8 lines
20 KiB
JavaScript
8 lines
20 KiB
JavaScript
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/**
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* tracking - A modern approach for Computer Vision on the web.
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* @author Eduardo Lundgren <edu@rdo.io>
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* @version v1.1.2
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* @link http://trackingjs.com
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* @license BSD
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*/
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!function(t,r){t.tracking=t.tracking||{},tracking.inherits=function(t,r){function n(){}n.prototype=r.prototype,t.superClass_=r.prototype,t.prototype=new n,t.prototype.constructor=t,t.base=function(t,n){var e=Array.prototype.slice.call(arguments,2);return r.prototype[n].apply(t,e)}},tracking.initUserMedia_=function(r,n){t.navigator.getUserMedia({video:!0,audio:!(!n||!n.audio)},function(n){try{r.src=t.URL.createObjectURL(n)}catch(e){r.src=n}},function(){throw Error("Cannot capture user camera.")})},tracking.isNode=function(t){return t.nodeType||this.isWindow(t)},tracking.isWindow=function(t){return!!(t&&t.alert&&t.document)},tracking.one=function(t,r){return this.isNode(t)?t:(r||document).querySelector(t)},tracking.track=function(t,r,n){if(t=tracking.one(t),!t)throw new Error("Element not found, try a different element or selector.");if(!r)throw new Error("Tracker not specified, try `tracking.track(element, new tracking.FaceTracker())`.");switch(t.nodeName.toLowerCase()){case"canvas":return this.trackCanvas_(t,r,n);case"img":return this.trackImg_(t,r,n);case"video":return n&&n.camera&&this.initUserMedia_(t,n),this.trackVideo_(t,r,n);default:throw new Error("Element not supported, try in a canvas, img, or video.")}},tracking.trackCanvas_=function(t,r){var n=this,e=new tracking.TrackerTask(r);return e.on("run",function(){n.trackCanvasInternal_(t,r)}),e.run()},tracking.trackCanvasInternal_=function(t,r){var n=t.width,e=t.height,i=t.getContext("2d"),a=i.getImageData(0,0,n,e);r.track(a.data,n,e)},tracking.trackImg_=function(t,r){var n=t.width,e=t.height,i=document.createElement("canvas");i.width=n,i.height=e;var a=new tracking.TrackerTask(r);return a.on("run",function(){tracking.Canvas.loadImage(i,t.src,0,0,n,e,function(){tracking.trackCanvasInternal_(i,r)})}),a.run()},tracking.trackVideo_=function(r,n){var e,i,a=document.createElement("canvas"),o=a.getContext("2d"),c=function(){e=r.offsetWidth,i=r.offsetHeight,a.width=e,a.height=i};c(),r.addEventListener("resize",c);var s,g=function(){s=t.requestAnimationFrame(function(){if(r.readyState===r.HAVE_ENOUGH_DATA){try{o.drawImage(r,0,0,e,i)}catch(t){}tracking.trackCanvasInternal_(a,n)}g()})},h=new tracking.TrackerTask(n);return h.on("stop",function(){t.cancelAnimationFrame(s)}),h.on("run",function(){g()}),h.run()},t.URL||(t.URL=t.URL||t.webkitURL||t.msURL||t.oURL),navigator.getUserMedia||(navigator.getUserMedia=navigator.getUserMedia||navigator.webkitGetUserMedia||navigator.mozGetUserMedia||navigator.msGetUserMedia)}(window),function(){tracking.EventEmitter=function(){},tracking.EventEmitter.prototype.events_=null,tracking.EventEmitter.prototype.addListener=function(t,r){if("function"!=typeof r)throw new TypeError("Listener must be a function");return this.events_||(this.events_={}),this.emit("newListener",t,r),this.events_[t]||(this.events_[t]=[]),this.events_[t].push(r),this},tracking.EventEmitter.prototype.listeners=function(t){return this.events_&&this.events_[t]},tracking.EventEmitter.prototype.emit=function(t){var r=this.listeners(t);if(r){for(var n=Array.prototype.slice.call(arguments,1),e=0;e<r.length;e++)r[e]&&r[e].apply(this,n);return!0}return!1},tracking.EventEmitter.prototype.on=tracking.EventEmitter.prototype.addListener,tracking.EventEmitter.prototype.once=function(t,r){var n=this;n.on(t,function e(){n.removeListener(t,e),r.apply(this,arguments)})},tracking.EventEmitter.prototype.removeAllListeners=function(t){return this.events_?(t?delete this.events_[t]:delete this.events_,this):this},tracking.EventEmitter.prototype.removeListener=function(t,r){if("function"!=typeof r)throw new TypeError("Listener must be a function");if(!this.events_)return this;var n=this.listeners(t);if(Array.isArray(n)){var e=n.indexOf(r);if(0>e)return this;n.splice(e,1)}return this},tracking.EventEmitter.prototype.setMaxListeners=function(){throw new Error("Not implemented")}}(),function(){tracking.Canvas={},tracking.Canvas.loadImage=function(t,r,n,e,i,a,o){var c=this,s=new window.Image;s.crossOrigin="*",s.onload=function(){var r=t.getContext("2d");t.width=i,t.height=a,r.drawImage(s,n,e,i,a),o&
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