math & informatics teacher
chart = {
const links = data.links.map((d) => Object.create(d));
const nodes = data.nodes.map((d) => Object.create(d));
const simulation = d3
.forceSimulation(nodes)
.force(
"link",
d3.forceLink(links).id((d) => d.id)
)
.force("charge", d3.forceManyBody())
.force("center", d3.forceCenter(width / 2, height / 2));
const svg = d3.create("svg").attr("viewBox", [0, 0, width, height]);
const link = svg
.append("g")
.attr("stroke", "#999")
.attr("stroke-opacity", 0.6)
.selectAll("line")
.data(links)
.join("line")
.attr("stroke-width", (d) => Math.sqrt(d.value));
const node = svg
.append("g")
.selectAll(".node")
.data(nodes)
.join("g")
.attr("class", "node")
.call(drag(simulation));
node.append("circle").attr("r", 5).attr("fill", color);
node
.append("text")
.text(function (d) {
return d.id;
})
.style("fill", "#000")
.style("font-size", "12px")
.attr("x", 6)
.attr("y", 3);
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("transform", (d) => `translate(${d.x}, ${d.y})`);
});
invalidation.then(() => simulation.stop());
return svg.node();
}
data = FileAttachment("rapper-graph-nodelink.json").json()
height = 600
color = {
const scale = d3.scaleOrdinal(d3.schemeCategory10);
return d => scale(d.group);
}
drag = simulation => {
function dragstarted(d) {
if (!d3.event.active) simulation.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
}
function dragged(d) {
d.fx = d3.event.x;
d.fy = d3.event.y;
}
function dragended(d) {
if (!d3.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@5")
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