Stacked-to-Grouped Bars II

This takes the Stacked-to-Grouped Bars one step further by adding a sequenced transition for a normalized stacked bar chart, which shows the values for each column as a percentage rather than absolute numbers. I also added the x-axis since the scale changes for each view.

Modification of chornbaker's block: Stacked-to-Grouped Bars

Originally forked from mbostock's block: Stacked-to-Grouped Bars

Updated for D3 4.0

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

body {
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    margin: auto;
    position: relative;
    width: 960px;
}

text {
    font: 10px sans-serif;
}

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

form {
    position: absolute;
    right: 10px;
    top: 10px;
}

</style>
<form>
    <label><input type="radio" name="mode" value="percent"> Percent</label>
    <label><input type="radio" name="mode" value="grouped"> Grouped</label>
    <label><input type="radio" name="mode" value="stacked" checked> Stacked</label>
</form>
<script src="//d3js.org/d3.v4.min.js"></script>
<script>

var n = 4, // number of layers
    m = 58, // number of samples per layer
    stack = d3.stack(),
    data = d3.range(n).map(function() { return bumpLayer(m, .1); });

var formatPercent = d3.format(".0%");
var formatNumber = d3.format("");

// transpose data
data = data[0].map(function(col, i) { 
    return data.map(function(row) { 
        return row[i] 
    })
});

var margin = {top: 40, right: 10, bottom: 20, left: 35},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var x = d3.scaleBand()
    .domain(d3.range(m))
    .rangeRound([0, width])
    .padding(0.1)
    .align(0.1);

var y = d3.scaleLinear()
    .domain([0, yStackMax])
    .rangeRound([height, 0]);

var color = d3.scaleLinear()
    .domain([0, n - 1])
    .range(["#aad", "#556"]);

var xAxis = d3.axisBottom()
    .scale(x)
    .tickSize(0)
    .tickPadding(6);

var yAxis = d3.axisLeft()
    .scale(y)
    .tickSize(2)
    .tickPadding(6);

var svg = d3.select("body").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")
    .attr("id", function(d) { return d.key; })
    .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) { return x(i); })
    .attr("y", height)
    .attr("width", x.bandwidth())
    .attr("height", 0);

rect.transition()
    .delay(function(d, i) {return i * 10; })
    .attr("y", function(d) { return y(d[1]); })
    .attr("height", function(d) { return y(d[0]) - y(d[1]); });

svg.append("g")
    .attr("class", "x axis")
    .attr("transform", "translate(0," + height + ")")
    .call(xAxis);

svg.append("g")
    .attr("class", "y axis")
    .attr("transform", "translate(" + 0 + ",0)")
    .style("font-size", "10px")
    .call(yAxis);

d3.selectAll("input").on("change", change);

var timeout = setTimeout(function() {
    d3.select("input[value=\"grouped\"]").property("checked", true).each(change);
    setTimeout(function() {
        d3.select("input[value=\"percent\"]").property("checked", true).each(change);
    }, 2000);
}, 2000);

function change() {
    clearTimeout(timeout);
    if (this.value === "grouped") transitionGrouped();
    else if (this.value === "stacked") transitionStacked();
    else if (this.value === "percent") transitionPercent();

}

function transitionGrouped() {
    y.domain([0, yGroupMax]);

rect.transition()
        .duration(500)
        .delay(function(d, i) { return i * 10; })
        .attr("x", function(d, i, j) { return x(i) + x.bandwidth() / n * parseInt(this.parentNode.id); })
        .attr("width", x.bandwidth() / n)
    .transition()
        .attr("y", function(d) { return height - (y(d[0]) - y(d[1])); })
        .attr("height", function(d) { return y(d[0]) - y(d[1]); });

yAxis.tickFormat(formatNumber)
    svg.selectAll(".y.axis").transition()
        .delay(500)
        .duration(500)
        .call(yAxis)
}

function transitionStacked() {
    y.domain([0, yStackMax]);

rect.transition()
        .duration(500)
        .delay(function(d, i) { return i * 10; })
        .attr("y", function(d) { return y(d[1]); })
        .attr("height", function(d) { return y(d[0]) - y(d[1]); })
    .transition()
        .attr("x", function(d, i) { return x(i); })
        .attr("width", x.bandwidth());

yAxis.tickFormat(formatNumber)
    svg.selectAll(".y.axis").transition()
        .delay(500)
        .duration(500)
        .call(yAxis)

}

function transitionPercent() {
    y.domain([0, 1]);

rect.transition()
        .duration(500)
        .delay(function(d, i) { return i * 10; })
        .attr("y", function(d) { 
            var total = d3.sum(d3.values(d.data)); 
            return y(d[1] / total); })
        .attr("height", function(d) { 
            var total = d3.sum(d3.values(d.data));
            return y(d[0] / total) - y(d[1] / total); })
    .transition()
        .attr("x", function(d, i) { return x(i); })
        .attr("width", x.bandwidth());

yAxis.tickFormat(formatPercent)

svg.selectAll(".y.axis").transition()
        .delay(500)
        .duration(500)
        .call(yAxis)

}

// Inspired by Lee Byron's test data generator.
function bumpLayer(n, o) {

function bump(a) {
    var x = 1 / (.1 + Math.random()),
        y = 2 * Math.random() - .5,
        z = 10 / (.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 Math.max(0, d); });
}

</script>

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