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HTML 

              
                <pre class="morph-section">
</pre>

<div class="info">
  Ascii Morph - <a href="https://github.com/tholman/ascii-morph" target="_blank">source</a> - Built for my <a href="http://tholman.com" target="_blank">website</a>
</div>
!

CSS 

              
                body {
  background: #222222;
}

.morph-section {
  width: 400px;
  height: 400px;

  position: absolute;
  left: 50%;
  top: 50%;
  margin-top: -200px;
  margin-left: -200px;
  font-family: monospace;
  color: #fff;
}

.info {
  font-family: monospace;
  position: absolute;
  line-height: 20px;
  font-size: 14px;
  left: 20px;
  bottom: 20px;
  color: #fff;
}

a {
  color: #f9f9f9;
}
!

JS 

              
                /**
 * Ascii Morph
 * @author: Tim Holman (http://tholman.com)
 */

var AsciiMorph = (function() {

  'use strict';
  
  var element = null;
  var canvasDimensions = {};
  
  var renderedData = [];
  var framesToAnimate = [];
  var myTimeout = null;
  
  /**
   * Utils
   */

  function extend(target, source) {
    for (var key in source) {
      if (!(key in target)) {
        target[key] = source[key];              
      }
    }
    return target;
  }
  
  function repeat(pattern, count) {
      if (count < 1) return '';
      var result = '';
      while (count > 1) {
          if (count & 1) result += pattern;
          count >>= 1, pattern += pattern;
      }
      return result + pattern;
  }
  
  function replaceAt(string, index, character ) {
    return string.substr(0, index) + character + string.substr(index+character.length);
  }
  
  /**
   * AsciiMorph
   */

  function init(el, canvasSize) {
    
    // Save the element
    element = el;
    canvasDimensions = canvasSize;
  }
  
  function squareOutData(data) {
     var i;
    var renderDimensions = {
      x: 0,
      y: data.length
    };

    // Calculate centering numbers
    for( i = 0; i < data.length; i++ ) {
      if( data[i].length > renderDimensions.x) {
        renderDimensions.x = data[i].length
      }
    }
    
    // Pad out right side of data to square it out
    for( i = 0; i < data.length; i++ ) {
      if( data[i].length < renderDimensions.x) {
        data[i] = (data[i] + repeat(' ', renderDimensions.x - data[i].length ));
      }
    }
    
    var paddings = {
      x: Math.floor((canvasDimensions.x - renderDimensions.x) / 2),
      y: Math.floor((canvasDimensions.y - renderDimensions.y) / 2)
    }
    
    // Left Padding
    for( var i = 0; i < data.length; i++ ) {
      data[i] = repeat(' ', paddings.x) + data[i] + repeat(' ', paddings.x);
    }
    
    // Pad out the rest of everything
    for( var i = 0; i < canvasDimensions.y; i++ ) {
      if( i < paddings.y) {
        data.unshift( repeat(' ', canvasDimensions.x));
      } else if (i > (paddings.y + renderDimensions.y)) {
        data.push( repeat(' ', canvasDimensions.x));
      }
    }
    
    return data;
  }
  
  // Crushes the frame data by 1 unit.
  function getMorphedFrame(data) {
    
    var firstInLine, lastInLine = null;
    var found = false;
    for( var i = 0; i < data.length; i++) {
      
      var line = data[i];
      firstInLine = line.search(/\S/);
      if( firstInLine === -1) {
        firstInLine = null;
      }
      
      for( var j = 0; j < line.length; j++) {
        if( line[j] != ' ') {
          lastInLine = j;
        }
      }
      
      if( firstInLine !== null && lastInLine !== null) {
        data = crushLine(data, i, firstInLine, lastInLine)
        found = true;
      }
  
      firstInLine = null, lastInLine = null;
    }
    
    if( found ) {
      return data;
    } else {
      return false;
    }
  }
  
  function crushLine(data, line, start, end) {
    
    var centers = {
      x: Math.floor(canvasDimensions.x / 2),
      y: Math.floor(canvasDimensions.y / 2)
    }
    
