This code example is the result of the Module 3's exercise from the course “Data Visualization and Infographics with D3,” taught by Alberto Cairo and Scott Murray, and offered through the Knight Center for Journalism in the Americas at UT Austin. http://bl.ocks.org/nadeschda/ff6cac1d3d273584b1e3
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Science Comm 16: Bar chart adding legend
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <html> | |
| <head> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://labratrevenge.com/d3-tip/javascripts/d3.tip.v0.6.3.js"></script> | |
| <style> | |
| body { | |
| font: 16px sans-serif; | |
| font-weight: bold; | |
| } | |
| .bar { | |
| fill: steelblue; | |
| } | |
| .bar:hover { | |
| fill: purple; | |
| } | |
| .axis { | |
| font: 10px sans-serif; | |
| } | |
| .axis path, /* path refers to a line */ | |
| .axis line { | |
| fill: none; | |
| stroke: #000; | |
| shape-rendering: crispEdges; | |
| } | |
| .x.axis path { | |
| display: none; | |
| } | |
| .title { | |
| font: 20px sans-serif; | |
| font-weight: bold; | |
| } | |
| /*css for legend*/ | |
| div.legend-container { | |
| position: absolute; | |
| left: 550px; | |
| top: 30px; | |
| background-color: #fff; | |
| } | |
| .legend { | |
| stroke: #d9d9d9; | |
| stroke-width: 2; | |
| fill: none; | |
| } | |
| p { | |
| width: 300px; | |
| font-size: 11px; | |
| color: #7b4173; | |
| margin: 10px; | |
| position: absolute; | |
| top: 70px; | |
| } | |
| a { | |
| text-decoration: none; | |
| color: #969696; | |
| display: block; | |
| margin: 10px 0; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| var margin = { | |
| top: 30, | |
| left: 65, | |
| right: 10, | |
| bottom: 50 | |
| } | |
| height = 400 - margin.top - margin.bottom | |
| width = 550 - margin.left - margin.right | |
| var svg = d3.select("body").append("svg") | |
| .attr("height", height + margin.top + margin.bottom) | |
| .attr("width", width + margin.left + margin.right) | |
| .append("g") //investigate the effects of removing this | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| //xAxis | |
| var xScale = d3.scale.ordinal() | |
| .rangeRoundBands([width,0], .1); | |
| var xAxis = d3.svg.axis() | |
| .scale(xScale) | |
| .orient("bottom"); | |
| var yScale = d3.scale.linear() | |
| .range([height,0]) | |
| var yAxis = d3.svg.axis() | |
| .scale(yScale) | |
| .orient("left"); | |
| //lEGEND | |
| legendDIV = d3.select("body") | |
| .append("div") | |
| .attr("class", "legend-container"); | |
| p = legendDIV.append("p") | |
| .text("Net receipts from transit trading in Switzerland grew tenfold between 2003 and 2011, from CHF 2 billion to CHF 20 billion. In 2010, trading replaced Swiss banks’ financial services as the country’s top services export, and its share of Swiss GDP (over 3%) eclipsed that of tourism."); | |
| p.append("a") | |
| .attr("href", "https://de.wikipedia.org/wiki/Transithandel") | |
| .attr("target", "_blank") | |
| .text("What is transit trade?"); | |
| p.append("a") | |
| .attr("href", "http://www.snb.ch/en/iabout/stat/statpub/bop/id/statpub_bop_desc") | |
| .attr("target", "_blank") | |
| .text("Link to data source"); | |
| legendSVG = legendDIV.append("svg") | |
| .attr("width", width / 3) | |
| .attr("height", height / 2) | |
| .style("background-color", "transparent") | |
| .append("g"); | |
| legendSVG.append("polyline") | |
| .attr("points", "22,14 2,14 2,290") | |
| .attr("class", "legend"); | |
| legendSVG.append("text") | |
| .attr("x", 26) | |
| .attr("y", 20) | |
| .text(function(d) { | |
| return "Legend"; | |
| }) | |
| .attr("font-size", "16"); | |
| legendSVG.append("rect") | |
| .attr("class", "bar") | |
| .attr("x", 10) | |
| .attr("y", 40) | |
| .attr("width", 20) | |
| .attr("height", 20); | |
| legendSVG.append("text") | |
| .attr("x", 35) | |
| .attr("y", 56) | |
| .text(function(d) { | |
| return "transit trade"; | |
| }) | |
| .attr("font-size", "12"); | |
| d3.csv("ttrade.csv",type, function(data) { | |
| xScale.domain(data.map(function(d) {return d.year;})); | |
| yScale.domain([0, d3.max(data, function(d) { return +d.ttrade; } )]); //or use yScale.domain([0, 20000]); | |
| //xAxis | |
| svg.append("g") | |
| .attr("class","x axis") | |
| .attr("transform", "translate(0," + height + ")") | |
| .call(xAxis) | |
| .selectAll("text") | |
| .style("text-anchor", "end") | |
| .attr("dx", "-.8em") | |
| .attr("dy", ".15em") | |
| .attr("transform", "rotate(-35)"); | |
| //yAxis | |
| svg.append("g") | |
| .attr("class","y axis") | |
| .call(yAxis); | |
| //x axis label | |
| svg.append("text") | |
| .attr("x", width/2) | |
| .attr("y", height + margin.bottom) | |
| .text("Year"); | |
| //y axis label | |
| svg.append("text") | |
| .attr("transform", "rotate(-90)") | |
| //NOTE - we actually rotate our reference point by 90 degrees | |
| //http://www.d3noob.org/2012/12/adding-axis-labels-to-d3js-graph.html gives more detail | |
| .attr("y", 0 - margin.left) | |
| .attr("x",0 - (height / 2)) | |
| .attr("dy", "1em") | |
| .style("text-anchor", "middle") | |
| .text("Revenue in Mio. CHF"); | |
| //title | |
| svg.append("g") | |
| .attr("class","title") | |
| .append("text") | |
| .attr("x", width/2) | |
| .attr("y", (margin.top / 2)) | |
| .attr("text-anchor", "middle") | |
| .text("Commodity transit trade") | |
| svg.selectAll(".bar") | |
| .data(data) | |
| .enter() | |
| .append("rect") | |
| .attr("class", "bar") | |
| .attr("x", function(d) {return xScale(d.year);}) | |
| .attr("y", function(d) {return yScale(d.ttrade); }) | |
| .attr("width",xScale.rangeBand()) | |
| .attr("height", function (d) {return height - yScale(d.ttrade); }) | |
| }); | |
| function type(d) { | |
| d.ttrade = d.ttrade; | |
| return d; | |
| } | |
| </script> | |
| </body> | |
| </html> |
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| year | ttrade | |
|---|---|---|
| 2011 | 19766 | |
| 2010 | 19827 | |
| 2009 | 14422 | |
| 2008 | 14445 | |
| 2007 | 10716 | |
| 2006 | 8811 | |
| 2005 | 5862 | |
| 2004 | 4552 | |
| 2003 | 2444 |
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