private void createBoardImage(){
		Graphics2D g = (Graphics2D) gameBoard.getGraphics();
		g.setColor(Color.lightGray);
		g.fillRect(0, 0, BOARD_WIDTH, BOARD_HEIGHT);
		g.setColor(Color.WHITE);
		for(int row = 0; row < ROWS; row++){
			for(int col = 0; col < COLS; col++){
				int x = SPACING + SPACING * col + Tile.WIDTH * col;
				int y = SPACING + SPACING * row + Tile.HEIGHT * row;
				g.fillRoundRect(x, y, Tile.WIDTH, Tile.HEIGHT, Tile.ARC_WIDTH, Tile.ARC_HEIGHT);
			}
		}
	}