D3 Examples - animate

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<script src="https://d3js.org/d3.v4.min.js"></script>
​
<style type="text/css">
  /*css to go here*/
  svg {
    width: 800;
    height: 600;
  }
  circle {
    opacity: 0.5;
  }
</style>
​
<body></body>
​
<script>
  // properties
  var radius = 10;
  var duration = 1500;
  var width = 800;
  var height = 600;
  var svg = d3.select('body').append('svg');
  // scales
  var xScale = d3.scaleBand()
    .rangeRound([0, width]);
  var yScale = d3.scaleLinear()
    .range([height, 0]);
  var colorScale = d3.scaleOrdinal(d3.schemeCategory10);
  function update(data, year) {
    var filteredData = data.filter(function(d) {
      return d.year === year;
    });
    var circles = svg.selectAll('circle')
      .data(filteredData, function(d) {return d.key});
    var exit = circles.exit()
      .transition().duration(duration)
      .attr('r', 0)
      .remove();
    var enter = circles.enter().append('circle')
      .attr('cx', function(d) {return xScale(d.site)})
      .attr('cy', function(d) {return yScale(d.yield)});
    circles = enter.merge(circles)
      .attr('fill', function(d) {return colorScale(d.gen)})
      .transition().duration(duration)
      .attr('cx', function(d) {return xScale(d.site)})
      .attr('cy', function(d) {return yScale(d.yield)})
      .attr('r', radius);
  }
  d3.csv('barleyfull.csv', function(err, response) {
    response.forEach(function(d) {
      // convert yield and year from string to int
      d.year = +d.year;
      d.yield = +d.yield;
      // use gen and site as the unique key for each datum
      d.key = d.site + ':' + d.gen;
    });
    // set domain on the scales
    var xDomain = response.map(function(d) {return d.site});
    xScale.domain(xDomain);
    var yDomain = d3.extent(response, function(d) {return d.yield});
    yScale.domain(yDomain);
    
    var startYear = 1927;
    var numYears = 9;
    var index = 0;
    setInterval(() => {
      update(response, startYear + (index % numYears));
      index += 1;
    }, 1000)
  });
</script>
​
    