mirror of
https://github.com/multipleof4/lynchmark.git
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21 lines
809 B
JavaScript
21 lines
809 B
JavaScript
async function createStreamVisualizer(src, { maxPoints, alpha, width, height, yDomain }) {
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const d3 = await import('https://cdn.jsdelivr.net/npm/d3@7/+esm');
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const data = [];
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let ema;
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for await (const { timestamp, value } of src) {
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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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const x = d3.scaleLinear()
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.domain(data.length ? [data[0].timestamp, data[data.length - 1].timestamp] : [0, 1])
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.range([0, width]);
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const y = d3.scaleLinear().domain(yDomain).range([height, 0]);
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const path = d3.line()
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.x(d => x(d.timestamp))
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.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: 6.412s
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// Result: PASS
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