D3 Examples - nations-scatterplot-nested

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<!DOCTYPE html>
<head>
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
      body { 
        margin: 0;
        position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
    }
​
    .title {
      font-family: "Georgia";
      font-size: 32px;
      fill: #000;
    }
​
    .axis {
      font-family: "Arial";
      font-size: 11px;
      fill: #808080;
    }
​
    .circle {
      fill: pink;
      fill-opacity: 0.5;
      stroke: #c0c0c0;
    }
​
    .nation > text {
      font-family: Arial, Verdana, Tahoma;
      font-size: 11px;
      fill: #555;
    }
  </style>
</head>
<body>
  <script>
    d3.json("nations.json", function(error, json) {
      if (error) throw error;
​
      // variables
      var data = json;
      console.log(data);
      var width = 960;
      var height = 500;
      var margin = { top: 75, right: 30, bottom: 20, left: 30 };
​
      // min-max
      var xExtent = d3.extent(data, function(d) { return d.income });
      var yExtent = d3.extent(data, function(d) { return d.lifeExpectancy });
​
      // scales
      var xScaleLinear = d3.scaleLinear()
        .domain(xExtent)
        .range([margin.left, width - margin.right]);
      var xScaleLog = d3.scaleLog()
        .domain(xExtent)
        .range([margin.left, width - margin.right]);
      var xScale = xScaleLinear;
      var yScale = d3.scaleLinear()
        .domain(yExtent)
        .range([height - margin.bottom, margin.top]);
​
      // axes
      var xAxis = d3.axisBottom()
        .scale(xScale);
      var yAxis = d3.axisLeft()
        .scale(yScale);
​
      // svg
      var svg = d3.select("body")
        .append("svg")
        .attr("width", width)
        .attr("height", height);
​
      var group = svg.selectAll("g")
        .data(data, function(d) { return d.name });
​
      // exit
      group.exit().remove();
​
      // enter and update
      group = group.enter().append("g")
        .classed("nation", true)
        .merge(group);
      group.append("circle");
      group.append("text");
​
      group.select("circle")
        .attr("cx", function(d) { return xScale(d.income); })
        .attr("cy", function(d) { return yScale(d.lifeExpectancy); })
        .attr("r", 7)
        .attr("class", "circle");
      group.select("text")
        .attr("x", function(d) { return (xScale(d.income) + 3); })
        .attr("y", function(d) { return yScale(d.lifeExpectancy); })
        .text(function(d) { return d.name; });
​
      // axes
      var axisX = svg.append("g")
        .call(xAxis)
        .attr("transform", "translate(" + [0, height - margin.bottom] + ")");
​
      var axisY = svg.append("g")
        .call(yAxis)        
        .attr("transform", "translate(" + [margin.left, 0] + ")");
​
​
      // titles
      var title = svg.append("text")
        .text("The Health and Wealth of Nations, 2009")
        .attr("class", "title")
        .attr("transform", "translate(" + [margin.left + width * 0.5, margin.top * 0.65] + ")")
        .attr("text-anchor", "middle")
        .attr("fill", "#000");
      var xTitle = axisX.append("text")
        .text("income per capita (dollars)")
        .attr("transform", "translate(" + [width - margin.right, 0 - margin.bottom / 2] + ")")
        .attr("text-anchor", "end")
        .attr("class", "axis");
      var yTitle = axisY.append("text")
        .text("life expectancy (years)")
        .attr("transform", "translate(" + [margin.left * 0.5, margin.top] + ") rotate(" + -90 + ")")
        .attr("class", "axis"); 
​
      d3.select("svg")
        .on("click", function() {
          if (xScale == xScaleLinear) {
            xScale = xScaleLog;
            xAxis.scale(xScale).ticks(10, ".0f");
            xTitle.text("income per capita, inflation adjusted (dollars)");
          } else if (xScale == xScaleLog) {
            xScale = xScaleLinear;
            xAxis.scale(xScale)
            xTitle.text("income per capita (dollars)");
          }
​
          group.select("circle")
            .transition()
            .duration(1000)
            .attr("cx", function(d) { return xScale(d.income); });
          group.select("text")
            .transition()
            .duration(1000)
            .attr("x", function(d) { return (xScale(d.income) + 3); });
​
          axisX.transition()
            .duration(1000)
            .call(xAxis);
        });
    });
  </script>
</body>
</html>
    