chart = {
const root = partition(data);
const svg = d3.create("svg");
svg.append("g")
.attr("fill-opacity", 0.6)
.selectAll("path")
.data(root.descendants().filter(d => d.depth))
.join("path")
.attr("fill", d => { while (d.depth > 1) d = d.parent; return color(d.data.name); })
.attr("d", arc)
.append("title")
.text(d => `${d.ancestors().map(d => d.data.name).reverse().join("/")}\n${format(d.value)}`);
svg.append("g")
.attr("pointer-events", "none")
.attr("text-anchor", "middle")
.attr("font-size", 10)
.attr("font-family", "sans-serif")
.selectAll("text")
.data(root.descendants().filter(d => d.depth && (d.y0 + d.y1) / 2 * (d.x1 - d.x0) > 10))
.join("text")
.attr("transform", function(d) {
const x = (d.x0 + d.x1) / 2 * 180 / Math.PI;
const y = (d.y0 + d.y1) / 2;
return `rotate(${x - 90}) translate(${y},0) rotate(${x < 180 ? 0 : 180})`;
})
.attr("dy", "0.35em")
.text(d => d.data.name);
return svg.attr("viewBox", autoBox).node();
}
function autoBox() {
document.body.appendChild(this);
const {x, y, width, height} = this.getBBox();
document.body.removeChild(this);
return [x, y, width, height];
}
data = d3.json("https://raw.githubusercontent.com/fergustaylor/dev/master/antibiotics/Formulary2.json")
partition = data => d3.partition()
.size([2 * Math.PI, radius])
(d3.hierarchy(data)
.sum(d => d.value)
.sort((a, b) => b.value - a.value))
color = d3.scaleOrdinal(d3.quantize(d3.interpolateRainbow, data.children.length + 1))
format = d3.format(",d")
width = 975
radius = width / 2
arc = d3.arc()
.startAngle(d => d.x0)
.endAngle(d => d.x1)
.padAngle(d => Math.min((d.x1 - d.x0) / 2, 0.005))
.padRadius(radius / 2)
.innerRadius(d => d.y0)
.outerRadius(d => d.y1 - 1)
d3 = require("d3@5")
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
