@{
    ViewBag.Title = "Authentication";
    Layout = null;
}



<script>


    // min and max radius, radius threshold and percentage of filled circles
    var radMin = 5,
      radMax = 125,
      filledCircle = 60, //percentage of filled circles
      concentricCircle = 30, //percentage of concentric circles
      radThreshold = 25; //IFF special, over this radius concentric, otherwise filled

    //min and max speed to move
    var speedMin = 0.3,
      speedMax = 2.5;

    //max reachable opacity for every circle and blur effect
    var maxOpacity = 0.6;

    //default palette choice
    var colors = ['52,168,83', '117,95,147', '199,108,23', '194,62,55', '0,172,212', '120,120,120'],
      bgColors = ['52,168,83', '117,95,147', '199,108,23', '194,62,55', '0,172,212', '120,120,120'],
      circleBorder = 10,
      backgroundLine = bgColors[0];
    var backgroundMlt = 0.85;

    //min distance for links
    var linkDist = Math.min(canvas.width, canvas.height) / 2.4,
      lineBorder = 2.5;

    //most importantly: number of overall circles and arrays containing them
    var maxCircles = 12,
      points = [],
      pointsBack = [];

    //populating the screen
    for (var i = 0; i < maxCircles * 2; i++) points.push(new Circle());
    for (var i = 0; i < maxCircles; i++) pointsBack.push(new Circle(true));

    //experimental vars
    var circleExp = 1,
      circleExpMax = 1.003,
      circleExpMin = 0.997,
      circleExpSp = 0.00004,
      circlePulse = false;

    //circle class
    function Circle(background) {
        //if background, it has different rules
        this.background = (background || false);
        this.x = randRange(-canvas.width / 2, canvas.width / 2);
        this.y = randRange(-canvas.height / 2, canvas.height / 2);
        this.radius = background ? hyperRange(radMin, radMax) * backgroundMlt : hyperRange(radMin, radMax);
        this.filled = this.radius < radThreshold ? (randint(0, 100) > filledCircle ? false : 'full') : (randint(0, 100) > concentricCircle ? false : 'concentric');
        this.color = background ? bgColors[randint(0, bgColors.length - 1)] : colors[randint(0, colors.length - 1)];
        this.borderColor = background ? bgColors[randint(0, bgColors.length - 1)] : colors[randint(0, colors.length - 1)];
        this.opacity = 0.05;
        this.speed = (background ? randRange(speedMin, speedMax) / backgroundMlt : randRange(speedMin, speedMax)); // * (radMin / this.radius);
        this.speedAngle = Math.random() * 2 * Math.PI;
        this.speedx = Math.cos(this.speedAngle) * this.speed;
        this.speedy = Math.sin(this.speedAngle) * this.speed;
        var spacex = Math.abs((this.x - (this.speedx < 0 ? -1 : 1) * (canvas.width / 2 + this.radius)) / this.speedx),
          spacey = Math.abs((this.y - (this.speedy < 0 ? -1 : 1) * (canvas.height / 2 + this.radius)) / this.speedy);
        this.ttl = Math.min(spacex, spacey);
    };

    Circle.prototype.init = function () {
        Circle.call(this, this.background);
    }

    //support functions
    //generate random int a<=x<=b
    function randint(a, b) {
        return Math.floor(Math.random() * (b - a + 1) + a);
    }
    //generate random float
    function randRange(a, b) {
        return Math.random() * (b - a) + a;
    }
    //generate random float more likely to be close to a
    function hyperRange(a, b) {
        return Math.random() * Math.random() * Math.random() * (b - a) + a;
    }

    //rendering function
    function drawCircle(ctx, circle) {
        //circle.radius *= circleExp;
        var radius = circle.background ? circle.radius *= circleExp : circle.radius /= circleExp;
        ctx.beginPath();
        ctx.arc(circle.x, circle.y, radius * circleExp, 0, 2 * Math.PI, false);
        ctx.lineWidth = Math.max(1, circleBorder * (radMin - circle.radius) / (radMin - radMax));
        ctx.strokeStyle = ['rgba(', circle.borderColor, ',', circle.opacity, ')'].join('');
        if (circle.filled == 'full') {
            ctx.fillStyle = ['rgba(', circle.borderColor, ',', circle.background ? circle.opacity * 0.8 : circle.opacity, ')'].join('');
            ctx.fill();
            ctx.lineWidth = 0;
            ctx.strokeStyle = ['rgba(', circle.borderColor, ',', 0, ')'].join('');
        }
        ctx.stroke();
        if (circle.filled == 'concentric') {
            ctx.beginPath();
            ctx.arc(circle.x, circle.y, radius / 2, 0, 2 * Math.PI, false);
            ctx.lineWidth = Math.max(1, circleBorder * (radMin - circle.radius) / (radMin - radMax));
            ctx.strokeStyle = ['rgba(', circle.color, ',', circle.opacity, ')'].join('');
            ctx.stroke();
        }
        circle.x += circle.speedx;
        circle.y += circle.speedy;
        if (circle.opacity < (circle.background ? maxOpacity : 1)) circle.opacity += 0.01;
        circle.ttl--;
    }

