Question

我是XNA的新手。我正在尝试构建一个小型2D游戏，其中敌人（球）从屏幕顶部随机掉落。玩家可以在屏幕内移动。我想要做的是当球员（太空船）与球碰撞时，球将从屏幕上移除。我不知道该怎么做。谁能帮我这个？这是我的代码 -

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.GamerServices;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Media;

namespace RandomSprite
{

    public class Game1 : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;
        TimeSpan timeSpan = TimeSpan.FromMilliseconds(2000);
        Sprite spaceShip;
        Texture2D ballTexture;
        Texture2D backgroundtexture;
        Vector2 ballPos = new Vector2(100f, 100f);

        List<Sprite> ballList = new List<Sprite>();

        float timer = 0f;
        float dropInterval = .50f;
        float speed = 4f;

        Random random;



        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
        }

        protected override void Initialize()
        {
            // TODO: Add your initialization logic here
            random = new Random();

            base.Initialize();
        }
        protected override void LoadContent()
        {
            // Create a new SpriteBatch, which can be used to draw textures.
            backgroundtexture = Content.Load<Texture2D>("dungeon600x400");

            spriteBatch = new SpriteBatch(GraphicsDevice);
            ballTexture = Content.Load<Texture2D>("ball");

            spaceShip = new Sprite();
            spaceShip.Texture = Content.Load<Texture2D>("gugu");

            // retrieve the height of the screen
            int screenHeight = GraphicsDevice.Viewport.Height;
            // find the center point of the screen along the x-axis
            int screenCenterX = GraphicsDevice.Viewport.Width / 2;
            spaceShip.Position = new Vector2(
                screenCenterX - (spaceShip.Texture.Width / 2),
                screenHeight - spaceShip.Texture.Height - 20);
        }
       private void HandleInput()
        {
            // Retrieve the current state of the keyboard
            KeyboardState keyboardState = Keyboard.GetState();

            Vector2 playerVelocity = Vector2.Zero;

            // Check if the Left arrow key is pressed and change the velocity of the character accordingly
            if (keyboardState.IsKeyDown(Keys.Left))
            {
                playerVelocity += new Vector2(-speed, 0);

            }

            // Check if the Right arrow key is pressed and change the velocity of the character accordingly
            if (keyboardState.IsKeyDown(Keys.Right))
            {
                playerVelocity += new Vector2(speed, 0);
            }
            if (keyboardState.IsKeyDown(Keys.Up))
            {
                playerVelocity += new Vector2(0, -speed);
            }
            if (keyboardState.IsKeyDown(Keys.Down))
            {
                playerVelocity += new Vector2(0, speed);
            }
            // Apply the velocity to the character's position
            spaceShip.Position += playerVelocity;
        }
        public void HandleFallingCake()
        {
            List<Sprite> toRemove = new List<Sprite>();



            foreach (Sprite ball in ballList)
            {
                if (ball.Position.Y > (GraphicsDevice.Viewport.Height - 100))
                    toRemove.Add(ball);
                else
                    ball.Position += new Vector2(0, speed);
            }


            if (toRemove.Count==1 )
            {
                foreach (Sprite cake in toRemove)
                {
                    ballList.Remove(cake);




                }
            }

        }


        protected override void Update(GameTime gameTime)
        {
            // Allows the game to exit
            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
                this.Exit();

            // TODO: Add your update logic here
            timer += (float)gameTime.ElapsedGameTime.TotalSeconds;


            if (timer >= dropInterval)
            {

                int xPos = random.Next(GraphicsDevice.Viewport.Width-50);
                ballList.Add(new Sprite(ballTexture, new Vector2(xPos, -100)));
                timer = 0f;
            }
            HandleFallingCake();
            HandleInput();

            timeSpan -= gameTime.ElapsedGameTime;


            if (timeSpan <= TimeSpan.Zero)
            {

                timeSpan = TimeSpan.FromMilliseconds(2000);
            }


            base.Update(gameTime);
        }

        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.CornflowerBlue);

            // TODO: Add your drawing code here
            spriteBatch.Begin();
            //spriteBatch.Draw(backgroundtexture, new Rectangle(0,0,GraphicsDevice.Viewport.Width, GraphicsDevice.Viewport.Height), Color.White);
            spaceShip.Draw(spriteBatch);
            foreach (Sprite ball in ballList)
            {
                ball.Draw(spriteBatch);
            }
            spriteBatch.End();
            base.Draw(gameTime);
        }
    }
}

我有一个子类sprite.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace RandomSprite
{
    class Sprite
    {
        public Texture2D Texture;
        public Vector2 Position ;

        public Sprite() { }

        public Sprite(Texture2D texture, Vector2 position)
        {
            Texture = texture;
            Position = position;
        }

        public void Draw(SpriteBatch spriteBatch)
        {
            if (Texture != null)
                spriteBatch.Draw(Texture, Position, Color.White);
        }


    }
}

Answer 1

您描述目标，但不提问题。

如果你想知道如何检查两个对象的交集，那么你需要为它们定义边界（类Rectangle）并检查它们的交集方法Rectangle.Intersect。无论如何，更好地调整你的问题。

C＃XNA使用随机下降精灵进行碰撞检测

1 个答案: