private Snakebody Getfood()//获得食物
{
Snakebody food = null;
Random r = new Random();
bool redo = false;
while (true)
{
redo = false;
int x = r.Next(this.width);
int y = r.Next(this.height);
for (int i = 0; i < this.body.Count; i++)//检查食物所在坐标是否和贪吃蛇冲突
{
Snakebody s = (Snakebody)(this.body[i]);
if (s.Point.X == x && s.Point.Y == y) //有冲突时，在随机找一个坐标
{
redo = true;
}
}
if (redo == false)
{
food = new Snakebody(Color.Black, this.size, new Point(x, y));
break;
}
}
return(food);
}
}//设定类属性值，初始化蛇块列表ArrayList
public void Start() //开始
{
this.food = Getfood(); //生成一个食物
//初始化计时器
timerblock = new System.Timers.Timer();
timerblock.Elapsed += new System.Timers.ElapsedEventHandler(OnTimedEvent); //注册计时器的事件
timerblock.AutoReset = true; //设置是执行一次（false）还是一直执行(true)，默认为true
timerblock.Interval = 500;
timerblock.Start();
}
private bool CheckDead() //检查游戏是否结束
{
Snakebody head = (Snakebody)(this.body[0]); //取蛇块列表的第一个当作蛇头
//检查是否超出画布范围
if (head.Point.X < 0 || head.Point.Y < 0 || head.Point.X >= this.width || head.Point.Y >= this.height)
{
return(true);
}
for (int i = 1; i < this.body.Count; i++)//检查是否撞上自己
{
Snakebody s = (Snakebody)this.body[i];
if (head.Point.X == s.Point.X && head.Point.Y == s.Point.Y)
{
return(true);
}
}
return(false);
}
private void Move() //贪吃蛇移动
{
Point p; //下一个坐标位置
Snakebody head = (Snakebody)(this.body[0]);
if (this.dir == Direction.Up)
{
p = new Point(head.Point.X, head.Point.Y - 1);
}
else if (this.dir == Direction.Down)
{
p = new Point(head.Point.X, head.Point.Y + 1);
}
else if (this.dir == Direction.Left)
{
p = new Point(head.Point.X - 1, head.Point.Y);
}
else
{
p = new Point(head.Point.X + 1, head.Point.Y);
}
//生成新坐标，成为蛇头
Snakebody s = new Snakebody(Color.Red, this.size, p);
//如果下一个坐标不是当前食物坐标，那么删除最后一节蛇
if (this.food.Point != p)
{
this.body.RemoveAt(this.body.Count - 1);
}
//如果下一个坐标和食物坐标重合，那么就生成一个新食物，即“吃到食物”
else
{
this.food = this.Getfood();
}
//把下一个坐标插入到蛇块列表的第一个，使其成为蛇头
this.body.Insert(0, s);
this.Paint(this.Palette);//更新画板
}
