Disjoint Force-Directed Graph When using D3’s force layout with a disjoint graph, you typically want the positioning forces (d3.forceX and d3.forceY) instead of the centering force (d3.forceCenter). The positioning forces, unlike the centering force, prevent detached subgraphs from escaping the viewport.
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("x", d3.forceX()) .force("y", d3.forceY()); const svg = d3.select(DOM.svg(width, height)) .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); }); 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(); 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")