D3 Examples - Genome Ruler

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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>
    <script type="text/javascript" src="https://d3js.org/d3.v3.min.js"></script>
​
</head>
​
<body>
  <style>
  div.tooltip {
  position: absolute;   
  text-align: center;   
  width: 60px;  
  height: 28px;     
  padding: 2px; 
  font: 12px sans-serif;    
  background: lightsteelblue;   
  border: 0px;                  
  border-radius: 8px;
 /*  pointer-events: none;  This line needs to be removed */
    
}
  </style>
  
  <script>
    // Feel free to change or delete any of the code you see!
    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("g")
      .append("rect")
      .attr({x: 0, y: 100, width: genomelength/10, height: 30})
        .style({"stroke-width": "2px", "fill": "white", "stroke": "black"});
    
 // Define 'div' for tooltips
var div = d3.select("body")
    .append("div")  // declare the tooltip div 
    .attr("class", "tooltip")              // apply the 'tooltip' class
    .style("opacity", 0);                  // set the opacity to nil   
    
​
    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 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":"green","stroke":"black", "stroke-width": "2px"})
            //.transition().delay(3000).duration(1000)
   .on("mouseover", function(d) {       
            div.transition()        
                .duration(200)      
                .style("opacity", .9);      
            div .html(d.name)
                .style("left", (d3.event.pageX) + "px")     
                .style("top", (d3.event.pageY - 28) + "px");    
            })                  
        
      
      
     
          .attr("y", function (d) {
          if(d.direction=="forward" && d.name%2==0){
            return 70;
          }
          else if (d.direction=="forward"&& d.name%2!=0){
            return 30
          }
          else if(d.direction=="reverse" && d.name%2==0){
            return 130}
          else if(d.direction=="reverse" && d.name%2!==0){
            return 160
          }
            
          })
          
​
        .attr("height", function (d) {return 30;})
        .style({"fill":function(d){if(d.direction=="forward"){return "green"}else if (d.direction=="reverse"){return "red"}} 
      });  
    });
​
     d3.json("genes.json.txt", function(error, json) {
          if (error) return console.warn(error);
            var text = svg.selectAll(".genes")
        .data(json)
          .enter()
        .append("text");
        var texts = text
        .text(function(d)  
              {
                    var percent = 0;
                    var GC = 0;
                    for (var i=0;i<d.sequence.length;i++){
                            // calculate % of G and C
                  if (d.sequence[i] === "G" || d.sequence[i] === "C") {
                    GC++;
                    // this symbol: || means "or"
                  }
                            }  
                percent = (GC/d.sequence.length) * 100;
                return percent;
              })
      
            .attr("y", function(d){
          if(d.direction=="forward" && d.name%2==0){
            return 90;
          }
          else if (d.direction=="forward"&& d.name%2!=0){
            return 50
          }
          else if(d.direction=="reverse" && d.name%2==0){
            return 150}
          else if(d.direction=="reverse" && d.name%2!==0){
            return 180
          }})
      .attr("x",function(d){return ((d.start+(d.stop - d.start)/2)/10)})
      
      })
​
     
    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("y", 112)
        .attr("x", function (d){return d/10})
        .style("font-size","12")
    
    
        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>
​
    