class Ball extends MovieClip
{
	
	// variables
	var xmov:Number;
	var ymov:Number;
	var gravity:Number = 2;
	var ylimit:Number = 350;
	var wallColorTimer:Number;
	var leftWallColor:Object;
	var rightWallColor:Object;
	var coinToss:Number;
	var i:Number;
	
	var xstart:Number;
	var ystart:Number;
	
	var timer:Number;
	
	var whichWall:String;
	//functions
	function moveBall ()
	{
		this._x += xmov;
		ymov += gravity;
		this._y += ymov;
		if (this._y >ylimit)
		{
			this._y = ylimit;
			ymov *= -1;
			xmov = xmov *.9;
		}
	}
	function collisionTest ()
	{
		
		if (this.hitTest(_root.leftWall))
		{
			xmov = -xmov; // bounce off of wall
			changeWallColor('left')
			xmovAdjust ();
		}
		
		if (this.hitTest(_root.rightWall))
		{
			xmov = -xmov; // bounce off of wall
			changeWallColor('right')
			xmovAdjust ();
		}
		
		
		
	}
	
	function changeWallColor (whichWall)  //change wall color temporarily when ball bounces off of it
	{
		if (whichWall == "left")
		{
			wallColorTimer = getTimer() +50; // sets timer for wall color change
			leftWallColor.setRGB (0x555555); //changes wall to grey
			
		}
		
		if (whichWall == "right")
		{
			wallColorTimer = getTimer() +50; // sets timer for wall color change
			rightWallColor.setRGB (0x555555); //changes wall to grey
			
		}
	}
	
	function resetWallColor ()
	{
		if (getTimer () > wallColorTimer)
		{
			leftWallColor.setRGB (0xffff00);       // resets wall color when timer has expired
			rightWallColor.setRGB (0xffff00);
		}
	}
	
	function diminishGravity ()
	{
		timer = getTimer () + 1;
		if (getTimer() < timer)
		{
			gravity += .1;
			
		}
		trace ('gravity = '+gravity);
		trace ('xmov = '+xmov);
	}
	
	function xmovAdjust ()
	{
		xmov = xmov * .95;
	}
	//frame events

	function onEnterFrame ()
	{
		
		
		moveBall ();
		collisionTest ();
		resetWallColor ();
		diminishGravity ();
		
		
	}
	
	function reset ()
	{
		gravity = 2;
		
		coinToss= Math.floor(Math.random()*2)
		if (coinToss== 0) i=1;
		if (coinToss==1) i=-1;
		
		
		xmov= (Math.floor((Math.random()*20))*i);
		ymov= Math.floor(Math.random()*20);
		
		leftWallColor = new Color (_root.leftWall);
		rightWallColor = new Color (_root.rightWall);
		
		xstart = (Math.floor(Math.random()*300)+100);
		ystart = (Math.floor(Math.random()*300));
		
		this._x= xstart;
		this._y= ystart;
		
		
	}
	
	//constructor
	
	function Ball ()
	{
		
		reset ();
		
	}
}