public void Move(SnakeMoveDirection newDirection)
{
// if (newDirection == SnakeMoveDirection.None)
// {
// throw new ArgumentException("Snake Move Error: directon cannot be none");
// }
SnakeMoveDirection availableDirection = GetAvailableNewDirection(newDirection);
Point newHeadNode = GetNewHeadNode(availableDirection);
AddNewHeadNode(newHeadNode);
}
/// <summary>
/// 获取有效的移动方向
/// </summary>
/// <returns></returns>
SnakeMoveDirection GetAvailableNewDirection(SnakeMoveDirection newDirection)
{
SnakeMoveDirection currentDirection = GetCurrentDirection();
if (newDirection == SnakeMoveDirection.None
|| (currentDirection == SnakeMoveDirection.Left && newDirection == SnakeMoveDirection.Right)
|| (currentDirection == SnakeMoveDirection.Right && newDirection == SnakeMoveDirection.Left)
|| (currentDirection == SnakeMoveDirection.Up && newDirection == SnakeMoveDirection.Down)
|| (currentDirection == SnakeMoveDirection.Down && newDirection == SnakeMoveDirection.Up)
)
{
return currentDirection;
}
else
{
return newDirection;
}
}
// private void panelScene_Paint(object sender, PaintEventArgs e)
// {
// _game.Draw(e.Graphics);
// }
//
// private void panelScene_Resize(object sender, EventArgs e)
// {
// _game.DisplayRectangle = panelScene.ClientRectangle;
// Invalidate();
// }
private void FormSnakeGame_KeyDown(object sender, KeyEventArgs e)
{
switch (e.KeyCode)
{
case Keys.Left:
_snakeDirection = SnakeMoveDirection.Left;
break;
case Keys.Right:
_snakeDirection = SnakeMoveDirection.Right;
break;
case Keys.Up:
_snakeDirection = SnakeMoveDirection.Up;
break;
case Keys.Down:
_snakeDirection = SnakeMoveDirection.Down;
break;
}
}
/// <summary>
/// 依据移动方向，获取新的头部节点
/// </summary>
/// <param name="direction"></param>
/// <returns></returns>
Point GetNewHeadNode(SnakeMoveDirection direction)
{
Point firstNode = BodyNodes.First();
int x = firstNode.X;
int y = firstNode.Y;
switch (direction)
{
case SnakeMoveDirection.Left:
--x;
break;
case SnakeMoveDirection.Right:
++x;
break;
case SnakeMoveDirection.Up:
--y;
break;
case SnakeMoveDirection.Down:
++y;
break;
}
return new Point(x, y);
}
public void SnakeMove(SnakeMoveDirection direction)
{
_snake.Move(direction);
}