C# sample code analysis to implement the Snake game

This article mainly analyzes the implementation code of the C# Snake game. It has a certain reference value. Interested friends can refer to it

Today’s Boring Burst I wanted to make a greedy snake. Although there are many such things on the Internet, I think it’s okay to write it myself

snake analysis

Game rules:

1. The starting length of the snake is 5, and each food eaten increases by 1, with a maximum of 15 to pass the level

2. The snake is represented by blue , use green for food, and use black for obstacles

3. When the snake touches itself, a wall, or an obstacle, the game will fail

4. The direction keys control the movement direction of the snake, and the snake cannot move in the opposite direction. Movement, if you are moving upward, you cannot go down immediately, you can only move left, right, and up

5. The speed increases every time you pass a level

General idea:

1. Map is represented in the form of a grid. The snake is composed of squares and is saved in list

2. The square is mentioned in 1. The contents saved in the square include color, coordinates, whether it can pass, and whether it is food

3. Move forward once and add the previous square to the snake list. Remove the last one from the list. If the front grid is food, the last one will not be removed.

4. Use whiledeathloop to do the entire move

5. The space bar is an accelerator key. Acceleration is achieved by modifying the while loopsleep time.

includes 3 classes and a main form, namely Node (used to represent Square), Map (used to represent the map), Serpent (used to represent the snake), and another main form. Paste the codes in sequence below. Basically each method has comments

Code 1:

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;

namespace EngorgeSerpent
{
 /// <summary>
 /// 节点
 /// </summary>
 class Node
 {
 #region 字段
 private int x;
 private int y;
 private int width = 10;
 private bool isFood = false;
 private bool isPass = true;//是否可通过
 private Color bgColor = Color.FromArgb(224, 224, 224);
 private Color foodColor = Color.Green;
 private Color hinderColor = Color.Black;
 private Color thisColor;
 private Color serpentColor = Color.Chocolate;

 #endregion
 /// <summary>
 /// 设置食物参数
 /// </summary>
 /// <param name="_isFood"></param>
 public void SetFood(bool _isFood)
 {
  IsFood = _isFood;
  if (_isFood)
  {
  ThisColor = FoodColor;

  }
  else
  {
  ThisColor = BgColor;
  }
 }

 /// <summary>
 /// 设置障碍物参数
 /// </summary>
 /// <param name="_isHinder">是否为障碍物</param>
 public void SetHinder(bool _isHinder)
 {
  IsPass =! _isHinder;
  if (_isHinder)
  {
  ThisColor = HinderColor;
  }
  else
  {
  ThisColor = BgColor;
  }
 }

 /// <summary>
 /// 设置蛇颜色
 /// </summary>
 /// <param name="_isSerpent"></param>
 public void SetSerpent(bool _isSerpent)
 {
  IsPass = !_isSerpent;
  if (_isSerpent)
  {
  ThisColor = SerpentColor;
  }
  else
  {
  ThisColor = BgColor;
  }
 }
 #region 构造函数
 public Node()
 {
  thisColor = bgColor;
 }

 /// <summary>
 /// 有参构造方法
 /// </summary>
 /// <param name="_x">相对x坐标</param>
 /// <param name="_y">相对y坐标</param>
 /// <param name="_width">边长</param>
 /// <param name="_isFood">是否是食物</param>
 /// <param name="_isPass">是否可通过</param>
 public Node(int _x, int _y, int _width, bool _isFood, bool _isPass)
 {
  thisColor = bgColor;
  X = _x;
  Y = _y;
  Width = _width;
  IsFood = _isFood;
  IsPass = _isPass;
 }

 /// <summary>
 /// 有参构造方法
 /// </summary>
 /// <param name="_x">相对x坐标</param>
 /// <param name="_y">相对y坐标</param>
 /// <param name="_width">边长</param>
 public Node(int _x, int _y, int _width)
 {
  X = _x;
  Y = _y;
  Width = _width;
 }

 /// <summary>
 /// 有参构造方法
 /// </summary>
 /// <param name="_x">相对x坐标</param>
 /// <param name="_y">相对y坐标</param>
 public Node(int _x, int _y)
 {
  X = _x;
  Y = _y;
 }
 #endregion

