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Adds customizable randomness factor to sine wave generator. Fixes #2726

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This commit is contained in:
Andrew Henry
2020-03-05 08:29:45 -08:00
parent 47c388450f
commit a1b1fa464e
3 changed files with 26 additions and 11 deletions
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19
example/generator/generatorWorker.js
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@ -65,8 +65,8 @@
name: data.name,
utc: nextStep,
yesterday: nextStep - 60*60*24*1000,
sin: sin(nextStep, data.period, data.amplitude, data.offset, data.phase),
cos: cos(nextStep, data.period, data.amplitude, data.offset, data.phase)
sin: sin(nextStep, data.period, data.amplitude, data.offset, data.phase, data.randomness),
cos: cos(nextStep, data.period, data.amplitude, data.offset, data.phase, data.randomness)
}
});
nextStep += step;
@ -99,19 +99,20 @@
var offset = request.offset;
var dataRateInHz = request.dataRateInHz;
var phase = request.phase;
var randomness = request.randomness;
var step = 1000 / dataRateInHz;
var nextStep = start - (start % step) + step;
var data = [];
for (; nextStep < end && data.length < 5000; nextStep += step) {
for (; nextStep < end && data.length < 50000; nextStep += step) {
data.push({
name: request.name,
utc: nextStep,
yesterday: nextStep - 60*60*24*1000,
sin: sin(nextStep, period, amplitude, offset, phase),
cos: cos(nextStep, period, amplitude, offset, phase)
sin: sin(nextStep, period, amplitude, offset, phase, randomness),
cos: cos(nextStep, period, amplitude, offset, phase, randomness)
});
}
self.postMessage({
@ -120,14 +121,14 @@
});
}
function cos(timestamp, period, amplitude, offset, phase) {
function cos(timestamp, period, amplitude, offset, phase, randomness) {
return amplitude *
Math.cos(phase + (timestamp / period / 1000 * Math.PI * 2)) + offset;
Math.cos(phase + (timestamp / period / 1000 * Math.PI * 2)) + (amplitude * Math.random() * randomness) + offset;
}
function sin(timestamp, period, amplitude, offset, phase) {
function sin(timestamp, period, amplitude, offset, phase, randomness) {
return amplitude *
Math.sin(phase + (timestamp / period / 1000 * Math.PI * 2)) + offset;
Math.sin(phase + (timestamp / period / 1000 * Math.PI * 2)) + (amplitude * Math.random() * randomness) + offset;
}
function sendError(error, message) {