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