D3 Examples - genome browser (testing)

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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>
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</head>
​
<body>
  <script>
    var genomelength = 10000;
    
    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"});
    svg.append("rect")
    .attr({x: 0, y: 330, 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 rects = svg.selectAll(".genes")
            .data(json)
            .enter()
            .append("rect");
      
        var text = svg.selectAll(".text")
            .data(json)
            .enter()
            .append("text");
      
        var textLabels=text
            .attr("x", function (d) { return ((d.stop+d.start)/10)/2; })
            .attr("y", function (d) { return 90; })
            .attr("y", function (d) {
        if (d.direction==="forward"&& d.name%2!=0) { return 92;} 
                else if (d.direction==="forward" && d.name%2===0){return 62}
                else if (d.direction==="reverse"&& d.name%2 !=0){return 182;}
                else if (d.direction==="reverse"&&d.name%2 ===0){return 152}})
            .text(function (d){return d.name})
            .attr("font-family", "arial")
            .attr("font-size", "20px")
            .attr("text-anchor","middle")
            .attr("fill", "cyan"); 
​
        var rectAttributes = rects
        .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({"fill": function (d) {
                    if (d.direction ==="reverse") {return "purple"} 
                    else if (d.direction === "forward"){ return"gold"}},
                    "stroke":"black", "stroke-width": "2px"})
                .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("x", function (d) {
                    if (d.direction === "forward") {
                    return (0 - ((d.stop-d.start)/10)) - 2;}
                    else if (d.direction === "reverse") {
                    return (genomelength/10) + 2;}})
                .transition().delay(3000).duration(1000)
                .attr("x", function (d) { return d.start/10; })
                .attr("y", function (d) {
                    if (d.direction==="forward" && d.name%2 !=0) { return 70;}
                    else if (d.direction==="forward" && d.name%2===0){return 40}
                    else if (d.direction==="reverse"&&d.name%2 !=0){return 155;}
                    else if (d.direction==="reverse"&&d.name%2 ===0){return 130}})
                .attr("height", function (d) {return 30;})
      });
    var group = svg.selectAll(".a")
      .data(tickMarks.thousand)
      .enter()
        .append("g");
    group.append("rect")
        .style({"fill": "black"})
      .attr({x: 0, y: 100, width: "1px", height: 30})
            .transition().duration(3000)
        .attr("transform", function (d) { return "translate(" + d/10 + ",0)"; });
    group.append("text")
        .text(function (d){return d/1000})
        .attr({x: 3, y: 113, width: "1px", height: 30})
        .attr("transform", function (d) { return "translate(" + d/10 + ",0)"; })
      .attr("font-family", "sans-serif")
      .attr("font-size", "15px")
      .attr("text-anchor","start")
      .attr("fill", "blue"); 
        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)"; })
            var group = svg.selectAll(".d")
      .data(tickMarks.thousand)
      .enter()
        .append("g");
    group.append("rect")
        .style({"fill": "black"})
      .attr({x: 0, y: 330, width: "1px", height: 30})
            .transition().duration(3000)
        .attr("transform", function (d) { return "translate(" + d/10 + ",0)"; });
     group.append("text")
        .text(function (d){return d/1000})
        .attr({x: 3, y: 343, width: "1px", height: 30})
        .attr("transform", function (d) { return "translate(" + d/10 + ",0)"; })
      .attr("font-family", "sans-serif")
      .attr("font-size", "15px")
      .attr("text-anchor","start")
      .attr("fill", "blue");
        var group2 = svg.selectAll(".e")
      .data(tickMarks.fivehundred)
      .enter()
        .append("g");
    group2.append("rect")
        .style({"fill": "black"})
      .attr({x: 0, y: 330, width: "1px", height: 15})
        .transition().duration(2000)
      .attr("transform", function (d) { return "translate(" + d/10 + ",0)"; });
        var group3 = svg.selectAll(".f")
      .data(tickMarks.onehundred)
      .enter()
        .append("g");
    group3.append("rect")
        .style({"fill": "black"})
      .attr({x: 0, y: 345, width: "1px", height: 15})
        .transition().duration(1000)
      .attr("transform", function (d) { return "translate(" + d/10 + ",0)"; });
​
  </script>
</body>
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