mirror of
https://github.com/lynchmarkHQ/lynchmark.com.git
synced 2026-10-15 08:37:53 +00:00
25 lines
860 B
JavaScript
25 lines
860 B
JavaScript
export async function createStreamVisualizer(
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asyncIterable,
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{ maxPoints = Infinity, alpha = 0.5, width = 800, height = 400, yDomain = [0, 100] } = {}
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) {
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const { scaleLinear, line } = await import('d3');
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const data = [];
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let ema;
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for await (const { timestamp, value } of asyncIterable) {
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ema = ema === undefined ? 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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}
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if (!data.length) return { data, path: '' };
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const x = scaleLinear().domain([data[0].timestamp, data.at(-1).timestamp]).range([0, width]);
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const y = scaleLinear().domain(yDomain).range([height, 0]);
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const path = line().x(d => x(d.timestamp)).y(d => y(d.ema))(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: 11.140s
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// Result: FAIL
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