D3 Examples - genome browser

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
    <link rel="stylesheet" type="text/css" href="https://fonts.googleapis.com/css?family=Roboto+Slab:400,100,300,700">
    <link rel="stylesheet" type="text/css" href="https://fonts.googleapis.com/css?family=Roboto:400,100,100italic,300,300italic,400italic,500,500italic,700,700italic,900,900italic">
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​
</head>
​
<body>    
  <script>
    var genomelength = 7800;
    
    var tickMarks = {thousand: [], fivehundred: [], onehundred: []};
    
        var genome_positions = [];
        for (var i = 1; i <= genomelength; i++) {
        genome_positions.push(i);
        }
    
    genome_positions.forEach(function(currentValue, index, myArray){
      if (currentValue % 1000 === 0) {
        tickMarks.thousand.push(currentValue);
        
      }
      else if (currentValue % 500 === 0) {
        tickMarks.fivehundred.push(currentValue);
​
      }
      else if (currentValue % 100 === 0) {
        tickMarks.onehundred.push(currentValue);
      }
    });    
    var svg = d3.select("body").append("svg").attr({height: 500,width: genomelength/10});
    svg.append("rect")
      .attr({x: 0, y: 100, width: genomelength/10, height: 30})
        .style({"stroke-width": "2px", "fill": "white", "stroke": "black"});
    
    d3.json("genes.json.txt", function(error, json) {
          if (error) return console.warn(error);
            var genes = svg.selectAll(".genes")
        .data(json)
          .enter()
        .append("g");
​
            genes.append("rect")
        .attr("x", function (d) { return d.start/10; })
          .attr("y", function (d) { return 100; })
        .attr("height", function(d) { return 0;})
        .attr("width", function (d) { return (d.stop-d.start)/10; })
        .style({"stroke":"black", "stroke-width": "2px"})
            .transition().delay(3000).duration(1500)
        .attr("fill", function (d) {
            if (d.direction == "forward") {
            return "green";
          }
            else if (d.direction == "reverse") {
            return "red";
          }
            else {
            return "black";
          }
        }) 
      
          .attr("y", function (d) {
             
              if (d.direction === "forward") 
              if (d.name %2 === 0)
              {return 70}
                    else {return 40} 
        else if (d.direction === "reverse") 
                    if (d.name %2 === 0)
              {return 160}
                    else {return 130}}
              
             )
        .attr("height", function (d) {return 30;});
​
    genes.append("text")
        .attr("x", function(d) { return ((d.start + d.stop)/2)/10;})
        .attr("y", function (d) {
        if (d.direction == "forward") {
          if (d.name % 2 === 0) {
            return 90;
          }
          else { return 60;}
          }
            else if (d.direction == "reverse") {
            if (d.name % 2 === 0) {
                return 180;
            }
            else { return 150;}
          }
      })
        .style({"text-anchor": "middle", "fill": "black"})
        .text(function(d) {return d.name})
        .attr("fill-opacity", 0)
        .transition().delay(4500).duration(1000)
                .attr("fill-opacity", 1);
    });
    
    var group = svg.selectAll(".a")
      .data(tickMarks.thousand)
      .enter()
        .append("g")
    
    //var markers = [];
        //for (var i = 1; i <= genomelength; i++) {
        //markers.push(i)
      //if ()
      {//return i};
        };
    
    group.append("rect")
        .style({"fill": "black"})
      //.attr({x: 0, y: 100, width: "1px", height: 30})
      .attr({x: function (d) { return d/10; }, y: 100, width: "1px", height: 30})
        .attr({"fill-opacity": 0})
            .transition().duration(3000)
        .attr({"fill-opacity": 1});
​
        //.attr("transform", function (d) { return "translate(" + d/10 + ",0)"; });
        var group2 = svg.selectAll(".b")
      .data(tickMarks.fivehundred)
      .enter()
        .append("g");
    group2.append("rect")
        .style({"fill": "black"})
      .attr({x: 0, y: 100, width: "1px", height: 15})
        .transition().duration(2000)
      .attr("transform", function (d) { return "translate(" + d/10 + ",0)"; });
        var group3 = svg.selectAll(".c")
      .data(tickMarks.onehundred)
      .enter()
        .append("g");
    group3.append("rect")
        .style({"fill": "black"})
      .attr({x: 0, y: 115, width: "1px", height: 15})
        .transition().duration(1000)
      .attr("transform", function (d) { return "translate(" + d/10 + ",0)"; });
​
  </script>
</body>
​
    