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D3.js: Animating Stacked-to-Grouped Bars
<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}
.stacked-chart-container {
position: relative;
}
.stacked-chart-container .controls {
position: absolute;
top: 24px;
left: 18px;
}
.stacked-chart .clickable {
cursor: pointer;
}
.stacked-chart-container .tooltip {
position: absolute;
font-size: 13px;
white-space: nowrap;
border: 1px solid black;
background-color: white;
pointer-events: none;
border-radius: 5px;
display: none;
}
.stacked-chart-container .tooltip-wrapper {
position: relative;
padding: 6px;
}
.stacked-chart-container .tooltip-wrapper:before {
content: "";
position: absolute;
width: 0;
height: 0;
bottom: -20px;
left: 50%;
transform: translateX(-50%);
border: 10px solid;
border-color: black transparent transparent transparent;
}
.stacked-chart-container .tooltip-wrapper:after {
content: "";
position: absolute;
width: 0;
height: 0;
bottom: -19px;
left: 50%;
transform: translateX(-50%);
border: 10px solid;
border-color: white transparent transparent transparent;
}
.stacked-chart-container .tooltip-table {
text-align: right;
}
.stacked-chart path,
.stacked-chart line,
.stacked-chart rect {
shape-rendering: crispEdges;
}
.stacked-chart text {
font: 10px sans-serif;
}
.stacked-chart .axis path,
.stacked-chart .axis line {
fill: none;
stroke: #000;
}
.stacked-chart .series-yes {
fill: steelblue;
}
.stacked-chart .series-no {
fill: #CCC;
}
.stacked-chart .series-maybe {
fill: #CD4638;
}
.stacked-chart .grid-lines {
fill: none;
stroke: lightgrey;
}
.stacked-chart .layer rect {
opacity: 0.8;
transition: opacity 0.5s ease;
}
.stacked-chart .layer rect.highlighted {
opacity: 1;
}
.stacked-chart .overlay {
opacity: 0;
}
.stacked-chart .series-box {
stroke-width: 2px;
}
.stacked-chart .series-yes .series-box {
stroke: steelblue;
}
.stacked-chart .series-no .series-box {
stroke: #CCC;
}
.stacked-chart .series-maybe .series-box {
stroke: #CD4638;
}
.stacked-chart .disabled .series-box {
fill-opacity: 0;
}
.stacked-chart .series-label {
fill: black;
text-anchor: end;
alignment-baseline: central;
}
</style>
<body>
<div class="stacked-chart-container js-stacked-chart-container">
<form class="controls">
<label><input type="radio" name="mode" value="stacked" checked>Stacked</label>
<label><input type="radio" name="mode" value="grouped">Grouped</label>
</form>
<svg class="stacked-chart js-stacked-chart"></svg>
<div class="tooltip js-tooltip">
<div class="tooltip-wrapper">
<table class="tooltip-table js-tooltip-table"></table>
</div>
</div>
</div>
<script type="text/x-underscore" class="js-tooltip-table-content">
<table>
<% _.each(bars, function (bar) { %>
<tr>
<td><%= bar.name %></td>
<td><%= bar.value %></td>
</tr>
<% }); %>
</table>
</script>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.5.2/underscore-min.js"></script>
<script src="http://code.jquery.com/jquery-2.1.1.min.js"></script>
<script type="text/javascript">
"use strict";
/*global $, d3, _ */
var seriesNames = ["Maybe", "No", "Yes"],
numSamples = 22,
numSeries = seriesNames.length,
data = seriesNames.map(function (name) {
return {
name: name,
values: bumpLayer(numSamples, 0.1)
};
}),
stack = d3.layout.stack().values(function (d) { return d.values; });
stack(data);
var chartMode = "stacked",
numEnabledSeries = numSeries,
lastHoveredBarIndex,
containerWidth = document.querySelector(".js-stacked-chart-container").clientWidth,
containerHeight = 500,
margin = {top: 70, right: 10, bottom: 20, left: 30},
width = containerWidth - margin.left - margin.right,
height = containerHeight - margin.top - margin.bottom,
widthPerStack = width / numSamples,
animationDuration = 400,
delayBetweenBarAnimation = 10,
numYAxisTicks = 8,
maxStackY = d3.max(data, function (series) { return d3.max(series.values, function (d) { return d.y0 + d.y; }); }),
paddingBetweenLegendSeries = 5,
legendSeriesBoxX = 0,
legendSeriesBoxY = 0,
legendSeriesBoxWidth = 15,
legendSeriesBoxHeight = 15,
