Andrew Kingdom akingdom

## maths.md

      
              1 file
            
          
              0 forks
            
          
              0 comments
            
          
              0 stars
            
          
                akingdom
                / maths.md
            
            
              Last active
              April 7, 2024 02:27
            
              
                A few maths (re)discoveries I've made
              
          
    Some maths[^a] things I've found over the years.

By Andrew Kingdom.
(I'll update the details when I have time.)
Four-colour theorum formula

The four-colour theory states that any map can be coloured in using a maximum of four colours without using the same colour for neighbouring regions. This has been proven using a computer.
My discovery was a partial-geometric method (collapsing all combinations down to a single set of incomplete-shapes) to prove all combinations on paper, which I believe hadn't been done previously. This can also be done using a divided 2D toroidal (donut) shape series, but I'm not 100% sure it covers all possibilies.

  
## macos-kill-process.md

      
              1 file
            
          
              0 forks
            
          
              0 comments
            
          
              0 stars
            
          
                akingdom
                / macos-kill-process.md
            
            
              Last active
              March 11, 2024 21:49
            
              
                Killing processes on MacOS
              
          
    In MacOS here are two ways to kill processes in one hit. I'll use Google Drive as an example.
List process IDs (optional, useful to query beforehand or verify afterwards):
ps aux | grep "Google Drive" | awk '{print $2}'

Kill:
ps aux | grep "Google Drive" | awk '{print $2}' | xargs kill -9


## stereograph-swapLR,flipL.html
<!DOCTYPE html>
<html lang="en">
<!--
 HTML/JavaScript

 Intent: Swap cross-eye-stereograph image halves, optionally flipping one half horizontally.
 This is useful for incorrectly created stereo images.

 By Andrew Kingdom
 CC-BY license

## Useful Xcode debugger commands.md

      
              1 file
            
          
              0 forks
            
          
              0 comments
            
          
              0 stars
            
          
                akingdom
                / Useful Xcode debugger commands.md
            
            
              Last active
              December 17, 2023 11:47
            
              
                Useful Xcode debugger commands
              
          
    Useful Xcode debugger commands


Command
Description
Example


Value Inspection


po 
Print the value of an expression
po myVariable.count


po [object description]
Print a detailed description of the object.
po [myView debugDescription]


ptype 
Print the type of an expression
ptype myArray


quick look
Display a visual preview of an object in the debug pane


kvc path: "<key path>"
Access nested properties using Key-Value Coding from the current context
kvc path: "user.profile.name"


## Source Control in a nutshell.md

      
              1 file
            
          
              0 forks
            
          
              0 comments
            
          
              1 star
            
          
                akingdom
                / Source Control in a nutshell.md
            
            
              Last active
              December 17, 2023 10:21
            
          
    Source Control - what is it


Term
Definition


Source
A written recipe (programming code) and ingredients (data resources) from which an app is built.


Version Source Control
A way to keep track of all the changes you make and easily go back to any previous version if you make a mistake.


Git
A version source control system that distributes a full copy to each developer. Originally created to manage the Linux project.


GitHub
One commercial provider of a Git service. Backed by Microsoft.


Repository
Storage for all the different versions of your project's files.


## PLY file format + notes.md

      
              1 file
            
          
              0 forks
            
          
              0 comments
            
          
              0 stars
            
          
                akingdom
                / PLY file format + notes.md
            
            
              Last active
              September 29, 2023 12:09
            
          
    The PLY Polygon File Format


Main Article (Author: Greg Turk)


Clarifications (Author: Andrew Kingdom)


## ReadLine.swift
// Swift
//
// Intent: Read a single line string from a file, with some memory efficiency.
// This could be improved by use of an (unsafe) memory buffer
//
// By Andrew Kingdom
// MIT license
//
class ReadLineTool {

## ReadDataLines.swift
// Swift
//
// Intent: Process a simple memory-resident ASCII-style string in UTF8 format.
//
// Reads Data as a string, line by line,
// similar to how FileHandle works with a file pointer index.
// There are better ways to do this.
//
// By Andrew Kingdom
// MIT license

## concertina-collapsible.js
  // Implements clickable headings with collapsible content.
  // This doesn't currently recalculate height if content changes as I don't need that.
  //
  // Copyright (C) Andrew Kingdom 2023. all rights reserved.
  //
  // Heading elements must include class 'heading'.
  // Content elements must include class 'collapsibleContent' and be the node sibling immediately after the Headiing.
  //
  //
  // If HTML is in a separate file,

## ColorExtensions.cs
// C#
// Color from a web-style hex string
//
// By Andrew Kingdom
// MIT license
//
using System;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
	<!DOCTYPE html>
	<html lang="en">
	<!--
	HTML/JavaScript

	Intent: Swap cross-eye-stereograph image halves, optionally flipping one half horizontally.
	This is useful for incorrectly created stereo images.

	By Andrew Kingdom
	CC-BY license
Command	Description	Example
Value Inspection
`po`	Print the value of an expression	`po myVariable.count`
`po [object description]`	Print a detailed description of the object.	`po [myView debugDescription]`
`ptype`	Print the type of an expression	`ptype myArray`
`quick look`	Display a visual preview of an object in the debug pane
`kvc path: "<key path>"`	Access nested properties using Key-Value Coding from the current context	`kvc path: "user.profile.name"`
Term	Definition
Source	A written recipe (programming code) and ingredients (data resources) from which an app is built.
Version Source Control	A way to keep track of all the changes you make and easily go back to any previous version if you make a mistake.
Git	A version source control system that distributes a full copy to each developer. Originally created to manage the Linux project.
GitHub	One commercial provider of a Git service. Backed by Microsoft.
Repository	Storage for all the different versions of your project's files.
	// Swift
	//
	// Intent: Read a single line string from a file, with some memory efficiency.
	// This could be improved by use of an (unsafe) memory buffer
	//
	// By Andrew Kingdom
	// MIT license
	//
	class ReadLineTool {
	// Swift
	//
	// Intent: Process a simple memory-resident ASCII-style string in UTF8 format.
	//
	// Reads Data as a string, line by line,
	// similar to how FileHandle works with a file pointer index.
	// There are better ways to do this.
	//
	// By Andrew Kingdom
	// MIT license
	// Implements clickable headings with collapsible content.
	// This doesn't currently recalculate height if content changes as I don't need that.
	//
	// Copyright (C) Andrew Kingdom 2023. all rights reserved.
	//
	// Heading elements must include class 'heading'.
	// Content elements must include class 'collapsibleContent' and be the node sibling immediately after the Headiing.
	//
	//
	// If HTML is in a separate file,
	// C#
	// Color from a web-style hex string
	//
	// By Andrew Kingdom
	// MIT license
	//
	using System;
	using System.Collections.Generic;
	using System.Linq;
	using UnityEngine;