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d3.box.js
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// https://github.com/d3/d3-plugins/blob/master/box/box.js
(function () {
// Inspired by http://informationandvisualization.de/blog/box-plot
d3.box = function () {
var width = 1,
height = 1,
duration = 0,
delay = 0,
domain = null,
value = Number,
whiskers = boxWhiskers,
quartiles = boxQuartiles,
tickFormat = null;
// For each small multiple…
function box (g) {
g.each(function (d, i) {
d = d.map(value).sort(d3.ascending);
var g = d3.select(this),
n = d.length,
min = d[0],
max = d[n - 1];
// Compute quartiles. Must return exactly 3 elements.
var quartileData = d.quartiles = quartiles(d);
// Compute whiskers. Must return exactly 2 elements, or null.
var whiskerIndices = whiskers && whiskers.call(this, d, i),
whiskerData = whiskerIndices && whiskerIndices.map(function (i) { return d[i]; });
// Compute outliers. If no whiskers are specified, all data are 'outliers'.
// We compute the outliers as indices, so that we can join across transitions!
var outlierIndices = whiskerIndices ?
d3.range(0, whiskerIndices[0]).concat(d3.range(whiskerIndices[1] + 1, n)) : d3.range(n);
// Compute the new x-scale.
var x1 = d3.scale.linear()
.domain(domain && domain.call(this, d, i) || [min, max])
.range([height, 0]);
// Retrieve the old x-scale, if this is an update.
var x0 = this.__chart__ || d3.scale.linear()
.domain([0, Infinity])
.range(x1.range());
// Stash the new scale.
this.__chart__ = x1;
// Note: the box, median, and box tick elements are fixed in number,
// so we only have to handle enter and update. In contrast, the outliers
// and other elements are variable, so we need to exit them! Variable
// elements also fade in and out.
// Update center line: the vertical line spanning the whiskers.
var center = g.selectAll('line.center')
.data(whiskerData ? [whiskerData] : []);
center.enter().insert('line', 'rect')
.attr('class', 'center')
.attr('x1', width / 2)
.attr('y1', function (d) { return x0(d[0]); })
.attr('x2', width / 2)
.attr('y2', function (d) { return x0(d[1]); })
.style('opacity', 1e-6)
.transition()
.duration(duration)
.delay(delay)
.style('opacity', 1)
.attr('y1', function (d) { return x1(d[0]); })
.attr('y2', function (d) { return x1(d[1]); });
center.transition()
.duration(duration)
.delay(delay)
.style('opacity', 1)
.attr('x1', width / 2)
.attr('x2', width / 2)
.attr('y1', function (d) { return x1(d[0]); })
.attr('y2', function (d) { return x1(d[1]); });
center.exit().transition()
.duration(duration)
.delay(delay)
.style('opacity', 1e-6)
.attr('y1', function (d) { return x1(d[0]); })
.attr('y2', function (d) { return x1(d[1]); })
.remove();
// Update innerquartile box.
var box = g.selectAll('rect.box')
.data([quartileData]);
box.enter().append('rect')
.attr('class', 'box')
.attr('x', 0)
.attr('y', function (d) { return x0(d[2]); })
.attr('width', width)
.attr('height', function (d) { return x0(d[0]) - x0(d[2]); })
.transition()
.duration(duration)
.delay(delay)
.attr('y', function (d) { return x1(d[2]); })
.attr('height', function (d) { return x1(d[0]) - x1(d[2]); });
box.transition()
.duration(duration)
.delay(delay)
.attr('width', width)
.attr('y', function (d) { return x1(d[2]); })
.attr('height', function (d) { return x1(d[0]) - x1(d[2]); });
// Update median line.
var medianLine = g.selectAll('line.median')
.data([quartileData[1]]);
medianLine.enter().append('line')
.attr('class', 'median')
.attr('x1', 0)
.attr('y1', x0)
.attr('x2', width)
.attr('y2', x0)
.transition()
.duration(duration)
.delay(delay)
.attr('y1', x1)
.attr('y2', x1);
medianLine.transition()
.duration(duration)
.delay(delay)
.attr('x1', 0)
.attr('x2', width)
.attr('y1', x1)
.attr('y2', x1);
// Update whiskers.
