某些图像仅以白色背景出现，即使图像是透明的

Question

由于某些原因，我的敌舰和敌方子弹显示为白色背景，即使它们是透明的。

主电源

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 Example_Space_Game
{
    /// <summary>
    /// This is the main type for your game
    /// </summary>
    public class Game1 : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;
        Random random = new Random();
        public int enemyBulletDamage;

        //List
        List<Asteroid> asteroidList = new List<Asteroid>();
        List<Enemy> enemyList = new List<Enemy>();

        //Instantiating new player and objects
        Player p = new Player();
        Starfield sf = new Starfield();       

        //constructor
        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            graphics.IsFullScreen = false;
            graphics.PreferredBackBufferWidth = 800;
            graphics.PreferredBackBufferHeight = 950;
            this.Window.Title = " XNA - 2D Space Shooter ";
            Content.RootDirectory = "Content";
            enemyBulletDamage = 10;
        }

        //init
        protected override void Initialize()
        {
            base.Initialize();
        }

        //Load Content
        protected override void LoadContent()
        {
            spriteBatch = new SpriteBatch(GraphicsDevice);

            p.LoadContent(Content);
            sf.LoadContent(Content);
        }

        //Unload Content
        protected override void UnloadContent()
        {
        }

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

            //Updating enemy's and checking collision of enemyship to playership
            foreach (Enemy e in enemyList)
            {
                //check if enemyship is colliding with player
                if(e.boundingBox.Intersects(p.boundingBox))
                {
                    p.health -= 40;
                    e.isVisible = false;
                }

                //check enemy bullet collision with player ship
                for(int i = 0; i < e.bulletList.Count; i++)
                {
                    if(p.boundingBox.Intersects(e.bulletList[i].boundingBox))
                    {
                        p.health -= enemyBulletDamage;
                        e.bulletList[i].isVisible = false;
                    }
                }

                //check player bullet collision to enemy ship
                for (int i = 0; i < p.bulletlist.Count; i++)
                {
                    if(p.bulletlist[i].boundingBox.Intersects(e.boundingBox))
                    {
                        p.bulletlist[i].isVisible = false;
                        e.isVisible = false;
                    }
                }

                e.Update(gameTime);
            }


            //for each asteroid in our asteroidList, update it and check for collisions
            foreach(Asteroid a in asteroidList)
            {
                //check to see if any of the asteroids are colliding with our playership, if they are... set invisible to false (remove then from our list)
                if(a.boundingBox.Intersects(p.boundingBox))
                {
                    p.health -= 20;
                    a.isVisible = false;
                }

                //iterate through our bulletList if any asteroid come in contacts with these bullets, destroyed bullet and asteroid
                for (int i = 0; i < p.bulletlist.Count; i++)
                {
                    if(a.boundingBox.Intersects(p.bulletlist[i].boundingBox))
                    {
                        a.isVisible = false;
                        p.bulletlist.ElementAt(i).isVisible = false;
                    }
                }

                a.Update(gameTime);
            }

            p.Update(gameTime);
            sf.Update(gameTime);
            LoadAsteroids();
            LoadEnemies();

            base.Update(gameTime);
        }

        //Draw Content
        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.CornflowerBlue);
            spriteBatch.Begin();

            sf.Draw(spriteBatch);
            p.Draw(spriteBatch);
            foreach(Asteroid a in asteroidList)
            {
                a.Draw(spriteBatch);
            }

            foreach(Enemy e in enemyList)
            {
                e.Draw(spriteBatch);
            }

            spriteBatch.End();
            base.Draw(gameTime);
        }

        //Load Asteroids
        public void LoadAsteroids()
        {
            // Creating random variables for our x and y axis of our controls
            int randY = random.Next(-600, -50);
            int randX = random.Next(0, 750);

            //if there are less than 5 asteroids on the screen, than create more until there is 5 again
            if(asteroidList.Count() < 5)
            {
                asteroidList.Add(new Asteroid(Content.Load<Texture2D>("asteroid"), new Vector2(randX, randY)));
            }

