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September 1, 2015 12:30
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Web Worker Easing
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| var Box = function( num, worker ){ | |
| this.name = 'box-'+ num; | |
| // create element | |
| var el = document.createElement("div"); | |
| el.setAttribute( 'class', 'box' ); | |
| el.setAttribute( 'id', this.name ); | |
| el.style.top = parseInt(num) * 1 +"px"; | |
| document.body.appendChild(el); | |
| this.el = el; | |
| this.state.start = Date.now() || (new Date()).getTime(); | |
| if( worker ){ | |
| this.workerInit( worker ); | |
| } else { | |
| this.animate(); | |
| } | |
| } | |
| Box.prototype.options = { | |
| time: 1000, | |
| distance: window.innerWidth | |
| } | |
| Box.prototype.state = { | |
| start: Date.now() || (new Date()).getTime(), | |
| direction: 1 | |
| } | |
| Box.prototype.animate = function(){ | |
| var now = Date.now() || (new Date()).getTime(); | |
| var decimal = ((now - this.state.start) / this.options.time) || 0; | |
| var pos = easing.easeInExpo( decimal ); | |
| //this.el.style.left = ( ( ( this.state.direction > 0 ) ? pos : 1 - pos ) * this.options.distance ) +"px"; | |
| this.el.style.left = ( pos * this.options.distance ) +"px"; | |
| if( decimal >= 1 || decimal <= 0 ){ | |
| this.state.direction = -1 * this.state.direction; | |
| this.state.start = e.data.now; | |
| } | |
| requestAnimFrame(this.animate.bind(this)); | |
| } | |
| Box.prototype.workerInit = function( worker ){ | |
| var self = this; | |
| this.worker = worker; | |
| this.worker.onmessage = function(e) { | |
| // process relative callback | |
| if( e.data.name != self.name ) return; | |
| // Get fresh data from the worker | |
| pos = e.data.pos; | |
| //self.el.style.left = ( ( ( self.state.direction > 0 ) ? pos : 1 - pos ) * self.options.distance ) +"px"; | |
| self.el.style.left = ( pos * self.options.distance ) +"px"; | |
| if( e.data.decimal >= 1 || e.data.decimal <= 0 ){ | |
| self.state.direction = -1 * self.state.direction; | |
| self.state.start = e.data.now; | |
| } | |
| } | |
| // update worker | |
| this.workerUpdate(); | |
| } | |
| Box.prototype.workerUpdate = function(){ | |
| var self = this; | |
| var now = Date.now() || (new Date()).getTime(); | |
| var options = { | |
| name: this.name, | |
| now : now, | |
| start : this.state.start, | |
| time : this.options.time | |
| }; | |
| this.worker.postMessage( options ); | |
| requestAnimFrame(this.workerUpdate.bind(this)); | |
| } |
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| var boxes = []; | |
| // shim layer with setTimeout fallback | |
| window.requestAnimFrame = (function(){ | |
| return window.requestAnimationFrame || | |
| window.webkitRequestAnimationFrame || | |
| window.mozRequestAnimationFrame || | |
| function( callback ){ | |
| window.setTimeout(callback, 1000 / 60); | |
| }; | |
| })(); | |
| function init(){ | |
| var i = 0; | |
| var createBoxes = setInterval(function(){ | |
| boxes.push( new Box(i) ); | |
| i++; | |
| if( i > 1000) clearInterval(createBoxes); | |
| }, 10); | |
| } | |
| function initWorkers(){ | |
| var i = 0; | |
| // create worker | |
| // Build a worker from an anonymous function body | |
| var blobURL = URL.createObjectURL( new Blob([ '(', | |
| function(){ | |
| //Long-running work here | |
| self.onmessage = function(e) { | |
| // wait for easing lib | |
| if (typeof easing == "undefined") { | |
| importScripts("http://rawgit.com/danro/easing-js/master/easing-min.js"); | |
| } | |
| var decimal = ((e.data.now - e.data.start) / e.data.time) || 0; | |
| var pos = easing.easeInExpo(decimal); | |
| // Send data back to the main thread | |
| self.postMessage({ pos: pos, decimal: decimal, now: e.data.now, name: e.data.name }); | |
| }; | |
| }.toString(), | |
| ')()' ], { type: 'application/javascript' } ) ), | |
| worker = new Worker( blobURL ); | |
| // Won't be needing this anymore | |
| URL.revokeObjectURL( blobURL ); | |
| var createBoxes = setInterval(function(){ | |
| boxes.push( new Box(i, worker) ); | |
| i++; | |
| if( i > 100) clearInterval(createBoxes); | |
| }, 10); | |
| } |
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| <html> | |
| <head> | |
| <script type="text/javascript" src="http://rawgit.com/danro/easing-js/master/easing-min.js"></script> | |
| <script type="text/javascript" src="box.js"></script> | |
| <script type="text/javascript" src="main.js"></script> | |
| <link rel="stylesheet" href="styles.css"> | |
| </head> | |
| <body> | |
| <script type="text/javascript"> | |
| init(); | |
| </script> | |
| </body> | |
| </html> |
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| .box { | |
| position: absolute; | |
| width: 1px; | |
| height: 1px; | |
| left: 0; | |
| top: 0; | |
| background: #f00; | |
| } | |
| #time{ | |
| position: absolute; | |
| bottom: 0; | |
| } |
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| <html> | |
| <head> | |
| <script type="text/javascript" src="http://rawgit.com/danro/easing-js/master/easing-min.js"></script> | |
| <script type="text/javascript" src="box.js"></script> | |
| <script type="text/javascript" src="main.js"></script> | |
| <link rel="stylesheet" href="styles.css"> | |
| </head> | |
| <body> | |
| <script type="text/javascript"> | |
| initWorkers(); | |
| </script> | |
| </body> | |
| </html> |
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Resources:
http://stackoverflow.com/a/19201292
view-source:http://schteppe.github.io/cannon.js/examples/worker.html
http://stackoverflow.com/questions/15035473/destroying-webworkers
http://www.html5rocks.com/en/tutorials/workers/basics/