    var crushDirection = 1;
    if( line > centers.y ) {
      crushDirection = -1;
    }
    
    var charA = data[line][start];
    var charB = data[line][end];
    
    data[line] = replaceAt(data[line], start, " ");
    data[line] = replaceAt(data[line], end, " ");

    if( !((end - 1) == (start + 1)) && !(start === end) && !((start + 1) === end)) {
      data[line + crushDirection] = replaceAt(data[line + crushDirection], (start + 1), '+*/\\'.substr(Math.floor(Math.random()*'+*/\\'.length), 1));
      data[line + crushDirection] = replaceAt(data[line + crushDirection], (end - 1), '+*/\\'.substr(Math.floor(Math.random()*'+*/\\'.length), 1));
    } else if ((((start === end) || (start + 1) === end)) && ((line + 1) !== centers.y && (line - 1) !== centers.y && line !== centers.y)) {
      data[line + crushDirection] = replaceAt(data[line + crushDirection], (start), '+*/\\'.substr(Math.floor(Math.random()*'+*/\\'.length), 1));
      data[line + crushDirection] = replaceAt(data[line + crushDirection], (end), '+*/\\'.substr(Math.floor(Math.random()*'+*/\\'.length), 1));
    }
    
    return data;
  }
  
  function render(data) {
    var ourData = squareOutData(data.slice());
    renderSquareData(ourData);
  }
  
  function renderSquareData(data) {
    element.innerHTML = '';
    for( var i = 0; i < data.length; i++ ) {
      element.innerHTML = element.innerHTML + data[i] + '\n';
    }
    
    renderedData = data;
  }
  
  // Morph between whatever is current, to the new frame
  function morph(data) {
    
    clearTimeout(myTimeout);
    var frameData = prepareFrames(data.slice());
    animateFrames(frameData);
  }
  
  function prepareFrames(data) {
    
    var deconstructionFrames = [];
    var constructionFrames = [];

    var clonedData = renderedData
    
    // If its taking more than 100 frames, its probably somehow broken
    // Get the deconscrution frames
    for(var i = 0; i < 100; i++) {
      var newData = getMorphedFrame(clonedData);
      if( newData === false) {
        break;
      }
      deconstructionFrames.push(newData.slice(0)); 
      clonedData = newData;
    }
    
    // Get the constuction frames for the new data
    var squareData = squareOutData(data);
    constructionFrames.unshift(squareData.slice(0));
    for( var i = 0; i < 100; i++ ) {
      var newData = getMorphedFrame(squareData);
      if( newData === false) {
        break;
      }
      constructionFrames.unshift(newData.slice(0));
      squareData = newData;
    }
    
    return deconstructionFrames.concat(constructionFrames)
  }
  
  function animateFrames(frameData) {
    framesToAnimate = frameData;
    animateFrame();
  }
  
  function animateFrame() {
    myTimeout = setTimeout(function() {
      
      renderSquareData(framesToAnimate[0]);
      framesToAnimate.shift();
      if( framesToAnimate.length > 0 ) {
        animateFrame();
      }
    }, 20)

    // framesToAnimate
  }

  function main(element, canvasSize) {
    
    if( !element || !canvasSize ) {
      console.log("sorry, I need an element and a canvas size");
      return;   
    }
    
    init(element, canvasSize);
  }

  return extend(main, {
    render: render,
    morph: morph
  });
  
})();

var element = document.querySelector('pre');
AsciiMorph(element, {x: 51,y: 28});

var asciis = [[
"                _ooOoo_",
"               o8888888o",
"               88\" . \"88",
"               (| -_- |)",
"               O\\  =  /O",
"            ____/`---'\\____",
"          .'  \\\\|     |//  `.",
"         /  \\\\|||  :  |||//  \\",
"        /  _||||| -:- |||||_  \\",
"        |   | \\\\\\  -  /'| |   |",
"        | \\_|  `\\`---'//  |_/ |",
"        \\  .-\\__ `-. -'__/-.  /",
"      ___`. .'  /--.--\\  `. .'___",
"   .\"\" '<  `.___\\_<|>_/___.' _> \\\"\".",
"  | | :  `- \\`. ;`. _/; .'/ /  .' ; |",
"  \\  \\ `-.   \\_\\_`. _.'_/_/  -' _.' /",
"===`-.`___`-.__\\ \\___  /__.-'_.'_.-'===",
"                `=--=-'    "
],