            //if any of the enemies in the list were destroyed (or invisible), then remove from the list
            for (int i = 0; i < asteroidList.Count; i++)
            {
                if(!asteroidList[i].isVisible)
                {
                    asteroidList.RemoveAt(i);
                    i--;
                }
            }
        }

        //Load Enemies
        public void LoadEnemies()
        {
            // Creating random variables for our x and y axis of our controls
            int randY = random.Next(-600, -50);
            int randX = random.Next(0, 750);

            //if there are less than 3 enemies on the screen, than create more until there is 3 again
            if(enemyList.Count() < 3)
            {
                enemyList.Add(new Enemy(Content.Load<Texture2D>("enemyship"), new Vector2(randX, randY), Content.Load<Texture2D>("EnemyBullet")));
            }

            //if any of the enemies in the list were destroyed (or invisible), then remove from the list
            for (int i = 0; i < enemyList.Count; i++)
            {
                if(!enemyList[i].isVisible)
                {
                    enemyList.RemoveAt(i);
                    i--;
                }
            }
        }
    }
}

敌人cs

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

    namespace Example_Space_Game
    {
        public class Enemy
        {
            public Rectangle boundingBox;
            public Texture2D texture, bulletTexture;
            public Vector2 position;
            public int health, speed, bulletDelay, currentDifficultyLevel;
            public bool isVisible;
            public List<Bullet> bulletList;

            //Constructor
            public Enemy(Texture2D newTexture, Vector2 newPosition, Texture2D newBulletTexture)
            {
                bulletList = new List<Bullet>();
                texture = newTexture;
                bulletTexture = newBulletTexture;
                health = 5;
                position = newPosition;
                currentDifficultyLevel = 1;
                bulletDelay = 40;
                speed = 5;
                isVisible = true;
            }

            //Update
            public void Update(GameTime gameTime)
            {
                //Update Collision rectangle
                boundingBox = new Rectangle((int)position.X, (int)position.Y, texture.Width, texture.Height);

                //Update enemy movement
                position.Y += speed;

                //Move enemy to top of the screen if he fly's off the bottom
                if (position.Y >= 950)
                    position.Y = -75;

                EnemyShoot();
                UpdateBullets();
            }

            //Draw
            public void Draw(SpriteBatch spriteBatch)
            {
                //Draw enemy ship
                spriteBatch.Draw(texture, position, Color.White);

                //Drwa enemy bullets
                foreach (Bullet b in bulletList)
                {
                    b.Draw(spriteBatch);
                }
            }

            //Update bullet function
            public void UpdateBullets()
            {
                //for each bullet in out bulletList: update the movement and if the bullet hits the top of the screen remove it from the list
               foreach (Bullet b in bulletList)
               {
                   //BoundingBox for every bullet in our bulletList
                   b.boundingBox = new Rectangle((int)b.position.X, (int)b.position.Y, b.texture.Width, b.texture.Height);

                   //set movement for bullet
                   b.position.Y = b.position.Y + b.speed;

                   //if bullet hits the top of the screen, then make visible false
                   if (b.position.Y >= 950)
                       b.isVisible = false;
               }

                //iterate through bulletList and see if any of the bullets are not visible, if they aren't then remove that bullet from out bullet list
                for (int i = 0; i < bulletList.Count; i++)
                {
                    if(!bulletList[i].isVisible)
                    {
                        bulletList.RemoveAt(i);
                        i--;
                    }
                }
            }

            //enemy shoot function
            public void EnemyShoot()
            {
                //Shoot only if the bulletdelay resets
                if (bulletDelay >= 0)
                    bulletDelay--;

                if(bulletDelay <= 0)
                {
                    //create new bullet and position it front and centre of enemy ship
                    Bullet newBullet = new Bullet(bulletTexture);
                    newBullet.position = new Vector2(position.X + texture.Width / 2 - newBullet.texture.Width / 2, position.Y + 30);

                    newBullet.isVisible = true;

                    if (bulletList.Count() < 20)
                        bulletList.Add(newBullet);
                }

                //reset bullet delay
                if (bulletDelay == 0)
                    bulletDelay = 40;
            }
        }
    }