 #region 属性
 /// <summary>
 /// 蛇颜色
 /// </summary>
 public Color SerpentColor
 {
  get { return serpentColor; }
 }

 /// <summary>
 /// 背景色
 /// </summary>
 public Color BgColor
 {
  get { return bgColor; }
 }

 /// <summary>
 /// 食物颜色
 /// </summary>
 public Color FoodColor
 {
  get { return foodColor; }
 }

 /// <summary>
 /// 障碍物颜色
 /// </summary>
 public Color HinderColor
 {
  get { return hinderColor; }
 }

 /// <summary>
 /// 当前颜色
 /// </summary>
 public Color ThisColor
 {
  get { return thisColor; }
  set { thisColor = value; }
 }

 /// <summary>
 /// 获取或设置相对横坐标
 /// </summary>
 public int X
 {
  get { return x; }
  set { x = value; }
 }

 /// <summary>
 /// 获取或设置相对纵坐标
 /// </summary>
 public int Y
 {
  get { return y; }
  set { y = value; }
 }

 /// <summary>
 /// 获取或设置节点边长
 /// </summary>
 public int Width
 {
  get { return width; }
  set { width = value; }
 }

 /// <summary>
 /// 获取或设置是否为食物
 /// </summary>
 public bool IsFood
 {
  get { return isFood; }
  set { isFood = value; }
 }

 /// <summary>
 /// 获取或设置是否可以通过
 /// </summary>
 public bool IsPass
 {
  get { return isPass; }
  set { isPass = value; }
 }
 #endregion
 }
}

Code 2:

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;

namespace EngorgeSerpent
{
 /// <summary>
 /// 地图
 /// </summary>
 class Map
 {
 /// <summary>
 /// 节点数组
 /// </summary>
 private List<List<Node>> _nodes;
 private int RowCount;
 private int ComsCount;
 private Color bgColor = Color.FromArgb(224, 224, 224);
 private System.Windows.Forms.Control MapPanel;
 Graphics g;
 /// <summary>
 /// 地图背景色 和node中背景色一致
 /// </summary>
 public Color BgColor
 {
  get { return bgColor; }
 }
 /// <summary>
 /// 构造方法
 /// </summary>
 /// <param name="rows">行数</param>
 /// <param name="coms">列数</param>
 public Map(int rows, int coms, System.Windows.Forms.Control c)
 {
  RowCount = rows;
  ComsCount = coms;
  MapPanel = c;
  g = c.CreateGraphics();
  _nodes = new List<List<Node>>();
  for (int i = 0; i < rows; i++)//行
  {
  List<Node> index = new List<Node>();
  for (int j = 0; j < coms; j++)
  {
   Node node = new Node(j, i);
   index.Add(node);
  }
  _nodes.Add(index);
  }
 }

 /// <summary>
 /// 构造方法
 /// </summary>
 /// <param name="rows">行数</param>
 /// <param name="coms">列数</param>
 /// <param name="width">节点宽度</param> 
 public Map(int rows, int coms, int width, System.Windows.Forms.Control c)
 {
  RowCount = rows;
  ComsCount = coms;
  MapPanel = c;
  g = c.CreateGraphics();
  _nodes = new List<List<Node>>();
  for (int i = 0; i < coms; i++)//行
  {
  List<Node> index = new List<Node>();
  for (int j = 0; j < rows; j++)
  {
   Node node = new Node(j, i, width);
   index.Add(node);
  }
  _nodes.Add(index);
  }
 }

 /// <summary>
 /// 重新加载地图
 /// </summary>
 public void ResetMap()
 {
  for (int i = 0; i < ComsCount; i++)//行
  {
  for (int j = 0; j < RowCount; j++)
  {
   Node node = GetNode(i, j);
   node.IsPass = true;
   node.IsFood = false;  
  }
  }
 }
 /// <summary>
 /// 获得节点
 /// </summary>
 /// <param name="x"></param>
 /// <param name="y"></param>
 /// <returns></returns>
 public Node GetNode(int x, int y)
 {
  return _nodes[y][x];
 }

