const	 	CLOCKTICK 	= 100;					// speed of run - move things every n milliseconds
const		MAXSTEPS 	= 1000;					// length of a run before final score
 
 const  SCREENSHOT_STEP = 50;    
 
 
//---- global constants: -------------------------------------------------------
const gridsize = 30;						// number of squares along side of world	   
const NOBOXES =  Math.trunc ( (gridsize * gridsize) / 10 );
		// density of maze - number of internal boxes
		// (bug) use trunc or can get a non-integer 

const squaresize = 100;					// size of square in pixels
const MAXPOS = gridsize * squaresize;		// length of one side in pixels 
	
const SKYCOLOR 	= 0xF0B27A  ;				// a number, not a string 
const BLANKCOLOR 	= SKYCOLOR ;			// make objects this color until texture arrives (from asynchronous file read)
const LIGHTCOLOR 	= 0xffffff ;

const show3d = true;						// Switch between 3d and 2d view (both using Three.js) 
 
const startRadiusConst	 	= MAXPOS * 0.8 ;		// distance from centre to start the camera at
const skyboxConst			= MAXPOS * 3 ;		// where to put skybox  
const maxRadiusConst 		= MAXPOS * 10  ;      // maximum distance from camera we will render things 

function World() { 

var BOXHEIGHT;		// 3d or 2d box height 
var GRID 	= new Array(gridsize);			// can query GRID about whether squares are occupied, will in fact be initialised as a 2D array   
var WALLS 	= new Array ( 4 * gridsize );		// need to keep handles to wall and maze objects so can find them later to paint them 
var MAZE 	= new Array ( NOBOXES );
var theagent, theenemy;                //People moving. User is the agent
var flag;                             //Aim of the game is to get as many flags as possible before being caught.

//position on squares
var ei, ej, ai, aj;   //enemy and agent
var fi, fj;          //flag

var badsteps;
var goodsteps;
var step;
var flags;  //keeps track of how many flags you find.
var self = this;						// needed for private fn to call public fn - see below  
}

function initSkybox() 
{
  var materialArray = [
 	( new THREE.MeshBasicMaterial ( { map: THREE.ImageUtils.loadTexture( "/uploads/dg/corna_ft.png" ), side: THREE.BackSide } ) ),
 	( new THREE.MeshBasicMaterial ( { map: THREE.ImageUtils.loadTexture( "/uploads/dg/corona_bk.png" ), side: THREE.BackSide } ) ),
 	( new THREE.MeshBasicMaterial ( { map: THREE.ImageUtils.loadTexture( "/uploads/dg/corona_up.png" ), side: THREE.BackSide } ) ),
 	( new THREE.MeshBasicMaterial ( { map: THREE.ImageUtils.loadTexture( "/uploads/dg/corona_dn.png" ), side: THREE.BackSide } ) ),
 	( new THREE.MeshBasicMaterial ( { map: THREE.ImageUtils.loadTexture( "/uploads/dg/corona_rt.png" ), side: THREE.BackSide } ) ),
 	( new THREE.MeshBasicMaterial ( { map: THREE.ImageUtils.loadTexture( "/uploads/dg/corona_lf.png" ), side: THREE.BackSide } ) )
 	];

  var skyGeometry = new THREE.CubeGeometry ( skyboxConst, skyboxConst, skyboxConst );	
  var skyMaterial = new THREE.MeshFaceMaterial ( materialArray );
  var theskybox = new THREE.Mesh ( skyGeometry, skyMaterial );
  threeworld.scene.add( theskybox );						// We are inside a giant cube
}