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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <header>
    <span id="wrap"></span>
    <span id="arrow"></span>
    <h1>HTML5 Perlin Noise simmulation</h1>
    <span class='header-open'> click on <label id="label">+</label> for more info </span>

    <!-- Description about the experiment-->
    <div class="description">
        <div class="horizontal-line">
            <span style="width: 100%"></span>
        </div>

        <section id="about">            
            <p id accesskey="a" class="about">
                HTML5 adapted perlin noise simulation. <br/>The perlin noise algorithm was ported to JS from the    original Java class <a target="_blank" href="https://mrl.nyu.edu/~perlin/noise/">https://mrl.nyu.edu/~perlin/noise/</a>. This is <a href="http://staffwww.itn.liu.se/~stegu/simplexnoise/simplexnoise.pdf" target='blank'>the paper</a> written by Stefan Gustavson which explains thoroughly the Perlin noise method. I relied to it a lot during implementation.<br/>
            </p>            

        </section>
    </div>

    <div class="vertical-line"></div>    

</header> 

<div class="wrapper">   
    <div class="context"></div> 
    <h1>Hold the mouse and drag for panning</h1>   
</div> 
            
          
!
            
              @import "https://fonts.googleapis.com/css?family=Dosis:600|Roboto+Slab:100,300,400,700";
@import url(https://fonts.googleapis.com/css?family=Roboto+Condensed:300);

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: #111;
    margin: 0;
    padding: 0;
    -webkit-user-select: none;
    -moz-user-select: none;
    -khtml-user-select: none;
    user-select: none;
}

/*******************************
*           HEADER             *
********************************/

header {
    position: absolute;
    background: rgba(14, 14, 14, 0.4);
    opacity: 0.7;
    z-index: 10;
    height: 40px;
    width: 100%;
    padding: 0 8px 8px 8px;
    overflow: hidden;
    font-family: "Roboto Slab",​sans-serif;
    font-size: 16px;
    color: #fff;
    text-shadow: 1px 1px 1px #333;  
    text-decoration: none;
    display: inline-block;
    box-shadow: 0px 2px 8px rgba(0, 0, 0, 0.80);
    -moz-box-shadow: 0px 2px 8px rgba(0, 0, 0, 0.80);
    -webkit-box-shadow: 0px 2px 8px rgba(0, 0, 0, 0.80);

    -webkit-transition: height .20s ease-in-out;
       -moz-transitoon: height .20s ease-in-out;
         -o-transition: height .20s ease-in-out;
            transition: height .20s ease-in-out;
}

header #arrow {
    color: #adff2f;
    float: left;    
    margin-right: 15px; margin-top: 8px;    
    font-family: "Times New Roman", sans-serif;
    font-size: 26px;
    z-index: 2;    
    cursor: pointer;    
    -webkit-transition: all 0.9s cubic-bezier(0.165, 0.84, 0.44, 1) 0s;
    -moz-transition: all 0.9s cubic-bezier(0.165, 0.84, 0.44, 1) 0s;
    -o-transition: all 0.9s cubic-bezier(0.165, 0.84, 0.44, 1) 0s;
    -ms-transition: all 0.9s cubic-bezier(0.165, 0.84, 0.44, 1) 0s;
    transition: all 0.9s cubic-bezier(0.165, 0.84, 0.44, 1) 0s;
    -webkit-transform:rotate(0deg);
    -moz-transform:rotate(0deg);
    -o-transform:rotate(0deg);
    -ms-transform:rotate(0deg);
    transform: rotate(0deg);
    
}

#arrow.animate {
    -webkit-transition: all 0.9s cubic-bezier(0.165, 0.84, 0.44, 1) 0s;
    -moz-transition: all 0.9s cubic-bezier(0.165, 0.84, 0.44, 1) 0s;
    -o-transition: all 0.9s cubic-bezier(0.165, 0.84, 0.44, 1) 0s;
    -ms-transition: all 0.9s cubic-bezier(0.165, 0.84, 0.44, 1) 0s;
    transition: all 0.9s cubic-bezier(0.165, 0.84, 0.44, 1) 0s;
    -webkit-transform:rotate(135deg);
    -moz-transform:rotate(135deg);
    -o-transform:rotate(135deg);
    -ms-transform:rotate(135deg);
    transform: rotate(135deg);
}