var whisker = g.selectAll('line.whisker')
.data(whiskerData || []);
whisker.enter().insert('line', 'circle, text')
.attr('class', 'whisker')
.attr('x1', 0)
.attr('y1', x0)
.attr('x2', width)
.attr('y2', x0)
.style('opacity', 1e-6)
.transition()
.duration(duration)
.delay(delay)
.attr('y1', x1)
.attr('y2', x1)
.style('opacity', 1);
whisker.transition()
.duration(duration)
.delay(delay)
.attr('x1', 0)
.attr('x2', width)
.attr('y1', x1)
.attr('y2', x1)
.style('opacity', 1);
whisker.exit().transition()
.duration(duration)
.delay(delay)
.attr('y1', x1)
.attr('y2', x1)
.style('opacity', 1e-6)
.remove();
// Update outliers.
var outlier = g.selectAll('circle.outlier')
.data(outlierIndices, Number);
outlier.enter().insert('circle', 'text')
.attr('class', 'outlier')
.attr('r', 5)
.attr('cx', width / 2)
.attr('cy', function (i) { return x0(d[i]); })
.style('opacity', 1e-6)
.transition()
.duration(duration)
.delay(delay)
.attr('cy', function (i) { return x1(d[i]); })
.style('opacity', 1);
outlier.transition()
.duration(duration)
.delay(delay)
.attr('cx', width / 2)
.attr('cy', function (i) { return x1(d[i]); })
.style('opacity', 1);
outlier.exit().transition()
.duration(duration)
.delay(delay)
.attr('cy', function (i) { return x1(d[i]); })
.style('opacity', 1e-6)
.remove();
// Compute the tick format.
var format = tickFormat || x1.tickFormat(8);
// Update box ticks.
var boxTick = g.selectAll('text.box')
.data(quartileData);
boxTick.enter().append('text')
.attr('class', 'box')
.attr('dy', '.3em')
.attr('dx', function (d, i) { return i & 1 ? 6 : -6; })
.attr('x', function (d, i) { return i & 1 ? width : 0; })
.attr('y', x0)
.attr('text-anchor', function (d, i) { return i & 1 ? 'start' : 'end'; })
.text(format)
.transition()
.duration(duration)
.delay(delay)
.attr('y', x1);
boxTick.transition()
.duration(duration)
.delay(delay)
.text(format)
.attr('x', function (d, i) { return i & 1 ? width : 0; })
.attr('y', x1);
// Update whisker ticks. These are handled separately from the box
// ticks because they may or may not exist, and we want don't want
// to join box ticks pre-transition with whisker ticks post-.
var whiskerTick = g.selectAll('text.whisker')
.data(whiskerData || []);
whiskerTick.enter().append('text')
.attr('class', 'whisker')
.attr('dy', '.3em')
.attr('dx', 6)
.attr('x', width)
.attr('y', x0)
.text(format)
.style('opacity', 1e-6)
.transition()
.duration(duration)
.delay(delay)
.attr('y', x1)
.style('opacity', 1);
whiskerTick.transition()
.duration(duration)
.delay(delay)
.text(format)
.attr('x', width)
.attr('y', x1)
.style('opacity', 1);
whiskerTick.exit().transition()
.duration(duration)
.delay(delay)
.attr('y', x1)
.style('opacity', 1e-6)
.remove();
});
d3.timer.flush();
}
box.width = function (x) {
if (!arguments.length) {
return width;
}
width = x;
return box;
};
box.height = function (x) {
if (!arguments.length) {
return height;
}
height = x;
return box;
};
box.tickFormat = function (x) {
if (!arguments.length) {
return tickFormat;
}
tickFormat = x;
return box;
};
box.duration = function (x) {
if (!arguments.length) {
return duration;
}
duration = x;
return box;
};
box.domain = function (x) {
if (!arguments.length) {
return domain;
}
domain = x === null ? x : d3.functor(x);
return box;
};
box.value = function (x) {
if (!arguments.length) {
return value;
}
value = x;
return box;
};
box.whiskers = function (x) {
if (!arguments.length) {
return whiskers;
}
whiskers = x;
return box;
};
box.quartiles = function (x) {
if (!arguments.length) {
return quartiles;
}
quartiles = x;
return box;
};
return box;
};
function boxWhiskers (d) {
return [0, d.length - 1];
}
function boxQuartiles (d) {
return [
d3.quantile(d, 0.25),
d3.quantile(d, 0.5),
d3.quantile(d, 0.75)
];
}
})();