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16 lines
699 B
JavaScript
16 lines
699 B
JavaScript
async function createStreamVisualizer(iter,opts){
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const{maxPoints:max,alpha,width,height,yDomain}=opts;
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let data=[],prev=null;
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for await(const i of iter){
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const ts=i.timestamp,v=i.value,e=prev==null?v:alpha*v+(1-alpha)*prev;
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prev=e;
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data.push({timestamp:ts,value:v,ema:e});
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if(data.length>max)data.shift();
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}
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const{scaleLinear,line}=await import('https://cdn.skypack.dev/d3');
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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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return{data,line().x(d=>x(d.timestamp)).y(d=>y(d.ema))(data)};
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}
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export default createStreamVisualizer; |