HTML5 Canvas逼真烟雾效果js插件

<script type="text/javascript" src="js/smoke.js"></script>

<canvas id="canvas"></canvas>

var canvas = document.getElementById('canvas')
var ctx = canvas.getContext('2d')
canvas.width = 1000
canvas.height = 1000
 
var party = smokemachine(ctx, [54, 16.8, 18.2])
 
party.start() // start animating
 
party.addsmoke(500,500,10) // wow we made smoke
 
setTimeout(function(){
 
    party.stop() // stop animating
 
    party.addsmoke(600,500,100)
    party.addsmoke(500,600,20)
 
    for(var i=0;i<10;i++){
        party.step(10) // pretend 10 ms pass and rerender
    }
 
    setTimeout(function(){
        party.start()
    },1000)
 
},1000)

var party = smokemachine(context, [1,5,253])