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node-red-nodes/function/smooth/17-smooth.js

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module.exports = function(RED) {
"use strict";
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function SmoothNode(n) {
RED.nodes.createNode(this, n);
this.action = n.action;
this.round = n.round || false;
if (this.round == "true") { this.round = 0; }
this.count = Number(n.count);
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this.mult = n.mult || "single";
var node = this;
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var v = {};
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this.on('input', function (msg) {
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var top = msg.topic || "_my_default_topic";
if (this.mult === "single") { top = "a"; }
if ((v.hasOwnProperty(top) !== true) || msg.hasOwnProperty("reset")) {
v[top] = {};
v[top].a = [];
v[top].tot = 0;
v[top].tot2 = 0;
v[top].pop = 0;
v[top].old = null;
v[top].count = this.count;
}
if (msg.hasOwnProperty("payload")) {
var n = Number(msg.payload);
if (!isNaN(n)) {
if ((node.action === "low") || (node.action === "high")) {
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if (v[top].old == null) { v[top].old = n; }
v[top].old = v[top].old + (n - v[top].old) / v[top].count;
if (node.action === "low") { msg.payload = v[top].old; }
else { msg.payload = n - v[top].old; }
}
else {
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v[top].a.push(n);
if (v[top].a.length > v[top].count) { v[top].pop = v[top].a.shift(); }
if (node.action === "max") {
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msg.payload = Math.max.apply(Math, v[top].a);
}
if (node.action === "min") {
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msg.payload = Math.min.apply(Math, v[top].a);
}
if (node.action === "mean") {
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v[top].tot = v[top].tot + n - v[top].pop;
msg.payload = v[top].tot / v[top].a.length;
}
if (node.action === "sd") {
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v[top].tot = v[top].tot + n - v[top].pop;
v[top].tot2 = v[top].tot2 + (n*n) - (v[top].pop * v[top].pop);
if (v[top].a.length > 1) {
msg.payload = Math.sqrt((v[top].a.length * v[top].tot2 - v[top].tot * v[top].tot)/(v[top].a.length * (v[top].a.length - 1)));
}
else { msg.payload = 0; }
}
}
if (node.round !== false) {
msg.payload = Math.round(msg.payload * Math.pow(10, node.round)) / Math.pow(10, node.round);
}
node.send(msg);
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}
else { node.log("Not a number: "+msg.payload); }
} // ignore msg with no payload property.
});
}
RED.nodes.registerType("smooth", SmoothNode);
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}