出于某种原因，即使它们是透明的，我的敌舰和敌人的子弹也会出现白色背景。
Mains cs
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--;
}
}
}
}
}
Enemy 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
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);
}
}
}
播放器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);
}
}
}
starfield 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 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，不太确定如何截图我的游戏已被播放，所以你可以看到最新情况。但由于某种原因，它只是我的敌人子弹和船舶，显示为白色背景。我已经在photoshop中检查了它们，所有其他图像都是透明的。
如果有人能提供任何帮助，那将非常感谢你
答案 0 :(得分：1)
而不是使用
spriteBatch.Begin();
尝试使用
spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend);
AlphaBlend是“内置状态对象，具有alpha混合设置，使用alpha混合源数据和目标数据。”