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PORotate the player in XNA
 

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  1. PORotate the player in XNA
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    <p>I've been looking around for a tutorial on how to do this properly and Google keeps coming up empty. Maybe this is a really simple subject, but I'm not sure what to do.</p> <p>What I've found so far gives me code that looks like this:</p> <pre><code> if (currentKeyboardState.IsKeyDown(Keys.A)) { RotationAngle += 0.01f; float circle = MathHelper.Pi * 2; RotationAngle = RotationAngle % circle; } </code></pre> <p>Only, this doesn't do much. It came from <a href="http://msdn.microsoft.com/en-gb/library/bb203869%28v=xnagamestudio.40%29.aspx" rel="nofollow">MSDN</a>. That was the best-looking solution I could find.</p> <p>All I want to do is allow the player to spin their ship around and shoot in another direction. I'm making a game that bears a fair resemblance to asteroids, but I can only shoot in one direction at the moment.</p> <p>Any help would be appreciated :)</p> <p>Edit: This is my current Player.cs:</p> <pre><code>using System; using Microsoft.Xna.Framework; using Microsoft.Xna.Framework.Graphics; using Microsoft.Xna.Framework.Input; namespace GameTest { class Player { public Texture2D PlayerTexture; public Vector2 Position; public bool Alive; public int Health; public Vector2 origin; public float RotationAngle; KeyboardState currentKeyboardState; KeyboardState previousKeyboardState; public int Width { get { return PlayerTexture.Width; } } public int Height { get { return PlayerTexture.Height; } } public void Initialize(Texture2D texture, Vector2 position) { PlayerTexture = texture; Position = position; Alive = true; Health = 10; origin.X = PlayerTexture.Width / 2; origin.Y = PlayerTexture.Height / 2; } public void Update(GameTime gameTime) { RotationAngle += 10f; previousKeyboardState = currentKeyboardState; currentKeyboardState = Keyboard.GetState(); float elapsed = (float)gameTime.ElapsedGameTime.TotalSeconds; if (currentKeyboardState.IsKeyDown(Keys.A)) { //float circle = MathHelper.Pi * 2; //RotationAngle = RotationAngle % circle; } if (currentKeyboardState.IsKeyDown(Keys.D)) { //rotation } } public void Draw(SpriteBatch spriteBatch) { spriteBatch.Draw(PlayerTexture, Position, null, Color.White, RotationAngle, origin, 1f, SpriteEffects.None, 0f); } } } </code></pre>
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    1. USTom Sykes
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    1. COAre you using that `RotationAngle` when drawing your sprite to screen? I'm fairly certain the `SpriteBatch` has overloads that may or may not require a rotation.
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    2. COWhat do you mean by "it doesn't do much"? Is the player drawn rotated? Do you now need to work out how to shoot at an angle for example?
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      1. USGeorge Duckett
    3. COI am using it in the `SpriteBatch`, yeah. And I mean it doesn't rotate the sprite at all, it does nothing at the moment.
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      1. USTom Sykes
 

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