histogram

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forked from santiagogaray's block: Pack

<!DOCTYPE html>
<meta charset="utf-8">
<style>

.bar rect {
  fill: steelblue;
}

.bar text {
  fill: #fff;
  font: 10px sans-serif;
}

</style>
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>

d3.csv("histogram.csv", function (data) {
		map = data.map(function(d,i){ return parseFloat(d.age); })
        var formatCount = d3.format(",.0f");

var svg = d3.select("svg"),
        margin = {top: 10, right: 30, bottom: 30, left: 30},
        width = +svg.attr("width") - margin.left - margin.right,
        height = +svg.attr("height") - margin.top - margin.bottom,
        g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var x = d3.scaleLinear()
        .rangeRound([0, width])
				.domain([0,d3.max(map)]);
    
    var bins = d3.histogram()
        .domain(x.domain())
        .thresholds(x.ticks(10))
        (map);

var y = d3.scaleLinear()
        .domain([0, d3.max(bins, function(d) { return d.length; })])
        .range([height, 0]);

var bar = g.selectAll(".bar")
      .data(bins)
      .enter().append("g")
        .attr("class", "bar")
        .attr("transform", function(d) { return "translate(" + x(d.x0) + "," + y(d.length) + ")"; });
    
    
    bar.append("rect")
        .attr("x", 1)
        .attr("width", x(bins[0].x1) - x(bins[0].x0) - 1)
        .attr("height", function(d) { return height - y(d.length); });

bar.append("text")
        .attr("dy", ".75em")
        .attr("y", 6)
        .attr("x", (x(bins[0].x1) - x(bins[0].x0)) / 2)
        .attr("text-anchor", "middle")
        .text(function(d) { return formatCount(d.length); });

g.append("g")
        .attr("class", "axis axis--x")
        .attr("transform", "translate(0," + height + ")")
        .call(d3.axisBottom(x));
    
})
  
</script>
</body>

https://d3js.org/d3.v4.min.js