Sprite Movement and Animation in XNA

I am making and RPG and have coded the movement and animation for the sprites. When I run the project, the sprite will move down or right. When the right arrow key is pressed, the sprite will move right, but will not stop. When the down key is pressed, the sprite will move down, and stop when the key is released. However, when you press another arrow key once you have pressed the down or right key, the sprite image won't change direction. Also, the sprite images do not change when a new arrow key is pressed. Why is this happening? Any help is appreciated.

Game.cs

Code:

---

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 RPG
{
    /// <summary>
    /// Default Project Template
    /// </summary>
    public class Game1 : Game
    {

        #region Fields

        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;
        Vector2 aPosition = new Vector2(250, 100);
        MageChar mageSprite;

        #endregion

        #region Initialization

        public Game1 ()
        {

            graphics = new GraphicsDeviceManager (this);

            Content.RootDirectory = "Content";

            graphics.IsFullScreen = false;
        }

        /// <summary>
        /// Overridden from the base Game.Initialize. Once the GraphicsDevice is setup,
        /// we'll use the viewport to initialize some values.
        /// </summary>
        protected override void Initialize()
        {
            // TODO: Add your initialization logic here
            mageSprite = new MageChar();
            base.Initialize();
        }

        /// <summary>
        /// Load your graphics 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
            mageSprite.LoadContent(this.Content);         
        }

        #endregion

        #region Update and Draw

        /// <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)
        {
            // game exits id back button is pressed
            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
                this.Exit();

            // TODO: Add your update logic here
            //calls update method of MageChar class
            mageSprite.Update(gameTime);

            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)
        {
            graphics.GraphicsDevice.Clear(Color.CornflowerBlue);

            // TODO: Add your drawing code here
            spriteBatch.Begin();
            //calls draw method of MageChar class
            mageSprite.Draw(this.spriteBatch);
            spriteBatch.End();

            base.Draw(gameTime);
        }

        #endregion

    }
}

---

CharMovement

Code:

---

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 RPG
{
    public class CharMovement
    {
        //The asset name for the Sprite's Texture
        public string charSprite;
        //The Size of the Sprite (with scale applied)
        public Rectangle Size;
        //The amount to increase/decrease the size of the original sprite.
        private float mScale = 1.0f;
        //The current position of the Sprite
        public Vector2 Position = new Vector2(0, 0);
        //The texture object used when drawing the sprite
        private Texture2D charTexture;


        //Load the texture for the sprite using the Content Pipeline
        public void LoadContent(ContentManager theContentManager, string theCharSprite)
        {
            //loads the image of the sprite
            charTexture = theContentManager.Load<Texture2D>(theCharSprite);

            theCharSprite = charSprite;

            //creates a new rectangle the size of the sprite
            Size = new Rectangle(0, 0, (int)(charTexture.Width * mScale), (int)(charTexture.Height * mScale));
        }

        //Update the Sprite and change it's position based on the set speed, direction and elapsed time.
        public void Update(GameTime theGameTime, Vector2 theSpeed, Vector2 theDirection)
        {
            //calculates the position of the sprite using the speed and direction from the MageChar class
            Position += theDirection * theSpeed * (float)theGameTime.ElapsedGameTime.TotalSeconds;
            if (Position.X < 0)
            {
                Position.X = 0;
            }
            if (Position.Y < 0)
            {
                Position.Y = 0;
            }
        }

        //Draw the sprite to the screen
        public void Draw(SpriteBatch theSpriteBatch)
        {
            //draw the sprite to the screen inside a rectangle   
            theSpriteBatch.Draw(charTexture, Position,
                new Rectangle(0, 0, charTexture.Width, charTexture.Height),
                Color.White, 0.0f, Vector2.Zero, mScale, SpriteEffects.None, 0);
        }
    }

}

---

MageChar

Code:

