histogram example

_.md

[ Launch: Tributary inlet ] 5388568 by jvns

config.json

{"description":"histogram example","endpoint":"","display":"svg","public":true,"require":[],"fileconfigs":{"inlet.js":{"default":true,"vim":false,"emacs":false,"fontSize":12},"style.css":{"default":true,"vim":false,"emacs":false,"fontSize":12},"_.md":{"default":true,"vim":false,"emacs":false,"fontSize":12},"config.json":{"default":true,"vim":false,"emacs":false,"fontSize":12}},"fullscreen":false,"play":false,"loop":false,"restart":false,"autoinit":true,"pause":true,"loop_type":"period","bv":false,"nclones":15,"clone_opacity":0.4,"duration":3000,"ease":"linear","dt":0.01}

inlet.js

// Generate an Irwin–Hall distribution of 10 random variables.
var values = d3.range(1000).map(d3.random.irwinHall(10));
values = [1,2,38]
function update_histogram(values) {
// A formatter for counts.
var formatCount = d3.format(",.0f");

var margin = {top: 63, right: 30, bottom: 30, left: 30},
    width = 568 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;


var x = d3.scale.linear()
    .domain([d3.min(values), d3.max(values)])
    .range([0, width]);

// Generate a histogram using twenty uniformly-spaced bins.
var data = d3.layout.histogram()
    (values);

var y = d3.scale.linear()
    .domain([0, d3.max(data, function(d) { return d.y; })])
    .range([height, 0]);

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");

var svg = d3.select("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.selectAll(".bar").remove()
d3.selectAll(".axis").remove()

var bar = svg.selectAll(".bar")
    .data(data)
    .enter().append("g")
    .attr("class", "bar")
    .attr("transform", function(d) { return "translate(" + x(d.x) + "," + y(d.y) + ")"; });

bar.append("rect")
    .attr("x", 1)
    .attr("width", x(data[0].dx) - 1)
    .attr("height", function(d) { return height - y(d.y); });

bar.append("text")
    .attr("dy", ".75em")
    .attr("y", 10)
    .attr("x", x(data[0].dx) / 2)
    .attr("text-anchor", "middle")
    .text(function(d) { return formatCount(d.y); });

svg.append("g")
    .attr("class", "x axis")
    .attr("transform", "translate(0," + height + ")")
    .call(xAxis);
  
}
update_histogram(values)
update_histogram([1,2,3])
update_histogram([1,2,3,6])

style.css

body {
  font: 10px sans-serif;
}

.bar rect {
  fill: steelblue;
  shape-rendering: crispEdges;
}

.bar text {
  fill: #fff;
}

.axis path, .axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}