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jthomassie/index.html

Last active August 29, 2015 13:57
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Histogram: grouped, stacked, normalized
Raw
index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
font-size: 13px;
margin: auto;
position: relative;
width: 960px;
color: #333;
}
text {
font: 10px sans-serif;
fill: #666;
}
.axis path,
.axis line {
fill: none;
stroke: #666;
shape-rendering: crispEdges;
}
.form {
position: relative;
float: right;
right: 10px;
top: 10px;
margin: 40px 40px 0 0;
}
label{
margin: 6px;
}
</style>
<div class="form">
<label><input type="radio" name="mode" value="grouped" checked> Grouped</label>
<label><input type="radio" name="mode" value="stacked"> Stacked</label>
<label><input type="radio" name="mode" value="normalized"> Normalized</label>
</div>
<div id="chart"></div>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var n = 5, // number of layers
m = 65; // number of samples per layer
var transitionDuration = 250; // transition duration
var stack = d3.layout.stack(),
layers = stack(d3.range(n).map(function() { return bumpLayer(m, 0.6); })),
yGroupMax = d3.max(layers, function(layer) { return d3.max(layer, function(d) { return d.y; }); }),
yStackMax = d3.max(layers, function(layer) { return d3.max(layer, function(d) { return d.y0 + d.y; }); });
console.log(layers);
var margin = {top: 40, right: 10, bottom: 20, left: 30},
width = 960 - margin.left - margin.right,
height = 350 - margin.top - margin.bottom;
var color = d3.scale.linear()
.domain([0, n - 1])
.range(["#ffc014", "#990000"]);
var x = d3.scale.ordinal()
.domain(d3.range(m))
.rangeRoundBands([0, width], 0.1);
var y = d3.scale.linear()
.domain([0, yGroupMax])
.range([height, 0]);
var xAxis = d3.svg.axis()
.scale(x)
.tickSize(0)
.tickPadding(6)
.orient("bottom");
var yAxis = d3.svg.axis()
.scale(y)
.tickSize(0)
.tickPadding(6)
.orient("left");
var svg = d3.select("#chart").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 + ")");
var layer = svg.selectAll(".layer")
.data(layers)
.enter().append("g")
.attr("class", "layer")
.style("fill", function(d, i) { return color(i); });
var rect = layer.selectAll("rect")
.data(function(d) { return d; })
.enter().append("rect")
.attr("x", function(d, i, j) {
return x(d.x) + x.rangeBand() / n * j;
})
.attr("y", height)
.attr("width", x.rangeBand() / n)
.attr("height", 0);
rect.transition()
.duration(transitionDuration)
.attr("y", function(d) { return y(d.y); })
.attr("height", function(d) { return height - y(d.y); });
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
svg.append("g")
.attr("class", "y axis")
.call(yAxis);
d3.selectAll("input").on("change", change);
function change() {
if (this.value === "grouped") {
transitionGrouped();
}
if (this.value === "stacked") {
transitionStacked();
}
if (this.value === "normalized") {
transitionNormalized();
}
}
function transitionGrouped() {
y.domain([0, yGroupMax]).nice();
rect.transition()
.duration(transitionDuration)
.attr("x", function(d, i, j) {
return x(d.x) + x.rangeBand() / n * j;
})
.attr("width", x.rangeBand() / n)
.transition()
.attr("y", function(d) {
return y(d.y);
})
.attr("height", function(d) {
return height - y(d.y);
});
// update the y-axis
svg.select('g.y.axis')
.transition()
.duration(transitionDuration)
.call(yAxis);
}
function transitionStacked() {
y.domain([0, yStackMax]).nice();
rect.transition()
.duration(transitionDuration)
.attr("y", function(d) {
return y(d.y0 + d.y);
})
.attr("height", function(d) {
return y(d.y0) - y(d.y0 + d.y);
})
.transition()
.attr("x", function(d) {
return x(d.x);
})
.attr("width", x.rangeBand());
// update the y-axis
svg.select('g.y.axis')
.transition()
.duration(transitionDuration)
.call(yAxis);
}
function transitionNormalized() {
function total(i) {
var t = 0;
for (var j = 0; j < n; j++) {
t = t + layers[j][i].y;
}
return t;
}
y.domain([0, 100]);
rect.transition()
.duration(transitionDuration)
.attr("y", function(d,i,j) {
var t = total(i);
var yy = y((d.y0 + d.y)/t*100);
return yy;
})
.attr("height", function(d,i) {
var t = total(i);
var hh = y(d.y0/t*100) - y((d.y0 + d.y)/t*100);
return hh;
})
.transition()
.attr("x", function(d) {
return x(d.x);
})
.transition()
.attr("x", function(d) {
return x(d.x);
})
.attr("width", x.rangeBand());
// update the y-axis
svg.select('g.y.axis')
.transition()
.duration(transitionDuration)
.call(yAxis);
}
// random data generator - inspired by Lee Byron's test data generator
function bumpLayer(n, o) {
function bump(a) {
var x = 1 / ( 0.1 + Math.random() ),
y = 2 * Math.random() - 0.5,
z = 10 / ( 0.1 + Math.random() );
for ( var i = 0; i < n; i++ ) {
var w = ( i / n - y ) * z;
a[i] += x * Math.exp(-w * w);
}
}
var a = [], i;
for (i = 0; i < n; ++i) {
a[i] = o + o * Math.random();
}
for (i = 0; i < 5; ++i) {
bump(a);
}
return a.map(function(d, i) {
return {x: i, y: Math.max(0, d)};
});
}
</script>
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