chart = {
const width = 928;
const root = d3.hierarchy(data);
const dx = 10;
const dy = width / (root.height + 1);
const tree = d3.cluster().nodeSize([dx, dy]);
root.sort((a, b) => d3.ascending(a.data.name, b.data.name));
tree(root);
let x0 = Infinity;
let x1 = -x0;
root.each(d => {
if (d.x > x1) x1 = d.x;
if (d.x < x0) x0 = d.x;
});
const height = x1 - x0 + dx * 2;
const svg = d3.create("svg")
.attr("width", width)
.attr("height", height)
.attr("viewBox", [-dy / 3, x0 - dx, width, height])
.attr("style", "max-width: 100%; height: auto; font: 10px sans-serif;");
const link = svg.append("g")
.attr("fill", "none")
.attr("stroke", "#555")
.attr("stroke-opacity", 0.4)
.attr("stroke-width", 1.5)
.selectAll()
.data(root.links())
.join("path")
.attr("d", d3.linkHorizontal()
.x(d => d.y)
.y(d => d.x));
const node = svg.append("g")
.attr("stroke-linejoin", "round")
.attr("stroke-width", 3)
.selectAll()
.data(root.descendants())
.join("g")
.attr("transform", d => `translate(${d.y},${d.x})`);
node.append("circle")
.attr("fill", d => d.children ? "#555" : "#999")
.attr("r", 2.5);
node.append("text")
.attr("dy", "0.31em")
.attr("x", d => d.children ? -6 : 6)
.attr("text-anchor", d => d.children ? "end" : "start")
.text(d => d.data.name)
.attr("stroke", "white")
.attr("paint-order", "stroke");
return svg.node();
}