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