header #arrow:before {
    content: "\2b";
}

.header-open #label {
    color: #fff;
}

header #wrap {
    position: absolute;
    width: 100%; height: 100%;
    opacity: 0.4;    
    z-index: -10;
}

header h1 {
    cursor: default;
    font-size: 90%;
    font-weight: 200;
    float: left;
    position: relative;
    display: inline-block;    
    text-transform: uppercase;
    vertical-align: middle;
    z-index: 3;
    opacity: 0.9;
}

header .header-open {
    clear: both;
    float: left;
    margin-top: -10px;
    padding: 0 0 5px;
    padding-left: 128px;
    display: inline-block;
    text-decoration: none;
    text-transform: none;
    font-family: "Molengo", Times, "Times New Roman", cursive;
    font-weight: normal;
    font-size: 10pt;
    color: GrayText;

    -webkit-transition: opacity .4s cubic-bezier(0.215, 0.610, 0.355, 1.000);
       -moz-transition: opacity .4s cubic-bezier(0.215, 0.610, 0.355, 1.000);
        -ms-transition: opacity .4s cubic-bezier(0.215, 0.610, 0.355, 1.000);
         -o-transition: opacity .4s cubic-bezier(0.215, 0.610, 0.355, 1.000);
            transition: opacity .4s cubic-bezier(0.215, 0.610, 0.355, 1.000);

}

/*******************************
* Header description
********************************/

header .description {
    clear: both;
    position: absolute;
    padding: 5px 10px;
    font-family: "Roboto Condensed", Helvetica, Arial, sans-serif;
    font-weight: normal;
    text-align: justify;
    color: #dcdcdc;
    font-size: 11pt;
    width: 400px;
    margin: 55px 20px;

    background-color:rgba(0,0,0,.2);
    -webkit-border-radius:4px;
       -moz-border-radius:4px;
        -ms-border-radius:4px;
            border-radius:4px;

    -webkit-box-shadow:0 1px 0 rgba(255,255,255,.05),inset 0 1px 0 rgba(0,0,0,.2);
       -moz-box-shadow:0 1px 0 rgba(255,255,255,.05),inset 0 1px 0 rgba(0,0,0,.2);
        -ms-box-shadow:0 1px 0 rgba(255,255,255,.05),inset 0 1px 0 rgba(0,0,0,.2);
            box-shadow:0 1px 0 rgba(255,255,255,.05),inset 0 1px 0 rgba(0,0,0,.2);

    -webkit-transition: opacity .4s cubic-bezier(0.215, 0.610, 0.355, 1.000);
       -moz-transition: opacity .4s cubic-bezier(0.215, 0.610, 0.355, 1.000);
        -ms-transition: opacity .4s cubic-bezier(0.215, 0.610, 0.355, 1.000);
         -o-transition: opacity .4s cubic-bezier(0.215, 0.610, 0.355, 1.000);
            transition: opacity .4s cubic-bezier(0.215, 0.610, 0.355, 1.000);
}

.horizontal-line {
    height: 1px;
    margin-top: -20px;
    padding-top: 5px;
    position: relative;
    border-top-style: solid;
    border-top-width: 1px;
    border-top-color: rgba(247,247,247, 0.6);
    border-bottom-style: hidden;
    border-left-style: hidden;
    border-right-style: hidden;
    opacity: 0;    

    -webkit-transition: opacity .4s ease-out;
       -moz-transition: opacity .4s ease-out;
        -ms-transition: opacity .4s ease-out;
         -o-transition: opacity .4s ease-out;
            transition: opacity .4s ease-out;
}

span[article] {
    font-style: italic;
}



header h2 {
    text-transform: uppercase;
    font-size: 10pt;
    margin-top: 14px;
    margin-left: 20px;
    color: #fff;
}

/*******************************
* Header dropdown animation
********************************/

header.animate {
    height: 200px;
}

header.animate .horizontal-line {
    margin-top: -40px;
    opacity: 1;
}

header.animate .header-open {
    opacity: 0;
}

header.animate .description {
    padding-top: 25px;
}

a {
    text-decoration: none;
    color: #adff2f;
}


/*******************************
* Main display
********************************/

div#main {
    position:relative!important; display: block!important; width: 900px!important; height: 600px!important;
    width: 100%;
    margin: 0 auto;
    border: 1px solid #222;
    -webkit-border-radius: 2px;
    -moz-border-radius: 2px;
    -ms-border-radius: 2px;
    -o-border-radius: 2px;
    border-radius: 2px;

