tracky-mouse/lib/OneEuroFilter.js

Add facial mouse accessibility to JavaScript applications

!function(t,e){if("object"==typeof exports&&"object"==typeof module)module.exports=e();else if("function"==typeof define&&define.amd)define([],e);else{var i=e();for(var s in i)("object"==typeof exports?exports:t)[s]=i[s]}}("undefined"!=typeof self?self:this,(()=>(()=>{"use strict";var t={d:(e,i)=>{for(var s in i)t.o(i,s)&&!t.o(e,s)&&Object.defineProperty(e,s,{enumerable:!0,get:i[s]})},o:(t,e)=>Object.prototype.hasOwnProperty.call(t,e),r:t=>{"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(t,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(t,"__esModule",{value:!0})}},e={};t.r(e),t.d(e,{LowPassFilter:()=>i,OneEuroFilter:()=>s});class i{setAlpha(t){(t<=0||t>1)&&console.log("alpha should be in (0.0., 1.0]"),this.a=t}constructor(t,e=0){this.y=this.s=e,this.setAlpha(t),this.initialized=!1}filter(t){var e;return this.initialized?e=this.a*t+(1-this.a)*this.s:(e=t,this.initialized=!0),this.y=t,this.s=e,e}filterWithAlpha(t,e){return this.setAlpha(e),this.filter(t)}hasLastRawValue(){return this.initialized}lastRawValue(){return this.y}reset(){this.initialized=!1}}class s{alpha(t){var e=1/this.freq;return 1/(1+1/(2*Math.PI*t)/e)}setFrequency(t){t<=0&&console.log("freq should be >0"),this.freq=t}setMinCutoff(t){t<=0&&console.log("mincutoff should be >0"),this.mincutoff=t}setBeta(t){this.beta_=t}setDerivateCutoff(t){t<=0&&console.log("dcutoff should be >0"),this.dcutoff=t}constructor(t,e=1,s=0,h=1){this.setFrequency(t),this.setMinCutoff(e),this.setBeta(s),this.setDerivateCutoff(h),this.x=new i(this.alpha(e)),this.dx=new i(this.alpha(h)),this.lasttime=void 0}reset(){this.x.reset(),this.dx.reset(),this.lasttime=void 0}filter(t,e=undefined){null!=this.lasttime&&null!=e&&(this.freq=1/(e-this.lasttime)),this.lasttime=e;var i=this.x.hasLastRawValue()?(t-this.x.lastRawValue())*this.freq:0,s=this.dx.filterWithAlpha(i,this.alpha(this.dcutoff)),h=this.mincutoff+this.beta_*Math.abs(s);return this.x.filterWithAlpha(t,this.alpha(h))}}return e})()));