.jpg)
hiệu ứng khá dẹp sử dụng html5 trông như ma trận các nút phân tử hóa học vậy
demo
http://codepen.io/thetwistedtaste/pen/GgrWLp
để thêm hiệu ứng rê chuột kiểu hóa học này ta làm như sau
B1: html ngay sau <body>
<canvas id="spiders" class="hidden-xs" width="1280" height="451"></canvas>
B2 : thêm css
body { background:url(https://ununsplash.imgix.net/photo-1416934625760-d56f5e79f6fe?fit=crop&fm=jpg&h=725&q=75&w=1050) center center; overflow:hidden; margin:0; padding:0; background-size:cover;}
i {
position: absolute;
top:0; bottom:0;left:0;right:0;
display:block;
background:rgba(192, 57, 43,.5);
z-index:-1;
}
canvas#spiders {
height:100vh;
}
B3 : add javascript :
/*
*
* 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 Möller. 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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U[r])._onInitTween(e,this.vars[r],this)){for(this._firstPT=h={_next:this._firstPT,t:l,p:"setRatio",s:0,c:1,f:!0,n:r,pg:!0,pr:l._priority},a=l._overwriteProps.length;--a>-1;)i[l._overwriteProps[a]]=this._firstPT;(l._priority||l._onInitAllProps)&&(o=!0),(l._onDisable||l._onEnable)&&(this._notifyPluginsOfEnabled=!0)}else this._firstPT=i[r]=h={_next:this._firstPT,t:e,p:r,f:"function"==typeof e[r],n:r,pg:!1,pr:0},h.s=h.f?e[r.indexOf("set")||"function"!=typeof e["get"+r.substr(3)]?r:"get"+r.substr(3)]():parseFloat(e[r]),h.c="string"==typeof _&&"="===_.charAt(1)?parseInt(_.charAt(0)+"1",10)*Number(_.substr(2)):Number(_)-h.s||0;h&&h._next&&(h._next._prev=h)}return n&&this._kill(n,e)?this._initProps(e,i,s,n):this._overwrite>1&&this._firstPT&&s.length>1&&K(e,this,i,this._overwrite,s)?(this._kill(i,e),this._initProps(e,i,s,n)):(this._firstPT&&(this.vars.lazy!==!1&&this._duration||this.vars.lazy&&!this._duration)&&(L[e._gsTweenID]=!0),o)},r.render=function(t,e,i){var s,n,r,a,o=this._time,l=this._duration,h=this._rawPrevTime;if(t>=l)this._totalTime=this._time=l,this.ratio=this._ease._calcEnd?this._ease.getRatio(1):1,this._reversed||(s=!0,n="onComplete"),0===l&&(this._initted||!this.vars.lazy||i)&&(this._startTime===this._timeline._duration&&(t=0),(0===t||0>h||h===_)&&h!==t&&(i=!0,h>_&&(n="onReverseComplete")),this._rawPrevTime=a=!e||t||h===t?t:_);else if(1e-7>t)this._totalTime=this._time=0,this.ratio=this._ease._calcEnd?this._ease.getRatio(0):0,(0!==o||0===l&&h>0&&h!==_)&&(n="onReverseComplete",s=this._reversed),0>t?(this._active=!1,0===l&&(this._initted||!this.vars.lazy||i)&&(h>=0&&(i=!0),this._rawPrevTime=a=!e||t||h===t?t:_)):this._initted||(i=!0);else if(this._totalTime=this._time=t,this._easeType){var u=t/l,f=this._easeType,m=this._easePower;(1===f||3===f&&u>=.5)&&(u=1-u),3===f&&(u*=2),1===m?u*=u:2===m?u*=u*u:3===m?u*=u*u*u:4===m&&(u*=u*u*u*u),this.ratio=1===f?1-u:2===f?u:.5>t/l?u/2:1-u/2}else this.ratio=this._ease.getRatio(t/l);if(this._time!==o||i){if(!this._initted){if(this._init(),!this._initted||this._gc)return;if(!i&&this._firstPT&&(this.vars.lazy!==!1&&this._duration||this.vars.lazy&&!this._duration))return this._time=this._totalTime=o,this._rawPrevTime=h,O.push(this),this._lazy=t,void 0;this._time&&!s?this.ratio=this._ease.getRatio(this._time/l):s&&this._ease._calcEnd&&(this.ratio=this._ease.getRatio(0===this._time?0:1))}for(this._lazy!