 /// <summary>
 /// 设置食物
 /// </summary>
 public void SetFood()
 {
  SolidBrush brush = null;
  int _x, _y;
  Random r = new Random();
  while (true)
  {
  _x = r.Next(0, RowCount);
  _y = r.Next(0, ComsCount);
  if (_nodes[_x][_y].IsPass)
  {
   break;
  }
  }
  Node nodeindex = _nodes[_x][_y];
  nodeindex.SetFood(true);
  brush = new SolidBrush(nodeindex.FoodColor);
  RectangleF[] rects = { new RectangleF(nodeindex.X * nodeindex.Width, nodeindex.Y * nodeindex.Width, nodeindex.Width, nodeindex.Width) };
  g.FillRectangles(brush, rects);
 }

 /// <summary>
 /// 设置障碍物
 /// </summary>
 /// <param name="list"></param>
 public void SetHinder(List<Node> list)
 {
  SolidBrush brush = null;
  RectangleF[] rects = new RectangleF[list.Count];
  for (int i = 0; i < list.Count; i++)
  {
  Node _node = list[i];
  _node.SetHinder(true);
  _node.IsPass = false;
  if (brush == null)
  {
   brush = new SolidBrush(_node.HinderColor);
  }
  RectangleF r = new RectangleF(_node.X * _node.Width, _node.Y * _node.Width, _node.Width, _node.Width);
  rects[i] = r;
  }
  g.FillRectangles(brush, rects);
 }

 /// <summary>
 /// 设置边界
 /// </summary>
 public void SetBorder()
 {
  //通过计算得出边界的个数是2（x+y-2）个方格

  SolidBrush brush = null;
  int borders = 2 * (ComsCount + RowCount - 2);
  RectangleF[] rects = new RectangleF[borders];
  int indexcount = 0;
  //添加顶部方格进rects列表中
  for (int i = 0; i < RowCount; i++)
  {
  Node _node = _nodes[i][0];
  _node.SetHinder(true);
  if (brush == null)
  {
   brush = new SolidBrush(_node.HinderColor);
  }
  RectangleF r = new RectangleF(_node.X * _node.Width, _node.Y * _node.Width, _node.Width, _node.Width);
  rects[indexcount] = r;
  indexcount++;
  }
  //添加底部方格进rects列表中
  for (int i = 0; i < RowCount; i++)
  {
  Node _node = _nodes[i][ComsCount - 1];
  _node.SetHinder(true);

  RectangleF r = new RectangleF(_node.X * _node.Width, _node.Y * _node.Width, _node.Width, _node.Width);
  rects[indexcount] = r;
  indexcount++;
  }
  //添加左侧方格进列表，因为左侧最上面以及最下面的两个方格已经添加进去，这里不需要重复添加
  for (int i = 1; i < ComsCount - 1; i++)
  {
  Node _node = _nodes[0][i];
  _node.SetHinder(true);
  RectangleF r = new RectangleF(_node.X * _node.Width, _node.Y * _node.Width, _node.Width, _node.Width);
  rects[indexcount] = r;
  indexcount++;
  }
  //添加右侧方格进列表，因为右侧最上面以及最下面两个方格已经添加进去，这里不需要重复添加
  for (int i = 1; i < ComsCount - 1; i++)
  {
  Node _node = _nodes[RowCount - 1][i];
  _node.SetHinder(true);
  RectangleF r = new RectangleF(_node.X * _node.Width, _node.Y * _node.Width, _node.Width, _node.Width);
  rects[indexcount] = r;
  indexcount++;
  }
  g.FillRectangles(brush, rects);
 }
 }
}

Code 3:

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;

namespace EngorgeSerpent
{
 /// <summary>
 /// 蛇
 /// </summary>
 class Serpent
 {
 private List<Node> serpentList = new List<Node>();
 private Direction direction = Direction.Right;//运动方向
 private int maxCount = 15;
 private int minCount = 5;
 private System.Windows.Forms.Control MapPanel;
 Graphics g;
 /// <summary>
 /// 设置蛇长度数据
 /// </summary>
 /// <param name="maxLength">最大长度</param>
 /// <param name="minLength">最小长度</param>
 public Serpent(int maxLength, int minLength, System.Windows.Forms.Control c)
 {
  maxCount = maxLength;
  minCount = minLength;
  MapPanel = c;
  g = MapPanel.CreateGraphics();
 }

