Genome Browser with Tape Measure

<!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)
    
        
    
    var gene_data = [{"name":"1", "start": 50,"end":100, "direction": "F", "function": "function_1"},
                			{"name":"2", "start": 110,"end":200, "direction": "F", "function": "function_2"},
                			{"name":"3", "start": 250,"end":350, "direction": "R", "function": "function_3"},
                			{"name":"4", "start": 400,"end":600, "direction": "F", "function": "function_4"}]
    
    var ruler_100 = [];
    var ruler_500 = [];
    var ruler_1000 = [];
    
    var numbers = d3.range(10000);
    
    
    for (i in numbers){
      if (i % 1000 ==0){
        ruler_1000.push(numbers[i])
      }
      else if(i % 500 ==0){
        ruler_500.push(numbers[i])
      }
      else if (i % 100 ==0){
        ruler_100.push(numbers[i])
      }
    };
    //console.log("1000:", ruler_1000);
    //console.log("500:", ruler_500);
    //console.log("100:", ruler_100);
    
    
     svg.append("rect")
      .attr("y",100)
      .attr("x",0)
      .attr("width", 960)
      .attr("height", 50)
      .attr("fill","yellow")
      .attr("stroke", "black")
      .attr("stroke-width", 2)
    
    
    svg.selectAll(".rect1000")
    	.data(ruler_1000)
    	.enter()
    	.append("rect")
    	.classed("rect1000", true)
    	.attr("fill","black")
    	.attr("width", 2)
    	.attr("height", 50)
    	.attr("y", 100)
    	.attr("x", function(d) {return d/10});
    
    svg.selectAll(".rect500")
    	.data(ruler_500)
    	.enter()
    	.append("rect")
    	.classed("rect500", true)
    	.attr("fill","black")
    	.attr("width", 2)
    	.attr("height", 20)
    	.attr("y", 100)
    	.attr("x", function(d) {return d/10});
    
    svg.selectAll(".rect100")
    	.data(ruler_100)
    	.enter()
    	.append("rect")
    	.classed("rect100", true)
    	.attr("fill","black")
    	.attr("width", 2)
    	.attr("height", 10)
    	.attr("y", 100)
    	.attr("x", function(d) {return d/10});
    
    
    
    
    console.log(gene_data);
    
    svgEnter = svg.selectAll("rect") //selects anything in the svg data file
    	.data(gene_data)	//data join... what connects the data to making the pic
    	.enter();
    
    	    	
    	svgEnter.append("rect")
    	.attr("y",function(d) {if ( d.direction=="F" ) {return 100;} else {return 200;}})    														                            
    	.attr("x", function(d) {if ( d.direction=="F" ) {return 0-(d.end-d.start);} else {return 960;}})
    	.attr("f", function(d) {return d.function;})
    	.attr("width", function(d) {return d.end-d.start;})
    	.attr("height", 50)
    	.attr("fill", function (d) {if (d.direction=="F"){return "Tomato";} else {return "Turquoise";}})
      
      
    
    	
      .transition()
    	.duration(1500)
    	.delay(function(d, i) {return i *1500})
    	.attr("x", function(d) {return d.start;})
    	;
    
    	svgEnter.append("text")
    	.text(function (d) {return d.name})
      .attr("text-anchor","middle")
      .attr("alignment-baseline","middle")
      .attr("opacity",0)
      .attr("font-size", 20)
      .attr("font-family", "monospace")
      .attr("x", function (d) {return (d.start + d.end)/2})
      .attr("y",function(d) {if ( d.direction=="F" ) {return 125;} else {return 225;}})
      
      .transition()
      .duration(2000)
      .delay(300 + (gene_data.length) * 1000)
      .attr("opacity",1)
      
    	;
    
    
   
      
    	
    
    	
    	
    	
    	
    
    	
    
    
    
    
    
    
  </script>
</body>

https://d3js.org/d3.v4.min.js