xem

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;

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:

xem

codegolf JS

Mini projects by Maxime Euzière (xem), subzey, Martin Kleppe (aemkei), Mathieu Henri (p01), Litterallylara, Tommy Hodgins (innovati), Veu(beke), Anders Kaare, Keith Clark, Addy Osmani, bburky, rlauck, cmoreau, maettig, thiemowmde, ilesinge, adlq, solinca, xen_the,...

(For more info and other projects, visit http://xem.github.io)

(Official Slack room: http://jsgolf.club / join us on http://register.jsgolf.club)

xem

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).

---

xem

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE

xem

• 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

xem

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE

xem

• 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)

xem

<!-- solution 1, 117b, inspired by http://www.p01.org/releases/140bytes_music_softSynth/ -->
<button onclick="new Audio('data:audio/wav;base64,UklGRl9vT19XQVZFZm10IBAAAAABAAEAQB8AAEAfAAABAAgAZGF0YU'+Array(1e3).join(123)).play()">Beep</button>

<!-- Solution 2, 107b, inspired by http://xem.github.io/chip8/c8.html -->
<button onclick="o=(A=new AudioContext()).createOscillator();o.connect(A.destination);o.start(0);setTimeout('o.stop(0)',500)">Boop</button>

xem

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE