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@ajmas
ajmas / SI Order of Magnitude.js
Last active Dec 3, 2015
Javascript code to an SI 'order of magnitude' prefix to a displayed value. For example, given 1000 and 'Hz', you will get 1kHz. For decimal number less than 1, big.js is needed to avoid errors. Note, I looked at using a mathematical approach to get the index, but it worked out to be about the same speed, so I opted for readability
View SI Order of Magnitude.js
//ref: https://en.wikipedia.org/wiki/Metric_prefix
function valueToMagnitude(value, unit, fixedPlaces) {
var unitExponents = [
[0,''],
[3,'k'],
[6,'M'],
[9,'G'],
[12,'T'],
[15,'P'],
@ajmas
ajmas / snapSVG rainbow gradient.js
Created Dec 24, 2015
Drawing a rainbow gradient with snapSVG
View snapSVG rainbow gradient.js
snap = Snap('#mySVG');
gradient = snap.gradient('l(0, 0, 1, 0)red-orange-yellow-green-blue-indigo-violet');
snap.rect(0,0,200,200).attr({
fill: gradient
});
@ajmas
ajmas / healthcheck.sh
Last active Jan 6, 2016
Script to do both IPv4 and IPv6 host health checks, also supporting hosts that only have one address class
View healthcheck.sh
#!/bin/ksh
hostname="$1"
url_protocol="https://"
url_path="/cbace7c0fbe7ffad8af83f61a550dcef/xxxxx_nvwwcsKpsN1qajmbto1_500.jpg"
## TODO support CNAMES properly - it throws things off
###
### IPv4 Health Check
@ajmas
ajmas / polar2cartesian.java
Last active Jan 20, 2016
Takes a panoramic image that is in a 'fisheye' view and unwraps it. See http://terra-azure.org/?loc=articles/programming/java/polar2cartesian for an explanation
View polar2cartesian.java
package ajmas74.experimental.graphics2d;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferInt;
import java.awt.image.DirectColorModel;
import java.awt.image.PixelGrabber;
import java.awt.image.Raster;
@ajmas
ajmas / IPv6Utils.js
Last active Mar 30, 2016
Some IPv6 utility functions I put together, improvements appreciated
View IPv6Utils.js
var ipv4Regex = /^(\d+)\.(\d+)\.(\d+)\.(\d+)$/;
function expandIPv6(ipv6ColonNotation) {
var pad = "0000"
var count = (ipv6ColonNotation.match(/:/g)|| []).length;
if (count == 0 || count > 7) {
// too few or too many colons
return "err";
}
@ajmas
ajmas / CoordinateParser.js
Last active Mar 31, 2016
Parsing text and producing a geo coordinate
View CoordinateParser.js
CoordinateParser = {
convertDegMinSecToDecDeg: function (deg, min, sec, direction) {
var value;
if (min === undefined) { min = 0; }
if (sec === undefined) { sec = 0; }
deg = parseFloat(deg);
min = parseFloat(min);
View countryNameForCoord.js
// depends on turf and having a copy of the countries.gejson file for the value of the countryOutlines
// see: https://github.com/johan/world.geo.json as one source
findCountryName (latlon) {
var features, i, j, poly;
var point1 = turf.point([latlon[1], latlon[0]]);
if (this.countryOutlines) {
features = this.countryOutlines.features;
for (i=0; i<features.length; i++) {
@ajmas
ajmas / download-from-google-drive.js
Last active Jan 4, 2017
Downloads a directory structure from Google Drive. Also handles exporting of the Google Docs.
View download-from-google-drive.js
const fs = require('fs-extra');
const google = require('googleapis');
const OAuth2 = google.auth.OAuth2;
const key = require('./key.json');
var baseFolder = 'base';
function downloadFile(file, path) {
setTimeout(function () {
var filePath = path.concat(file.name).join('/');
View web-sensor-proxy.js
/**
* Creates an HTTP server to allow to read the sensor data via
* HTTP. Improvements could include caching the data, to avoid
* the sensor being hit too frequently.
*
* Not tested in-situ.
*/
const express = require('express');
const app = express();
const net = require('net');
@ajmas
ajmas / confgurable-password-checker.js
Last active Feb 2, 2017
Configurable Password Checker
View confgurable-password-checker.js
// This version work on simply checking something that fails a rule, though
// it may be useful to check based on estimated password strength. For this
// each function would return a value indicating strength. This value could
// be positive or negative. For example, a string longer than 16 characters
// could get a rating of +5, but being digit only get a -5. Other methods
// could simply return 0/+1.
var ruleFunctions = {
duplicateChars: function(password, min) {
var prevChar, i;
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