mirror of
https://github.com/multipleof4/lynchmark.git
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21 lines
794 B
JavaScript
21 lines
794 B
JavaScript
async function createStreamVisualizer(asyncIterable, { maxPoints, alpha, width, height, yDomain }) {
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const d3 = await import('d3'), data = [];
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let pe;
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for await (const { timestamp: t, value: v } of asyncIterable) {
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const ema = pe === undefined ? v : alpha * v + (1 - alpha) * pe;
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pe = ema;
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data.push({ timestamp: t, value: v, ema });
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data.length > maxPoints && data.shift();
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}
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if (!data.length) return { data: [], path: '' };
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const x = d3.scaleLinear().domain([data[0].timestamp, data.at(-1).timestamp]).range([0, width]);
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const y = d3.scaleLinear().domain(yDomain).range([height, 0]);
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return { data, path: d3.line().x(d => x(d.timestamp)).y(d => y(d.ema))(data) };
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}
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export default createStreamVisualizer;
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// Generation time: 81.116s
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// Result: FAIL
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