57 lines
1.4 KiB
JavaScript
57 lines
1.4 KiB
JavaScript
'use strict'
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/*
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Open Rowing Monitor, https://github.com/laberning/openrowingmonitor
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This Averager can calculate the moving average of a continuous flow of data points
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Please note: The array contains flankLength + 1 measured currentDt's, thus flankLength number
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of flanks between them.
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They are arranged that dataPoints[0] is the youngest, and dataPoints[flankLength] the oldest
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*/
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function createMovingAverager (length, initValue) {
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let dataPoints
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reset()
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function pushValue (dataPoint) {
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// add the new dataPoint to the array, we have to move data points starting at the oldest ones
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let i = length - 1
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while (i > 0) {
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// older data points are moved towards the higher numbers
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dataPoints[i] = dataPoints[i - 1]
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i = i - 1
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}
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dataPoints[0] = dataPoint
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}
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function replaceLastPushedValue (dataPoint) {
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// replace the newest dataPoint in the array, as it was faulty
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dataPoints[0] = dataPoint
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}
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function getAverage () {
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let i = length - 1
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let arrayTotal = 0.0
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while (i >= 0) {
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// summarize the value of the moving average
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arrayTotal = arrayTotal + dataPoints[i]
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i = i - 1
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}
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const arrayAverage = arrayTotal / length
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return arrayAverage
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}
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function reset () {
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dataPoints = new Array(length)
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dataPoints.fill(initValue)
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}
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return {
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pushValue,
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replaceLastPushedValue,
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getAverage,
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reset
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}
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}
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export { createMovingAverager }
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