path, | |
| .axis line { | |
| fill: none; | |
| stroke: white; | |
| shape-rendering: crispEdges; | |
| } | |
| .x.axis path { | |
| display: none; | |
| } | |
| body { | |
| background-color: rgb(50, 60, 70); | |
| color: white; | |
| } | |
| .x.axis { | |
| color: white; | |
| } | |
| .tooltip { | |
| background-color: rgba(160, 170, 187, 0.5); | |
| margin: 10px; | |
| height: 70px; | |
| width: 200px; | |
| padding-left: 10px; | |
| padding-top: 10px; | |
| -webkit-border-radius: 10px; | |
| -moz-border-radius: 10px; | |
| border-radius: 10px; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script type="text/javascript" src="tooltips.js"></script> | |
| <script> | |
| var margin = {top: 20, right: 20, bottom: 30, left: 40}, | |
| width = 960 - margin.left - margin.right, | |
| height = 500 - margin.top - margin.bottom; | |
| var x = d3.scale.ordinal() | |
| .rangeRoundBands([0, width], .1); | |
| 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") | |
| .ticks(10, "%"); | |
| 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.tsv", type, function(error, data) { | |
| if (error) throw error; | |
| x.domain(data.map(function(d) { return d.letter; })); | |
| y.domain([0, d3.max(data, function(d) { return d.frequency; })]); | |
| 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("Frequency"); | |
| svg.selectAll(".bar") | |
| .data(data) | |
| .enter().append("rect") | |
| .attr("class", "bar") | |
| .attr("x", function(d) { return x(d.letter); }) | |
| .attr("width", x.rangeBand()) | |
| .attr("y", function(d) { return y(d.frequency); }) | |
| .attr("height", function(d) { return height - y(d.frequency); }) | |
| .call(d3.helper.tooltip(function (d) {return "letter: <b>" + d.letter + "</b><br/>frequency: " + d.frequency;})); | |
| }); | |
| function type(d) { | |
| d.frequency = +d.frequency; | |
| return d; | |
| } | |
| </script> |
| d3.helper = {}; | |
| d3.helper.tooltip = function (accessor) { | |
| return function (selection) { | |
| var tooltipDiv; | |
| var bodyNode = d3.select('body').node(); | |
| selection.on("mouseover", function (d, i) { | |
| // Clean up lost tooltips | |
| d3.select('body').selectAll('div.tooltip').remove(); | |
| // Append tooltip | |
| tooltipDiv = d3.select('body').append('div').attr('class', 'tooltip'); | |
| var absoluteMousePos = d3.mouse(bodyNode); | |
| tooltipDiv.style('left', (absoluteMousePos[0] + 10) + 'px') | |
| .style('top', (absoluteMousePos[1] - 15) + 'px') | |
| .style('position', 'absolute') | |
| .style('z-index', 1001); | |
| // Add text using the accessor function | |
| var tooltipText = accessor(d, i) || ''; | |
| // Crop text arbitrarily | |
| //tooltipDiv.style('width', function(d, i){return (tooltipText.length > 80) ? '300px' : null;}) | |
| // .html(tooltipText); | |
| }) | |
| .on('mousemove', function (d, i) { | |
| // Move tooltip | |
| var absoluteMousePos = d3.mouse(bodyNode); | |
| tooltipDiv.style('left', (absoluteMousePos[0] + 10) + 'px') | |
| .style('top', (absoluteMousePos[1] - 15) + 'px'); | |
| var tooltipText = accessor(d, i) || ''; | |
| tooltipDiv.html(tooltipText); | |
| }) | |
| .on("mouseout", function (d, i) { | |
| // Remove tooltip | |
| tooltipDiv.remove(); | |
| }); | |
| }; | |
| }; |