var focalLength = 1000;			// environmental constant				
var centerX = Stage.width/2;	// Stage Center X
var centerY = Stage.height/2;	// Stage Center Y
var maxFrequency=15; 				// frequency at which to create clips
var itemDepth =0;				   // depth of clips
var maxLife = 250;				// lifespan of each clip	
var radius  = 60;

this.initCamera = function(){
	// creat lines
	this.createEmptyMovieClip("canvas_mc", 1);
	//center
	this.canvas_mc.moveTo(centerX,centerY);
	// 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 = 20;				// 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.createEmptyMovieClip("item_mc_"+itemDepth, itemDepth);

	// set clip properties
	clip.z=random(focalLength);
	clip.zr=0;
	clip.hr=0;
	clip.vr=0;
	clip.life= random(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;
	
	// item moves up on z axis
	this.zr = Math.atan(this.z*Math.PI/180);
	this.hr+= this.zr*random(12);
	this.vr+= this.zr*random(3);
	
	// 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.hr*Math.PI/180)*scale)*radius + centerX;
	this._y = (Math.cos(this.vr*Math.PI/180)*scale)*radius + centerY;

	// set clip color
	var c = getRandomColor();
	this._parent.canvas_mc.lineStyle(1, (c.r | c.g | c.b ),50);
	this._parent.canvas_mc.lineTo(this._x,this._y);
			
	// set size
	this._xscale = this._yscale = scale*100;

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

	// renmove if ni lifespan left else reduce lifespan
	this.life--;
	
	if(this.life ==0)  {
		this._parent.removeMovieCLip(this);
		this._visible = false;
		this.onEnterFrame = null;
		this._parent.canvas_mc.clear();
		this._parent.canvas_mc.moveTo(this._x,this._y);
	}

}

// Get random colors and apply to clip
this.getRandomColor = function (clip) {
 	 r = Math.floor(Math.random()*255)<< 16;
    g = Math.floor(Math.random()*255)<< 8;
    b = Math.floor(Math.random()*255)<< 1;
	// return object with rbg values
    return {r:r,g:g,b:b};
}
// 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.

________________________________________________

*/