[
"                             /",
"                            /",
"                           /;",
"                          //",
"                         ;/",
"                       ,//",
"                   _,-' ;_,,",
"                _,'-_  ;|,'",
"            _,-'_,..--. |",
"    ___   .'-'_)'  ) _)\\|      ___",
"  ,'\"\"\"`'' _  )   ) _)  ''--'''_,-'",
"-={-o-  /|    )  _)  ) ; '_,--''",
"  \\ -' ,`.  ) .)  _)_,''|",
"   `.\"(   `------''     /",
"     `.\\             _,'",
"       `-.____....-\\\\",
"                 || \\\\",
"                 // ||",
"                //  ||",
"            _-.//_ _||_,",
"              ,'  ,-'/"
],

[
"      \\`.     ___",
"       \\ \\   / __>0",
"   /\\  /  |/' / ",
"  /  \\/   `  ,`'--.",
" / /(___________)_ \\",
" |/ //.-.   .-.\\\\ \\ \\",
" 0 // :@ ___ @: \\\\ \/",
"   ( o ^(___)^ o ) 0",
"    \\ \\_______/ /",
"/\\   '._______.'--.",
"\\ /|  |<_____>    |",
" \\ \\__|<_____>____/|__",
"  \\____<_____>_______/",
"      |<_____>    |",
"      |<_____>    |",
"      :<_____>____:",
"     / <_____>   /|",
"    /  <_____>  / |",
"   /___________/  |",
"   |           | _|__",
"   |           | ---||_",
"   |   |L\\/|/  |  | [__]",
"   |  \\|||\\|\\  |  /",
"   |           | /",
"   |___________|/"
],

[
"     .--------.",
"    / .------. \\",
"   / /        \\ \\",
"   | |        | |",
"  _| |________| |_",
".' |_|        |_| '.",
"'._____ ____ _____.'",
"|     .'____'.     |",
"'.__.'.'    '.'.__.'",
"'.__  |      |  __.'",
"|   '.'.____.'.'   |",
"'.____'.____.'____.'",
"'.________________.'",
],

[
"         ____",
"        o8%8888,",
"      o88%8888888.",
"     8'-    -:8888b",
"    8'         8888",
"   d8.-=. ,==-.:888b",
"   >8 `~` :`~' d8888",
"   88         ,88888",
"   88b. `-~  ':88888",
"   888b ~==~ .:88888",
"   88888o--:':::8888",
"   `88888| :::' 8888b",
"   8888^^'       8888b",
"  d888           ,%888b.",
" d88%            %%%8--'-.",
"/88:.__ ,       _%-' ---  -",
"    '''::===..-'   =  --.  `",
 ],

 [
"      _      _      _",
"   __(.)< __(.)> __(.)=",
"   \\___)  \\___)  \\___)  ",
"          _      _      _",
"       __(.)< __(.)> __(.)=",
"       \\___)  \\___)  \\___)   ",
"      _      _      _",
"   __(.)< __(.)> __(.)=",
"   \\___)  \\___)  \\___)   ",
"          _      _      _",
"       __(.)< __(.)> __(.)=",
"       \\___)  \\___)  \\___)  "
 ]];

AsciiMorph.render(asciis[0]);

var currentIndex = 2;

setTimeout(function() {
  AsciiMorph.morph(asciis[1]);
}, 1000);

setInterval(function() {
  AsciiMorph.morph(asciis[currentIndex]);
  currentIndex++;
  currentIndex%= asciis.length;
}, 3000);
!
999px

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