xxxxxxxxxx<html lang="en"> <head> <meta charset="utf-8"> <title>Tree Ring Widths for Northern and Southern Hemispheres, by Year</title> <script type="text/javascript" src="https://d3js.org/d3.v3.js"></script> <style type="text/css"> body { background-color: white; font-family: Helvetica, Arial, sans-serif; } h1 { font-size: 24px; margin: 0; } p { font-size: 14px; margin: 10px 0 0 0; } svg { background-color: white; } circle:hover { fill: orange; } .axis path, .axis line { fill: none; stroke: black; shape-rendering: crispEdges; } .axis text { font-family: sans-serif; font-size: 11px; } </style> </head> <body> <h1>Tree Ring Widths (in mm) for Northern and Southern Hemispheres, by Year</h1> <p>Tree ring widths measure the growth of trees over time; larger widths indicate a better growing season. Data are not available for all years. Source: <a href="https://www.ncdc.noaa.gov/paleo/treering.html">National Centers for Environmental Information</a>, 2014</p> <script type="text/javascript"> //Dimensions and padding var w = 1000; var h = 600; var padding = [ 20, 10, 50, 100 ]; //Top, right, bottom, left //Set up date formatting and years var dateFormat = d3.time.format("%Y"); //Set up scales var xScale = d3.time.scale() .range([ padding[3], w - padding[1] - padding[3] ]); var yScale = d3.scale.linear() .range([ padding[0], h - padding[2] ]); //Configure axis generators var xAxis = d3.svg.axis() .scale(xScale) .orient("bottom") .ticks(12) .tickFormat(function(d) { return dateFormat(d); }); var yAxis = d3.svg.axis() .scale(yScale) .orient("left"); //Configure line generator var line = d3.svg.line() .x(function(d) { return xScale(dateFormat.parse(d.Year)); }) .y(function(d) { return yScale(+d.TreeRingWidth); }); //Create the empty SVG image var svg = d3.select("body") .append("svg") .attr("width", w) .attr("height", h); //Load USA data d3.csv("TreeRingWidth_Northern.csv", function(NorthernData) { //Load China data d3.csv("TreeRingWidth_Southern.csv", function(SouthernData) { //Create a new array that contains both the //northern and southern hemisphere data, merged into one var mergedData = NorthernData.concat(SouthernData); //console.log(mergedData); //Use the newly merged data to determine the //min and max values, for setting scale domains xScale.domain([ d3.min(mergedData, function(d) { return dateFormat.parse(d.Year); }), d3.max(mergedData, function(d) { return dateFormat.parse(d.Year); }) ]); yScale.domain([ d3.max(mergedData, function(d) { return +d.TreeRingWidth; }), 860 ]); //Lines // // Note data is wrapped in another array, so all its // values are bound to a single element (the line!) // svg.data([ NorthernData ]) .append("path") .attr("class", "line northern") .attr("d", line) .attr("fill", "none") .attr("stroke", "steelblue") .attr("stroke-width", 2); svg.data([ SouthernData ]) .append("path") .attr("class", "line southern") .attr("d", line) .attr("fill", "none") .attr("stroke", "red") .attr("stroke-width", 2); //Axes svg.append("g") .attr("class", "x axis") .attr("transform", "translate(0," + (h - padding[2]) + ")") .call(xAxis); svg.append("g") .attr("class", "y axis") .attr("transform", "translate(" + (padding[3]) + ",0)") .call(yAxis); }); //End Southern data load function }); //End Northern data load function </script> </body></html> Modified http://d3js.org/d3.v3.js to a secure url
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