
/*
 *
 * TERMS OF USE - EASING EQUATIONS
 * 
 * Open source under the BSD License. 
 * 
 * Copyright © 2001 Robert Penner
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, 
 * are permitted provided that the following conditions are met:
 * 
 * Redistributions of source code must retain the above copyright notice, this list of 
 * conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice, this list 
 * of conditions and the following disclaimer in the documentation and/or other materials 
 * provided with the distribution.
 * 
 * Neither the name of the author nor the names of contributors may be used to endorse 
 * or promote products derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY 
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 *  COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 *  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 *  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 
 * OF THE POSSIBILITY OF SUCH DAMAGE. 
 *
 */
// http://paulirish.com/2011/requestanimationframe-for-smart-animating/
// http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating

// requestAnimationFrame polyfill by Erik M?ller. fixes from Paul Irish and Tino Zijdel

// MIT license

(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);
        };
}());
/*!
 * VERSION: 1.13.1
 * DATE: 2014-07-22
 * UPDATES AND DOCS AT: http://www.greensock.com
 *
 * @license Copyright (c) 2008-2014, GreenSock. All rights reserved.
 * This work is subject to the terms at http://www.greensock.com/terms_of_use.html or for
 * Club GreenSock members, the software agreement that was issued with your membership.
 * 
 * @author: Jack Doyle, jack@greensock.com
 */
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e,i=t.propName,s=t.priority||0,n=t.overwriteProps,r={init:"_onInitTween",set:"setRatio",kill:"_kill",round:"_roundProps",initAll:"_onInitAllProps"},a=v("plugins."+i.charAt(0).toUpperCase()+i.substr(1)+"Plugin",function(){J.call(this,i,s),this._overwriteProps=n||[]},t.global===!0),o=a.prototype=new J(i);o.constructor=a,a.API=t.API;for(e in r)"function"==typeof t[e]&&(o[r[e]]=t[e]);return a.version=t.version,J.activate([a]),a},s=t._gsQueue){for(n=0;s.length>n;n++)s[n]();for(r in p)p[r].func||t.console.log("GSAP encountered missing dependency: com.greensock."+r)}o=!1}})("undefined"!=typeof module&&module.exports&&"undefined"!=typeof global?global:this||window,"TweenLite");
$( function() {

    var width, height, canvas, ctx, points, target, animateHeader = true;

    // Main
    initHeader();
    initAnimation();
    addListeners();

    function initHeader() {
        width = window.innerWidth;
        height = window.innerHeight;
        target = {
            x: width / 2,
            y: height / 3
        };

        canvas = document.getElementById( 'spiders' );
        canvas.width = width;
        canvas.height = height;
        ctx = canvas.getContext( '2d' );

        // create points
        points = [];
        for ( var x = 0; x < width; x = x + width / 20 ) {
            for ( var y = 0; y < height; y = y + height / 20 ) {
                var px = x + Math.random() * width / 20;
                var py = y + Math.random() * height / 20;
                var p = {
                    x: px,
                    originX: px,
                    y: py,
                    originY: py
                };
                points.push( p );
            }
        }

        // for each point find the 5 closest points
        for ( var i = 0; i < points.length; i++ ) {
            var closest = [];
            var p1 = points[ i ];
            for ( var j = 0; j < points.length; j++ ) {
                var p2 = points[ j ]
                if ( !( p1 == p2 ) ) {
                    var placed = false;
                    for ( var k = 0; k < 5; k++ ) {
                        if ( !placed ) {
                            if ( closest[ k ] == undefined ) {
                                closest[ k ] = p2;
                                placed = true;
                            }
                        }
                    }

                    for ( var k = 0; k < 5; k++ ) {
                        if ( !placed ) {
                            if ( getDistance( p1, p2 ) < getDistance( p1, closest[ k ] ) ) {
                                closest[ k ] = p2;
                                placed = true;
                            }
                        }
                    }
                }
            }
            p1.closest = closest;
        }

