xem

Keybase proof

I hereby claim:

I am xem on github.
I am xem06 (https://keybase.io/xem06) on keybase.
I have a public key ASC5fuxaRvyhB7W-5_bu00ejCWI-x-m3W1yEDXTR-j1m8go

To claim this, I am signing this object:

3D projection on a 2D canvas (wip blog post)

A very short article about a very specific topic: draw 3D points on a 2D canvas!
It's not very complex, but it puzzled me for years, until C4ntelope made this handy introduction based on his own intuition and computations, and Román Cortés helped me complete these explanations and simplify the maths and the code.
(This article is based on that Twitter thread).

3D Peach Castle (CSS3D vs. raycasting feat RomanCortes)
3D solar system (feat Yonatan)
Two3D clone (feat BalintCsala)
2D physics engine (feat BalintCsala)
Mandelbox (feat BalintCsala)
An app that generates QR codes containing 1kb demos
A 2D WFC tracer
random dweet generator
SMB 1-1
3D plotter

Don't modify strings (content: "...", font-family: '...')
Remove all CSS comments (ex: /* ... */ )
Remove all unnecessary spaces, tabs and line breaks (ex: around + > ~ ; : , ( ) { } /)
- Keep spaces before : in selectors (ex: * :before != *:before)
- Keep spaces around + and - in calc(...) (but not in nth-child and nth-of-type)
Remove all unnecessary ; (ex: a{color:red;})
Remove all unnecessary * in CSS selectors (ex: *:before => :before)
Remove leading and trailing zeros (ex: 0.1%, 1.0%, 0.0px)
Remove units after zero (ex: 0px 0rem 0% 0turn 0vmax 0dpi)

Conventions

A = [xA, yA] is a point on the 2D plane. Same for B, C, ...
lengths are in any unit (ex: pixels)
code snippets are in JavaScript

Degrees to radians

angleRad = angleDeg * Math.PI / 180;

	<body style=margin:0>
	<canvas id=a>
	<script>
	// initialize 2D canvas (c)
	// initialize game state (s)
	// initialize keys states (u,r,d,l for directions, k for all the keyboard)
	c=a.getContext`2d`,k=[u=r=d=l=s=0]

	// (initialize your global variables here)

	<pre id=p><script id="s" style="display:block">setInterval(z=`
	/* =<,m#F^ A W###q. */ ;
	/* #K q##H######Am */ ;
	/* dP cpq#q##########b, */ ;
	/* p##@###YG=[#######y */ ;
	/* d#qg 'PWo##q#######D / ;
	/* aem1k.com Q###KWR#### W[ */ ;
	/* .Q#########Md#.###OP A@ , */ ;
	/* , (W#####Xx######.P^ T % */ ;
	/* #y '^TqW####P###BP */ ;

	<body contenteditable oninput=eval(S.textContent)>
	<h1>Hi! (edit me)</h1>
	<script style="display:block;border:1px solid;;white-space:pre-wrap" id=S>
	// JS (edit me)
	console.log("test");
	</script>
	<style style="display:block;border:1px solid;white-space:pre-wrap">
	/* CSS (edit me) */
	* { background: #def }
	</style>

	<canvas id=a>
	<script>
	g=a.getContext("webgl");



	/*

	// Coral reef
	// -----------

	<?xml version="1.0"?>
	<bindings xmlns="http://www.mozilla.org/xbl" xmlns:html="http://www.w3.org/1999/xhtml">

	<binding id="mycode">
	<implementation>
	<constructor>
	alert("XBL script executed.");
	</constructor>
	</implementation>
	</binding>