    -webkit-box-shadow: 0px 2px 17px rgba(0,0,0,.80), inset 0 0 15px 15px rgba(5,5,5,.2);
       -moz-box-shadow: 0px 2px 17px rgba(0,0,0,.80), inset 0 0 15px 15px rgba(5,5,5,.2);
            box-shadow: 0px 2px 17px rgba(0,0,0,.80), inset 0 0 15px 15px rgba(5,5,5,.2);
}

div.context {
    position:realtive;
    width: 820px; height: 620px;
    margin: 0 auto;
    border: 1px solid #222;
    -webkit-border-radius: 2px;
    -moz-border-radius: 2px;
    -ms-border-radius: 2px;
    -o-border-radius: 2px;
    border-radius: 2px;

    -webkit-box-shadow: 0px 2px 17px rgba(0,0,0,.80), inset 0 0 15px 15px rgba(5,5,5,.2);
       -moz-box-shadow: 0px 2px 17px rgba(0,0,0,.80), inset 0 0 15px 15px rgba(5,5,5,.2);
            box-shadow: 0px 2px 17px rgba(0,0,0,.80), inset 0 0 15px 15px rgba(5,5,5,.2);
}

div.wrapper {
    position: absolute;
    width: 100%; margin: 0; padding: 0;
    top: 160px;
}

.context #canvas {
    position: relative;
    width: 800px; height: 600px;
    left: 10px;
    top: 10px;
}

.no-canvas {
    color: #999999;
    font-size: 24px;
    text-align: center;
    margin-top: 150px;
}

h1 { 
    font-size: 26px; 
    font-family: "Roboto Slab",​sans-serif;
    font-weight: 200;    
    margin: 0 auto;    
    width:24%;
    color: #fff;
    opacity: 0.6;
    padding: 10px 0;
}
            
          
!
            
              /*******************************
*             HEADER           *
********************************/

window.onload = function() {
    var toggleMouseDown = true;
    var toggleTimer = -1;
    var headerArrow = document.querySelector('#arrow');
    var header = document.getElementsByTagName('header')[0];

    document.addEventListener('click', onMouseClick, false);
    document.addEventListener('mousedown', onMouseDown, false);

    function onMouseClick(e) {
        e.stopPropagation();
        toggleMouseDown = true;

        if (e.target === headerArrow && toggleMouseDown) {
            if (header.className === '') {
                clearTimeout(toggleTimer);

                toggleMouseDown = false;
                toggleTimer = setTimeout(function() {
                    header.setAttribute('class', 'animate');
                    headerArrow.setAttribute('class', 'animate');
                }, 1000/60);
            } else if (header.className === 'animate') {
                clearTimeout(toggleTimer);

                toggleTimer = setTimeout(function() {
                    header.setAttribute('class', '');
                    headerArrow.setAttribute('class', '');
                }, 1000/60);
            }
        }
    }

    function onMouseDown(e) {
        e.stopPropagation();

        removeEventListener('click', onMouseClick, false);
        if (e.target !== headerArrow) {
            clearTimeout(toggleTimer);

            toggleTimer = setTimeout(function() {
                header.setAttribute('class', '');
                headerArrow.setAttribute('class', '');
            }, 1000/60);
        } else  if (!toggleMouseDown) {
            toggleMouseDown = true;
            clearTimeout(toggleTimer);
            header.setAttribute('class', 'animate');
            headerArrow.setAttribute('class', 'animate');
        }
    }

    function getArrow(elt) {
        var supportCSS3 = document.body.style['MozPerspective'] !== undefined ||
                          document.body.style['webkitPerspective'] !== undefined;

        if (supportCSS3) {
            var selector = document.querySelectorAll(elt);
            var nodeLength = selector.length;

            for (var i=0; i< nodeLength; i++) {
                var node = selector[i];
                if (node.className && !node.class.match('/animate/g')) {
                    node.className += 'animate';
                    node.innerHTML = '<span data-name="' + node.text + '">' + node.innerHTML + '</span>';
                }
            }
        }
    }    
};

var NOISE = NOISE || { };