legendSeriesHeight = legendSeriesBoxHeight + paddingBetweenLegendSeries,
legendSeriesLabelX = -5,
legendSeriesLabelY = legendSeriesBoxHeight / 2,
legendMargin = 10,
legendX = containerWidth - legendSeriesBoxWidth - legendMargin,
legendY = legendMargin,
overlayTopPadding = 20,
tooltipBottomMargin = 12;
var binsScale = d3.scale.ordinal()
.domain(d3.range(numSamples))
.rangeBands([0, width], 0.1, 0.05);
var xScale = d3.scale.linear()
.domain([0, numSamples])
.range([0, width]);
var yScale = d3.scale.linear()
.domain([0, maxStackY])
.range([height, 0]);
var heightScale = d3.scale.linear()
.domain([0, maxStackY])
.range([0, height]);
var xAxis = d3.svg.axis()
.scale(xScale) //binsScale)
.ticks(numSamples)
.orient("bottom");
var yAxis = d3.svg.axis()
.scale(yScale)
.orient("left");
var enabledSeries = function () { return _.reject(data, function (series) { return series.disabled; }); };
var seriesClass = function (seriesName) { return "series-" + seriesName.toLowerCase(); };
var layerClass = function (d) { return "layer " + seriesClass(d.name); };
var legendSeriesClass = function (d) { return "clickable " + seriesClass(d); };
var barDelay = function (d, i) { return i * delayBetweenBarAnimation; };
var joinKey = function (d) { return d.name; };
var stackedBarX = function (d) { return binsScale(d.x); };
var stackedBarY = function (d) { return yScale(d.y0 + d.y); };
var stackedBarBaseY = function (d) { return yScale(d.y0); };
var stackedBarWidth = binsScale.rangeBand();
var groupedBarX = function (d, i, j) { return binsScale(d.x) + j * groupedBarWidth(); };
var groupedBarY = function (d) { return yScale(d.y); };
var groupedBarBaseY = height;
var groupedBarWidth = function () { return binsScale.rangeBand() / numEnabledSeries; };
var barHeight = function (d) { return heightScale(d.y); };
var transitionStackedBars = function (selection) {
selection.transition()
.duration(animationDuration)
.delay(barDelay)
.attr("y", stackedBarY)
.attr("height", barHeight);
};
var svg = d3.select(".js-stacked-chart")
.attr("width", containerWidth)
.attr("height", containerHeight);
var mainArea = svg.append("g")
.attr("class", "main-area")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
mainArea.append("g")
.attr("class", "grid-lines")
.selectAll(".grid-line").data(yScale.ticks(numYAxisTicks))
.enter().append("line")
.attr("class", "grid-line")
.attr("x1", 0)
.attr("x2", width)
.attr("y1", yScale)
.attr("y2", yScale);
var layersArea = mainArea.append("g")
.attr("class", "layers");
var layers = layersArea.selectAll(".layer").data(data)
.enter().append("g")
.attr("class", layerClass);
layers.selectAll("rect").data(function (d) { return d.values; })
.enter().append("rect")
.attr("x", stackedBarX)
.attr("y", height)
.attr("width", stackedBarWidth)
.attr("height", 0)
.call(transitionStackedBars);
mainArea.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
mainArea.append("g")
.attr("class", "y axis")
.call(yAxis);
svg.append("rect")
.attr("class", "overlay")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")")
.attr("x", 0)
.attr("y", 0)
.attr("width", width)
.attr("height", height)
.on("mousemove", showTooltip)
.on("mouseout", hideTooltip);
var legendSeries = svg.append("g")
.attr("class", "legend")
.attr("transform", "translate(" + legendX + "," + legendY + ")")
.selectAll("g").data(seriesNames.reverse())
.enter().append("g")
.attr("class", legendSeriesClass)
.attr("transform", function (d, i) { return "translate(0," + (i * legendSeriesHeight) + ")"; })
.on("click", toggleSeries);
legendSeries.append("rect")
.attr("class", "series-box")
.attr("x", legendSeriesBoxX)
.attr("y", legendSeriesBoxY)
.attr("width", legendSeriesBoxWidth)
.attr("height", legendSeriesBoxHeight);
legendSeries.append("text")
.attr("class", "series-label")
.attr("x", legendSeriesLabelX)
.attr("y", legendSeriesLabelY)
.text(String);
d3.selectAll(".js-stacked-chart-container input").on("change", changeChartMode);
/**
* Toggles a certain series.
