D3 Examples - Scale test

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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 data = [
      { date: new Date('Mon Jun 11 2018 16:12:17 GMT+0300'), value: 10 },
      { date: new Date('Tue Jun 12 2018 16:12:14 GMT+0300'), value: 15 },
      { date: new Date('Wed Jun 13 2018 16:12:12 GMT+0300'), value: 20 },
      { date: new Date('Thu Jun 14 2018 16:12:08 GMT+0300'), value: 5 },
      { date: new Date('Fri Jun 15 2018 16:11:12 GMT+0300'), value: 18 },
    ];
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)
​
   
    var start = new Date('Fri Jun 15 2018 16:11:12 GMT+0300');
    var end = new Date('Fri Jun 20 2018 16:11:12 GMT+0300');
​
    var scaleX = d3.scaleTime()
        .range([50, 700])
        .domain([start, end]);
    
    var most = d3.max(data, function(i) { return i.value; });
        var scaleY = d3.scaleLinear().range([150, 50]).domain([0, most]);
   
    var chart = svg.append('g').selectAll('.bar').data(data);
    
    var dates = scaleX.domain();
    var totalDays = Math.ceil((dates[1].valueOf() - dates[0].valueOf()) / 86400000);
    
    var width = scaleX.range()[1] - scaleX.range()[0];
        var barWidth = width / (totalDays - 1) - 3;
    
    svg.append("text")
      .text("Total days: " + totalDays + ' width: ' + width + ' Bar width: ' + barWidth)
      .attr("y", 200)
      .attr("x", 50)
      .attr("font-size", 36)
      .attr("font-family", "monospace")
    
    // Main chart
    chart.enter().append('rect')
        .attr('x', function(d, ix) { return scaleX(d.date);})
        .attr('y', function(d) { return scaleY(d.value);})
        .attr('width', barWidth)
        .attr('height', function(d) { return scaleY.range()[0] - scaleY(d.value); })
        .style('fill', 'steelblue');
    // **********************************************
    
    var startCord = scaleX(scaleX.domain()[0]);
    var endCord = scaleX(scaleX.domain()[1]);
    svg.append('line')
      .attr('x1', startCord)
        .attr('y1', 40)
        .attr('x2', endCord)
        .attr('y2', 40)
      .style('stroke', 'black')
    
    
    svg.append('circle').attr('r', 5).attr('cx', startCord).attr('cy', 40).style('fill', 'steelblue');
    svg.append('circle').attr('r', 5).attr('cx', endCord).attr('cy', 40).style('fill', 'steelblue');
    
    svg.append('circle').attr('r', 5).attr('cx', scaleX.range()[0]).attr('cy', 250).style('fill', 'red');
    svg.append('circle').attr('r', 5).attr('cx', scaleX.range()[1]).attr('cy', 250).style('fill', 'red');
​
    data.forEach(d => {
      svg.append('circle').attr('r', 5).attr('cx', scaleX(d.date)).attr('cy', 30).style('fill', 'violet');
    })
    
  </script>
</body>
​
    