 /// <summary>
 /// 初始化蛇
 /// </summary>
 public void InitializeSerpent()
 {
  SolidBrush brush = null;
  RectangleF[] rects = new RectangleF[minCount];
  for (int i = 1; i < minCount; i++)
  {
  Node indexnode = new Node(i, 1);
  indexnode.SetSerpent(true);//设置蛇颜色
  serpentList.Insert(0, indexnode);
  if (brush == null)
  {
   brush = new SolidBrush(indexnode.SerpentColor);
  }
  rects[i] = new RectangleF(indexnode.X * indexnode.Width, indexnode.Y * indexnode.Width, indexnode.Width, indexnode.Width);
  }
  g.FillRectangles(brush, rects);
 }



 /// <summary>
 /// 插入一个
 /// </summary>
 /// <param name="node"></param>
 public void InsertNode(Node node)
 {
  serpentList.Insert(0, node);
  node.SetSerpent(true);
  SolidBrush brush = new SolidBrush(node.SerpentColor);
  RectangleF rect = new RectangleF(node.X * node.Width, node.Y * node.Width, node.Width, node.Width);
  g.FillRectangle(brush, rect);
 }

 /// <summary>
 /// 移除尾巴
 /// </summary>
 /// <param name="node"></param>
 public void RemoveNode()
 {
  Node node = serpentList[serpentList.Count - 1];
  serpentList.Remove(node);
  node.SetSerpent(false);
  SolidBrush brush = new SolidBrush(node.BgColor);
  RectangleF rect = new RectangleF(node.X * node.Width, node.Y * node.Width, node.Width, node.Width);
  g.FillRectangle(brush, rect);
 }

 /// <summary>
 /// 获取蛇头
 /// </summary>
 /// <returns>蛇头方格</returns>
 public Node GetSerpentHead()
 {
  return serpentList[0];
 }

 /// <summary>
 /// 蛇是否最长
 /// </summary>
 /// <returns></returns>
 public bool IsMax()
 {
  if (serpentList.Count == maxCount)
  return true;
  else
  return false;
 }

 /// <summary>
 /// 蛇运动方向
 /// </summary>
 public Direction Direction
 {
  get { return direction; }
  set { direction = value; }
 }

 }
 /// <summary>
 /// 运动方向
 /// </summary>
 public enum Direction
 {
 Left,
 Up,
 Right,
 Down
 }
}

Code 4:

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

namespace EngorgeSerpent
{
 public partial class MainForm : Form
 {
 public MainForm()
 {
  InitializeComponent();

 }
 List<List<Node>> maplist = new List<List<Node>>();
 Map map;
 Serpent serpent;
 Graphics g;
 int level = 1;
 /// <summary>
 /// 运行线程
 /// </summary>
 Thread Work_Thread = null;
 /// <summary>
 /// 运行线程监控值
 /// </summary>
 bool IsWork = false;
 int sleepTime = 1000;
 int thissleeptime;

 private void MainForm_Load(object sender, EventArgs e)
 {
  g = this.panel1.CreateGraphics();
  map = new Map(40, 30, this.panel1);//这里可以对画布进行下大小设置 此处偷懒省略 
  LoadMapList();//加载障碍物列表  
 }

 /// <summary>
 /// 默认将地图设置为30*40
 /// </summary>
 private void SetMap()
 {
  map.ResetMap();
  g.Clear(map.BgColor);
  map.SetBorder();//设置边界
  List<Node> hiderList = GetHider();//获取障碍物列表
  map.SetHinder(hiderList);//设置障碍物
  SetSerpent();//初始化蛇 
 }

 /// <summary>
 /// 设置蛇
 /// </summary>
 private void SetSerpent()
 {
  serpent = new Serpent(15, 5, this.panel1);
  serpent.InitializeSerpent();//初始化蛇
 }

 /// <summary>
 /// 获取地图障碍物列表 以增加不同级别难度
 /// </summary>
 private void LoadMapList()
 {
  //目前分为5个级别
  //第一级别
  List<Node> hiderList1 = new List<Node>();
  for (int i = 15; i < 25; i++)
  {
  hiderList1.Add(map.GetNode(i, 15));
  hiderList1.Add(map.GetNode(15, i));
  }
  maplist.Add(hiderList1);