---

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 RPG
{
    public class MageChar : CharMovement
    {
        //variable where sprite file name is stored
        string MageAssetName = "WalkingFront";
        //starting x position
        const int StartPositionX = 0;
        //starting y position
        const int StartPositionY = 0;
        //speed that the sprite will move on screen
        const int MageSpeed = 160;
        //move sprite 1 up/down when the arrow key is pressed
        const int MoveUp = 1;
        const int MoveDown = 1;
        const int MoveLeft = 1;
        const int MoveRight = 1;

        //used to store the current state of the sprite
        enum State
        {
            WalkingLeft,
            WalkingRight,
            WalkingFront,
            WalkingBack
        }
        //set to current state of the sprite. initally set to walking
        State CurrentState = State.WalkingFront;

        //stores direction of sprite
        Vector2 Direction = Vector2.Zero;

        //stores speed of sprite
        Vector2 Speed = Vector2.Zero;

        //stores previous state of keyboard
        KeyboardState PreviousKeyboardState;

        public void LoadContent(ContentManager theContentManager)
        {
            //sets position to the top left corner of the screen
            Position = new Vector2(StartPositionX, StartPositionY);

            //calls the load content method of the CharMovement class, passing in the content manager, and the name of the sprite image
            base.LoadContent(theContentManager, MageAssetName);
        }

        //checks state of the keyboard
        private void Update(KeyboardState aCurrentKeyboardState)
        {

            //run if the sprite is walking
            if (CurrentState == State.WalkingFront)
            {
                //sets direction and speed to zero
                Speed = Vector2.Zero;
                Direction = Vector2.Zero;

                //if left key is pressed, move left
                if (aCurrentKeyboardState.IsKeyDown(Keys.Left) == true)
                {
                    CurrentState = State.WalkingLeft;
                    MageAssetName = "WalkingLeft";
                    //speed of sprite movement
                    Speed.X -= MageSpeed;
                    //moves the sprite left
                    Direction.X -= MoveLeft;
                }
                //if right key is pressed, move right
                else if (aCurrentKeyboardState.IsKeyDown(Keys.Right) == true)
                {
                    CurrentState = State.WalkingRight;
                    MageAssetName = "WalkingRight";
                    //speed of sprite movement
                    Speed.X += MageSpeed;
                    //moves the sprite right
                    Direction.X += MoveRight;
                }
                //if up key is pressed, move up
                if (aCurrentKeyboardState.IsKeyDown(Keys.Up) == true)
                {
                    CurrentState = State.WalkingBack;
                    MageAssetName = "WalkingBack";
                    //speed of sprite movement
                    Speed.Y += MageSpeed;
                    //moves sprite up
                    Direction.Y += MoveUp;
                }
                //if down key is pressed, move down
                else if (aCurrentKeyboardState.IsKeyDown(Keys.Down) == true)
                {
                    CurrentState = State.WalkingFront;
                    MageAssetName = "WalkingFront";
                    //speed of sprite movement
                    Speed.Y -= MageSpeed;
                    //moves sprite down
                    Direction.Y -= MoveDown;
                }

            }
        }

        public void Update(GameTime theGameTime)
        {
            //obtains current state of the keyboard
            KeyboardState aCurrentKeyboardState = Keyboard.GetState();

            //calls in UpdateMovement and passes in current keyboard state
            Update(aCurrentKeyboardState);

            //set previous state to current state
            PreviousKeyboardState = aCurrentKeyboardState;

            //call update method of the charMovement class, passing in the gametime, speed and direction of the sprite
            base.Update(theGameTime, Speed, Direction);
        }


    }
}

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Looks like he can't change directions when he isn't walking. See this:

Code:

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//run if the sprite is walking
            if (CurrentState == State.WalkingFront)
            {
                //sets direction and speed to zero

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Move that line somewhere else, and repeat the code for other states

Thread moved from VB6 to C# forum

Quote:

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Originally Posted by dglienna

Looks like he can't change directions when he isn't walking. See this:

Code:

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//run if the sprite is walking
            if (CurrentState == State.WalkingFront)
            {
                //sets direction and speed to zero

---

Move that line somewhere else, and repeat the code for other states

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okay, I understand what to fix. Thanks.