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17 lines
709 B
JavaScript
17 lines
709 B
JavaScript
async function createStreamVisualizer(iter,opts={}){
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const{maxPoints:mp=1e3,alpha:a=.1,width:w=800,height:h=400,yDomain:yd=[0,1]}=opts;
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let data=[],pE=null;
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for await(const{timestamp:t,value:v}of iter){
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let ema=pE===null?v:a*v+(1-a)*pE;
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pE=ema;
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data.push({timestamp:t,value:v,ema});
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if(data.length>mp)data.shift();
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}
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if(!data.length)return{data,path:null};
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const d3=await import('https://cdn.skypack.dev/d3');
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const x=d3.scaleLinear().domain([data[0].timestamp,data.at(-1).timestamp]).range([0,w]);
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const y=d3.scaleLinear().domain(yd).range([h,0]);
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const ln=d3.line().x(d=>x(d.timestamp)).y(d=>y(d.ema));
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return{data,path:ln(data)};
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}
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export default createStreamVisualizer; |