威海蓝堇网络-网络应用综合服务商

赢创进销存软件,功能齐全,使用方便,欢迎大家下载使用,本站将于近期录制相关演示说明帮助大家安装和使用。

插件代码
(function() { var width, height, largeHeader, canvas, ctx, points, target, animateHeader = true; // Main initHeader(); initAnimation(); addListeners(); function initHeader() { width = window.innerWidth; height = window.innerHeight; target = {x: width/2, y: height/2}; largeHeader = document.getElementById('large-header'); largeHeader.style.height = height+'px'; canvas = document.getElementById('demo-canvas'); 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; largeHeader.style.height = height+'px'; 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])) < 4000) { points[i].active = 0.3; points[i].circle.active = 0.6; } 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])) < 40000) { points[i].active = 0.02; points[i].circle.active = 0.1; } 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, ease:Circ.easeInOut, 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(156,217,249,'+ 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(156,217,249,'+ _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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