NOISE.Perlin = (function() {
    var iOctaves = 1,
        fPersistence = 0.2,
        fResult, fFreq, fPers,
        aOctFreq, // frequency per octave
        aOctPers, // persistance per octave
        fPersMax; // 1 / max persistence

    var octaveFreq = function() {
        var fFreq, fPers;
        aOctFreq = new Array();
        aOctPers = new Array();
        fPersMax = 0;

        for (var i=0; i < iOctaves; i++) {
            fFreq = Math.pow(2,i);
            fPers = Math.pow(fPersistence, i);
            fPersMax += fPers;
            aOctFreq.push(fFreq);
            aOctPers.push(fPers);
        }

        fPersMax = 2 / fPersMax;
    }

    var perm = new Uint8Array(512);
    var p = new Uint8Array(256);

    var grad3 = [[1,1,0],[-1,1,0],[1,-1,0],[-1,-1,0],
                [1,0,1],[-1,0,1],[1,0,-1],[-1,0,-1],
                [0,1,1],[0,-1,1],[0,1,-1],[0,-1,-1]];

    // Return the dot product for 2d perlin noise
    function dot2(g, x, y) {
        return g[0]*x + g[1]*y;
    }

    // Return the dot product for 3d perlin noise
    function dot3(g, x, y, z) {
        return g[0]*x + g[1]*y + g[2]*z;
    }

    // Seeded random number generator
    function seed(x) {
        x = (x<<13) ^ x;
        return ( 1.0 - ( (x * (x * x * 15731 + 789221) + 1376312589) & 0x7fffffff) / 1073741824.0);
    }

    function init() {
        for (var i = 0; i < 256; i++) {
            p[i] = Math.abs(~~(seed(i) * 256));
        }

        // To remove the need for index wrapping, double the permutation table length
        for (var i=0; i < 512; i++) {
            perm[i] = p[i & 255];
        }
    }

    /*
     ** 2D Simplex Noise
     */
    function noise2D (x, y, z) {

        // Find unit grid cell containing point
        var X = Math.floor(x) & 255;
        var Y = Math.floor(y) & 255;

        // Get relative xyz coordinates of point within that cell
        x -= Math.floor(x);
        y -= Math.floor(y);

        var fade = function(t) {
            return t * t * t * (t * (t * 6.0 - 15.0) + 10.0);
        };

        var lerp = function(a, b, t) {
            return (1.0-t)*a + t*b;
        }

        var u = fade(x),
            v = fade(y);

        // Calculate a set of four hashed gradient indices
        var n00 = perm[X   + perm[Y  ]] % 12;
        var n01 = perm[X   + perm[Y+1]] % 12;
        var n10 = perm[X+1 + perm[Y+1]] % 12;
        var n11 = perm[X+1 + perm[Y+1]] % 12;

        // Calculate noise contributions from each of the four corners
        var gi00 = dot2(grad3[n00], x,   y  );
        var gi01 = dot2(grad3[n01], x,   y-1);
        var gi10 = dot2(grad3[n10], x-1, y  );
        var gi11 = dot2(grad3[n11], x-1, y-1);

        // Interpolate the results along axises
        return lerp(
            lerp(gi00, gi10, u),
            lerp(gi01, gi11, u),
        v);
    }

    /*
     ** 3D Simplex Noise
     */
    function noise3D (x, y, z) {

        // Find unit grid cell containing point
        var X = Math.floor(x) & 255;
        var Y = Math.floor(y) & 255;
        var Z = Math.floor(z) & 255;

        // Get relative xyz coordinates of point within that cell
        x -= Math.floor(x);
        y -= Math.floor(y);
        z -= Math.floor(z);

        var fade = function(t) {
            return t * t * t * (t * (t * 6.0 - 15.0) + 10.0);
        };

        var lerp = function(a, b, t) {
            return (1.0-t)*a + t*b;
        }

        var u = fade(x),
            v = fade(y),
            w = fade(z);

        // Calculate a set of eight hashed gradient indices
        var n000 = perm[X + perm[Y + perm[Z  ]]] % 12;
        var n001 = perm[X + perm[Y + perm[Z+1]]] % 12;
        var n010 = perm[X + perm[Y+1+perm[Z  ]]] % 12;
        var n011 = perm[X + perm[Y+1+perm[Z+1]]] % 12;
        var n100 = perm[X+1+perm[Y + perm[Z  ]]] % 12;
        var n101 = perm[X+1+perm[Y + perm[Z+1]]] % 12;
        var n110 = perm[X+1+perm[Y+1+perm[Z  ]]] % 12;
        var n111 = perm[X+1+perm[Y+1+perm[Z+1]]] % 12;

