chart = {
const svg = d3.create("svg")
.attr("viewBox", [-width / 2, -height / 2, width, height]);
const chords = chord(data);
const group = svg.append("g")
.attr("font-size", 10)
.attr("font-family", "sans-serif")
.selectAll("g")
.data(chords.groups)
.join("g");
group.append("path")
.attr("fill", d => color(names[d.index]))
.attr("d", arc);
group.append("title")
.text(d => `${names[d.index]}
${formatValue(d.value)}`);
const groupTick = group.append("g")
.selectAll("g")
.data(ticks)
.join("g")
.attr("transform", d => `rotate(${d.angle * 180 / Math.PI - 90}) translate(${outerRadius},0)`);
groupTick.append("line")
.attr("stroke", "currentColor")
.attr("x2", 6);
groupTick.append("text")
.attr("x", 8)
.attr("dy", "0.35em")
.attr("transform", d => d.angle > Math.PI ? "rotate(180) translate(-16)" : null)
.attr("text-anchor", d => d.angle > Math.PI ? "end" : null)
.text(d => formatValue(d.value));
group.select("text")
.attr("font-weight", "bold")
.text(function(d) {
return this.getAttribute("text-anchor") === "end"
? `↑ ${names[d.index]}`
: `${names[d.index]} ↓`;
});
svg.append("g")
.attr("fill-opacity", 0.8)
.selectAll("path")
.data(chords)
.join("path")
.style("mix-blend-mode", "multiply")
.attr("fill", d => color(names[d.source.index]))
.attr("d", ribbon)
.append("title")
.text(d => `${formatValue(d.source.value)} ${names[d.target.index]} → ${names[d.source.index]}${d.source.index === d.target.index ? "" : `\n${formatValue(d.target.value)} ${names[d.source.index]} → ${names[d.target.index]}`}`);
return svg.node();
}
data = Object.assign([
[11975, 5871, 8916, 2868],
[ 1951, 10048, 2060, 6171],
[ 8010, 16145, 8090, 8045],
[ 1013, 990, 940, 6907]], {
names: ["Black", "Blonde", "Brown", "Red"],
colors: ["#545454", "#FFE9AD", "#B9A07F", "#F79566"]
})
names = data.names === undefined ? d3.range(data.length) : data.names
colors = data.colors === undefined ? d3.quantize(d3.interpolateRainbow, names.length) : data.colors
function ticks({startAngle, endAngle, value}) {
const k = (endAngle - startAngle) / value;
return d3.range(0, value, tickStep).map(value => {
return {value, angle: value * k + startAngle};
});
}
tickStep = d3.tickStep(0, d3.sum(data.flat()), 100)
formatValue = d3.format("0")
chord = d3.chord()
.padAngle(10 / innerRadius)
.sortSubgroups(d3.descending)
.sortChords(d3.descending)
arc = d3.arc()
.innerRadius(innerRadius)
.outerRadius(outerRadius)
ribbon = d3.ribbon()
.radius(innerRadius - 1)
.padAngle(1 / innerRadius)
color = d3.scaleOrdinal(names, colors)
outerRadius = Math.min(width, height) * 0.5 - 60
innerRadius = outerRadius - 10
height = width
d3 = require("d3@6")
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.
