var focalLength = 500;			// environmental constant				
var centerX = Stage.width/2;	// Stage Center X
var centerY = Stage.height/2;	// Stage Center Y
var maxFrequency=5; 				// frequency at which to create clips
var itemDepth =0;				   // depth of clips
var maxLife = 450;				// lifespan of each clip	
var maxSpeed = 5;
var radius  = 20;

this.initCamera = function(){
	
	// create camera object
	this.oCamera = new Object();
	
	// Set camera Properties  									
	this.oCamera.z = focalLength;  		// target camera z position
	this.oCamera.dz = 0;		// initial camera z position					
	this.oCamera.s = maxSpeed;				// camera zoom speed
	
	// render camera
	this.onEnterFrame = function(){
		// Move Camera
		with(this.oCamera){
			dz += (z-dz)/s;					
		}
		
		// choose random number from frequency amount
		var frequency = random(maxFrequency);
		// If that number is 0 then add a new item
		// this happens randomly once in a while creating the 
		// random frequency of generated clips
		(frequency == 0) ? addClip() : null;
	}
	
}

// Add a new clip
this.addClip = function(){
	// add to depth
	itemDepth--
	// create clip and assign as variable
	var clip = this.attachMovie("item","item_mc_"+itemDepth,itemDepth);
	// set clip properties
	clip.z=0;
	clip.life= maxLife;		// give lifespan
	// make invisible on initialisation
	clip._visible=false;
	// assign render
	clip.onEnterFrame = render;
}

//render animatioon
this.render = function(){
	// make clip visible
	this._visible = true;
	// make z go towards user
	this.z-= maxSpeed;

	// Calculating actual scale values according to scale = dz/(z+dz) formula
	var scale = (this._parent.oCamera.dz + _root.scroll*15)/(focalLength+this.z);

	// Position
	this._x = (Math.sin(this.z*Math.PI/180)*scale)*radius + centerX;
	this._y = (Math.cos(this.z*Math.PI/180)*scale)*radius + centerY;
	
	// set size
	this._xscale = this._yscale = scale*100;

	// Swap depths 
	this._alpha = scale*100;

	// renmove if ni lifespan left else reduce lifespan
	(this.life ==0) ? this.removeMovieClip(): this.life--;
	
}

// Initiate	instances in Camera
initCamera();	
		
stop();


/*
________________________________________________

2006, All rights reserved
Paul Ortchanian San Francisco CA
paul@reflektions.com

This code is free; you can redistribute it and/or modify
it under the terms of the GNU General Public License as 
published by the Free Software Foundation.

________________________________________________

*/