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@HarryStevens HarryStevens/.block

Last active Dec 7, 2017
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The Wave
license: gpl-3.0

A somewhat unusual bar chart.

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body {
margin: 0 auto;
}
.label {
fill: #fff;
text-anchor: middle;
font-family: "Helvetica Neue", sans-serif;
font-size: .8em;
}
</style>
</head>
<body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/chroma-js/1.3.4/chroma.min.js"></script>
<script>
var alpha = "abcdefghijklmnopqrstuvwxyz".split(""),
odd = true,
interval = 300,
y_max = 2;
var margin = {top: 0, bottom: 20, left: 0, right: 1},
width = window.innerWidth - margin.left - margin.right,
height = window.innerHeight - margin.top - margin.bottom,
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 x = d3.scaleBand()
.rangeRound([0, width])
.domain(alpha)
.padding(.2);
var y = d3.scaleLinear()
.range([height, 0])
.domain([0, y_max]);
var c = chroma.scale(["steelblue", "violet", "tomato"]).domain([1, y_max]);
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0, " + height + ")")
.call(d3.axisBottom(x));
redraw(makeData());
d3.interval(function(){
redraw(makeData());
}, interval);
function redraw(data){
var bar = svg.selectAll(".bar")
.data(data, function(d){ return d.name; });
var label = svg.selectAll(".label")
.data(data, function(d){ return d.name; });
bar.transition().delay(calcDelay)
.attr("y", calcY)
.attr("height", calcHeight)
.style("fill", function(d){ return c(d.value); });
label.transition().delay(calcDelay)
.attr("y", calcY)
.text(function(d){ return d.value; });
bar.enter().append("rect")
.attr("class", "bar")
.attr("x", function(d){ return x(d.name); })
.attr("width", x.bandwidth())
.attr("y", calcY)
.attr("height", calcHeight)
.style("fill", function(d){ return c(d.value); })
label.enter().append("text")
.attr("class", "label")
.attr("x", function(d){ return x(d.name) + x.bandwidth() / 2; })
.attr("y", calcY)
.attr("dy", 18)
.text(function(d){ return d.value; });
function calcY(d){
return y(d.value);
}
function calcHeight(d){
return height - y(d.value);
}
function calcDelay(d, i){
return i * interval * 4 / data.length;
}
}
function makeData(){
odd = odd ? false : true;
return alpha.map(function(d, i){
return {
name: d,
value: odd ? +((alpha.length - i) / (alpha.length / y_max)).toFixed(2) : +((i + 1) / (alpha.length / y_max)).toFixed(2)
}
});
}
</script>
</body>
</html>
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