  //第二级别
  List<Node> hiderList2 = new List<Node>();
  for (int i = 7; i < 25; i++)
  {
  hiderList2.Add(map.GetNode(i, 15));
  hiderList2.Add(map.GetNode(15, i));
  }
  maplist.Add(hiderList2);

  //第三级别
  List<Node> hiderList3 = new List<Node>();
  for (int i = 7; i < 25; i++)
  {
  hiderList3.Add(map.GetNode(i, 15));
  hiderList3.Add(map.GetNode(15, i));
  hiderList3.Add(map.GetNode(i, 25));
  }
  maplist.Add(hiderList3);

  //第四级别
  List<Node> hiderList4 = new List<Node>();
  for (int i = 7; i < 25; i++)
  {
  hiderList4.Add(map.GetNode(i, 25));
  hiderList4.Add(map.GetNode(i, 15));
  hiderList4.Add(map.GetNode(15, i));
  hiderList4.Add(map.GetNode(i, 7));
  }
  maplist.Add(hiderList4);

  //第五级别
  List<Node> hiderList5 = new List<Node>();
  for (int i = 7; i < 25; i++)
  {
  hiderList5.Add(map.GetNode(i, 25));
  hiderList5.Add(map.GetNode(i, 15));
  hiderList5.Add(map.GetNode(15, i));
  hiderList5.Add(map.GetNode(i, 7));
  hiderList5.Add(map.GetNode(i, 35));
  }
  for (int i = 12; i < 20; i++)
  {
  hiderList5.Add(map.GetNode(7, i));
  hiderList5.Add(map.GetNode(25, i));
  }
  maplist.Add(hiderList5);
 }

 /// <summary>
 /// 获取障碍物列表
 /// </summary>
 /// <returns></returns>
 private List<Node> GetHider()
 {
  //这里可以添加多个地图，当级别改变时需要重新加载
  return maplist[level - 1];
 }

 /// <summary>
 /// 重置地图
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 private void btnResetMap_Click(object sender, EventArgs e)
 {
  IsWork = false;
  btnStop.Enabled = false;
  button3.Enabled = false;
  button2.Enabled = true;
  //map.ResetMap();
  SetMap();
 }

 /// <summary>
 /// 运行
 /// </summary>
 private void Work()
 {
  map.SetFood();//设置食物
  while (IsWork)
  {
  Node node_index;
  Node serpentHead = serpent.GetSerpentHead();
  switch (serpent.Direction)
  {
   case Direction.Left:
   node_index = map.GetNode(serpentHead.X - 1, serpentHead.Y);
   break;
   case Direction.Right:
   node_index = map.GetNode(serpentHead.X + 1, serpentHead.Y);
   break;
   case Direction.Up:
   node_index = map.GetNode(serpentHead.X, serpentHead.Y - 1); break;
   default:
   node_index = map.GetNode(serpentHead.X, serpentHead.Y + 1);
   break;
  }
  SerpentState index_move = SerpentMove(node_index);
  if (index_move == SerpentState.Error)//游戏结束
  {
   IsWork = false;
   //map.ResetMap();
   MessageBox.Show("游戏结束！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
   sleepTime = 1000;
   level = 1;
   thissleeptime = sleepTime;
   lblLevel.BeginInvoke(new MethodInvoker(delegate()
   {
   btnStop.Enabled = false;
   button3.Enabled = false;
   button2.Enabled = true;
   lblLevel.Text = "1";
   lblCount.Text = "5";
   }));
  }
  else if (index_move == SerpentState.NextLevel)
  {
   IsWork = false;
   this.lblCount.BeginInvoke(new MethodInvoker(delegate()
   {
   level += 1;
   lblLevel.Text = level.ToString();
   lblCount.Text = "5";
   }));
   sleepTime = sleepTime / 2;
   thissleeptime = sleepTime;
   SetMap();//重置地图
  }
  else
  {

