Game Programming Class6
esse quam videri
Contents
Physics
c# Box2D https://code.google.com/p/box2dx/
https://github.com/d-snp/Farseer-Physics
http://farseerphysics.codeplex.com/
Portability
Separation of Concerns
- https://msdn.microsoft.com/en-us/library/ee658124.aspx
- http://en.wikipedia.org/wiki/Separation_of_concerns
Single Responsibility Principle
- http://en.wikipedia.org/wiki/Single_responsibility_principle
- http://www.butunclebob.com/ArticleS.UncleBob.PrinciplesOfOod
PacMan Class Simplified and Generalized
<csharp> public enum PacManState { Spawning, Still, Chomping, SuperPacMan }
public class PacMan
{
protected PacManState _state;
public PacManState State
{
get { return _state; }
set
{
if (_state != value)
{
this.Log(string.Format("{0} was: {1} now {2}", this.ToString(), _state, value));
_state = value;
}
}
}
public PacMan()
{
//Set default state will call notify so make sure this.Ghosts is intitialized first
this.State = PacManState.Still;
}
//Extra method for logging state change
public virtual void Log(string s)
{
//nothing
Console.WriteLine(s);
}
}
</csharp>
MovementController in Monogame
In MonogameDemos Project is IntroPacManMovementController
file is PacManController.cs
<csharp> sealed class PacManController
{
InputHandler input; //game service to handle input
public Vector2 Direction {get; private set;}
public float Rotate { get; private set;}
//Checks to see if there is anymovement
public bool hasInputForMoverment
{
get
{
if (Direction.Length() == 0) return false;
return true;
}
}
public PacManController(Game game)
{
//get input handler from game services
input = (InputHandler)game.Services.GetService<IInputHandler>();
if (input == null)
{
throw new Exception("PacMan controller depends on InputHandler service please add Input Handler as a service first");
}
}
public void Update()
{
//Input for update from analog stick
GamePadState gamePad1State = input.GamePads[0]; //HACK hard coded player index
#region LeftStick
Vector2 pacStickDir = Vector2.Zero;
if (gamePad1State.ThumbSticks.Left.Length() > 0.0f)
{
pacStickDir = gamePad1State.ThumbSticks.Left;
pacStickDir.Y *= -1; //Invert Y Axis
float RotationAngle = (float)Math.Atan2(
gamePad1State.ThumbSticks.Left.X,
gamePad1State.ThumbSticks.Left.Y);
Rotate = (float)MathHelper.ToDegrees(RotationAngle - (float)(Math.PI / 2));
}
#endregion
//Update for input from DPad
#region DPad
Vector2 PacManDPadDir = Vector2.Zero;
if (gamePad1State.DPad.Left == ButtonState.Pressed)
{
//Orginal Position is Right so flip X
PacManDPadDir += new Vector2(-1, 0);
}
if (gamePad1State.DPad.Right == ButtonState.Pressed)
{
//Original Position is Right
PacManDPadDir += new Vector2(1, 0);
}
if (gamePad1State.DPad.Up == ButtonState.Pressed)
{
//Up
PacManDPadDir += new Vector2(0, -1);
}
if (gamePad1State.DPad.Down == ButtonState.Pressed)
{
//Down
PacManDPadDir += new Vector2(0, 1);
}
if (PacManDPadDir.Length() > 0)
{
//Angle in radians from vector
float RotationAngleKey = (float)Math.Atan2(
PacManDPadDir.X,
PacManDPadDir.Y * -1);
//Find angle in degrees
Rotate = (float)MathHelper.ToDegrees(
RotationAngleKey - (float)(Math.PI / 2)); //rotated right already
//Normalize NewDir to keep agled movement at same speed as horilontal/Vert
PacManDPadDir = Vector2.Normalize(PacManDPadDir);
}
#endregion
//Update for input from Keyboard
- if !XBOX360
#region KeyBoard
KeyboardState keyboardState = Keyboard.GetState();
Vector2 PacManKeyDir = new Vector2(0, 0);
if (keyboardState.IsKeyDown(Keys.Left))
{
//Flip Horizontal
PacManKeyDir += new Vector2(-1, 0);
}
if (keyboardState.IsKeyDown(Keys.Right))
{
//No new sprite Effects
PacManKeyDir += new Vector2(1, 0);
}
if (keyboardState.IsKeyDown(Keys.Up))
{
PacManKeyDir += new Vector2(0, -1);
}
if (keyboardState.IsKeyDown(Keys.Down))
{
PacManKeyDir += new Vector2(0, 1);
}
if (PacManKeyDir.Length() > 0)
{
float RotationAngleKey = (float)Math.Atan2(
PacManKeyDir.X,
PacManKeyDir.Y * -1);
Rotate = (float)MathHelper.ToDegrees(
RotationAngleKey - (float)(Math.PI / 2));
//Normalize NewDir to keep agled movement at same speed as horilontal/Vert
PacManKeyDir = Vector2.Normalize(PacManKeyDir);
}
#endregion
- endif
Direction= PacManKeyDir + PacManDPadDir + pacStickDir;
if (Direction.Length() > 0)
{
Direction = Vector2.Normalize(Direction);
}
}
}
</csharp>
GameConsolePacMan.cs //hadles logging <csharp> class GameConsolePacMan : PacMan
{
GameConsole console;
public GameConsolePacMan()
{
this.console = null;
}
public GameConsolePacMan(GameConsole console)
