const NODE_PADDING = 10; const LINE_HEIGHT = 14; const canvas = new OffscreenCanvas(0, 0); const ctx = canvas.getContext("2d"); ctx.font = `${LINE_HEIGHT}px sans-serif`; onmessage = (e) => { const { graph, additions } = e.data; const g = new dagre.graphlib.Graph({ compound: true }); g.setGraph({ rankdir: "LR" }).setDefaultEdgeLabel(function() { return {}; }); if (additions.length !== 0) g.setNode("addition", {label:"", style:"fill: rgba(26, 27, 38, 0.5); stroke: none;", padding:0}); for (const [k, {label, src, color}] of Object.entries(graph)) { // adjust node dims by label size + add padding let [width, height] = [0, 0]; for (line of label.split("\n")) { width = Math.max(width, ctx.measureText(line).width); height += LINE_HEIGHT; } g.setNode(k, {label, color, width:width+NODE_PADDING*2, height:height+NODE_PADDING*2, padding:NODE_PADDING}); const edgeCounts = {} for (const s of src) edgeCounts[s] = (edgeCounts[s] || 0)+1; for (const s of src) g.setEdge(s, k, { label: edgeCounts[s] > 1 ? edgeCounts[s] : null }); if (additions.includes(parseInt(k))) g.setParent(k, "addition"); } dagre.layout(g); postMessage(dagre.graphlib.json.write(g)); self.close(); }