        // Calculate noise contributions from each of the eight corners
        var gi000 = dot3(grad3[n000], x,   y,   z  );
        var gi001 = dot3(grad3[n001], x,   y,   z-1);
        var gi010 = dot3(grad3[n010], x,   y-1, z  );
        var gi011 = dot3(grad3[n011], x,   y-1, z-1);
        var gi100 = dot3(grad3[n100], x-1, y,   z  );
        var gi101 = dot3(grad3[n101], x-1, y,   z-1);
        var gi110 = dot3(grad3[n110], x-1, y-1, z  );
        var gi111 = dot3(grad3[n111], x-1, y-1, z-1);

        // Interpolate the results along axises
        return lerp(
            lerp(
              lerp(gi000, gi100, u),
              lerp(gi001, gi101, u), w),
            lerp(
              lerp(gi010, gi110, u),
              lerp(gi011, gi111, u), w),
        v);
    }

    function PerlinNoise(){}

    PerlinNoise.prototype = {
        init : init,

        noise : function(x, y, z) {
            fResult = 0;

            for (var i=0; i < iOctaves; i++) {
                fFreq = aOctFreq[i];
                fPers = aOctPers[i];

                switch(arguments.length) {
                    case 3 : fResult += fPers * noise3D(fFreq*x, fFreq*y, fFreq*z);
                        break;
                    case 2 : fResult += fPers * noise2D(fFreq*x, fFreq*y);
                        break;
                    default : fResult += fPers * noise3D(fFreq*x, fFreq*y, fFreq*z);
                        break;
                }
            }

            return (fResult * fPersMax + 0.8) * 0.5
        },

        noiseDetail : function(octaves, persistance) {
            iOctaves = octaves || iOctaves;
            fPersistence = persistance || fPersistence;
            octaveFreq();
        }
    }

    return PerlinNoise;

}).call(this);

/*******************************
*      MAIN IMPLEMENTATION     *
********************************/

// Request animation frame
(function() {
    var lastTime = 0;
    var vendors = ['ms', 'moz', 'webkit', 'o'];
    for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
        window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
        window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame']
            || window[vendors[x]+'CancelRequestAnimationFrame'];
    }

    if (!window.requestAnimationFrame)
        window.requestAnimationFrame = function(callback, element) {
            var currTime = new Date().getTime();
            var timeToCall = Math.max(0, 16 - (currTime - lastTime));
            var id = window.setTimeout(function() { callback(currTime + timeToCall); },
                timeToCall);
            lastTime = currTime + timeToCall;
            return id;
        };

    if (!window.cancelAnimationFrame)
        window.cancelAnimationFrame = function(id) {
            clearTimeout(id);
        };
}());

var perlin = new NOISE.Perlin();
perlin.init();
perlin.noiseDetail(1, 2.8);

var canvas = document.createElement('canvas');
canvas.setAttribute('width', '384');
canvas.setAttribute('height', '320');
canvas.setAttribute('id', 'canvas');
var mainContext = document.getElementsByClassName('context')[0];
mainContext.appendChild(canvas);  

var ctx = canvas.getContext('2d');
var cx = 0, 
    cy = 0, 
    lastX = 0, 
    lastY = 0,
    dx = 0, 
    dy = 0;

var valx = 1, valy = 1;
var mouseDown = false;

var image = ctx.createImageData(canvas.width, canvas.height);
var data = image.data;

var fTime = 0, fDeltaT = 0, fLastTime = 0;

if (!this.millis) {
    var millis = function() {
        return new Date().getTime();
    };
}

function getScrollX() {
    return window.pageXOffset || window.document.documentElement.scrollLeft;
}

function getScrollY() {
    return window.pageYOffset || window.document.documentElement.scrollTop;
}

function getMousePos(event) {    
    event.preventDefault();
    dx = event.pageX - (getScrollX() + canvas.getBoundingClientRect().left);
    dy = event.pageY - (getScrollY() + canvas.getBoundingClientRect().top) ;        
    lastX = event.pageX - (getScrollX() + canvas.getBoundingClientRect().left) - cx;
    lastY = event.pageY - (getScrollY() + canvas.getBoundingClientRect().top) - cy;    

