CameraSwitch_FadeOut.js

const Scene = require('Scene');
const Diagnostics = require('Diagnostics');
const Instruction = require('Instruction');
const CameraInfo = require('CameraInfo');
const Time = require('Time');


var instructionTimeloss;

function setInstruction(time, token){
    if(instructionTimeloss != null){
		Time.clearTimeout(instructionTimeloss);
    }
    Instruction.bind(true, token);
	if(time != null){
 	instructionTimeloss = Time.setTimeout(
		function(){
			Instruction.bind(false, token);
		}, time);
 	}
}
function clearInstruction(){
	if(instructionTimeloss != null){
		Time.clearTimeout(instructionTimeloss);
	}
	Instruction.bind(false, '');
}

var cameraSwitched = false;

CameraInfo.captureDevicePosition.monitor({fireOnInitialValue: true}).subscribe( 
    function(pos){
		switch(pos.newValue) {

			case 'FRONT':
				Diagnostics.log('front!');
				setInstruction(3000, 'open_your_mouth');
				break;

			case 'BACK':
				Diagnostics.log('back!');
		 		cameraSwitched = true;
				setInstruction(3000, 'flip_camera');
				break;
		}	
  });