    //initializing function
    function init() {
        window.requestAnimationFrame(draw);
    }

    //rendering function
    function draw() {

        if (circlePulse) {
            if (circleExp < circleExpMin || circleExp > circleExpMax) circleExpSp *= -1;
            circleExp += circleExpSp;
        }
        var ctxfr = document.getElementById('canvas').getContext('2d');
        var ctxbg = document.getElementById('canvasbg').getContext('2d');

        ctxfr.globalCompositeOperation = 'destination-over';
        ctxfr.clearRect(0, 0, canvas.width, canvas.height); // clear canvas
        ctxbg.globalCompositeOperation = 'destination-over';
        ctxbg.clearRect(0, 0, canvas.width, canvas.height); // clear canvas

        ctxfr.save();
        ctxfr.translate(canvas.width / 2, canvas.height / 2);
        ctxbg.save();
        ctxbg.translate(canvas.width / 2, canvas.height / 2);

        //function to render each single circle, its connections and to manage its out of boundaries replacement
        function renderPoints(ctx, arr) {
            for (var i = 0; i < arr.length; i++) {
                var circle = arr[i];
                //checking if out of boundaries
                if (circle.ttl < 0) { }
                var xEscape = canvas.width / 2 + circle.radius,
                  yEscape = canvas.height / 2 + circle.radius;
                if (circle.ttl < -20) arr[i].init(arr[i].background);
                //if (Math.abs(circle.y) > yEscape || Math.abs(circle.x) > xEscape) arr[i].init(arr[i].background);
                drawCircle(ctx, circle);
            }
            for (var i = 0; i < arr.length - 1; i++) {
                for (var j = i + 1; j < arr.length; j++) {
                    var deltax = arr[i].x - arr[j].x;
                    var deltay = arr[i].y - arr[j].y;
                    var dist = Math.pow(Math.pow(deltax, 2) + Math.pow(deltay, 2), 0.5);
                    //if the circles are overlapping, no laser connecting them
                    if (dist <= arr[i].radius + arr[j].radius) continue;
                    //otherwise we connect them only if the dist is < linkDist
                    if (dist < linkDist) {
                        var xi = (arr[i].x < arr[j].x ? 1 : -1) * Math.abs(arr[i].radius * deltax / dist);
                        var yi = (arr[i].y < arr[j].y ? 1 : -1) * Math.abs(arr[i].radius * deltay / dist);
                        var xj = (arr[i].x < arr[j].x ? -1 : 1) * Math.abs(arr[j].radius * deltax / dist);
                        var yj = (arr[i].y < arr[j].y ? -1 : 1) * Math.abs(arr[j].radius * deltay / dist);
                        ctx.beginPath();
                        ctx.moveTo(arr[i].x + xi, arr[i].y + yi);
                        ctx.lineTo(arr[j].x + xj, arr[j].y + yj);
                        var samecolor = arr[i].color == arr[j].color;
                        ctx.strokeStyle = ["rgba(", arr[i].borderColor, ",", Math.min(arr[i].opacity, arr[j].opacity) * ((linkDist - dist) / linkDist), ")"].join("");
                        ctx.lineWidth = (arr[i].background ? lineBorder * backgroundMlt : lineBorder) * ((linkDist - dist) / linkDist); //*((linkDist-dist)/linkDist);
                        ctx.stroke();
                    }
                }
            }
        }

        var startTime = Date.now();
        renderPoints(ctxfr, points);
        renderPoints(ctxbg, pointsBack);
        deltaT = Date.now() - startTime;

        ctxfr.restore();
        ctxbg.restore();

        window.requestAnimationFrame(draw);
    }

    init();

    /*Credits and aknowledgements:
    Original Idea and Design by Luca Luzzatti
    
    Optimizing tips from Benjamin Kästner
    General tips from Salvatore Previti*/


</script>

<html>



<body>
    <style>

        html,
body {
  overflow: hidden;
  background: #262b2e
}

#wrapper {
  height:100%;
  width:100%;
  text-align: center;
  display: table;
  position:absolute;
}

#title {
  display: table-cell;
  vertical-align: middle;
  z-index: 999;
}

#title h2 {
  color: #fff;
  font-size: 45px;
  font-family: "museo-slab";
}

#title h3 {
  color: #fff;
  font-size: 25px;
  font-family: "museo-sans";
  font-weight: 300
}


#wrapper canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 1950px;
  height: auto; 
}

#canvas {
  z-index: 1;
}
#canvasbg {
  z-index: -10;
  -webkit-filter: blur(3px);
  -moz-filter: blur(3px);
  -o-filter: blur(3px);
  filter: blur(3px);
  opacity: 0.6;
}

    </style>


    <div id="wrapper">

        <div id="title">
            <h2>UNITED IN RESEARCH</h2>
            <h3>
                Together we can make a difference in the world of academia
            </h3>
        </div>


        <canvas id="canvas" style="width:1950px;height:800px"></canvas>
        <canvas id="canvasbg" style="width:1950px;height:800px"></canvas>
    </div>
</body>

</html>