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index.html
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index.html
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<head>
<style>
body { margin: 0; }
</style>
<script src="//unpkg.com/horizon-timeseries-chart"></script>
<!--<script src="../../dist/horizon-timeseries-chart.js"></script>-->
</head>
<body>
<div id="horizon-chart"></div>
<script>
const N_POINTS = Math.round(window.innerWidth / 2);
const N_SERIES = 3;
const TIME_STEP = 1000;
const chart = HorizonTSChart()(document.getElementById('horizon-chart'))
.series('series')
.yNormalize(true)
.interpolationCurve(false);
let { data, seriesLastPnt } = genZeroData(N_SERIES, N_POINTS);
(function onFrame() {
data = pushNewPoint(data, seriesLastPnt);
chart.data(data);
requestAnimationFrame(onFrame);
})(); // IFFE
//
function genZeroData(nSeries = 10, nPoints = 100, timeStep = TIME_STEP, endTime = new Date()) {
const startTime = +endTime - nPoints * timeStep;
const seriesPnt = {};
[...new Array(nSeries)].forEach((_, i) => seriesPnt[`series${i}`] = {
ts: startTime,
val: 0
});
let data = [];
[...new Array(nPoints)].forEach(() =>
Object.keys(seriesPnt).forEach(series => {
seriesPnt[series].ts += TIME_STEP;
data.push({ series, ...seriesPnt[series] })
})
);
return { data, seriesLastPnt: seriesPnt };
}
function pushNewPoint(data, seriesLastPnt, timeStep) {
const numSeries = Object.keys(seriesLastPnt).length;
data = data.slice(numSeries) // remove oldest point
.concat(Object.entries(genNewSeriesTimePoint(seriesLastPnt, timeStep))
.map(([series, d]) => ({ series, ...d })));
return data;
function genNewSeriesTimePoint(prevSeriesVals, timeStep = TIME_STEP) {
Object.keys(prevSeriesVals).forEach(series => prevSeriesVals[series] = genTimePoint(prevSeriesVals[series], timeStep));
return prevSeriesVals;
function genTimePoint({ ts: prevTs, val: prevVal }, timeStep) {
return {
ts: prevTs + timeStep,
val: prevVal += (Math.random() - 0.5)
}
}
}
}
</script>
</body>