javascript - a questionabout three.js when i use trackballcontrols.js -


i try use trackballcontrols.js in project need modification,and cant understand these code ,can give me explanation？

var getmouseoncircle = ( function () {      var vector = new three.vector2();      return function getmouseoncircle( pagex, pagey ) {          vector.set(             ( ( pagex - _this.screen.width * 0.5 - _this.screen.left ) / ( _this.screen.width * 0.5 ) ),             ( ( _this.screen.height + 2 * ( _this.screen.top - pagey ) ) / _this.screen.width ) // screen.width intentional         );          return vector;      };  }() );

this code converts coordinate of mouse position normalized 2d vector (to use rotation calculation).

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