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smaEnvelope.src.js
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smaEnvelope.src.js
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var smaLabel;
function getBufferSize (periods) {
return periods;
}
function onStart (periods, envelope) {
if (typeof periods !== "number") {
error("SMA Envelope periods must be a number");
}
if (periods % 1 !== 0) {
error("SMA Envelope periods must be an integer");
}
if (periods > 100) {
error("SMA Envelope maximum period is 100");
}
if (periods <= 0) {
error("SMA Envelope periods must be greater than 0");
}
if (typeof envelope !== "number") {
error("SMA Envelope envelope must be a number");
}
if (envelope <= 0) {
error("SMA Envelope envelope percent must be greater than zero");
}
if (envelope > 100) {
error("SMA Envelope envelope percent must be below 100");
}
}
function onStart (periods, envelope) {
smaLabel = "sma(" + periods + ")";
}
function onIntervalClose (periods, envelope) {
var sma = Math.average(prices(periods)),
envelope = sma * (envelope / 100);
return [
sma - envelope,
sma + envelope,
{name: smaLabel, dashStyle: "Dash", value: sma}
];
}