{
this.console = console;
}
public override void Log(string s)
{
if (console != null)
{
console.GameConsoleWrite(s);
}
else
{
base.Log(s);
}
}
}
</csharp>
MonoGamePacMan.cs <csharp> class MonoGamePacMan : IntroGameLibrary.Sprite2.DrawableSprite2
{
internal PacManController controller { get; private set; }
internal GameConsolePacMan PacMan
{
get;
private set;
}
protected PacManState pacState;
public PacManState PacState
{
get { return this.pacState; }
//Change pacman state also
set {
if(this.pacState != value)
this.pacState = this.PacMan.State = value;
}
}
public MonoGamePacMan(Game game)
: base(game)
{
this.controller = new PacManController(game);
PacMan = new GameConsolePacMan((GameConsole)game.Services.GetService<IGameConsole>());
}
protected override void LoadContent()
{
base.LoadContent();
this.SpriteTexture = content.Load<Texture2D>("PacManSingle");
this.Orgin = new Vector2(this.SpriteTexture.Width / 2, this.SpriteTexture.Height / 2);
this.Location = new Microsoft.Xna.Framework.Vector2(100, 100);
this.Speed = 200;
}
public override void Update(GameTime gameTime)
{
//Elapsed time since last update
float time = (float)gameTime.ElapsedGameTime.TotalMilliseconds;
this.controller.Update();
this.Location += ((this.controller.Direction * (time / 1000)) * Speed); //Simple Move
this.Rotate = this.controller.Rotate;
//Change State based on movement
if (this.controller.hasInputForMoverment)
{
if(pacState != PacManState.Spawning && pacState != PacManState.SuperPacMan)
this.PacState = PacManState.Chomping;
}
else
{
if (pacState != PacManState.Spawning && pacState != PacManState.SuperPacMan)
this.PacState = PacManState.Still;
}
//Keep PacMan On Screen
if (this.Location.X > Game.GraphicsDevice.Viewport.Width - (this.spriteTexture.Width / 2))
{
this.Location.X = Game.GraphicsDevice.Viewport.Width - (this.spriteTexture.Width / 2);
}
if (this.Location.X < (this.spriteTexture.Width / 2))
this.Location.X = (this.spriteTexture.Width / 2);
if (this.Location.Y > Game.GraphicsDevice.Viewport.Height - (this.spriteTexture.Height / 2))
this.Location.Y = Game.GraphicsDevice.Viewport.Height - (this.spriteTexture.Height / 2);
if (this.Location.Y < (this.spriteTexture.Height / 2))
this.Location.Y = (this.spriteTexture.Height / 2);
base.Update(gameTime);
}
}
</csharp>
MovementController in Unity
Unity Project is GameProgrammingUnity
Package is PacManWithFood.unitypackage
script is PlayerController.cs <csharp>
public class PlayerController : MonoBehaviour {
public Vector2 direction = new Vector2();
private Vector2 keyDirection; private Vector2 padDirection;
public bool hasInputForMoverment { get {
//Debug.Log(direction.sqrMagnitude);
if (direction.magnitude == 0) return false;
return true;} }
public PlayerController()
{
keyDirection = new Vector2();
}
// Use this for initialization void Start () {
}
// Update is called once per frame void Update () {
keyDirection.x = keyDirection.y = 0;
//Keyboard
if (Input.GetKey("right"))
{
keyDirection.x += 1;
}
if (Input.GetKey ("left")) {
keyDirection.x += -1;
}
if (Input.GetKey("up"))
{
keyDirection.y += 1;
}
if (Input.GetKey ("down")) {
keyDirection.y += -1;
}
direction = keyDirection;
//Gamepad
padDirection.x = Input.GetAxis("Horizontal");
padDirection.y = Input.GetAxis("Vertical");
if (padDirection.magnitude > 0)
{
//Debug.Log(padDirection + " " + padDirection.magnitude + " " + (padDirection.magnitude > 0));
direction += padDirection;
}
//normalize
direction.Normalize();
} } </csharp>
UnityPacMan.cs //Hadles logging <csharp> public class UnityPacMan : PacMan {
private GameObject _gameObject;
public UnityPacMan(GameObject g) : base()
{
_gameObject = g;
}
public override void Log(string s)
{
Debug.Log(s);
}
} </csharp>
Simple Animation
what extra fields do we need for animation?
http://create.msdn.com/en-US/education/catalog/sample/sprite_sheet
Platformer Example
Show platformer starter kit
http://msdn.microsoft.com/en-us/library/dd254918(v=xnagamestudio.31).aspx
simple and elegant but not that flexible
Animation Classes
Way too many classes for me to type here
- PacMan States
- PacMan Dying Animation
- PacMan Eating
IntroAnimation Project IntroAnimation.zip
Complicated but flexible
- DrawableAnimatableSprite.cs
- CelAnimationManager.cs
Homework
Shooting Game
- must use game components
- must be multiplayer (both on keyboard or multiple game pads) don't use networking
- must be able to shoot at each other or work together to shoot enemies
- include shot manager and or shot manager
