mirror of
https://github.com/multipleof4/lynchmark.git
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24 lines
1000 B
JavaScript
24 lines
1000 B
JavaScript
const createStreamVisualizer = async (asyncIterable, options) => {
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const { maxPoints = 100, alpha = 0.1, width = 800, height = 400, yDomain = [0, 100] } = options;
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const data = [];
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let ema = null;
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let firstTimestamp = null;
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for await (const { timestamp, value } of asyncIterable) {
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ema = ema === null ? value : alpha * value + (1 - alpha) * ema;
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data.push({ timestamp, value, ema });
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if (data.length > maxPoints) data.shift();
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if (firstTimestamp === null) firstTimestamp = timestamp;
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}
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const d3 = await import('https://esm.sh/d3@7');
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const xScale = d3.scaleLinear().domain([firstTimestamp, data[data.length - 1].timestamp]).range([0, width]);
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const yScale = d3.scaleLinear().domain(yDomain).range([height, 0]);
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const line = d3.line().x(d => xScale(d.timestamp)).y(d => yScale(d.ema));
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const path = line(data);
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return { data, path };
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};
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export default createStreamVisualizer;
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// Generation time: 9.968s
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// Result: PASS
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