r/matrix

by noromanba 2017-01-31 [2017/01/31 07:21:20]
(Forked from matrix by yuta25)

Neo's-eyes simulator

• /*
   * @title r/matrix
   * @description Neo's-eyes simulator
   * @include http://*
   * @include https://*
   * @contributor http://timelessname.com/sandbox/matrix_orig.html
   * @contributor http://timelessname.com/sandbox/matrix.html
   * @contributor jargonjustin  https://www.reddit.com/r/programming/comments/1ag0c3/
   * @contributor NonNonHeinous, OptionalField, echeese and maschnitz
   * @contributor yuta25        http://let.hatelabo.jp/yuta25/let/hJmeu-js5vps (Fork of)
   * @contributor a-kuma3       http://h.hatena.ne.jp/a-kuma3/315649928894883680
   * @license TBD (as-is); see the bottom
   * @javascript_url
   */
  
  // remember '00s web
  // Matrix digital rain c.f.
  // https://www.google.com/search?q=matrix+rain+javascript
  // https://en.wikipedia.org/wiki/Matrix_digital_rain
  //
  // perhaps parent code c.f.
  // http://timelessname.com/sandbox/matrix_orig.html
  // http://timelessname.com/sandbox/matrix.html
  //  https://www.reddit.com/r/programming/comments/1ag0c3/someone_posted_an_htmljavascript_implementation/
  //  https://news.ycombinator.com/item?id=5388444
  (() => {
    'use strict';
  
    const canvas = document.createElement('canvas');
    canvas.width = window.screen.width;
    canvas.height = document.body.scrollHeight;
  
    //canvas.style.height = `${document.body.scrollHeight}px`;
    canvas.style.position = 'absolute';
    canvas.style.top = canvas.style.left = '0';
    canvas.style.zIndex = Number.MAX_SAFE_INTEGER || Number.MAX_VALUE;
  
    document.body.appendChild(canvas);
  
    const ctx = canvas.getContext('2d');
    let degree = 0;
    let texts = Array(256).fill(1);
    setInterval(() => {
      ctx.fillStyle = 'rgba(0, 0, 0, 0.05)';
      ctx.fillRect(0, 0, canvas.width, canvas.height);
      ctx.fillStyle = 'rgba(0, 255, 0, 1)';
      // id:yuta25 code is Trapezoidal (~=Triangle) wave
      //
      // opacity range: 0-1
      // Unit Circle and Radian based cyclic waveform algorithm;
      // TBD  Pulse, Sawtooth, Square, Triangle, and Trapezoidal wave
      // https://en.wikipedia.org/wiki/Waveform
      const radian = degree * Math.PI / 180;
      // cos(x) + 0.5; pseudo Trapezoidal waveform, force canonical 0-1 by opacity
      // https://www.google.com/search?q=cos%28x%29%2B0.5
      //canvas.style.opacity = Math.cos(radian) + 0.5;
      /*/
      // cos(x)^2; Sine wave w/ abs, like a yuta25 code
      // https://www.google.com/search?q=abs%28cos%28x%29%29%5E2
      canvas.style.opacity = Math.pow(Math.abs(Math.cos(radian)), 2);
      /*/
      // (cos(x) + 1) / 2; slower Sine wave than abs-methods
      // https://www.google.com/search?q=%28%28cos%28x%29%2B1%29%2F2
      // thx id:a-kuma3
      // http://h.hatena.ne.jp/a-kuma3/315649928894883680
      canvas.style.opacity = ((Math.cos(radian)) + 1) / 2;
      //*/
      const OMEGA = 5;
      // modulo for avoid +Infinity
      degree = (degree % 360) + OMEGA;
  
      // TODO deobfuscate Magic Numbers; hints c.f.
      // https://news.ycombinator.com/item?id=5388575
      //  https://jsfiddle.net/tburette/w6npr/5/
      //  https://jsfiddle.net/muV99/1/
      //  https://news.ycombinator.com/item?id=5392479
      texts = texts.map((val, idx) => {
        const rand = Math.random();
        ctx.fillText(String.fromCharCode(Math.floor(2720 + rand * 33)), idx * 10, val);
        val += 10;
        return val > 768 + rand * 1e4 ? 0 : val;
      });
    }, 33);
  })();
  
  // # License/Fork Tree
  //
  // unknown origin
  //
  // ## timelessname.com
  // Unknown (as-is)
  //  first code?
  //  http://timelessname.com/sandbox/matrix_orig.html
  //  Last-Modified: Sun, 17 Mar 2013 05:14:57 GMT
  // Sun Mar 17 05:14:57 2013 UTC
  //
  // Unknown (as-is)
  //  http://timelessname.com/sandbox/matrix.html
  //  Last-Modified: Sun, 17 Mar 2013 05:59:49 GMT
  // Sun Mar 17 05:59:49 2013 UTC
  //
  // ## on Hacker News
  // Unknown (as-is)
  //  https://news.ycombinator.com/item?id=5388444
  //  post: 1414 days ago (no timestamp)
  // Sun Mar 17 07:37:02 2013 UTC
  //
  // ## on /r/programming
  //  https://www.reddit.com/r/programming/comments/1ag0c3/someone_posted_an_htmljavascript_implementation/
  //
  // ### posted by /u/jargonjustin
  // Unknown (as-is)
  //  https://www.reddit.com/r/programming/comments/1ag0c3/someone_posted_an_htmljavascript_implementation/c8x2fjx/
  //  datetime:
  // Sun Mar 17 03:29:36 2013 UTC
  //
  // ### merged by /u/NonNonHeinous
  // Unknown (as-is)
  // /u/jargonjustin, /u/OptionalField, /u/echeese, and /u/maschnitz (and/or more redditors?)
  //  https://www.reddit.com/r/programming/comments/1ag0c3/someone_posted_an_htmljavascript_implementation/c8x3vov/
  //
  // ## just a collect by MinhasKamal from merged code
  // Unknown (as-is)
  //  https://github.com/MinhasKamal/CreepyCodeCollection/blob/master/README.md
  //    https://github.com/MinhasKamal/CreepyCodeCollection/blob/master/matrix_effect.html
  //
  // ### pure js port and mod by yuta25
  // MIT License  https://opensource.org/licenses/MIT
  //  http://let.hatelabo.jp/yuta25/let/hJmeu-js5vps
  //
  // ### re-mod by noromanba the Genin translator
  // WTFPL (Do What the Fuck You Want to Public License)
  //  http://www.wtfpl.net/about/
  //  http://www.wtfpl.net/txt/copying/
  // http://let.hatelabo.jp/noromanba/let/hJmevPLog7ty
  //
  // ### Waveform algorithm by a-kuma3
  // Unknown (as-is)
  //  http://h.hatena.ne.jp/a-kuma3/315649928894883680
  
  

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