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Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

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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.

HTML

              
                <div style="height:100%;background:#000">
  <canvas id="can" style="background:#111"></canvas>
</div>

<div class="item">
  <span data-color='{"red":255,"green":165,"blue":0}'>Hover me</span>
</div>

              
            
!

CSS

              
                html {height:100%;padding:0;margin:0;background:#000}
body {padding:0;margin:0;height:100%;line-height:1.3rem;font-family: 'Quicksand', sans-serif}
    
.item {width:100px;height:20px;text-align:center;padding:10px;background:rgba(255,255,255,0.3);position:absolute;left:50%;top:50%}
              
            
!

JS

              
                var Stars = function()
{
    var me = this;
    var canEle = document.getElementById('can');
    var can    = canEle.getContext('2d');
    var height = 0;
    var width  = 0;

    var mdDefault = 150;
    var mdHover   = 500;
    var mdDec     = true;

    var max           = 200;
    var distance      = 100;
    var mouseDistance = mdDefault;

    var stars    = new Array(max);
    var mouse    = {
        x : width / 2,
        y : height / 2
    };

    var defaultRed   = 255;
    var defaultGreen = 255;
    var defaultBlue  = 255;

    var red   = defaultRed;
    var green = defaultGreen;
    var blue  = defaultBlue;

    var targetRed   = red;
    var targetGreen = green;
    var targetBlue  = blue;

    var speedDefault = 1;
    var speedHover   = 15;
    var speed        = speedDefault;

    var maxTime = 0;
    var minTime = 1000;

    var moving   = false;
    var lastTime = new Date();

    var arcCache = {};

    me.start = function()
    {
        if (navigator.appVersion.match('Chrome')) {
            max = 300;
        }

        resize();
        createStars();
        //setInterval(run, 1000 / 30);
        run();

        document.onmousemove = mousemove;

        $('span[href]').click(function() {
            $('span[href]').not($(this)).css('opacity', 0);
            location.href = $(this).attr('href');

            return false;
        });

        $('.item').hover(function() {
            //moving        = true;
            mdDec         = false;
            speed         = speedHover;
            var color = c = $(this).children().eq(0).data('color');

            if (!color) {
                targetRed   = defaultRed;
                targetGreen = defaultGreen;
                targetBlue  = defaultBlue;
            } else {
                targetRed   = color.red;
                targetGreen = color.green;
                targetBlue  = color.blue;
            }
        }, function() {
            moving        = false;
            mdDec         = true;
            speed         = speedDefault;
            targetRed     = defaultRed;
            targetGreen   = defaultGreen;
            targetBlue    = defaultBlue;
        });
    };

    var mousemove = function(e)
    {
        mouse.x = e.pageX;
        mouse.y = e.pageY;
    };

    var run = function()
    {
        clean();
        drawStars();
    };

    var drawStars = function()
    {
        for (var i = 0; i < max; i++) {
            stars[i].connected = [];
        }

        var time = new Date();

        setColors();
        can.lineWidth   = 1;
        var dist        = 0.0;

        if (mdDec && mouseDistance > mdDefault) {
            mouseDistance -= 80;
        } else if (!mdDec && mouseDistance < mdHover) {
            mouseDistance += 80;
        }

        for (var i = 0; i < max; i++) {
            if (!moving) {
                moveStar(stars[i]);
            }

            var star = stars[i];

            dist     = Math.sqrt(Math.pow(star.x - mouse.x, 2) + Math.pow(star.y - mouse.y, 2));

            if (dist < mouseDistance * 2) {
                can.fillStyle   = 'rgb('.concat(red, ',', green, ',',  blue, ')');
            } else {
                can.fillStyle   = 'rgba('.concat(red, ',', green, ',',  blue, ', 0.3)');
            }

            can.fillRect(star.x, star.y, star.size / 2, star.size);

            can.beginPath();
            if (dist < mouseDistance) {
                star.arc = true;

                for (var j = 0; j < max; j++) {
                    var refStar = stars[j];

                    if (star == refStar || refStar.connected.indexOf(star) != -1) {
                        continue;
                    }

                    if (
                        Math.abs(star.x - refStar.x) < distance &&
                        Math.abs(star.y - refStar.y) < distance
                    ) {
                        star.connected.push(refStar);
                        drawRelation(star, refStar);
                    }
                }
            } else {
                star.arc = false;
            }

            can.stroke();
            can.closePath();
        }



        for (var i = 0; i < max; i++) {
            if (stars[i].arc) {
                arc(stars[i]);
            }
        }

        var nDate = new Date();
        var time  = nDate.getTime() - time.getTime();

