A vanilla.js canvas confetti animation. Move the mouse to change direction.
A Pen by Kevin Granger on CodePen.
Created
May 6, 2014 20:39
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A Pen by Kevin Granger.
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| <canvas id="world"></canvas> |
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| NUM_CONFETTI = 350 | |
| COLORS = [[85,71,106], [174,61,99], [219,56,83], [244,92,68], [248,182,70]] | |
| PI_2 = 2*Math.PI | |
| canvas = document.getElementById "world" | |
| context = canvas.getContext "2d" | |
| window.w = 0 | |
| window.h = 0 | |
| resizeWindow = -> | |
| window.w = canvas.width = window.innerWidth | |
| window.h = canvas.height = window.innerHeight | |
| window.addEventListener 'resize', resizeWindow, false | |
| window.onload = -> setTimeout resizeWindow, 0 | |
| range = (a,b) -> (b-a)*Math.random() + a | |
| drawCircle = (x,y,r,style) -> | |
| context.beginPath() | |
| context.arc(x,y,r,0,PI_2,false) | |
| context.fillStyle = style | |
| context.fill() | |
| xpos = 0.5 | |
| document.onmousemove = (e) -> | |
| xpos = e.pageX/w | |
| window.requestAnimationFrame = do -> | |
| window.requestAnimationFrame || | |
| window.webkitRequestAnimationFrame || | |
| window.mozRequestAnimationFrame || | |
| window.oRequestAnimationFrame || | |
| window.msRequestAnimationFrame || | |
| (callback) -> window.setTimeout(callback, 1000 / 60) | |
| class Confetti | |
| constructor: -> | |
| @style = COLORS[~~range(0,5)] | |
| @rgb = "rgba(#{@style[0]},#{@style[1]},#{@style[2]}" | |
| @r = ~~range(2,6) | |
| @r2 = 2*@r | |
| @replace() | |
| replace: -> | |
| @opacity = 0 | |
| @dop = 0.03*range(1,4) | |
| @x = range(-@r2,w-@r2) | |
| @y = range(-20,h-@r2) | |
| @xmax = w-@r | |
| @ymax = h-@r | |
| @vx = range(0,2)+8*xpos-5 | |
| @vy = 0.7*@r+range(-1,1) | |
| draw: -> | |
| @x += @vx | |
| @y += @vy | |
| @opacity += @dop | |
| if @opacity > 1 | |
| @opacity = 1 | |
| @dop *= -1 | |
| @replace() if @opacity < 0 or @y > @ymax | |
| if !(0 < @x < @xmax) | |
| @x = (@x + @xmax) % @xmax | |
| drawCircle(~~@x,~~@y,@r,"#{@rgb},#{@opacity})") | |
| confetti = (new Confetti for i in [1..NUM_CONFETTI]) | |
| window.step = -> | |
| requestAnimationFrame(step) | |
| context.clearRect(0,0,w,h) | |
| c.draw() for c in confetti | |
| step() |
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| html, body { | |
| margin: 0; | |
| padding: 0; | |
| width: 100%; | |
| height: 100%; | |
| overflow: hidden; | |
| background: #111; | |
| } |
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