#region Input and Keyboard Events

        /// <summary>
        /// Handle player movement on screen, as well as some extra collision detection.
        /// </summary>
        public void HandleMovement()
        {
            if (isWKeyDown)
            {
                player.Move(Direction.NORTH);
            }
            if (isSKeyDown)
            {
                player.Move(Direction.SOUTH);
            }
            if (isAKeyDown)
            {
                player.Move(Direction.WEST);
            }
            if (isDKeyDown)
            {
                player.Move(Direction.EAST);
            }

            // Check for wall collision in player input.
            if (playerRectangle.IntersectsWith(winRectangle))
            {
                var dialog = MessageBox.Show("Congratulations! You have won! Play again?", TITLE, MessageBoxButtons.YesNo);
                if (dialog == DialogResult.Yes)
                {
                    // restart the game here.
                }
                else if (dialog == DialogResult.No)
                {
                    isRunning = false;
                    Application.Exit();
                }
            }
        }

        protected override void OnKeyDown(KeyEventArgs e)
        {
            base.OnKeyDown(e);
            switch (e.KeyCode)
            {
                case (Keys.W):
                    isWKeyDown = true;
                    break;
                case (Keys.S):
                    isSKeyDown = true;
                    break;
                case (Keys.A):
                    isAKeyDown = true;
                    break;
                case (Keys.D):
                    isDKeyDown = true;
                    break;
            }
        }