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 = d3.json("https://gist.githubusercontent.com/priscylla/a80d0b7f1c6ebe490f80b156363bbae4/raw/f13b66fd32df124713e027b045f69d3df83bed5e/researchtopics.json")
height = 200
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")
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.
