I am trying to render a sprite on the screen that will not move but only rotate.

I want to make it so when you press the 'A' key it rotates counterclockwise and if you press the 'D' key it rotates clockwise

I am very new to XNA so i know my code isnt the best atm i tend to make 1 small program and add to it piece by piece so when i go through these learning programs they tend to not be as clean as they can be.


class GameObject
{
public Vector2 position;
public Rectangle rect;
public Texture2D image;
public float rotation;
public Vector2 origin;
public GameObject()
{
position = new Vector2(300, 300);
rect = new Rectangle(300, 300, 64, 64);
rotation = 0.0f;
origin.X = position.X + (rect.Width / 2);
origin.Y = position.Y + (rect.Height / 2);
}
public void loadContent(ContentManager manager)
{
image = manager.Load<Texture2D>("up");
}
public void draw(SpriteBatch batch)
{

batch.Draw(image, position, Color.White);
//batch.Draw(image, rect, null, Color.White, rotation, origin, SpriteEffects.None, 0f);


}
public void update(KeyboardState k_state)
{

if (k_state.IsKeyDown(Keys.A))
{
rotation -= 0.1f;
}
if (k_state.IsKeyDown(Keys.D))
{
rotation += 0.1f;
}
}
}


in my draw method when i make the uncommented call it draws my arrow fine ... no rotation but everything is drawn at the correct spots.
when i draw using the commented part the arrow is in a completely different position and it pivots more than it rotates. can anyone help me at all?

Thanks in advance

made another program and ill post code .... my draw code is

// this line draws my arrow in the perfect spot
//spriteBatch.Draw(image, position, Color.White);

// this line draws my arrow half visible in the top left corner of the screen. and it doesnt rotate but pivot.
spriteBatch.Draw(image, position, null, Color.White, rotation, origin, 1.0f,SpriteEffects.None, 0);

can anyone help me out here? thanks in advance


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 ArrowRotation
{

public class Game1 : Microsoft.Xna.Framework.Game
{
GraphicsDeviceManager graphics;
SpriteBatch spriteBatch;
SpriteFont font1;
KeyboardState k_current_state;
Vector2 position;
Vector2 origin;
float rotation;
Texture2D image;
public Game1()
{
graphics = new GraphicsDeviceManager(this);
Content.RootDirectory = "Content";
}

protected override void Initialize()
{
// TODO: Add your initialization logic here
position.X = 200;
position.Y = 200;
origin.X = position.X + 32;
origin.Y = position.Y + 32;
rotation = 0.0f;
base.Initialize();
}

protected override void LoadContent()
{
// Create a new SpriteBatch, which can be used to draw textures.
spriteBatch = new SpriteBatch(GraphicsDevice);
font1 = Content.Load<SpriteFont>("testFont");
image = Content.Load<Texture2D>("up");

}

protected override void UnloadContent()
{
// TODO: Unload any non ContentManager content here
}

protected override void Update(GameTime gameTime)
{
k_current_state = Keyboard.GetState();
if (k_current_state.IsKeyDown(Keys.Escape))
{
this.Exit();
}
if (k_current_state.IsKeyDown(Keys.A))
{
rotation -= 0.1f;
}
if (k_current_state.IsKeyDown(Keys.D))
{
rotation += 0.1f;
}

base.Update(gameTime);
}

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

spriteBatch.DrawString(font1, "rotation = " + rotation.ToString(), new Vector2(0, 0), Color.White);
spriteBatch.DrawString(font1, "X position = " + position.X.ToString(), new Vector2(0, 30), Color.White);
spriteBatch.DrawString(font1, "Y position = " + position.Y.ToString(), new Vector2(0, 60), Color.White);
spriteBatch.DrawString(font1, "X Origin = " + origin.X.ToString(), new Vector2(0, 90), Color.White);
spriteBatch.DrawString(font1, "Y Origin = " + origin.Y.ToString(), new Vector2(0, 120), Color.White);
//spriteBatch.Draw(image, position, Color.White);
spriteBatch.Draw(image, position, null, Color.White, rotation, origin, 1.0f,SpriteEffects.None, 0);

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


Thanks a ton! Im at work atm but will try that out when i get home. you are awesome!