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August 10, 2016 01:09
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Animated bar chart transitions
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
.axis .domain { | |
display: none; | |
} | |
.tick line { | |
stroke: #CCC; | |
} | |
rect { | |
fill: #65a4e0; | |
} | |
</style> | |
<svg width="960" height="500"> | |
<g class="margin"> | |
<g class="x axis"></g> | |
<g class="content"></g> | |
</g> | |
</svg> | |
<script src="//d3js.org/d3.v4.min.js"></script> | |
<script> | |
var margin = { | |
top: 0, | |
right: 8, | |
bottom: 24, | |
left: 8 | |
}; | |
var bandwidth = 10; | |
var gutter = 2; | |
// Just some random numbers for the charts | |
var data = [ | |
[22, 19, 7, 6, 4], | |
[29, 20, 19, 19, 12, 8, 2, 1] | |
]; | |
var index = 0; | |
var svg = d3.select("svg"), | |
width = +svg.attr("width") - margin.left - margin.right, | |
height = +svg.attr("height") - margin.top - margin.bottom; | |
svg.select(".margin").attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
var x = d3.scaleLinear().range([0, width]); | |
var xAxis = d3.axisBottom(x); | |
var g = svg.select(".content"), | |
gX = svg.select(".x.axis"); | |
function update(group) { | |
x.domain([0, d3.max(data[group])]); | |
var t = d3.transition() | |
.duration(750) | |
.ease(d3.easeCubicOut); | |
var bar = g.selectAll("rect") | |
.data(data[group], function (d, i) { return d + "-" + i; }); | |
bar.exit() | |
.transition(t).delay(function (d, i) { return i * 20; }) | |
.attr("x", function () { return +d3.select(this).attr("width"); }) | |
.attr("width", 0) | |
.remove(); | |
bar.enter().append("rect") | |
.attr("y", function (d, i) { return i * (bandwidth + gutter); }) | |
.attr("height", bandwidth) | |
.merge(bar).transition(t).delay(function (d, i) { return 175 + i * 20; }) | |
.attr("width", function (d) { return x(d); }); | |
gX.transition(t) | |
.call(xAxis.tickSize(data[group].length * (bandwidth + gutter) - gutter)); | |
} | |
window.setTimeout(function tick() { | |
update(index); | |
index = (index + 1) % 2; | |
window.setTimeout(tick, 2000); | |
}, 0); | |
</script> |
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