Okay so I'm making a space invader type game in visual studio 2010 c# with xna studio, currently stuck on the bullet class it spawns the bullet but doesn't fire it off in the direction that the sprite is pointing. The bullet class says the Public Vector2 origin; isn't being assigned to anything & is remaining at its default value however I don't know what could be causing it.
Code for bullet
class Bullets
{
public Texture2D texture;
public Vector2 position;
public Vector2 velocity;
public Vector2 origin;
public bool isVisible;
public Bullets(Texture2D newTexture)
{
texture = newTexture;
isVisible = false;
}
public void Draw(SpriteBatch spriteBatch)
{
spriteBatch.Draw(texture, position, null, Color.White, 0f, origin, 1f, SpriteEffects.None, 1);
}
}
Code for the game is:
namespace Rotationgame
{
/// <summary>
/// This is the main type for your game
/// </summary>
public class Game1 : Microsoft.Xna.Framework.Game
{
GraphicsDeviceManager graphics;
SpriteBatch spriteBatch;
Vector2 spriteVelocity;
const float tangentialVelocity = 0f;
float friction = 1f;
Texture2D spriteTexture;
Rectangle spriteRectangle;
Rectangle screenRectangle;
// The centre of the image
Vector2 spriteOrigin;
Vector2 spritePosition;
float rotation;
// Background
Texture2D backgroundTexture;
Rectangle backgroundRectangle;
// Shield
Texture2D shieldTexture;
Rectangle shieldRectangle;
// Bullets
List<Bullets> bullets = new List<Bullets>();
KeyboardState pastKey;
public Game1()
{
graphics = new GraphicsDeviceManager(this);
Content.RootDirectory = "Content";
graphics.PreferredBackBufferWidth = 1250;
graphics.PreferredBackBufferHeight = 930;
screenRectangle = new Rectangle(
0,
0,
graphics.PreferredBackBufferWidth,
graphics.PreferredBackBufferHeight);
}
/// <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
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);
shieldTexture = Content.Load<Texture2D>("Shield");
shieldRectangle = new Rectangle(517, 345, 250, 220);
spriteTexture = Content.Load<Texture2D>("PlayerShipup");
spritePosition = new Vector2(640, 450);
backgroundTexture = Content.Load<Texture2D>("Background");
backgroundRectangle = new Rectangle(0, 0, 1250, 930);
// TODO: use this.Content to load your game content here
}
/// <summary>
/// UnloadContent will be called once per game and is the place to unload
/// all 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)
{
// Allows the game to exit
if (Keyboard.GetState().IsKeyDown(Keys.Escape))
this.Exit();
// TODO: Add your update logic here
if (Keyboard.GetState().IsKeyDown(Keys.Space) && pastKey.IsKeyUp(Keys.Space))
Shoot();
pastKey = Keyboard.GetState();
spritePosition = spriteVelocity + spritePosition;
spriteRectangle = new Rectangle((int)spritePosition.X, (int)spritePosition.Y,
spriteTexture.Width, spriteTexture.Height);
spriteOrigin = new Vector2(spriteRectangle.Width / 2, spriteRectangle.Height / 2);
if (Keyboard.GetState().IsKeyDown(Keys.Right)) rotation += 0.025f;
if (Keyboard.GetState().IsKeyDown(Keys.Left)) rotation -= 0.025f;
if (Keyboard.GetState().IsKeyDown(Keys.Up))
{
spriteVelocity.X = (float)Math.Cos(rotation) * tangentialVelocity;
spriteVelocity.Y = (float)Math.Sin(rotation) * tangentialVelocity;
}
else if (Vector2.Zero != spriteVelocity)
{
float i = spriteVelocity.X;
float j = spriteVelocity.Y;
spriteVelocity.X = i -= friction * i;
spriteVelocity.Y = j -= friction * j;
base.Update(gameTime);
}
}
public void UpdateBullets()
{
foreach (Bullets bullet in bullets)
{
bullet.position += bullet.velocity;
if (Vector2.Distance(bullet.position, spritePosition) > 100)
bullet.isVisible = false;
}
for (int i = 0; i < bullets.Count; i++)
{
if(!bullets[i].isVisible)
{
bullets.RemoveAt(i);
i--;
}
}
}
public void Shoot()
{
Bullets newBullet = new Bullets(Content.Load<Texture2D>("ball"));
newBullet.velocity = new Vector2((float)Math.Cos(rotation),(float)Math.Sin(rotation)) * 5f + spriteVelocity;
newBullet.position = spritePosition + newBullet.velocity * 5;
newBullet.isVisible = true;
if(bullets.Count() < 20)
bullets.Add(newBullet);
}
/// <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.CornflowerBlue);
spriteBatch.Begin();
spriteBatch.Draw(backgroundTexture, backgroundRectangle, Color.White);
spriteBatch.Draw(shieldTexture, shieldRectangle, Color.White);
foreach (Bullets bullet in bullets)
bullet.Draw(spriteBatch);
spriteBatch.Draw(spriteTexture, spritePosition, null, Color.White, rotation, spriteOrigin, 1f, SpriteEffects.None, 0);
spriteBatch.End();
// TODO: Add your drawing code here
base.Draw(gameTime);
}
}
Where am I going wrong?
