jparticles/production/snow.js

A succinct, efficient, and lightweight Canvas plugin library for building some cool particle effects.

+function(){"use strict";function e(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function t(e,t){if(!e)throw new ReferenceError("this hasn't been initialised - super() hasn't been called");return!t||"object"!=typeof t&&"function"!=typeof t?e:t}function n(e,t){if("function"!=typeof t&&null!==t)throw new TypeError("Super expression must either be null or a function, not "+typeof t);e.prototype=Object.create(t&&t.prototype,{constructor:{value:e,enumerable:!1,writable:!0,configurable:!0}}),t&&(Object.setPrototypeOf?Object.setPrototypeOf(e,t):e.__proto__=t)}var o=function(){function e(e,t){for(var n=0;n<t.length;n++){var o=t[n];o.enumerable=o.enumerable||!1,o.configurable=!0,"value"in o&&(o.writable=!0),Object.defineProperty(e,o.key,o)}}return function(t,n,o){return n&&e(t.prototype,n),o&&e(t,o),t}}(),r=JParticles,i=r.utils,a=r.Base,s=Math.random,c=Math.abs,u=Math.PI,l=2*u,f=i.pInt,h=i.limitRandom,p=i.calcSpeed,y=i.defineReadOnlyProperty,v=function(r){function i(n,o){return e(this,i),t(this,(i.__proto__||Object.getPrototypeOf(i)).call(this,i,n,o))}return n(i,r),o(i,[{key:"version",get:function(){return"2.0.0"}}]),o(i,[{key:"init",value:function(){this.dots=[],this.createDots(),this.draw()}},{key:"snowShape",value:function(){var e=this.set,t=e.maxR,n=e.minR,o=e.maxSpeed,r=e.minSpeed,i=h(t,n);return{r:i,x:s()*this.cw,y:-i,vx:p(o,r),vy:c(i*p(o,r)),color:this.color()}}},{key:"createDots",value:function(){for(var e=f(6*s());e--;)this.dots.push(this.snowShape())}},{key:"draw",value:function(){var e=this,t=this.cxt,n=this.cw,o=this.ch,r=this.paused,i=this.set.opacity;t.clearRect(0,0,n,o),t.globalAlpha=i,this.dots.forEach(function(i,a,c){var u=i.x,f=i.y,h=i.r;t.save(),t.beginPath(),t.arc(u,f,h,0,l),t.fillStyle=i.color,t.fill(),t.restore(),r||(i.x+=i.vx,i.y+=i.vy,s()>.99&&s()>.5&&(i.vx*=-1),u<0||u-h>n?c.splice(a,1,e.snowShape()):f-h>o&&c.splice(a,1))}),!r&&s()>.9&&this.createDots(),this.requestAnimationFrame()}}]),i}(a);v.defaultConfig={color:"#fff",maxR:6.5,minR:.4,maxSpeed:.6,minSpeed:.1},y(v,"snow")}();