mirror of
https://github.com/multipleof4/lynchmark.git
synced 2026-01-13 16:17:54 +00:00
48 lines
1.2 KiB
JavaScript
48 lines
1.2 KiB
JavaScript
async function createStreamVisualizer(asyncIterable, o = {}) {
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let {
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maxPoints = 500,
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alpha = 0.2,
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width = 600,
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height = 200,
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yDomain = [0, 1]
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} = o
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alpha = +alpha
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if (!(alpha >= 0 && alpha <= 1)) alpha = 0.2
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let d3 = await import("https://cdn.jsdelivr.net/npm/d3@7/+esm")
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let data = [], ema, seeded = false
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for await (let p of asyncIterable) {
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let timestamp, value
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if (Array.isArray(p)) [timestamp, value] = p
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else if (p && typeof p == "object") ({ timestamp, value } = p)
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else (timestamp = Date.now()), (value = p)
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timestamp = +timestamp
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value = +value
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if (!seeded) (ema = value), (seeded = true)
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else ema = alpha * value + (1 - alpha) * ema
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data.push({ timestamp, value, ema })
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if (data.length > maxPoints) data.splice(0, data.length - maxPoints)
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}
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let path = ""
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if (data.length) {
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let t0 = data[0].timestamp, t1 = data.at(-1).timestamp
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if (t0 === t1) t1 = t0 + 1
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let x = d3.scaleLinear().domain([t0, t1]).range([0, width])
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let y = d3.scaleLinear().domain(yDomain).range([height, 0])
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path = d3.line().x(d => x(d.timestamp)).y(d => y(d.ema))(data) || ""
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}
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return { data, path }
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}
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export default createStreamVisualizer;
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// Generation time: 18.105s
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// Result: PASS
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