* @param {String} seriesName The name of the series to be toggled
*/
function toggleSeries (seriesName) {
var series,
isDisabling,
newData;
series = _.findWhere(data, { name: seriesName });
isDisabling = !series.disabled;
if (isDisabling === true && numEnabledSeries === 1) {
return;
}
d3.select(this).classed("disabled", isDisabling);
series.disabled = isDisabling;
newData = stack(enabledSeries());
numEnabledSeries = newData.length;
layers = layers.data(newData, joinKey);
if (isDisabling === true) {
removeSeries();
}
else {
addSeries();
}
}
/**
* Removes a certain series.
*/
function removeSeries () {
var layerToBeRemoved;
layerToBeRemoved = layers.exit();
if (chartMode === "stacked") {
removeStackedSeries(layerToBeRemoved);
}
else {
removeGroupedSeries(layerToBeRemoved);
}
}
/**
* Smoothly transitions and then removes a certain series when the chart is in `stacked` mode.
* @param {d3.selection} layerToBeRemoved The layer that contains the series' bars
*/
function removeStackedSeries (layerToBeRemoved) {
layerToBeRemoved.selectAll("rect").transition()
.duration(animationDuration)
.delay(barDelay)
.attr("y", stackedBarBaseY)
.attr("height", 0)
.call(endAll, function () {
layerToBeRemoved.remove();
});
transitionStackedBars(layers.selectAll("rect"));
}
/**
* Smoothly transitions and then removes a certain series when the chart is in `grouped` mode.
* @param {d3.selection} layerToBeRemoved The layer that contains the series' bars
*/
function removeGroupedSeries (layerToBeRemoved) {
layerToBeRemoved.selectAll("rect").transition()
.duration(animationDuration)
.delay(barDelay)
.attr("y", groupedBarBaseY)
.attr("height", 0)
.call(endAll, function () {
layerToBeRemoved.remove();
layers.selectAll("rect").transition()
.duration(animationDuration)
.delay(barDelay)
.attr("x", groupedBarX)
.attr("width", groupedBarWidth);
});
}
/**
* Adds a certain series.
*/
function addSeries () {
var newLayer;
newLayer = layers.enter().append("g")
.attr("class", layerClass);
if (chartMode === "stacked") {
addStackedSeries(newLayer);
}
else {
addGroupedSeries(newLayer);
}
}
/**
* Smoothly transitions and adds a certain series when the chart is in `stacked` mode.
* @param {d3.selection} newLayer The new layer to be added
*/
function addStackedSeries (newLayer) {
newLayer.selectAll("rect").data(function (d) { return d.values; })
.enter().append("rect")
.attr("x", stackedBarX)
.attr("y", stackedBarBaseY)
.attr("width", stackedBarWidth)
.attr("height", 0);
transitionStackedBars(layers.selectAll("rect"));
}
/**
* Smoothly transitions and adds a certain series when the chart is in `grouped` mode.
