Created
February 12, 2012 21:06
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I 'borrowed' this JavaScript from a page, and am tweaking it a bit. Pretty cool effect.
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| <html> | |
| <head> | |
| <title>Pixie</title> | |
| </head> | |
| <body style="background:#000;"> | |
| <canvas id="pixie" style="display:block;margin:50px auto;width:480px;"></canvas> | |
| <script src="pixie.js"></script> | |
| <script> | |
| window.onload = function() { | |
| canvas = document.getElementById('pixie'); | |
| canvas.setAttribute("width",WIDTH); | |
| canvas.setAttribute("height",HEIGHT); | |
| con = canvas.getContext('2d'); | |
| for(var i = 0; i < 100; i++) { | |
| pxs[i] = new Circle(); | |
| pxs[i].reset(); | |
| } | |
| setInterval(draw,rint); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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| var canvas, con, g, pxs = new Array(), rint = 60, | |
| WIDTH = 480, | |
| HEIGHT = 580; | |
| function draw() { | |
| con.clearRect(0,0,WIDTH,HEIGHT); | |
| for(var i = 0; i < pxs.length; i++) { | |
| pxs[i].fade(); | |
| pxs[i].move(); | |
| pxs[i].draw(); | |
| } | |
| } | |
| function Circle() { | |
| this.color = '49,102,152'; // '77,101,181' | |
| this.s = {ttl:8000, xmax:5, ymax:2, rmax:10, rt:1, xdef:960, ydef:540, xdrift:4, ydrift: 4, random:true, blink:true}; | |
| this.reset = function() { | |
| this.x = (this.s.random ? WIDTH*Math.random() : this.s.xdef); | |
| this.y = (this.s.random ? HEIGHT*Math.random() : this.s.ydef); | |
| this.r = ((this.s.rmax-1)*Math.random()) + 1; | |
| this.dx = (Math.random()*this.s.xmax) * (Math.random() < .5 ? -1 : 1); | |
| this.dy = (Math.random()*this.s.ymax) * (Math.random() < .5 ? -1 : 1); | |
| this.hl = (this.s.ttl/rint)*(this.r/this.s.rmax); | |
| this.rt = Math.random()*this.hl; | |
| this.s.rt = Math.random()+1; | |
| this.stop = Math.random()*.2+.4; | |
| this.s.xdrift *= Math.random() * (Math.random() < .5 ? -1 : 1); | |
| this.s.ydrift *= Math.random() * (Math.random() < .5 ? -1 : 1); | |
| } | |
| this.fade = function() { | |
| this.rt += this.s.rt; | |
| } | |
| this.draw = function() { | |
| if(this.s.blink && (this.rt <= 0 || this.rt >= this.hl)) this.s.rt = this.s.rt*-1; | |
| else if(this.rt >= this.hl) this.reset(); | |
| var newo = 1-(this.rt/this.hl); | |
| con.beginPath(); | |
| con.arc(this.x,this.y,this.r,0,Math.PI*2,true); | |
| con.closePath(); | |
| var cr = this.r*newo; | |
| g = con.createRadialGradient(this.x,this.y,0,this.x,this.y,(cr <= 0 ? 1 : cr)); | |
| g.addColorStop(0.0, 'rgba(255,255,255,'+newo+')'); | |
| g.addColorStop(this.stop, 'rgba('+this.color+','+(newo*.6)+')'); | |
| g.addColorStop(1.0, 'rgba('+this.color+',0)'); | |
| con.fillStyle = g; | |
| con.fill(); | |
| } | |
| this.move = function() { | |
| this.x += (this.rt/this.hl)*this.dx; | |
| this.y += (this.rt/this.hl)*this.dy; | |
| if(this.x > WIDTH || this.x < 0) this.dx *= -1; | |
| if(this.y > HEIGHT || this.y < 0) this.dy *= -1; | |
| } | |
| this.getX = function() { return this.x; } | |
| this.getY = function() { return this.y; } | |
| } |
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