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23 lines
832 B
JavaScript
23 lines
832 B
JavaScript
async function createStreamVisualizer(iterable, {
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maxPoints = 100,
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alpha = .5,
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width = 300,
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height = 150,
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yDomain = [0, 1]
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} = {}) {
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const { scaleLinear, line } = 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 point of iterable) {
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const { timestamp, value } = point
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ema = ema == null ? value : alpha * value + (1 - alpha) * ema
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data.push({ timestamp, value, ema })
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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; |