D3 Examples - Movie Genre, Rating and Budget

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<html>
  <head>
    <style>
      body {
       font: 14px sans-serif; 
      }
      
      .axis path,
      .axis line {
        fill: none;
        stroke: black;
      }
      
      .axis path { stroke: none; }
    </style>
  </head>
  <body>
     <script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>
     <script src="force-chart.js"></script>
     <script>
       var margin = { top: 10, left: 100, bottom: 30, right: 50 },
           width = 960 - margin.left - margin.right,
           height = 600 - margin.top - margin.bottom;
       
       var x = function(d) { return d.rating; },
           y = function(d) { return d.genre; },
           area = function(d) { return d.budget; };
       
       var xScale = d3.scale.linear()
             .domain([0, 10])
             .range([0, width]),
           yScale = d3.scale.ordinal()
             .domain(["Comedy", "Action", "Romance", "Animation", "Drama"])
             .rangeBands([height, 0]),
           areaScale = d3.scale.linear().range([0, 125]),
           colorScale = d3.scale.quantize()
            .domain([0, 10])
            .range(["#AB879C","#928EAB","#6C97B0","#3E9EA7","#1BA38F",
                    "#37A46C","#62A145","#8D991C","#B98A00","#E07423"]);
       
       var xValue = function(d) { return xScale(x(d)); },
           yValue = function(d) { return yScale(y(d)) + yScale.rangeBand()/2; },
           rValue = function(d) {
             var A = areaScale(area(d));
             return Math.sqrt(A / Math.PI);
           },
           colorValue = function(d) { return colorScale(x(d)); };
       
       var xAxis = d3.svg.axis().scale(xScale).orient("bottom"),
           yAxis = d3.svg.axis().scale(yScale).orient("left");
       
       var bubbleChart = d3.forceChart()
        .size([width, height])
        .x(xValue)
        .y(yValue)
        .r(rValue)
        .xGravity(3)    // make the x-position more accurate
        .yGravity(1/3); // ...and the y-position more flexible
        
       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.json("movies.json", function(error, movies) {
         if (error) throw error;
         
         areaScale.domain([0,d3.max(movies, area)]);
         
         // Draw axes
         svg.append("g")
            .attr("class", "x axis")
            .attr("transform", "translate(0," + height + ")")
            .call(xAxis)
          .append("text")
            .attr("dx", width)
            .attr("dy", -6)
            .style("text-anchor", "end")
            .text("IMDB Rating");
          
         svg.append("g")
            .attr("class", "y axis")
            .call(yAxis)
          .selectAll(".tick line")
            .attr("x2", width)
            .attr("stroke-dasharray", "1, 2")
            .style("stroke", "lightgrey");
         
         // Draw legend
         svg.append("g").call(legend);
            
         // Draw bubbles
         svg.append("g").call(bubbleChart, movies)
            .attr("class", "bubbles")
          .selectAll(".node").append("circle")
            .attr("r", function(d) { return d.r0; })
            .attr("fill", colorValue)
            .attr("stroke", "slategrey");
       });
       
       function legend(selection) {
         var legendData = [
           { budget: 200000000, text: "$200 million", dy: 0 },
           { budget: 100000000, text: "$100 million", dy: 20 },
           { budget: 50000000, text: "$50 million", dy: 40 },
           { budget: 10000000, text: "$10 million", dy: 60 }
         ];
         
         var legend = selection
            .attr("class", "legend")
            .attr("transform", "translate(" + xScale(9.5) + "," + (height/2 - 30) + ")");
         
         legend.append("text")
          .attr("dx", -6)
          .attr("dy", -16)
          .text("Budget");
          
         legend.selectAll(".item").data(legendData)
          .enter().append("g")
            .attr("transform", function(d) { return "translate(0," + d.dy + ")"; })
            .each(function(d) {
              d3.select(this).append("circle")
                .attr("r", rValue(d))
                .style("fill", "none")
                .style("stroke", "slategrey");
              d3.select(this).append("text")
                .attr("dx", 10)
                .attr("dy", 4)
                .text(d.text);
            });
       }
     </script>
  </body>
</html>
    