chart = {
const root = d3.hierarchy(data);
const links = root.links();
const nodes = root.descendants();
const simulation = d3.forceSimulation(nodes)
.force("link", d3.forceLink(links).id(d => d.id).distance(200).strength(2))
// .force("center", d3.forceCenter())
.force("charge", d3.forceManyBody().strength(-180))
// .force("x", d3.forceX())
// .force("y", d3.forceY());
const svg = d3.create("svg")
.attr("viewBox", [-width / 2, -height / 2, width, height]);
const link = svg.append("g")
.attr("stroke", "#999")
.attr("stroke-width", 3)
.attr("stroke-opacity", 0.6)
.selectAll("line")
.data(links)
.join("line");
const node = svg.append("g")
.attr("fill", "green")
.attr("stroke", "#000")
.attr("stroke-width", 1.5)
.selectAll("circle")
.data(nodes)
.join("circle")
.attr("fill", d => d.children ? null : "#fff")
.attr("stroke", d => d.children ? null : "#00")
.attr('r', d => 2.75 - d.depth + 'em')
// .attr("r", 8)
.call(drag(simulation));
const label = svg.append("g")
.selectAll("text")
.data(nodes)
.enter()
.append("text")
.style("fill", "black")
// .style("font", "10px times")
.attr("dx", 10)
.attr("dy", 10)
.attr('font-size', d => 3.4 - d.depth + 'em')
.text(function (d) {
return d.data.name;
});
node.append("title")
.text(d => d.data.name);
simulation.on("tick", () => {
link
.attr("x1", d => d.source.x)
.attr("y1", d => d.source.y)
.attr("x2", d => d.target.x)
.attr("y2", d => d.target.y);
node
.attr("cx", d => d.x)
.attr("cy", d => d.y);
label
.attr("x", d => d.x)
.attr("y", d => d.y);
});
invalidation.then(() => simulation.stop());
return svg.node();
}
data = FileAttachment("treedata.json").json()
height = 1500
drag = simulation => {
function dragstarted(event, d) {
if (!event.active) simulation.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
}
function dragged(event, d) {
d.fx = event.x;
d.fy = event.y;
}
function dragended(event, d) {
if (!event.active) simulation.alphaTarget(0);
d.fx = null;
d.fy = null;
}
return d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended);
}
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.