子弹cs

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

namespace Example_Space_Game
{
    //Main
    public class Bullet
    {
        public Rectangle boundingBox;
        public Texture2D texture;
        public Vector2 origin;
        public Vector2 position;
        public bool isVisible;
        public float speed;

        //Constructor
        public Bullet(Texture2D newTexture)
        {
            speed = 10;
            texture = newTexture;
            isVisible = false;

        }

        //Draw
        public void Draw(SpriteBatch spriteBatch)
        {
            spriteBatch.Draw(texture, position, Color.White);
        }
    }
}

玩家cs

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


namespace Example_Space_Game
{
    //main
    public class Player
    {
        public Texture2D texture, bulletTexture, healthTexture;
        public Vector2 position, healthbarPosition;
        public int speed, health;
        public float bulletDelay;
        public Rectangle boundingBox, healthRectangle;
        public bool IsColliding;
        public List<Bullet> bulletlist;

        //---Contructor---
        public Player()
        {
            bulletlist = new List<Bullet>();
            texture = null;
            position = new Vector2(300, 300);
            bulletDelay = 1;
            speed = 10;
            IsColliding = false;
            health = 200;
            healthbarPosition = new Vector2(50, 50);
        }

        //---Load Content---
        public void LoadContent(ContentManager Content)
        {
            texture = Content.Load<Texture2D>("ship");
            bulletTexture = Content.Load<Texture2D>("playerbullet");
            healthTexture = Content.Load<Texture2D>("healthbar");
        }

        //---Draw---
        public void Draw(SpriteBatch spriteBatch)
        {
            spriteBatch.Draw(texture, position, Color.White);
            spriteBatch.Draw(healthTexture, healthRectangle, Color.White);

            foreach (Bullet b in bulletlist)
                b.Draw(spriteBatch);



        }

        //---Update---
        public void Update(GameTime gameTime)
        {
            //Getting Keyboard State
            KeyboardState keyState = Keyboard.GetState();

            //BoundingBox for player ship
            boundingBox = new Rectangle((int)position.X, (int)position.Y, texture.Width, texture.Height);

            //Set rectangle for health bar
            healthRectangle = new Rectangle((int)healthbarPosition.X,(int)healthbarPosition.Y, health, 25);

            //Fire bullets
            if(keyState.IsKeyDown(Keys.Space))
            {
                Shoot();
            }

            UpdateBullets();
            //Ship Controls
            if (keyState.IsKeyDown(Keys.W))
                position.Y = position.Y - speed;

            if (keyState.IsKeyDown(Keys.A))
                position.X = position.X - speed;

            if (keyState.IsKeyDown(Keys.S))
                position.Y = position.Y + speed;

            if (keyState.IsKeyDown(Keys.D))
                position.X = position.X + speed;

            //keep ship in scren bounds
            if (position.X <= 0)
                position.X = 0;

            if (position.X >= 800 - texture.Width)
                position.X = 800 - texture.Width;

            if (position.Y <= 0)
                position.Y = 0;

            if (position.Y >= 950 - texture.Height)
                position.Y = 950 - texture.Height;
        }

        //---Shoot Method: used to set starting position of our bullets---
        public void Shoot()
        {
            //shoot only if bullet delay resets
            if (bulletDelay >= 0)
                bulletDelay--;

            //if bullet delay is at 0: create a new bullet at player position, make it visible, then add the bulel to the list
            if (bulletDelay <= 0)
            {
                Bullet newBullet = new Bullet(bulletTexture);
                newBullet.position = new Vector2(position.X + 32 - newBullet.texture.Width / 2, position.Y + 30);

                //Making bullet visible
                newBullet.isVisible = true;

                if (bulletlist.Count() < 20)
                    bulletlist.Add(newBullet);
            }

            //reset bullet delay
            if (bulletDelay == 0)
                bulletDelay = 20;
        }

