D3 Examples - Milage vs Price 2

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>D3 Example</title>
    <script src="https://cdn.jsdelivr.net/npm/d3@3.5.17/d3.min.js"></script>
<link href="https://fonts.googleapis.com/css?family=PT+Sans+Narrow" rel="stylesheet">
    <style>
    
      .axis text {
        font-family: 'PT Sans Narrow', sans-serif;
        font-size: 16pt;
      }
      .axis .label {
        font-size: 20pt;
      }
      .axis path, .axis line {
        fill: none;
        stroke: #000;
        shape-rendering: crispEdges;
      }
​
    </style>
  </head>
  <body>
    <script>
    
      var outerWidth = 960;
      var outerHeight = 500;
      var margin = { left: 60, top: 5, right: 10, bottom: 60 };
            var r = 10;
      var xColumn = "MPG";
      var yColumn = "Price";
​
      var xAxisLabelText = "Miles per Gallon";
      var xAxisLabelOffset = 48;
​
      var yAxisLabelText = "Price";
      var yAxisLabelOffset = 30;
​
      var innerWidth  = outerWidth  - margin.left - margin.right;
      var innerHeight = outerHeight - margin.top  - margin.bottom;
​
      var svg = d3.select("body").append("svg")
        .attr("width", outerWidth)
        .attr("height", outerHeight);
      
      var g = svg.append("g")
        .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
      
      var xAxisG = g.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + innerHeight + ")")
      
      var xAxisLabel = xAxisG.append("text")
        .style("text-anchor", "middle")
        .attr("x", innerWidth / 2)
        .attr("y", xAxisLabelOffset)
        .attr("class", "label")
        .text(xAxisLabelText);
      
      var yAxisG = g.append("g")
        .attr("class", "y axis");
      
      var yAxisLabel = yAxisG.append("text")
        .style("text-anchor", "middle")
        .attr("transform", "translate(-" + yAxisLabelOffset + "," + (innerHeight / 2) + ") rotate(-90)")
        .attr("class", "label")
        .text(yAxisLabelText);
​
      var xScale = d3.scale.linear().range([0, innerWidth]);
      var yScale = d3.scale.linear().range([innerHeight, 0]);
​
      var xAxis = d3.svg.axis().scale(xScale).orient("bottom")
        .ticks(10)
        .tickFormat(d3.format("s"))
        .outerTickSize(0);
​
      var yAxis = d3.svg.axis().scale(yScale).orient("left")
        .ticks(5)
        .tickFormat(d3.format("s"))
        .outerTickSize(0);
​
      function render(data){
        xScale.domain(d3.extent(data, function (d){ return d[xColumn]; }));
        yScale.domain(d3.extent(data, function (d){ return d[yColumn]; }));
​
        xAxisG.call(xAxis);
        yAxisG.call(yAxis);
​
        var cars = g.selectAll('svg').data(data);
        
        console.log("Cars", cars);
​
        var carsGroupEnter = cars.enter().append("svg");
        
        // Enter selection
        carsGroupEnter.append("rect");
        carsGroupEnter.append("circle");
        carsGroupEnter.append("text");
​
        // Update selection - this will also contain the newly appended elements
        cars
          .attr("x", function (d){ return xScale(d[xColumn]);})
          .attr("y", function (d){ return yScale(d[yColumn]);})
            .attr("width", function (d){ return (d.Model.length / 2) + 3 + "em";})        
          .attr("height", "30");
        
        cars.select("rect")
          .attr("width", "100%")
          .attr("height", "100%")
          .attr("fill", "lime");
​
        cars.select("circle")
          .attr("cx", r + 10)
          .attr("cy", (r/2) + 9)
          .attr("r", r)
          .attr("fill", "red");
        
        cars.select("text")
            .attr( "x", "30")
            .attr( "y" , "20")
          .text(function (d){ return d.Model;});
        
        // Exit selection
        cars.exit().remove();
        
      }
​
      function type(d){
        d.Year = +d.Year;
        d.Price  = +d.Price;
        d.MPG = +d.MPG;
        return d;
      }
​
      d3.csv("car-makers.csv", type, render);
​
      //test enter and leave
//       Year,Model,Type,MPG,Price
// 2017,BMW i3 BEV,electric,124,42000
// 2017,BMW 328d xDrive 2.0L 4 cyl Automatic (S8),Diesel,34,42000
// 2017,Audi A3 e-tron 1.4L 4 cyl Automatic (AM-S6),Gas and Electricity,84,47000
// 2017,Honda Odyssey 3.5L 6 cyl Automatic 6-spd,Gas,22,30000
      
     setTimeout(function(){
       render([{
         Year: 2016,
         Model: "Honda Civic 1.4",
         Type: "Gas",
         MPG: 42,
         Price: 11000
       },{
         Year: 2016,
         Model: "Ford Taurus",
         Type: "Gas",
         MPG: 35,
         Price: 26000
       }]);
     }, 3000);
      
     setTimeout(function(){
       render([{
         Year: 2014,
         Model: "VW Jetta 1.2",
         Type: "Diessel",
         MPG: 42,
         Price: 16000
       },{
         Year: 2015,
         Model: "Audi A4",
         Type: "Gas",
         MPG: 32,
         Price: 35000
       },{
         Year: 2017,
         Model: "Chevy Colorado",
         Type: "Gas",
         MPG: 18,
         Price: 42000
       }]);
     }, 5000);
      
    </script>
  </body>
</html>
​
    