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Save a Force-Directed Graph to localStorage
chart = {
const links = data.links.map(d => Object.create(d));
const nodes = data.nodes.map(d => Object.create(d));
// apply fixed positions found in localStorage
const fx = JSON.parse(localStorage.getItem("fixedNodes"));
if (fx && fx.length > 0)
for (const f of fx) {
const i = f.i,
fx = f.fx,
fy = f.fy;
if (i && nodes[i] && fx && fy) {
nodes[i].fx = fx;
nodes[i].fy = fy;
}
}
const simulation = d3
.forceSimulation(nodes)
.force("link", d3.forceLink(links).id(d => d.id))
.force("charge", d3.forceManyBody())
.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-opacity", 0.6)
.selectAll("line")
.data(links)
.join("line")
.attr("stroke-width", d => Math.sqrt(d.value));
const node = svg
.append("g")
.attr("stroke", "#fff")
.attr("stroke-width", 1.5)
.selectAll("circle")
.data(nodes)
.join("circle")
.attr("r", 5)
.attr("fill", color)
.call(drag(simulation));
node.append("title").text(d => d.id);
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)
.attr("stroke", d => (d.fx ? "#333" : "#fff"));
});
invalidation.then(() => simulation.stop());
return svg.node();
}
data = d3.json("https://gist.githubusercontent.com/mbostock/74cb803c013404ac30e63f020a52a2fd/raw/c7c74c939b602c56c80848963f9ad24802baaead/graph.json")
height = 680
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();
if (!d.fx) {
d.fx = d.x;
d.fy = d.y;
} else {
d.fx = d.fy = null;
}
}
function dragged(d) {
d.fx = d3.event.x;
d.fy = d3.event.y;
}
function dragended(d) {
if (!d3.event.active) simulation.alphaTarget(0);
// save fixed locations to localStorage
localStorage.setItem(
"fixedNodes",
JSON.stringify(
simulation
.nodes()
.map((d, i) => ({ i, fx: d.fx, fy: d.fy }))
.filter(d => d.fx)
)
);
}
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.
