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292 lines
8.9 KiB
292 lines
8.9 KiB
3 years ago
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/* ------------------------------------------------------------------------------
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*
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* # D3.js - stacked and multiple bars
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*
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* Demo d3.js bar chart setup with animated transition between stacked and multiple bars
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*
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* Version: 1.0
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* Latest update: August 1, 2015
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*
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* ---------------------------------------------------------------------------- */
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$(function () {
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// Create Uniform checkbox
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$(".stacked-multiple").uniform({
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radioClass: 'choice'
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});
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// Initialize chart
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stackedMultiples('#d3-bar-stacked-multiples', 400);
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// Chart setup
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function stackedMultiples(element, height) {
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// Basic setup
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// ------------------------------
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// Define main variables
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var d3Container = d3.select(element),
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margin = {top: 5, right: 20, bottom: 20, left: 60},
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width = d3Container.node().getBoundingClientRect().width - margin.left - margin.right,
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height = height - margin.top - margin.bottom - 5;
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// Format data
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var parseDate = d3.time.format("%Y-%m").parse,
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formatYear = d3.format("02d"),
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formatDate = function(d) { return "Q" + ((d.getMonth() / 3 | 0) + 1) + formatYear(d.getFullYear() % 100); };
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// Construct scales
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// ------------------------------
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// Horizontal
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var x = d3.scale.ordinal()
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.rangeRoundBands([0, width], .2);
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// Vertical
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var y = d3.scale.ordinal()
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.rangeRoundBands([height, 0]);
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var y0 = d3.scale.ordinal()
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.rangeRoundBands([height, 0]);
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var y1 = d3.scale.linear();
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// Colors
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var color = d3.scale.category20();
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// Create axes
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// ------------------------------
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// Horizontal
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var xAxis = d3.svg.axis()
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.scale(x)
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.orient("bottom")
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.tickFormat(formatDate);
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// Vertical
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var yAxis = d3.svg.axis()
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.scale(y)
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.orient("left")
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.ticks(10, "%");
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// Create chart
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// ------------------------------
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// Add SVG element
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var container = d3Container.append("svg");
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// Add SVG group
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var svg = container
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.attr("width", width + margin.left + margin.right)
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.attr("height", height + margin.top + margin.bottom)
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.append("g")
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.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
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// Construct chart layout
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// ------------------------------
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// Nest
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var nest = d3.nest()
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.key(function(d) { return d.browser; });
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// Stack
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var stack = d3.layout.stack()
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.values(function(d) { return d.values; })
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.x(function(d) { return d.date; })
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.y(function(d) { return d.value; })
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.out(function(d, y0) { d.valueOffset = y0; });
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// Load data
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// ------------------------------
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d3.tsv("assets/demo_data/d3/bars/bars_stacked_multiple.tsv", function(error, data) {
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// Pull out values
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data.forEach(function(d) {
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d.date = parseDate(d.date);
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d.value = +d.value;
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});
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// Nest values
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var dataByGroup = nest.entries(data);
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// Set input domains
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// ------------------------------
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// Stack
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stack(dataByGroup);
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// Horizontal
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x.domain(dataByGroup[0].values.map(function(d) { return d.date; }));
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// Vertical
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y0.domain(dataByGroup.map(function(d) { return d.key; }));
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y1.domain([0, d3.max(data, function(d) { return d.value; })]).range([y0.rangeBand(), 0]);
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//
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// Append chart elements
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//
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// Add bars
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// ------------------------------
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// Group bars
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var group = svg.selectAll(".d3-bar-group")
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.data(dataByGroup)
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.enter()
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.append("g")
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.attr("class", "d3-bar-group")
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.attr("transform", function(d) { return "translate(0," + y0(d.key) + ")"; });
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// Append text
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group.append("text")
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.attr("class", "d3-group-label")
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.attr("x", -12)
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.attr("y", function(d) { return y1(d.values[0].value / 2); })
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.attr("dy", ".35em")
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.style("text-anchor", "end")
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.text(function(d) { return d.key; });
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// Add bars
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group.selectAll(".d3-bar")
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.data(function(d) { return d.values; })
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.enter()
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.append("rect")
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.attr("class", "d3-bar")
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.attr("x", function(d) { return x(d.date); })
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.attr("y", function(d) { return y1(d.value); })
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.attr("width", x.rangeBand())
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.attr("height", function(d) { return y0.rangeBand() - y1(d.value); })
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.style("fill", function(d) { return color(d.browser); });
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// Append axes
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// ------------------------------
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// Horizontal
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group.filter(function(d, i) { return !i; }).append("g")
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.attr("class", "d3-axis d3-axis-horizontal d3-axis-strong")
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.attr("transform", "translate(0," + (y0.rangeBand() + 1) + ")")
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.call(xAxis);
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// Vertical
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var verticalAxis = svg.append("g")
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.attr("class", "d3-axis d3-axis-vertical d3-axis-strong")
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.call(yAxis);
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// Appent text label
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verticalAxis.append("text")
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.attr('class', 'browser-label')
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.attr("x", -12)
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.attr("y", 12)
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.attr("dy", ".71em")
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.style("text-anchor", "end")
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.style("fill", "#999")
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.style("font-size", 12)
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.text("Browser");
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// Setup layout change
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// ------------------------------
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// Add change event
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d3.selectAll(".stacked-multiple").on("change", change);
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// Change value on page load
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var timeout = setTimeout(function() {
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d3.select("input[value=\"stacked\"]").property("checked", true).each(change);
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$.uniform.update();
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}, 2000);
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// Change function
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function change() {
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clearTimeout(timeout);
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if (this.value === "multiples") transitionMultiples();
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else transitionStacked();
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}
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// Transition to multiples
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function transitionMultiples() {
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var t = svg.transition().duration(750),
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g = t.selectAll(".d3-bar-group").attr("transform", function(d) { return "translate(0," + y0(d.key) + ")"; });
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g.selectAll(".d3-bar").attr("y", function(d) { return y1(d.value); });
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g.select(".d3-group-label").attr("y", function(d) { return y1(d.values[0].value / 2); })
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}
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// Transition to stacked
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function transitionStacked() {
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var t = svg.transition().duration(750),
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g = t.selectAll(".d3-bar-group").attr("transform", "translate(0," + y0(y0.domain()[0]) + ")");
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g.selectAll(".d3-bar").attr("y", function(d) { return y1(d.value + d.valueOffset) });
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g.select(".d3-group-label").attr("y", function(d) { return y1(d.values[0].value / 2 + d.values[0].valueOffset); })
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}
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});
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// Resize chart
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// ------------------------------
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// Call function on window resize
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$(window).on('resize', resize);
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// Call function on sidebar width change
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$('.sidebar-control').on('click', resize);
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// Resize function
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//
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// Since D3 doesn't support SVG resize by default,
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// we need to manually specify parts of the graph that need to
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// be updated on window resize
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function resize() {
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// Layout variables
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width = d3Container.node().getBoundingClientRect().width - margin.left - margin.right;
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// Layout
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// -------------------------
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// Main svg width
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container.attr("width", width + margin.left + margin.right);
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// Width of appended group
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svg.attr("width", width + margin.left + margin.right);
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// Axes
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// -------------------------
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// Horizontal range
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x.rangeRoundBands([0, width], .2);
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// Horizontal axis
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svg.selectAll('.d3-axis-horizontal').call(xAxis);
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// Chart elements
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// -------------------------
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// Line path
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svg.selectAll('.d3-bar').attr("x", function(d) { return x(d.date); }).attr("width", x.rangeBand());
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}
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}
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});
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