D3 Examples - OSM Commits by Second by Year

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
body {
  font: 10px sans-serif;
}
​
.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
​
.bar {
  fill: steelblue;
}
​
.x.axis path {
  display: none;
}
​
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>
​
var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 900 - margin.left - margin.right,
    height = 400 - margin.top - margin.bottom;
​
var x = d3.scale.linear()
    .range([0, width]);
​
var y = d3.scale.linear()
    .range([height, 0]);
​
var xAxis = d3.svg.axis()
    .scale(x)
    .ticks(12)
    .orient("bottom")
    .tickFormat(function(d) {
        var hrs = Math.floor(d/60);
        var mins = d % 60;
        return hrs + ':' + mins;
    });
​
var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");
​
var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
​
d3.json("timehist_year.json", function(error, data) {
​
  var year = 2011;
​
  var data = d3.entries(data).map(function(d) {
      return {
          key: d.key,
          value: d3.entries(d.value).map(function(d) {
              return {
                  sec: +d.key,
                  count: +d.value
              };
          })
      };
  });
​
  var d = data.filter(function(d) {
      return d.key == year;
  })[0].value;
​
  x.domain([0, d3.max(d, function(d) { return d.sec; })]);
  y.domain([0, d3.max(d, function(d) { return d.count; })]);
​
  year = 2005;
​
  var d = data.filter(function(d) {
      return d.key == year;
  })[0].value;
​
  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);
​
  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Commits");
​
  function draw(d) {
​
      var bars = svg.selectAll(".bar")
          .data(d);
​
          bars.enter().append("rect")
            .attr('class', 'bar');
​
      bars
        .data(d)
        .transition()
        .delay(function(d, i) { return i; })
        .attr("x", function(d) { return x(d.sec); })
        .attr("width", x(d[1].sec))
        .attr("y", function(d) { return y(d.count); })
        .attr("height", function(d) { return height - y(d.count); });
      bars
        .exit()
        .remove();
  }
​
  d3.select('#tz')
    .on('change', function() {
        var v = this.value;
        draw(data.filter(function(d) {
            return d.key == v;
        })[0].value);
    })
    .selectAll('option')
    .data(data.map(function(d) { return d.key; }))
    .enter()
    .append('option')
        .text(String)
        .attr('value', String);
​
    draw(data.filter(function(d) {
        return d.key == 2005;
    })[0].value);
});
​
</script>
<br />year: <select id='tz'>
</select>
​
    