这是我的第一个更大的2D图形游戏传统的蛇形游戏，但是当蛇击中右侧（或左侧）时，它应该从另一侧进入相同的X和Y位置。我完全被困在了如何去做的想法 这是我的代码：
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using System;
using System.IO;
using System.Threading;
using System.Collections.Generic;
namespace SnakeJos
{
/// <summary>
/// This is the main type for your game.
/// </summary>
public class Game1 : Game
{
GraphicsDeviceManager graphics;
SpriteBatch spriteBatch;
SpriteFont spritefont;
Texture2D SnakeHead_texture;
Texture2D SnakeBody_texture;
Texture2D SnakeCandy_texture;
Vector2 SnakeHead_speed;
//Rectangle SnakeHead_rect;
Rectangle SnakeBody_rect;
Rectangle SnakeCandy_rect;
Rectangle NewHead;
List<Rectangle> SnakeHead_rect = new List<Rectangle>();
int life = 1;
int points = 0;
int highscore;
int bodyparts = 0;
Random CandyRandom;
StreamWriter sw;
StreamReader sr;
int wWidth;
int wHeight;
int DirectionState;
int time;
int millisecondsPerFrame = 100;
int timeSinceLastUpdate = 0;
Random random;
public Game1()
{
graphics = new GraphicsDeviceManager(this);
Content.RootDirectory = "Content";
}
/// <summary>
/// Allows the game to perform any initialization it needs to before starting to run.
/// This is where it can query for any required services and load any non-graphic
/// related content. Calling base.Initialize will enumerate through any components
/// and initialize them as well.
/// </summary>
protected override void Initialize()
{
// TODO: Add your initialization logic here
SnakeHead_speed.X = 1f;
DirectionState = 1;
wWidth = Window.ClientBounds.Width;
wHeight = Window.ClientBounds.Height;
time = 0;
sr = new StreamReader("Highscore.txt");
highscore = int.Parse(sr.ReadLine());
sr.Close();
CandyRandom = new Random();
base.Initialize();
}
/// <summary>
/// LoadContent will be called once per game and is the place to load
/// all of your content.
/// </summary>
protected override void LoadContent()
{
// Create a new SpriteBatch, which can be used to draw textures.
spriteBatch = new SpriteBatch(GraphicsDevice);
SnakeHead_texture = Content.Load<Texture2D>("pics/SnakeHead");
SnakeCandy_texture = Content.Load<Texture2D>("pics/SnakeCandy");
SnakeBody_texture = Content.Load<Texture2D>("pics/SnakeBody");
spritefont = Content.Load<SpriteFont>("Font/Font");
SnakeCandy_rect = new Rectangle(400, 300, SnakeCandy_texture.Width, SnakeCandy_texture.Height);
SnakeHead_rect.Add(new Rectangle(100, 100, SnakeHead_texture.Width, SnakeHead_texture.Height));
SnakeHead_rect.Add(new Rectangle(100,80, SnakeBody_texture.Width, SnakeBody_texture.Height));
SnakeHead_rect.Add(new Rectangle(100, 60, SnakeBody_texture.Width, SnakeBody_texture.Height));
// TODO: use this.Content to load your game content here
}
/// <summary>
/// UnloadContent will be called once per game and is the place to unload
/// game-specific content.
/// </summary>
protected override void UnloadContent()
{
// TODO: Unload any non ContentManager content here
}
/// <summary>
/// Allows the game to run logic such as updating the world,
/// checking for collisions, gathering input, and playing audio.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
protected override void Update(GameTime gameTime)
{
//time++;
//if (time == 20)
// time = 0;
if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed || Keyboard.GetState().IsKeyDown(Keys.Escape))
Exit();
KeyboardState ks = Keyboard.GetState();
if (ks.IsKeyDown(Keys.Down) && DirectionState != 0)
DirectionState = 1;
else if (ks.IsKeyDown(Keys.Up) && DirectionState != 1)
DirectionState = 0;
if (ks.IsKeyDown(Keys.Left) && DirectionState != 3)
DirectionState = 2;
else if (ks.IsKeyDown(Keys.Right) && DirectionState != 2)
DirectionState = 3;
timeSinceLastUpdate += (int)gameTime.ElapsedGameTime.TotalMilliseconds;
timeSinceLastUpdate++;
if (timeSinceLastUpdate >= millisecondsPerFrame)
{
timeSinceLastUpdate = 0;
int ListLength = SnakeHead_rect.Count;
SnakeHead_rect.RemoveAt(ListLength-1);
Rectangle NewHead = SnakeHead_rect[0];
if (DirectionState == 1)
NewHead.Y += 20;
else if (DirectionState == 0)
NewHead.Y -= 20;
if (DirectionState == 2)
NewHead.X -= 20;
else if (DirectionState == 3)
NewHead.X += 20;
//SnakeHead_rect[0] = NewHead;
SnakeHead_rect.Insert(0, NewHead);
if (SnakeHead_rect[0].Intersects(SnakeCandy_rect))
{
int tempWidth = CandyRandom.Next(20, wWidth - SnakeHead_texture.Width);
int tempHeight = CandyRandom.Next(20, wHeight - SnakeHead_texture.Height);
int widthRest = tempWidth % 20;
int HeightRest = tempHeight % 20;
SnakeCandy_rect.X = tempWidth - widthRest;
SnakeCandy_rect.Y = tempHeight - HeightRest;
ListLength = SnakeHead_rect.Count - 1;
SnakeHead_rect.Add(new Rectangle(SnakeHead_rect[ListLength].X, SnakeHead_rect[ListLength].Y, SnakeBody_texture.Width, SnakeBody_texture.Height));
}
for (int i = 1; i < SnakeHead_rect.Count; i++)
{
if (SnakeHead_rect[0].Intersects(SnakeHead_rect[i]))
{
Exit();
}
}
}
base.Update(gameTime);
}
/// <summary>
/// This is called when the game should draw itself.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.Pink);
spriteBatch.Begin();
for (int i = 0; i < SnakeHead_rect.Count; i++)
spriteBatch.Draw(SnakeHead_texture, SnakeHead_rect[i], Color.White);
spriteBatch.Draw(SnakeCandy_texture, SnakeCandy_rect, Color.White);
spriteBatch.DrawString(spritefont, "direction" + DirectionState, new Vector2 (10,10), Color.Black);
spriteBatch.End();
base.Draw(gameTime);
}
}
}
答案 0 :(得分：2)
如果你的蛇撞到墙上，它就不能进入同一个X和Y位置＆＃34;
如果它碰到右墙，则表示X坐标处于最大值，因此您应将其设置为null并保持Y坐标相同。
如果它撞到左墙，你再次离开Y坐标并将其X坐标从最小值设置为最大值。
如果蛇击中底壁你会有相同的Y值，所以你需要将它设置为最小值。