public class MovingBall {
	double x, y ;
	double velX, velY ;
	double rad ;
	
	public MovingBall()
	{
		x = y = 0.5 ;
		velX = velY = 0.02 ;
		rad = 0.02 ;
	}
	

	public MovingBall(double inx, double iny, double inrad, double inVelX, double inVelY)
	{
		x = inx ;
		y = iny ;
		velX = inVelX ;
		velY = inVelY ;
		rad = inrad ;
	}
	
	public double getRad() { return rad;}
	
	
	
	public void UpdateLocation()
	{
		// if new x outside boundary, negate velX
		if ( ( (x + velX +rad) > 1.0) || ((x+velX-rad) < 0) )
			velX *= -1 ;
		if ( ((y + velY + rad) > 1.0) || ((y+velY -rad) < 0))
			velY *= -1 ;
		
		x += velX ;
		y += velY ;
		
	}
	
	public void Draw()
	{
		StdDraw.setPenColor(StdDraw.BLACK) ;
		StdDraw.filledCircle(x,y,rad) ;

	
	
	
	}

}