        //---Update bullet function---
        public void UpdateBullets()
        {
            //for each bullet in out bulletlist: update the movement and if the bullet hits the top of the screen remove it from the list
            foreach (Bullet b in bulletlist)
            {
                //boundbox for our every bullet in our bulletlist
                b.boundingBox = new Rectangle((int)b.position.X, (int)b.position.Y, b.texture.Width, b.texture.Height);

                //set movement for bullet
                b.position.Y = b.position.Y - b.speed;

                //if bullet hits the top of the screen, then make visible false
                if(b.position.Y<=0)
                    b.isVisible=false;
            }

            //Iterate through the bulletlist and see if any of the bullets are not visible, if they aren't remove that bullet from our bulletlist
            for (int i = 0; i < bulletlist.Count; i++)
            {
                if (!bulletlist[i].isVisible)
                {
                    bulletlist.RemoveAt(i);
                    i--;
                }
            }        
        }
    }
}

小行星 cs

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


namespace Example_Space_Game
{
   public class Asteroid
    {
       public Rectangle boundingBox;
       public Texture2D texture;
       public Vector2 position;
       public Vector2 origin;
       public float rotationAngle;
       public int speed;

       public bool isVisible;
       Random random = new Random();
       public float randX, randY;

       //Constructor
       public Asteroid(Texture2D newTexture, Vector2 newPosition)
       {
           position = newPosition;
           texture = newTexture;
           speed = 4;
           isVisible = true;
           randX = random.Next(0, 750);
           randY = random.Next(-600, -50);

       }

       //Load Content
       public void LoadContent(ContentManager Content)
       {

       }

       //Update
       public void Update(GameTime gameTime)
       {
           //Set bounding box for collision
           boundingBox=new Rectangle((int)position.X,(int)position.Y, 45, 45);

           //updating origin for rotation
           //origin.X = texture.Width / 2;
           //origin.Y = texture.Height / 2;

           //Udate Movement
           position.Y = position.Y + speed;
           if (position.Y>=950)
               position.Y=-50;

           //Rotate Asteroid
           //float elapsed =(float)gameTime.ElapsedGameTime.TotalSeconds;
           //rotationAngle += elapsed;
           //float circle=MathHelper.Pi * 2;
           //rotationAngle=rotationAngle % circle;
       }

       //Draw
       public void Draw(SpriteBatch spriteBatch)
       {
           if(isVisible)
               spriteBatch.Draw(texture, position, Color.White);
       }
    }
}

星际争霸

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
namespace Example_Space_Game
{
    public class Starfield
    {
        public Texture2D texture;
        public Vector2 bgPos1, bgPos2;
        public int speed;

        //Constructor
        public Starfield()
        {
            texture=null;
            bgPos1=new Vector2(0,0);
            bgPos2 = new Vector2(0, -950);
            speed=5;

        }

        //Load Content
        public void LoadContent(ContentManager Content)
        {
            texture = Content.Load<Texture2D>("space");
        }

        //Draw
        public void Draw(SpriteBatch spriteBatch)
        {
            spriteBatch.Draw(texture, bgPos1, Color.White);
            spriteBatch.Draw(texture, bgPos2, Color.White);
        }

        //Update
        public void Update(GameTime gametime)
        {
            //Setting speed for background scrolling
            bgPos1.Y = bgPos1.Y + speed;
            bgPos2.Y = bgPos2.Y + speed;

            //Scrolling background (repeating)
            if (bgPos1.Y >=950)
            {
                bgPos1.Y = 0;
                bgPos2.Y = -950;
            }
        }

    }

}

以上是我的所有代码，不太确定如何截取我玩过的游戏，这样您也可以看到发生了什么。但出于某种原因，它只是我的敌人子弹和飞船，它们以白色背景显示。我已经在 photoshop 中检查了它们，它们和其他所有图像一样是透明的。

如果有人能提供帮助，将非常感谢

Answer 1

而不是使用

spriteBatch.Begin();

尝试使用

spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend);

AlphaBlend 是 "A built-in state object with settings for alpha blend that is blending the source and destination data using alpha."

某些图像仅以白色背景出现，即使图像是透明的

certain images only are appearing with a white background behind them, even though the images are transparent

c#

xna

xna-4.0