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我正在尝试编写一个简单的 Snake 游戏，但在吃完每一块食物后，我无法让蛇持续生长。吃掉的第一个正确添加了一个片段，但 2+ 个片段没有。

我认为问题在于每个细分市场的定位。在我的代码中，我列出了SegmentXand SegmentY，其中包含蛇在吃一块食物时的坐标，并且我在一个foreach循环中列出了新坐标。吃完第一块食物后，什么会导致失败？

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Zmijice
{
    enum SnakeControl
    {
        Right,Left,Up,Down,Stop
    }    

    public partial class Zmijice : Form
    {
        private int snakeX;
        private int snakeY;

        private int newX;
        private int newY;

        private int foodX;
        private int foodY;

        private const int height=20;
        private const int width=20;

        private List<int> SegmentX = new List<int>();
        private List<int> SegmentY = new List<int>();

        Random rnd = new Random();        

        private SnakeControl Position;

        public Zmijice()
        {           
            InitializeComponent();

            RandomFoodPosition();
            RandomSnakePosition();

            Position = SnakeControl.Stop;
        }

        public void RandomFoodPosition()
        {
            foodX = rnd.Next(1, 20) * 20;
            foodY = rnd.Next(1, 20) * 20;
        }

        public void RandomSnakePosition()
        {
            snakeX = rnd.Next(1, 20) * 20;
            snakeY = rnd.Next(1, 20) * 20;
        }

        private void Tajmer_Tick(object sender, EventArgs e)
        {
            if (Position == SnakeControl.Stop)
            {
            }

            else if (Position == SnakeControl.Right)
            {                
                snakeX += 20;
            }

            else if (Position == SnakeControl.Left)
            {
                snakeX -= 20;
            }

            else if (Position == SnakeControl.Up)
            {
                snakeY -= 20;
            }

            else if (Position == SnakeControl.Down)
            {
                snakeY += 20;
            }

            Invalidate();
        }    
        private void Zmijice_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Down)
            {
                Position = SnakeControl.Down;
            }
            else if (e.KeyCode == Keys.Up)
            {
                Position = SnakeControl.Up;
            }
            else if (e.KeyCode == Keys.Right)
            {
                Position = SnakeControl.Right;
            }
            else if (e.KeyCode == Keys.Left)
            {
                Position = SnakeControl.Left;
            }
        }
        private void Zmijice_Paint(object sender, PaintEventArgs e)
        {   
            //if snake eaten food
            //int counter = 0;
            if (snakeX==foodX && snakeY==foodY)
            {   
                //new food position
                foodX = rnd.Next(1, 20);
                foodX = foodX * 20;
                foodY = rnd.Next(1, 20);
                foodY = foodY * 20;

                //counter++;

                //grow up snake
                SegmentX.Add(snakeX);
                SegmentY.Add(snakeY);

                //movement for new snake part
                if (Position == SnakeControl.Left)
                {
                    newX = snakeX+20;
                    newY = snakeY;                                       
                }
                if (Position == SnakeControl.Right)
                {
                    newX = snakeX-20;
                    newY = snakeY;                    
                }
                if (Position == SnakeControl.Up)
                {
                    newX = snakeX;
                    newY = snakeY+20;                  
                }
                if (Position == SnakeControl.Down)
                {
                    newX = snakeX;
                    newY = snakeY-20;                    
                }
            }        

            //render snake parts
            foreach (int k in SegmentX)
            {
               foreach (int l in SegmentY)
               {
                  e.Graphics.FillRectangle(Brushes.Orange, newX, newY, width, height);
               }
            }

            //new position is equal old position
            newX = snakeX;
            newY = snakeY;               

            e.Graphics.FillRectangle(Brushes.DarkRed, snakeX, snakeY, width, height);
            e.Graphics.FillRectangle(Brushes.Aqua, foodX, foodY, width, height); 
        }      
    }
}
4

2 回答 2

3

这只会为您的蛇中的每个部分在前一个顶部绘制一个矩形：

//render snake parts
foreach (int k in SegmentX)
{
     foreach (int l in SegmentY)
     {
         e.Graphics.FillRectangle(Brushes.Orange, newX, newY, width, height);
     }
}

所以段数不会改变蛇的长度......

（除非你从 0 部分变为 1，因为 foreach 执行）

您应该使用for循环并将矩形移动到先前绘制的矩形旁边。我相信你可以很容易地弄清楚那部分。

于 2013-07-10T11:19:00.637 回答
2

也许考虑跟踪食物的食用时间。不是在吃食物时添加新片段，而是在删除旧片段时检查是否有最近吃过的食物。如果有，请重置吃过的食物标志并跳过删除该段。

没有完全重写，我看不到另一种简单的方法来挽救你所拥有的东西。

于 2013-07-10T10:39:20.170 回答