    return {
        x: lastX,
        y: lastY
    }    
}

function getTouchPos(event) {    
    event.preventDefault();
    dx = event.changedTouches[0].pageX - (getScrollX() + canvas.getBoundingClientRect().left) - lastX;
    dy = event.changedTouches[0].pageY - (getScrollY() + canvas.getBoundingClientRect().top) - lastY;    
    lastX = event.changedTouches[0].pageX - (getScrollX() + canvas.getBoundingClientRect().left);
    lastY = event.changedTouches[0].pageY - (getScrollY() + canvas.getBoundingClientRect().top);        

    lastX = lastX > 0 ? (lastX < canvas.width ? lastX : canvas.width) : 0;
    lastY = lastY > 0 ? (lastY < canvas.height ? lastY : canvas.height) : 0;        

    return {
        x: lastX,
        y: lastY
    }    
}

window.addEventListener('resize', function() {        
    var canvasWidth = window.getComputedStyle(canvas, null).getPropertyValue('width');
    var canvasHeight = window.getComputedStyle(canvas, null).getPropertyValue('height');
    canvasWidth = parseInt(canvasWidth.substring(-2));
    canvasHeight = parseInt(canvasHeight.substring(-2));  

    var container = document.getElementsByClassName('wrapper')[0];    
    container.style.top = ( window.innerHeight - canvasHeight ) / 2 + 'px';        
});

canvas.addEventListener('mousemove', onMouseMove);

canvas.addEventListener('mousedown', function(event) {    
    event.preventDefault();
    cx = event.pageX - (getScrollX() + canvas.getBoundingClientRect().left) - lastX;
    cy = event.pageY - (getScrollY() + canvas.getBoundingClientRect().top) - lastY;    
    mouseDown = true;    
});

canvas.addEventListener('mouseup', function(event) {
    event.preventDefault();
    mouseDown = false;
});


// Mobile devices touch events
canvas.addEventListener('touchstart', function(event) {    
    event.preventDefault();    
    lastX = event.changedTouches[0].pageX - (getScrollX() + canvas.getBoundingClientRect().left);
    lastY = event.changedTouches[0].pageY - (getScrollY() + canvas.getBoundingClientRect().top);            
    mouseDown = true;      
});

canvas.addEventListener('touchmove', onTouchMove);

canvas.addEventListener('touchend', function(event) {    
    event.preventDefault();
    mouseDown = false;
});

function onMouseMove(e) {
    if (getMousePos(e).y <= 40) return;  
    if (mouseDown) {
        valx = dx * 0.02; valy = dy * 0.02;
    } else {
        if (dx == undefined) return;        
    }       
}

function onTouchMove(e) {
    if (getTouchPos(e).y <= 40) return;    
    if (mouseDown) {
        valx = dx * 0.02; valy = dy * 0.02;        
    } else {
        if (dx == undefined) return;        
    }
}

function draw() {
    fDeltaT = millis()-fLastTime;
    fLastTime = millis();
    var start = Date.now();

    fTime += fDeltaT * 0.0005;

    for (var x = 0; x < canvas.width; x++) {
        for (var y = 0; y < canvas.height; y++) {            
            var fXDff = x-.5*canvas.width;
            var fYDff = y-.5*canvas.height;
            var fDst = Math.sqrt(fXDff*fXDff+fYDff*fYDff) / canvas.width;
            //var value = Math.floor(fDst*fDst*(perlin.noise(x / 50, y / 50, fTime) )*1096);
            //var value = Math.abs(perlin.noise(x / 50, y / 50, fTime) * .08) * 1096;
            //var value = 256 - Math.floor(Math.pow(perlin.noise(x / 100, y / 100, fTime) * 4, y));
            //var value = Math.abs(perlin.noise(10*x / 100, y*0.5 / 100, fTime));
            var value = Math.abs(perlin.noise(x / 60 * (valx / valy), y / 60 * (valx / valy), fTime));
            value *= 256;

            var cell = (x + y * canvas.width) * 4;
            data[cell] = data[cell + 1] = data[cell + 2] = value;
            data[cell] += Math.max(0, (25 - value) * 8);
            //data[cell] *= Math.random() * Math.max((valx / valy) * 0.001, 1) - 1;
            data[cell + 3] = 255; // alpha.
        }
    }

    var end = Date.now();

    ctx.fillColor = 'black';
    ctx.fillRect(0, 0, canvas.width, canvas.height);
    ctx.putImageData(image, 0, 0);

    ctx.font = '12px sans-serif'
    ctx.textAlign = 'center';
}

render();

function render() {
    var id = requestAnimationFrame(render);
    draw();
};
            
          
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