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areologist/.block

Last active June 30, 2017 14:06
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column chart
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.block
license: mit
Raw
index.html
<!DOCTYPE html>
<head>
<meta charset="utf-8">
<script src="https://d3js.org/d3.v4.min.js"></script>
<style>
body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
.chart {
background-color: #f6fafc;
border: 1px solid #333;
}
.bar {
fill: steelblue;
opacity: 0.7;
}
.bar:hover {
opacity: 1;
}
.tick text {
font-size: 10px;
}
</style>
</head>
<body>
<div class="chart"></div>
<script>
const margin = { top: 25, right: 35, bottom: 100, left: 35 };
const width = 550 - margin.left - margin.right;
const height = 325 - margin.top - margin.bottom;
const fullWidth = width + margin.left + margin.right;
const fullHeight = height + margin.top + margin.bottom;
const data = [
{score: 63, subject: 'Mathematics'},
{score: 82, subject: 'Geography'},
{score: 74, subject: 'Spelling'},
{score: 97, subject: 'Reading'},
{score: 52, subject: 'Science'},
{score: 74, subject: 'Chemistry'},
{score: 97, subject: 'Physics'},
{score: 52, subject: 'ASL'}
];
const svg = d3.select('.chart')
.append('svg')
.attr('width', width + margin.left + margin.right)
.attr('height', height + margin.top + margin.bottom)
.call(responsivefy)
.append('g')
.attr('transform', 'translate(' + margin.left + ', ' + margin.top + ')');
const xScale = d3.scaleBand()
.padding(0.2)
.domain(data.map(d => d.subject))
.range([0, width]);
const yScale = d3.scaleLinear()
.domain([0, 100])
.range([height, 0]);
const yAxis = d3.axisLeft(yScale)
.ticks(10);
// add the axis by passing it into d3.call (and wrap it in a <g>)
svg.append('g')
.call(yAxis);
const xAxis = d3.axisBottom(xScale);
svg.append('g')
.attr('transform', `translate(0, ${height})`)
.call(xAxis)
.selectAll('text')
.style('text-anchor', 'end')
.attr('transform', 'rotate(-45)');
svg.selectAll('rect')
.data(data)
.enter()
.append('rect')
.attr('x', d => xScale(d.subject))
.attr('y', d => yScale(d.score))
.attr('width', xScale.bandwidth())
.attr('height', d => height - yScale(d.score))
.attr('class', 'bar');
function responsivefy(svg) {
// get container + svg aspect ratio
var container = d3.select(svg.node().parentNode),
width = parseInt(svg.style("width")),
height = parseInt(svg.style("height")),
aspect = width / height;
// add viewBox and preserveAspectRatio properties,
// and call resize so that svg resizes on inital page load
svg.attr("viewBox", "0 0 " + width + " " + height)
.attr("preserveAspectRatio", "xMinYMid")
.call(resize);
// to register multiple listeners for same event type,
// you need to add namespace, i.e., 'click.foo'
// necessary if you call invoke this function for multiple svgs
// api docs: https://github.com/mbostock/d3/wiki/Selections#on
d3.select(window).on("resize." + container.attr("id"), resize);
// get width of container and resize svg to fit it
function resize() {
var targetWidth = parseInt(container.style("width"));
svg.attr("width", targetWidth);
svg.attr("height", Math.round(targetWidth / aspect));
}
}
</script>
</body>
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