chart = {
root.each(d => (d.current = d));
const svg = d3
.create("svg")
.attr("viewBox", [0, 0, width, width])
.style("font", "10px sans-serif");
const g = svg
.append("g")
.attr("transform", `translate(${width / 2},${width / 2})`);
const path = g
.append("g")
.selectAll("path")
.data(root.descendants().slice(1))
.join("path")
.attr("fill", d => {
while (d.depth > 1) d = d.parent;
return color(d.data.name);
})
.attr("fill-opacity", d =>
arcVisible(d.current) ? (d.children ? 0.6 : 0.4) : 0
)
.attr("d", d => arc(d.current));
path
.filter(d => d.children)
.style("cursor", "pointer")
.on("click", clicked);
path.append("title").text(d => `${getHierarchyPath(d)}\n${format(d.value)}`);
const label = g
.append("g")
.attr("pointer-events", "none")
.attr("text-anchor", "middle")
.style("user-select", "none")
.selectAll("text")
.data(root.descendants().slice(1))
.join("text")
.attr("dy", "0.35em")
.attr("fill-opacity", d => +labelVisible(d.current))
.attr("transform", d => labelTransform(d.current))
.text(d => d.data.name);
const goBackLabel = g
.append("text")
.text(getHierarchyPath(root))
.attr("text-anchor", "middle")
.attr("dominant-baseline", "middle")
.attr("transform", "scale(3)");
const parent = g
.append("circle")
.datum(root)
.attr("r", radius)
.attr("fill", "none")
.style("cursor", "pointer")
.attr("pointer-events", "all")
.on("click", clicked);
function clicked(event, p) {
parent.datum(p.parent || root);
const t = g.transition().duration(mutable mutableAnimationDuration);
goBackLabel.transition(t).text(getHierarchyPath(p));
root.each(
d =>
(d.target = {
x0:
Math.max(0, Math.min(1, (d.x0 - p.x0) / (p.x1 - p.x0))) *
2 *
Math.PI,
x1:
Math.max(0, Math.min(1, (d.x1 - p.x0) / (p.x1 - p.x0))) *
2 *
Math.PI,
y0: Math.max(0, d.y0 - p.depth),
y1: Math.max(0, d.y1 - p.depth)
})
);
// Transition the data on all arcs, even the ones that aren’t visible,
// so that if this transition is interrupted, entering arcs will start
// the next transition from the desired position.
path
.transition(t)
.tween("data", d => {
const i = d3.interpolate(d.current, d.target);
return t => (d.current = i(t));
})
.filter(function(d) {
return +this.getAttribute("fill-opacity") || arcVisible(d.target);
})
.attr("fill-opacity", d =>
arcVisible(d.target) ? (d.children ? 0.6 : 0.4) : 0
)
.attrTween("d", d => () => arc(d.current));
label
.filter(function(d) {
return +this.getAttribute("fill-opacity") || labelVisible(d.target);
})
.transition(t)
.attr("fill-opacity", d => +labelVisible(d.target))
.attrTween("transform", d => () => labelTransform(d.current));
}
function arcVisible(d) {
return d.y1 <= yMax && d.y0 >= 1 && d.x1 > d.x0;
}
function labelVisible(d) {
return d.y1 <= yMax && d.y0 >= 1 && (d.y1 - d.y0) * (d.x1 - d.x0) > 0.03;
}
function labelTransform(d) {
const x = (((d.x0 + d.x1) / 2) * 180) / Math.PI;
const y = ((d.y0 + d.y1) / 2) * radius;
return `rotate(${x - 90}) translate(${y},0) rotate(${x < 180 ? 0 : 180})`;
}
return svg.node();
}