   Thread.Sleep(thissleeptime);
  }
  }
  map.ResetMap();
 }

 /// <summary>
 /// 开始
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 private void button2_Click(object sender, EventArgs e)
 {
  IsWork = false;
  btnStop.Enabled = false;
  button3.Enabled = false;
  button2.Enabled = true;
  //map.ResetMap();
  SetMap();
  thissleeptime = sleepTime;
  this.panel1.Focus();
  IsWork = true;
  this.btnStop.Enabled = true;
  this.button3.Enabled = true;
  button2.Enabled = false;
  Work_Thread = new Thread(new ThreadStart(Work));
  Work_Thread.IsBackground = true;
  Work_Thread.Start();
 }

 private void MainForm_KeyDown(object sender, KeyEventArgs e)
 {

  if (e.KeyCode == Keys.Right)
  {
  if (serpent.Direction != Direction.Left)
   serpent.Direction = Direction.Right;
  }
  else if (e.KeyCode == Keys.Left)
  {
  if (serpent.Direction != Direction.Right)
   serpent.Direction = Direction.Left;
  }
  else if (e.KeyCode == Keys.Up)
  {
  if (serpent.Direction != Direction.Down)
   serpent.Direction = Direction.Up;
  }
  else if (e.KeyCode == Keys.Down)
  {
  if (serpent.Direction != Direction.Up)
   serpent.Direction = Direction.Down;
  }
  else if (e.KeyCode == Keys.Space)
  {
  thissleeptime = sleepTime / 2;
  }
  else if (e.KeyCode == Keys.Escape)
  {
  if (IsWork)
  {
   this.button3.Text = "继续";
   IsWork = false;
  }

  }
 }

 /// <summary>
 /// 暂停
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 private void button3_Click(object sender, EventArgs e)
 {
  if (!IsWork)
  {
  this.button3.Text = "暂停";
  IsWork = true;
  Work_Thread = new Thread(new ThreadStart(Work));
  Work_Thread.IsBackground = true;
  Work_Thread.Start();
  }
  else
  {
  this.button3.Text = "继续";
  IsWork = false;
  }
 }
 /// <summary>
 /// 退出
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 private void button4_Click(object sender, EventArgs e)
 {
  this.Close();
 }

 private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
 {
  IsWork = false;
  Application.Exit();
  System.Diagnostics.Process.GetCurrentProcess().Kill();
 }



 private void btnStop_Click(object sender, EventArgs e)
 {
  // map.ResetMap();
  btnStop.Enabled = false;
  button3.Enabled = false;
  button2.Enabled = true;
  IsWork = false;
  Work_Thread.Abort();
  SetMap();
 }

 /// <summary>
 /// 移动
 /// </summary>
 /// <param name="node">将要移动到的节点</param>
 /// <returns>返回状态</returns>
 private SerpentState SerpentMove(Node node)
 {
  if (!node.IsPass)
  {
  return SerpentState.Error;
  }
  serpent.InsertNode(node);
  if (!node.IsFood)
  {
  //不是食物，则移除最后一个节点
  serpent.RemoveNode();
  }
  else
  {
  lblCount.BeginInvoke(new MethodInvoker(delegate()
  {
   this.lblCount.Text = (Convert.ToInt32(this.lblCount.Text.Trim()) + 1).ToString();
  }));
  map.SetFood();//设置食物
  }

  if (serpent.IsMax())
  {
  return SerpentState.NextLevel;
  }
  return SerpentState.Moving;
 }

 private void MainForm_KeyUp(object sender, KeyEventArgs e)
 {
  if (e.KeyCode == Keys.Space)
  {
  thissleeptime = sleepTime;
  }
 }

 private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
 {
  int index = 1;
  int index_count = Convert.ToInt32(comboBox1.Text);
  for (int i = 1; i < index_count; i++)
  {
  index = index * 2;
  }
  level = index_count;
  sleepTime = 1000 / index;
  thissleeptime = sleepTime;
  btnStop.Enabled = false;
  button3.Enabled = false;
  button2.Enabled = true;
  IsWork = false;

  SetMap();
  lblCount.Text = "5";
  lblLevel.Text = index_count.ToString();
  serpent.Direction = Direction.Right;

 }

 private void checkBox1_Click(object sender, EventArgs e)
 {
  comboBox1.Enabled = this.checkBox1.Checked;
 }

 }
 public enum SerpentState
 {
 Moving,
 NextLevel,
 Error
 }
}

Main interface

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