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Add smoothing node to Node-RED-nodes

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Dave C-J 2014-09-20 09:26:09 +01:00
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<!--
Copyright 2014 IBM Corp.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<script type="text/x-red" data-template-name="smooth">
<div class="form-row">
<select id="node-input-action" style="width:80%; margin-right:5px;">
<option value="max">Return the maximum value seen</option>
<option value="min">Return the minimum value seen</option>
<option value="mean">Return the mean value seen</option>
<option value="low">Perform low pass filter</option>
<option value="high">Perform high pass filter</option>
</select>
</div>
<div class="form-row">
<span id="node-over">over the most recent </span>
<input type="text" id="node-input-count" placeholder="10" style="width:80px;"/>
<span id="node-over2"> values.</span>
</div>
<div class="form-row">
<label for="node-input-round" style="width:200px;">Round to nearest integer ?</label>
<input type="checkbox" id="node-input-round" style="display: inline-block; width: auto; vertical-align: top;">
</div>
<br/>
<div class="form-row">
<label for="node-input-name"><i class="icon-tag"></i> Name</label>
<input type="text" id="node-input-name" placeholder="Name">
</div>
<div class="form-tips" id="node-tip">Tip: This node ONLY works with numbers.</div>
</script>
<script type="text/x-red" data-help-name="smooth">
<p>A simple node to provide various functions across several previous values, including max, min, mean, high and low pass filters.</p>
<p>Max, Min and Mean work over a specified number of previous values.</p>
<p>The High and Low pass filters use a smoothing factor. The higher the number the more the smoothing. E.g. a value of 10 is similar to an &alpha; of 0.1. It is analagous to an RC time constant - but there is no time component to this as the time is based on events arriving.</p>
<p><b>Note:</b> This only operates on <b>numbers</b>. Anything else will try to be made into a number and rejected if that fails.</p>
</script>
<script type="text/javascript">
RED.nodes.registerType('smooth', {
color: "#E2D96E",
category: 'function',
defaults: {
count: {value:"10",required:true,validate:RED.validators.number()},
action: {value:"mean"},
round: {value:false},
name: {value:""}
},
inputs: 1,
outputs: 1,
icon: "smooth.png",
label: function() {
return this.name || "smooth";
},
labelStyle: function() {
return this.name ? "node_label_italic" : "";
},
oneditprepare: function() {
$("#node-input-count").spinner({
min:1,
width:80
});
$("#node-input-action").change( function() {
var a = $("#node-input-action").val();
if ((a === "high") || ( a === "low" )) {
$("#node-over").html("with a smoothing factor of ");
$("#node-over2").html("");
}
else {
$("#node-over").html("over the most recent ");
$("#node-over2").html(" values.");
}
});
$("#node-input-action").change();
}
});
</script>

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

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node-red-node-smooth
====================
A <a href="http://nodered.org" target="_new">Node-RED</a> node that provides several simple smoothing algorithms for incoming data values.
Install
-------
Run the following command in the root directory of your Node-RED install
npm install node-red-node-smooth
Usage
-----
A simple node to provide various functions across several previous values, including max, min, mean, high and low pass filters.
Max, Min and Mean work over a specified number of previous values.
The High and Low pass filters use a smoothing factor. The higher the number the more the smoothing. E.g. a value of 10 is similar to an &alpha; of 0.1. It is analogous to an RC time constant - but there is no time component to this as the code is based on events arriving.
**Note:** This only operates on **numbers**. Anything else will try to be made into a number and rejected if that fails.

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{
"name" : "node-red-node-smooth",
"version" : "0.0.1",
"description" : "A Node-RED node that provides several simple smoothing algorithms for incoming data values.",
"dependencies" : {
},
"repository" : {
"type":"git",
"url":"https://github.com/node-red/node-red-nodes/tree/master/analysis/smooth"
},
"license": "Apache",
"keywords": [ "node-red", "smooth", "average" ],
"node-red" : {
"nodes" : {
"smooth": "17-smooth.js"
}
},
"author": {
"name": "Dave Conway-Jones",
"email": "ceejay@vnet.ibm.com",
"url": "http://nodered.org"
}
}