==!1&&(this._lazy=!1),this._active||!this._paused&&this._time!==o&&t>=0&&(this._active=!0),0===o&&(this._startAt&&(t>=0?this._startAt.render(t,e,i):n||(n="_dummyGS")),this.vars.onStart&&(0!==this._time||0===l)&&(e||this.vars.onStart.apply(this.vars.onStartScope||this,this.vars.onStartParams||T))),r=this._firstPT;r;)r.f?r.t[r.p](r.c*this.ratio+r.s):r.t[r.p]=r.c*this.ratio+r.s,r=r._next;this._onUpdate&&(0>t&&this._startAt&&this._startTime&&this._startAt.render(t,e,i),e||(this._time!==o||s)&&this._onUpdate.apply(this.vars.onUpdateScope||this,this.vars.onUpdateParams||T)),n&&(!this._gc||i)&&(0>t&&this._startAt&&!this._onUpdate&&this._startTime&&this._startAt.render(t,e,i),s&&(this._timeline.autoRemoveChildren&&this._enabled(!1,!1),this._active=!1),!e&&this.vars[n]&&this.vars[n].apply(this.vars[n+"Scope"]||this,this.vars[n+"Params"]||T),0===l&&this._rawPrevTime===_&&a!==_&&(this._rawPrevTime=0))}},r._kill=function(t,e){if("all"===t&&(t=null),null==t&&(null==e||e===this.target))return this._lazy=!1,this._enabled(!1,!1);e="string"!=typeof e?e||this._targets||this.target:I.selector(e)||e;var i,s,n,r,a,o,l,h;if((m(e)||E(e))&&"number"!=typeof e[0])for(i=e.length;--i>-1;)this._kill(t,e[i])&&(o=!0);else{if(this._targets){for(i=this._targets.length;--i>-1;)if(e===this._targets[i]){a=this._propLookup[i]||{},this._overwrittenProps=this._overwrittenProps||[],s=this._overwrittenProps[i]=t?this._overwrittenProps[i]||{}:"all";break}}else{if(e!==this.target)return!1;a=this._propLookup,s=this._overwrittenProps=t?this._overwrittenProps||{}:"all"}if(a){l=t||a,h=t!==s&&"all"!==s&&t!==a&&("object"!=typeof t||!t._tempKill);for(n in l)(r=a[n])&&(r.pg&&r.t._kill(l)&&(o=!0),r.pg&&0!==r.t._overwriteProps.length||(r._prev?r._prev._next=r._next:r===this._firstPT&&(this._firstPT=r._next),r._next&&(r._next._prev=r._prev),r._next=r._prev=null),delete a[n]),h&&(s[n]=1);!this._firstPT&&this._initted&&this._enabled(!1,!1)}}return o},r.invalidate=function(){return 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I(e,0,{delay:t,onComplete:e,onCompleteParams:i,onCompleteScope:s,onReverseComplete:e,onReverseCompleteParams:i,onReverseCompleteScope:s,immediateRender:!1,useFrames:n,overwrite:0})},I.set=function(t,e){return new I(t,0,e)},I.getTweensOf=function(t,e){if(null==t)return[];t="string"!=typeof t?t:I.selector(t)||t;var i,s,n,r;if((m(t)||E(t))&&"number"!=typeof t[0]){for(i=t.length,s=[];--i>-1;)s=s.concat(I.getTweensOf(t[i],e));for(i=s.length;--i>-1;)for(r=s[i],n=i;--n>-1;)r===s[n]&&s.splice(i,1)}else for(s=$(t).concat(),i=s.length;--i>-1;)(s[i]._gc||e&&!s[i].isActive())&&s.splice(i,1);return s},I.killTweensOf=I.killDelayedCallsTo=function(t,e,i){"object"==typeof e&&(i=e,e=!1);for(var s=I.getTweensOf(t,e),n=s.length;--n>-1;)s[n]._kill(i,t)};var 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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(255,255,255,' + _this.active + ')';
ctx.fill();
};
}
// Util
function getDistance( p1, p2 ) {
return Math.pow( p1.x - p2.x, 2 ) + Math.pow( p1.y - p2.y, 2 );
}
} );
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