D3 Examples - simple genome map

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <script>
    
    // Feel free to change or delete any of the code you see in this editor!
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)
    
        d3.json("data.json", function(err, mydata) {
      var geneGroup = d3.select("svg").selectAll("rect")
        .data(mydata)
        .enter()
        .append("g");
        geneGroup.append("rect")
    
        .attr("y", function (d) {
            if (d.orientation == "forward") {
            return 100;
          }
            else if (d.orientation == "reverse") {
            return 125;
          }
      })
        .attr("height", 50)
        .attr("stroke-width", 5)
        .attr("stroke", "black")
        .attr("x", function (d) {
            return d.start;
        })
        .attr("width", function (d) {
            return d.stop - d.start;
        })
        .attr("fill", function(d) {
            if (d.orientation == "forward") {
            return "green";  
          }
            else if (d.orientation == "reverse") {
            return "red";
          } 
      });
    geneGroup.append("text")
    .text(function (d) {
        return d.name;
   })
    .attr("y", function (d) {
      if (d.orientation =="forward") {
      return 125
      }
   
    })
   .attr("y", function (d) {
            if (d.orientation == "forward") {
            return 125;
          }
            else if (d.orientation == "reverse") {
            return 150;
          }
      })
   .attr("x", function (d) {
     return d.start;
    })
    .attr("font-size", 20)
         .attr("font-family", "Cambria")
    });
        
  </script>
</body>
​
    