My "AI" is just going in circles...

[Loli]

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;

namespace Enemy_AI_Tests
{
    class Chaser
    {
        public Vector2 mFaceThis;
        Vector2 mPosition = new Vector2(400, 400);
        Texture2D mTexture;

        public void LoadContent(ContentManager theContent)
        {
            mTexture = theContent.Load<Texture2D>("chasers");
        }

        public void Update(GameTime theTime)
        {
            float radians = (float)Math.Atan2(mFaceThis.X, mFaceThis.Y);
            float degrees = MathHelper.ToDegrees(radians);

            Vector2 speed = new Vector2((float)Math.Cos(degrees), 
                                        (float)Math.Sin(degrees)) * 2.0f;
            mPosition += speed;
        }

        public void Draw(SpriteBatch theBatch)
        {
            theBatch.Draw(mTexture, mPosition, Color.Lime);
        }
    }
}

As you can see this should face the desired target (I have specified that in my game1 class) and move towards it. However it just travels in circles... Any suggestions?

[NovembrDobby]

Switch around mFaceThis.X and mFaceThis.Y in the arguments passed to Atan2, it takes them as Y, X.

also you probably have to do something like:

float radians = (float)Math.Atan2(mFaceThis.Y - mPosition.Y, mFaceThis.X - mPosition.X));

[Loli]

Ahh. Thanks man. I'll try it now. I swear to god I've seen you around the XNA Forums...

[NovembrDobby]

Yeah, I lurk a lot and even post sometimes :)

[Loli]

Thought so. It didn't fix the problem... Could it be the part where I convert it to Degrees?

Game1 Class

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;
using Microsoft.Xna.Framework.Net;
using Microsoft.Xna.Framework.Storage;

namespace Enemy_AI_Tests
{
    /// <summary>
    /// This is the main type for your game
    /// </summary>
    public class Game1 : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;
        Cat mCat;
        Chaser mChaser;

        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
        }

        /// <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
            mCat = new Cat();
            mChaser = new Chaser();

            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);

            // TODO: use this.Content to load your game content here
            mCat.LoadContent(Content);
            mChaser.LoadContent(Content);
        }

        /// <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 (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
                this.Exit();

            // TODO: Add your update logic here
            mCat.Update(gameTime);
            mChaser.Update(gameTime);
            mChaser.mFaceThis = mCat.mPosition;

            base.Update(gameTime);
        }

        /// <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);

            // TODO: Add your drawing code here
            spriteBatch.Begin();
            mCat.Draw(spriteBatch);
            mChaser.Draw(spriteBatch);
            spriteBatch.End();

            base.Draw(gameTime);
        }
    }
}

[editline]09:48PM[/editline]

Nevermind... got it working. Missing a "-" symbol :P