D3 Examples - Scale & Axis example

xxxxxxxxxx
 
<!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>
    var city = 'New York'; 
    var width = 800;
    var height = 300;
    
    // dataset of city temperatures across time
    d3.tsv('data.tsv', (err, data) => {
      // clean the data
      data.forEach(d => {
        d.date = d3.timeParse('%Y%m%d')(d.date); // x
      });
      
      // use extent, which gives back [min, max]
      var max = d3.max(data, d => d[city]);
      console.log(max)
​
      // try different scales, change the ranges, see what happens
      var yScale = d3.scaleLinear()
        .domain([0, max])
        .range([height, 0]);
      
      var yScaleReverse = d3.scaleLinear()
        .domain([0, max])
        .range([0, height]);
      
      // try passing in tick valuess
        var yAxis = d3.axisLeft()
        .scale(yScale);
      
      d3.select('svg').append('g')
        .attr('transform', 'translate(20, 20)')
        .call(yAxis);
      
      var xScale = d3.scaleTime()
        .domain(d3.extent(data, d => d.date))
        .range([0, width]);
      
      var xScaleData = d3.scaleLinear()
        .domain([0, data.length])
        .range([0, width]);
      var xScaleColor = d3.scaleLinear()
        .domain([0, data.length])
        .range([0, 1]);
      
      var xAxies = d3.axisBottom()
        .scale(xScale);
      
      d3.select('svg').append('g')
        .attr('transform', 'translate(20, '+(height+20)+')')
        .call(xAxies);
      
      d3.select('svg')
        .append('g')
        .attr('transform', 'translate(22, 20)')
        .selectAll('rect')
        .data(data.map(d => d[city]))
        .enter().append('rect')
        .attr('x', (d, i) => xScaleData(i))
        .attr('y', yScale)
        .attr('width', (width/ data.length) - 1)
        .attr('height', yScaleReverse)
        .attr('fill', (d, i) => d3.interpolateWarm(xScaleColor(i)))
    });
  </script>
</body>
​
    