Error in the projectile rotation and shoot

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C#

Monogame

Code is in C# and the IDE is Visual Studio2017.my code and assets are at diliupg / Space_Battles — Bitbucket[^].

My Space ship rotation code has something wrong cause when I fire the projectile shoots from the middle of the spaceship. There are no other errors. How can I get the spaceship to fire from the front?

What I have tried:

I create the lazer shot when I press the space by like this:

<pre>

if (keyboard.IsKeyDown(Keys.Space) && shoot)
{
    shoot = false;
    //is.fireInst.Play();
    this.fire.Play(.2f, .9f, 0);
    lazerX = (float)(spritePosX - (0) * Math.Cos(rotationAngle));
    lazerY = (float)(spritePosY - (0) * Math.Sin(rotationAngle));
 
    Projectile projectile = new Projectile(heroLazer, "heroLazer",
        lazerX, lazerY, rotationAngle);
 
    Game1.AddProjectile(projectile);
}
// then in the projectile class:

public Projectile(Texture2D lazerSprite, string spriteName,
    float posx, float posy, float heading)
{
    projectileSprite = lazerSprite;
    type = spriteName;
    spriteRotOrigin = new Vector2(projectileSprite.Width / 2, projectileSprite.Height / 2);
    spriteHeading = heading;
    spritePosX = posx; // the x position of the lazer
    spritePosY = posy; // the y position of the lazer
 
    spritePos = new Vector2(spritePosX, spritePosY);
    drawRectangle = new Rectangle((int)spritePosX, (int)spritePosY,
        projectileSprite.Width / 2, projectileSprite.Height / 2);
 
}
// then in the update method

<pre>public void update(GameTime gameTime, KeyboardState keyboard)
{
    //projectile active or not?
    if (active == true)
    {
        projectileAge += gameTime.ElapsedGameTime.Milliseconds;
 
        spritePosX += (float)(Math.Sin(spriteHeading) *
            gameTime.ElapsedGameTime.TotalMilliseconds) * ProjectileMoveAmount;
        spritePosY -= (float)(Math.Cos(spriteHeading) *
            gameTime.ElapsedGameTime.TotalMilliseconds) * ProjectileMoveAmount;
 
        spritePos = new Vector2(spritePosX, spritePosY);
    }
    if (projectileAge > projectileLife)
    {
        active = false;
    }
}
// then in the draw method like this
<pre lang="c#">public void Draw(SpriteBatch spriteBatch)
 {
     //spriteBatch.Draw(projectileSprite, drawRectangle, Color.White);
 
     spriteBatch.Draw(projectileSprite, spritePos, null,
         Color.FromNonPremultiplied(255, 255, 255, 255), spriteHeading,
         spriteRotOrigin, 1.0f, SpriteEffects.None, 0f);
 
 }