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30 lines
1014 B
JavaScript
30 lines
1014 B
JavaScript
export async function createStreamVisualizer(asyncIterable, options) {
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const {maxPoints, alpha, width, height, yDomain} = options;
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const d3 = await import('https://cdn.jsdelivr.net/npm/d3@7/+esm');
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let data = [];
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let prevEma = null;
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for await (const v of asyncIterable) {
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const ts = v.timestamp || Date.now();
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const val = v.value;
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if (prevEma === null) prevEma = val;
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const ema = alpha * val + (1 - alpha) * prevEma;
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prevEma = ema;
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data.push({timestamp: ts, value: val, 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 = d3.scaleLinear()
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.domain([data[0].timestamp, data[data.length - 1].timestamp])
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.range([0, width]);
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const y = d3.scaleLinear()
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.domain(yDomain)
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.range([height, 0]);
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const line = d3.line()
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.x(d => x(d.timestamp))
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.y(d => y(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: 1.550s
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// Result: PASS
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