Difference between revisions of "Game Programming Class5"

Revision as of 03:28, 6 October 2015

Game Services

Review Game Components

• Sprite
• DrawableSprite

IntroGameLibrary

Turn the console class into a service

Each GameService needs to have a unique interface so that there is an entry in the system types table. The interface allows the game to return the correct type.

• GameConsole.cs

All of these files are available in the IntoGameLibrary Project in the classfolders.

Input Controller Mongame

from project IntroPacManMovementController file PacManController.cs

https://iam.colum.edu:8443/!/#GPMonogame3/view/head/trunk/jeff/IntroPacManMovementController/PacManController.cs

<csharp> InputHandler input; //game service to handle input public Vector2 Direction {get; private set;} ...

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() //update accesses InputHandler

       {
           //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

... </csharp>

The MonoGamePacMan game component then uses the controller

https://iam.colum.edu:8443/!/#GPMonogame3/view/head/trunk/jeff/IntroPacManMovementController/MonoGamePacMan.cs

<csharp> internal PacManController controller { get; private set; } ... public MonoGamePacMan(Game game)

           : base(game)
       {
           this.controller = new PacManController(game);
           ...
        }

... 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;

...

</csharp>

Input Controller Unity

PlayerController from https://iam.colum.edu:8443/!/#GPMonogame3/view/head/trunk/jeffUnity/UnityGameDemos/Assets/Scripts/PacMan/PlayerController.cs

<csharp> public Vector2 direction = new Vector2();

   private Vector2 keyDirection;
   private Vector2 padDirection;

... void Update () {

       HandleKeyboard();

       HandleGamepad();

...

private void HandleGamepad()

   {
       //Gamepad
       padDirection.x = padDirection.y = 0;
       //and keyboard unity already sums them together
       padDirection.x = Input.GetAxis("Horizontal");
       padDirection.y = Input.GetAxis("Vertical");

       if (padDirection.magnitude > 0)
       {
           //Debug.Log(padDirection + " " + padDirection.magnitude + " " + (padDirection.magnitude > 0));
           direction += padDirection;
       }
   }

</csharp>

Player.cs from https://iam.colum.edu:8443/!/#GPMonogame3/view/head/trunk/jeffUnity/UnityGameDemos/Assets/Scripts/PacMan/Player.cs

<csharp> private PlayerController controller;

   public Vector2 Direction = new Vector2(1, 0);

... void Start()

   {
       //Get PlayerController from game object
       controller = GetComponent<PlayerController>();
       //Log error if controller is null will throw null refernece exception eventually
       if (controller == null)
       {
           Debug.LogWarning("GetComponent of type " + typeof(PlayerController) + " failed on " + this.name, this);
       }

...

// Update is called once per frame

   void Update()
   {
       //Check for input from PlayerController
       if (this.controller.hasInputForMoverment)
       {
           this.Direction = this.controller.direction; //Get Direction from PlayerController

</csharp>

Advanced Sprites/Collision

Simple Collision

Check if two rectangles intersect. By adding a rectangle that represents the area of the sprite it's easy to ask XNA if two rectangles intersect

3 tutorial on App Hub

• http://xbox.create.msdn.com/en-us/education/catalog/tutorial/collision_2d_rectangle
• http://xbox.create.msdn.com/en-US/education/catalog/tutorial/collision_2d_perpixel
• http://xbox.create.msdn.com/en-US/education/catalog/tutorial/collision_2d_perpixel_transformed

PerPixelCollision

Load both textures into a color array. Make a rectangle of the intersection of the two textures. Check all the pixels in intersection of the color arrays for intersecting pixels.

The definition for both methods is in the Sprite class (Sprite.cs)

Chase and Evade

Example of simple states and simple vector geometry.

Better example not yet implemented

PacMan Chase and Evade example in repo IntroChaseEvade demostratea

• Collision
• State for feeble AI
• Sprite Markers

Homework

InputControllerMonogame

InputControllerUnity