        if (time > maxTime) {
            maxTime = time;
        }

        if (time < minTime) {
            minTime = time;
        }

        can.fillStyle = '#fff';
        can.fillText('PROCESS TIME PER FRAME - cur: ' + time, 10, 20);
        can.fillText('PROCESS TIME PER FRAME - max: ' + maxTime, 10, 40);
        can.fillText('PROCESS TIME PER FRAME - min: ' + minTime, 10, 60);

        var avFps = parseInt(1000 / time + 15);
        var fps   = parseInt(nDate.getTime() - lastTime.getTime());

        if (fps > avFps) {
            fps = avFps;
        }

        can.fillText('possible FPS: ' + avFps, 10, 80);
        can.fillText('current  FPS: ' + fps, 10, 100);
        lastTime = new Date();

        setTimeout(run, (1000 / 30) - time); //sollte am Ende stehen, damit sich die Prozedur nicht überholen kann
    };

    var arc = function(star)
    {
        var r = star.size * 2;
        can.drawImage(star.cache, star.x - r, star.y - r, r * 2, r * 2);
    }

    var setColors = function()
    {
        var percent = 10;

        if (targetRed != red) {
            var tick = Math.floor(Math.abs(targetRed - red) / percent);

            if (targetRed > red) {
                red += tick;
            } else {
                red -= tick;
            }
        }
        if (targetGreen != green) {
            var tick = Math.floor(Math.abs(targetGreen - green) / percent);

            if (targetGreen > green) {
                green += tick;
            } else {
                green -= tick;
            }
        }
        if (targetBlue != blue) {
            var tick = Math.floor(Math.abs(targetBlue - blue) / percent);

            if (targetBlue > blue) {
                blue += tick;
            } else {
                blue -= tick;
            }
        }

        can.fillStyle   = 'rgb('.concat(red, ',', green, ',',  blue, ')');
        can.strokeStyle = 'rgba('.concat(red, ',', green, ',',  blue, ', 0.3)');
    }

    var drawRelation = function(star, refStar)
    {
        can.moveTo(star.x | 0, star.y | 0);

        if (true) {
            can.lineTo(refStar.x | 0, refStar.y | 0);
            return;
        } else {
            var midX = Math.max(star.x, refStar.x) - (Math.max(star.x, refStar.x) - Math.min(star.x, refStar.x)) / 2;
            var midY = Math.max(star.y, refStar.y) - (Math.max(star.y, refStar.y) - Math.min(star.y, refStar.y)) / 2;

            if (star.curve > 0) {
                midX += 20;
                midY += 20;
            } else {
                midX -= 20;
                midY -= 20;
            }
        }
    };

    var moveStar = function(star)
    {
        star.x += star.dirX * speed;
        star.y += star.dirY * speed;

        if (star.y > height) {
            star.dirY = Math.random() * -1;
        } else if (star.y < 0) {
            star.dirY = Math.random();
        } else if (star.x > width) {
            star.dirX = Math.random() * -1;
        } else if (star.x < 0) {
            star.dirX = Math.random();
        }

        return star;
    };

    var clean = function()
    {
        can.fillStyle = 'rgb(0, 0, 0)';
        can.fillRect(0, 0, width, height);
    };

    var createStars = function()
    {
        for (var i = 0; i < max; i++) {
           stars[i] = createStar();
        }
    };

    var createStar = function()
    {
        var star = {
            x     : Math.random() * width,
            y     : Math.random() * height,
            dirX  : (Math.random() - 0.5),
            dirY  : (Math.random() - 0.5),
            size  : Math.ceil(Math.random() * 3),
            curve : (Math.random() - 0.5),
            line  : (Math.random() - 0.5),
            arc   : false
        };

        initCache(star);

        return star;
    };

    var initCache = function(star)
    {
        var cache = $(document.createElement('canvas'));
        var c     = cache.get(0).getContext('2d');
        var r     = star.size * 2;

        cache.attr({
            width  : star.size * 4,
            Height : star.size * 4
        });

        c.fillStyle = 'rgba(200, 200, 200, 0.5)';
        c.beginPath();
        c.arc(r, r, r, 0, 2*Math.PI);
        c.fill();

        star.cache = cache.get(0);
    }

    var resize = function()
    {
        height = canEle.parentElement.offsetHeight - 10;
        width  = canEle.parentElement.offsetWidth - 10;
        canEle.style.width  = ''.concat(width, 'px');
        canEle.style.height = ''.concat(height, 'px');
        canEle.setAttribute('width', width);
        canEle.setAttribute('height', height);
    }
};


var stars = new Stars();
stars.start();
              
            
!
999px

Console