mirror of
https://github.com/multipleof4/lynchmark.git
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24 lines
1005 B
JavaScript
24 lines
1005 B
JavaScript
async function createStreamVisualizer(asyncIterable, { maxPoints, alpha, width, height, yDomain }) {
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const data = [];
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let prevEma;
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let firstTs;
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let lastTs;
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for await (const { timestamp, value } of asyncIterable) {
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prevEma = prevEma === undefined ? value : alpha * value + (1 - alpha) * prevEma;
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const point = { timestamp, value, ema: prevEma };
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data.push(point);
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if (data.length > maxPoints) data.shift();
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lastTs = timestamp;
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if (!firstTs) firstTs = timestamp;
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}
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if (!data.length) return { data: [], path: '' };
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const d3 = await import('https://cdn.jsdelivr.net/npm/d3@7/+esm');
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const xScale = d3.scaleLinear().domain([firstTs, lastTs]).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)).curve(d3.curveMonotoneX);
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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: 51.428s
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// Result: FAIL
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