        // assign a circle to each point
        for ( var i in points ) {
            var c = new Circle( points[ i ], 2 + Math.random() * 2, 'rgba(255,255,255,0.3)' );
            points[ i ].circle = c;
        }
    }

    // Event handling
    function addListeners() {
        /*
		if ( !( 'ontouchstart' in window ) ) {
            window.addEventListener( 'mousemove', mouseMove );
        }
		*/
        window.addEventListener( 'scroll', scrollCheck );
        window.addEventListener( 'resize', resize );
    }

    function mouseMove( e ) {
        var posx = posy = 0;
        if ( e.pageX || e.pageY ) {
            posx = e.pageX;
            posy = e.pageY;
        } else if ( e.clientX || e.clientY ) {
            posx = e.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;
            posy = e.clientY + document.body.scrollTop + document.documentElement.scrollTop;
        }
        target.x = posx;
        target.y = posy;
    }

    function scrollCheck() {
        if ( document.body.scrollTop > height ) animateHeader = false;
        else animateHeader = true;
    }

    function resize() {
        width = window.innerWidth;
        height = window.innerHeight;
        canvas.width = width;
        canvas.height = height;
    }

    // animation
    function initAnimation() {
        animate();
        for ( var i in points ) {
            shiftPoint( points[ i ] );
        }
    }

    function animate() {
        if ( animateHeader ) {
            ctx.clearRect( 0, 0, width, height );
            for ( var i in points ) {
                // detect points in range
                if ( Math.abs( getDistance( target, points[ i ] ) ) < 2000 ) {
                    points[ i ].active = 0.2;
                    points[ i ].circle.active = 0.5;
                } else if ( Math.abs( getDistance( target, points[ i ] ) ) < 20000 ) {
                    points[ i ].active = 0.1;
                    points[ i ].circle.active = 0.3;
                } else if ( Math.abs( getDistance( target, points[ i ] ) ) < 70000 ) {
                    points[ i ].active = 0.02;
                    points[ i ].circle.active = 0.09;
                } else if ( Math.abs( getDistance( target, points[ i ] ) ) < 140000 ) {
                    points[ i ].active = 0;
                    points[ i ].circle.active = 0.02;
                } else {
                    points[ i ].active = 0;
                    points[ i ].circle.active = 0;
                }

                drawLines( points[ i ] );
                points[ i ].circle.draw();
            }
        }
        requestAnimationFrame( animate );
    }

    function shiftPoint( p ) {
        TweenLite.to( p, 1 + 1 * Math.random(), {
            x: p.originX - 50 + Math.random() * 100,
            y: p.originY - 50 + Math.random() * 100,
            onComplete: function() {
                shiftPoint( p );
            }
        } );
    }

    // Canvas manipulation
    function drawLines( p ) {
        if ( !p.active ) return;
        for ( var i in p.closest ) {
            ctx.beginPath();
            ctx.moveTo( p.x, p.y );
            ctx.lineTo( p.closest[ i ].x, p.closest[ i ].y );
            ctx.strokeStyle = 'rgba(255,255,255,' + p.active + ')';
            ctx.stroke();
        }
    }

    function Circle( pos, rad, color ) {
        var _this = this;

        // constructor
        ( function() {
            _this.pos = pos || null;
            _this.radius = rad || null;
            _this.color = color || null;
        } )();

        this.draw = function() {
            if ( !_this.active ) return;
            ctx.beginPath();
            ctx.arc( _this.pos.x, _this.pos.y, _this.radius, 0, 2 * Math.PI, false );
            ctx.fillStyle = 'rgba(0,0,0,' + _this.active + ')';
            ctx.fill();
        };
    }

    // Util
    function getDistance( p1, p2 ) {
        return Math.pow( p1.x - p2.x, 2 ) + Math.pow( p1.y - p2.y, 2 );
    }

} );
