mirror of
https://github.com/node-red/node-red-nodes.git
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76 lines
3.0 KiB
JavaScript
76 lines
3.0 KiB
JavaScript
/**
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* Copyright 2014,2016 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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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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var node = this;
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var a = [];
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var tot = 0;
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var tot2 = 0;
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var pop = 0;
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var old = null;
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this.on('input', function (msg) {
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if (msg.hasOwnProperty("payload")) {
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var n = Number(msg.payload);
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if (!isNaN(n)) {
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if ((node.action === "low") || (node.action === "high")) {
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if (old == null) { old = n; }
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old = old + (n - old) / node.count;
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if (node.action === "low") { msg.payload = old; }
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else { msg.payload = n - old; }
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}
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else {
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a.push(n);
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if (a.length > node.count) { pop = a.shift(); }
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if (node.action === "max") {
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msg.payload = Math.max.apply(Math, a);
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}
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if (node.action === "min") {
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msg.payload = Math.min.apply(Math, a);
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}
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if (node.action === "mean") {
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tot = tot + n - pop;
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msg.payload = tot / a.length;
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}
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if (node.action === "sd") {
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tot = tot + n - pop;
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tot2 = tot2 + (n*n) - (pop * pop);
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if (a.length > 1) {
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msg.payload = Math.sqrt((a.length * tot2 - tot * tot)/(a.length * (a.length - 1)));
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}
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else { msg.payload = 0; }
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}
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}
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if (node.round !== false) {
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msg.payload = Math.round(msg.payload * Math.pow(10, node.round)) / Math.pow(10, node.round);
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}
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node.send(msg);
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}
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else { node.log("Not a number: "+msg.payload); }
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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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