D3 Examples - NYC Temps 2011/2012

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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; }
        svg {
      width: 100%;
      height: 100%;
    }
  </style>
</head>
​
<body>
  <svg></svg>
  <script>
    //1. Identify width, height and margins.
    const height = 300;
    const width = 800;
    const margin = {top: 20, bottom: 20, left: 20, right: 20};
    
    //2. Clean data. Change string date to datetime and string temp to float
    const city = "New York";
    
    d3.tsv('data.tsv',(err, data) => {
           data.forEach(d=> {
             d.date = d3.timeParse("%Y%m%d")(d.date);
             ++d[city];
           });
           
           //3. create the scales
            //extent: returns min and max of array
            xDomain = d3.extent(data, d => d.date)
            const xScale = d3.scaleTime()
                                    .domain(xDomain)
                                    .range([margin.left, width - margin.right])
          
          yMax = d3.max(data, d => d[city])
            const yScale = d3.scaleLinear()
                                    .domain([0, yMax])
                                    .range([height - margin.bottom, margin.bottom])
            
          const heightScale = d3.scaleLinear()
                                                    .domain([0, yMax])
                                                .range([0, height - margin.top - margin.bottom]);
          //4. create image
          var svg = d3.select("svg")
          
          var rect = svg.selectAll("rect")
                            .data(data)
                            .enter().append("rect")
                            .attr('width', 2)
                            .attr('height', d => heightScale(d[city]))
                            .attr('x', d => xScale(d.date))
                    .attr('y', d => yScale(d[city]))
                            .attr('fill', 'blue')
                            .attr('stroke', 'white')
          
          //5. create axes
          
          const xAxis = d3.axisBottom()
                                            .scale(xScale)
                                            .tickFormat(d3.timeFormat('%b %Y'))
          const yAxis = d3.axisLeft()
                                    .scale(yScale)
          
          svg.append('g')
          .attr('transform', 'translate(' + [0, height -margin.bottom] + ')')
          .call(xAxis)
          
          svg.append('g')
          .attr('transform', 'translate(' + [margin.left, 0] + ')')
          .call(yAxis)
       });
        
​
  </script>
</body>
​
    