Sean-Ryan Smith

Maeve's Quest - 2D XNA Brawler

Recently I have put together a 2D side-scroller bralwer action game using Microsoft XNA. The main of the project was to better understand sprites and 2D game programming. I incorporated a free online tutorial sprite starter system and modified to to handle multiple sprites with different types of animations (ie. looped, unlooped, draw depth, timing, etc.). I also made use of OOP to divide up and organize the project. The classes make use of inheritance as well as polymorphism.

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Entity Class

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abstract public class Entity

{

#region Fields

protected Vector2 ePosition;  // position of entity

protected float eSpeed;// speed of movement

protected float eGravity;     // gravity

protected int eHealth;// health of entity

protected int eDamage;// damage of entity

protected int eScore;  // score of entity

protected bool eMoving;// if true, the entity is moving

protected bool eIsAlive;      // if true, the entity is alive

protected byte eDirection;    // direction of entity

protected bool moveLevel;     // allow background to move

public int screenWidth;// maximum X position for the entity

public int screenHeight;      // maximum Y position for the entity

#endregion

#region Initialize

public Entity()

{

  ePosition = Vector2.Zero;// position of entity

  eSpeed = 0.0f;        // speed of movement

  eGravity = 0.0f;      // gravity

  eHealth = 0;  // health of entity

  eDamage = 0;  // damage of entity

  eMoving = false;      // if true, the entity is moving

  eIsAlive = true;      // if true, the entity is alive

  eDirection = 0;       // 0 = right;  1 = left

  moveLevel = false;    // enemies are alive, don't move

  eScore = 0;

}

public virtual void LoadContent(GraphicsDevice graphics)

{

  screenWidth = (int)(graphics.Viewport.Width);

  screenHeight = (int)(graphics.Viewport.Height);

}

#endregion

Sprite Class

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/// <summary>

/// Add an animation to the animations dictionary.

/// </summary>

/// <param name="Name">Sprite-specific name of the animation.</param>

/// <param name="X">X Location of the upper left corner of first frame</param>

/// <param name="Y">Y Location of the upper left corner of first frame</param>

/// <param name="Width">Width of the animation's frames</param>

/// <param name="Height">Height of the animation's frames</param>

/// <param name="Frames">Number of frames in the animation</param>

/// <param name="FrameLength">Length (in seconds) to display each frame</param>

public void AddAnimation(string Name, 
  int X, int Y, int Width, int Height, int Frames, float FrameLength)

{

  faAnimations.Add(Name, 
    new FrameAnimation(X, Y, Width, Height, Frames, FrameLength));

  iWidth = Width;

  iHeight = Height;

  v2Center = new Vector2(iWidth / 2, iHeight / 2);

}

/// <summary>

/// Add an animation to the animations dictionary.

/// </summary>

/// <param name="Name">Sprite-specific name of the animation.</param>

/// <param name="X">X Location of the upper left corner of first frame</param>

/// <param name="Y">Y Location of the upper left corner of first frame</param>

/// <param name="Width">Width of the animation's frames</param>

/// <param name="Height">Height of the animation's frames</param>

/// <param name="Frames">Number of frames in the animation</param>

/// <param name="NextAnimation">Name of the next animation after this</param>

public void AddAnimation(string Name, 
  int X, int Y, int Width, int Height, 
  int Frames, float FrameLength, string NextAnimation)

{

  faAnimations.Add(Name, 
    new FrameAnimation(X, Y, Width, Height, Frames, FrameLength, NextAnimation));

  iWidth = Width;

  iHeight = Height;

  v2Center = new Vector2(iWidth / 2, iHeight / 2);

}

Sprite Update

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#region Update

public void Update(GameTime gameTime)

{

  if (bAnimating)

  {

    // If there is not a currently active animation

    if (CurrentFrameAnimation == null)

    {

      // Make sure we have an animation associated with this sprite

      if (faAnimations.Count > 0)

      {

        // Set the active animation to the first animation

        // associated with this sprite

        string[] sKeys = new string[faAnimations.Count];

        faAnimations.Keys.CopyTo(sKeys, 0);

        CurrentAnimation = sKeys[0];

      }

      else

      {

        return;

      }

    }

    // If the current animation has played more than once

    if (CurrentFrameAnimation.PlayCount > 0)

    {

      // Update damge

      bDamage = true;

      // Check to see if there is a "followup" animation named for this animation

      if (!String.IsNullOrEmpty(CurrentFrameAnimation.NextAnimation))

      {

        // If it has, set up the next animation

        CurrentAnimation = CurrentFrameAnimation.NextAnimation;

      }
      // Else, set next animation to default
      else

      {

        string[] sKeys = new string[faAnimations.Count];

        faAnimations.Keys.CopyTo(sKeys, 0);

        CurrentAnimation = sKeys[0];
      }

    }

    else // Else, if it hasn't played more than once

      bDamage = false; // reset damage

    CurrentFrameAnimation.Update(gameTime);

  }

}

#endregion

#region Draw

public void Draw(SpriteBatch spriteBatch, int XOffset, int YOffset)

{

  if (bAnimating)

  {
    // set default direction to RIGHT

    SpriteEffects spriteEffect = SpriteEffects.None;
    // If player is facing LEFT

    if (flipImage == 1)

    {
      // flip the sprite image to face LEFT

      spriteEffect = SpriteEffects.FlipHorizontally;

    }

    spriteBatch.Draw(t2dTexture,
          (v2Position + new Vector2(XOffset, YOffset) + v2Center),

            CurrentFrameAnimation.FrameRectangle, colorTint,

            fRotation, v2Center, fScale, spriteEffect, 0);

  }

}

#endregion