* @param {d3.selection} newLayer The new layer to be added
*/
function addGroupedSeries (newLayer) {
var newBars;
layers.selectAll("rect").transition()
.duration(animationDuration)
.delay(barDelay)
.attr("x", groupedBarX)
.attr("width", groupedBarWidth)
.call(endAll, function () {
newBars = newLayer.selectAll("rect").data(function (d) { return d.values; })
.enter().append("rect")
.attr("y", groupedBarBaseY)
.attr("width", groupedBarWidth)
.attr("height", 0);
layers.selectAll("rect").attr("x", groupedBarX);
newBars.transition()
.duration(animationDuration)
.delay(barDelay)
.attr("y", groupedBarY)
.attr("height", barHeight);
});
}
/**
* Changes the chart to the selected mode: `stacked` or `grouped`.
* In `stacked` mode, the bars of each bin are stacked together.
* In `grouped` mode, the bars of each bin are placed side by side.
*/
function changeChartMode() {
chartMode = this.value;
if (chartMode === "stacked") {
stackBars();
}
else {
groupBars();
}
}
/**
* Smoothly transitions the chart to `stacked` mode.
* In this mode, the bars of each bin are stacked together.
*/
function stackBars() {
layers.selectAll("rect").transition()
.duration(animationDuration)
.delay(barDelay)
.attr("y", stackedBarY)
.transition()
.duration(animationDuration)
.attr("x", stackedBarX)
.attr("width", stackedBarWidth);
}
/**
* Smoothly transitions the chart to `grouped` mode.
* In this mode, the bars of each bin are placed side by side.
*/
function groupBars() {
layers.selectAll("rect").transition()
.duration(animationDuration)
.delay(barDelay)
.attr("x", groupedBarX)
.attr("width", groupedBarWidth)
.transition()
.duration(animationDuration)
.attr("y", groupedBarY);
}
/**
* Shows the tooltip.
*/
function showTooltip() {
var hoveredBarIndex,
tooltip;
hoveredBarIndex = (d3.mouse(this)[0] / widthPerStack) | 0;
if (hoveredBarIndex === lastHoveredBarIndex) {
return;
}
lastHoveredBarIndex = hoveredBarIndex;
layers.selectAll("rect").classed("highlighted", function (d, i) { return (i === hoveredBarIndex); });
tooltip = $(".js-tooltip");
tooltip.find(".js-tooltip-table").html(tooltipContent());
tooltip.css({
top: margin.top + highestBinBarHeight() - tooltip.outerHeight() - tooltipBottomMargin,
left: margin.left + (hoveredBarIndex * widthPerStack) + (widthPerStack / 2) - (tooltip.outerWidth() / 2),
}).fadeIn();
}
function tooltipContent () {
var bars, template;
bars = [];
layers.each(function (d) {
bars.unshift({ name: d.name, value: d.values[lastHoveredBarIndex].y.toFixed(4) });
});
template = $(".js-tooltip-table-content").html();
return _.template(template, { bars: bars });
}
/**
* Hides the tooltip.
*/
function hideTooltip () {
$(".js-tooltip").stop().hide();
layers.selectAll("rect")
.filter(function (d, i) { return (i === lastHoveredBarIndex); })
.classed("highlighted", false);
lastHoveredBarIndex = undefined;
}
/**
* Calculates the height of the highest (not tallest) bar within a certain bin.
* @return {Number} The height, in pixels, of the highest bar within a certain bin
*/
function highestBinBarHeight() {
var bars,
highestGroupBar;
if (chartMode === "stacked") {
highestGroupBar = _.last(layers.data()).values[lastHoveredBarIndex];
return yScale(highestGroupBar.y0 + highestGroupBar.y);
}
else {
bars = _.map(layers.data(), function (series) { return series.values[lastHoveredBarIndex]; });
highestGroupBar = _.max(bars, function (bar) { return bar.y; });
return yScale(highestGroupBar.y);
}
}
/**
* Calls a function at the end of **all** transitions.
* @param {d3.transition} transition A D3 transition
* @param {Function} callback The function to be called at the end of **all** transitions
*/
function endAll (transition, callback) {
var n;
if (transition.empty()) {
callback();
}
else {
n = transition.size();
transition.each("end", function () {
n--;
if (n === 0) {
callback();
}
});
}
}
// 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 {x: i, y: Math.max(0, d)}; });
}
</script>
</body>
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