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