D3 Examples - Paths (Line Graph)

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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>
  <svg></svg>
  <script>
    var width = 900
    var height = 400
    var padding = {top: 20, left: 40, right: 20, bottom: 40}
    var city = 'New York'; 
    
        d3.tsv('data.tsv', (err, data) => {
      // clean data
      data.forEach(d => {
        d.date = d3.timeParse('%Y%m%d')(d.date)
        d[city] = +d[city]
      })
      
      // setup extents
      console.log(data)
​
        var xExtent = d3.extent(data.map(d => d.date))
      var yExtent = d3.extent(data, d => d[city])
​
      console.log(xExtent)
      console.log(yExtent)
​
      // setup scales
      var xScale = d3.scaleTime()
        .domain(xExtent)
        .range([padding.left, width - padding.right])
      
      var yScale = d3.scaleLinear()
        .domain(yExtent)
        .range([height - padding.bottom, padding.top])
      
      var xColorScale = d3.scaleTime()
        .domain(xExtent)
        .range[0, 1]
​
      // draw svg
      var svg = d3.select('svg')
        .attr('width', width)
        .attr('height', height)
      
      var xAxis = d3.axisBottom(xScale)
        .tickFormat(d3.timeFormat('%b %Y'))
      var yAxis = d3.axisLeft(yScale)
      
      var line = d3.line()
        .x(d => xScale(d.date))
        .y(d => yScale(d[city]))
        .curve(d3.curveStepAfter)
      
      // add a background
      svg.append('rect')
                .attr('x', padding.left)
        .attr('y', padding.top)
          .attr('width', width - padding.left - padding.right)
        .attr('height', height - padding.top - padding.bottom)
        .attr('fill', '#efefef')
​
      // draw a single path for the line
      svg.append("path")
        .attr('d', line(data))
        .attr('fill', 'none')
        .attr('stroke', 'fuchsia')
      
      // draw x-axis
      svg.append("g")
        .attr('transform', 'translate(0,'+(height-padding.bottom)+')')
        .call(xAxis)
      
      // draw y-axis
      svg.append("g")
        .attr('transform', 'translate('+padding.left+',0)')
        .call(yAxis)
    })
      
​
  </script>
</body>
​
    