var w = 120,

    h = 500,

    m = [10, 50, 20, 50], // top right bottom left

    min = Infinity,

    max = -Infinity;

var chart = d3.chart.box()

    .whiskers(iqr(1.5))

    .width(w - m[1] - m[3])

    .height(h - m[0] - m[2]);

d3.csv("../data/morley.csv", function(csv) {

  var data = [];

  csv.forEach(function(x) {

    var e = ~~x.Expt - 1,

        r = ~~x.Run - 1,

        s = ~~x.Speed,

        d = data[e];

    if (!d) d = data[e] = [s];

    else d.push(s);

    if (s > max) max = s;

    if (s < min) min = s;

  });

  chart.domain([min, max]);

  var vis = d3.select("#chart").selectAll("svg")

      .data(data)

    .enter().append("svg:svg")

      .attr("class", "box")

      .attr("width", w)

      .attr("height", h)

    .append("svg:g")

      .attr("transform", "translate(" + m[3] + "," + m[0] + ")")

      .call(chart);

  chart.duration(1000);

  window.transition = function() {

    vis.map(randomize).call(chart);

  };

});

function randomize(d) {

  if (!d.randomizer) d.randomizer = randomizer(d);

  return d.map(d.randomizer);

}

function randomizer(d) {

  var k = d3.max(d) * .02;

  return function(d) {

    return Math.max(min, Math.min(max, d + k * (Math.random() - .5)));

  };

}

// Returns a function to compute the interquartile range.

function iqr(k) {

  return function(d, i) {

    var q1 = d.quartiles[0],

        q3 = d.quartiles[2],

        iqr = (q3 - q1) * k,

        i = -1,

        j = d.length;

    while (d[++i] < q1 - iqr);

    while (d[--j] > q3 + iqr);

    return [i, j];

  };

}