public Snake(Vector2 _origin, Point position, Texture2D _head, Texture2D _straightBody, Texture2D _cornerBody, Texture2D _tail)
{
origin = _origin;
headImage = _head;
straightBodyImage = _straightBody;
cornerBodyImage = _cornerBody;
tailImage = _tail;
Point pos = position;
head = new SnakeHead(headImage, origin, pos, Direction.Up);
body = new List<SnakeBody>();
pos.Y++;
body.Add(new SnakeBody(straightBodyImage, origin, pos, Direction.Up, Direction.Up));
pos.Y++;
tail = new SnakeTail(tailImage, origin, pos, Direction.Up);
}
//蛇的最短长度为3
public Snake(Vector2 _origin, Point position, Texture2D _head, Texture2D _straightBody, Texture2D _cornerBody, Texture2D _tail, Direction _direction, int length)
{
origin = _origin;
headImage = _head;
straightBodyImage = _straightBody;
cornerBodyImage = _cornerBody;
tailImage = _tail;
Point pos = position;
if (length < 3)
length = 3;
int x, y;
switch (_direction)
{
case Direction.Up:
x = 0;
y = -1;
break;
case Direction.Down:
x = 0;
y = 1;
break;
case Direction.Left:
x = -1;
y = 0;
break;
case Direction.Right:
x = 1;
y = 0;
break;
default:
x = 0;
y = 0;
break;
}
head = new SnakeHead(headImage, origin, pos, _direction);
body = new List<SnakeBody>();
for (int i = 0; i < length - 2; i++)
{
pos.X += x;
pos.Y += y;
body.Add(new SnakeBody(straightBodyImage,origin,pos,_direction,_direction));
}
pos.X += x;
pos.Y += y;
tail = new SnakeTail();
}