Difference between revisions of "Game Programming Class2"

Revision as of 19:08, 31 January 2010

Fonts

free game fonts XNA Redistributable Font Pack

Fun with Fonts in XNA

in class

Spritefont demo

IntroFonts/Game1.cs IntroFonts.zip

XNA Structures

Game Class

The XNA Game class has two private properties

• GraphicsDeviceManager graphics;
• ContentManager content;

//the game constuctor can be used to set some graphics settings.
graphics.PreferredBackBufferHeight = 768;
graphics.PreferredBackBufferWidth = 1024;
//graphics.PreferredBackBufferHeight = 1080;
//graphics.PreferredBackBufferWidth = 1920;
//graphics.IsFullScreen = true;

1. Declare SpriteBatch spriteBatch;
2. Initialize()
3. LoadContent()
4. UnloadContent()
5. Update(GameTime gameTime)

GameTime

FrameRate and GameTime

• Game Loop Timing
• Game Time Members

Time and Timespan

Example of update using GameTime to calculate elapsed time

• IntroSimpleSpriteUpdateWindows.zip
• IntroSimpleSpriteWindows/Game1.cs

Understanding GameTime We'll revisit game time when we talk about performance profiling.

1. Draw(GameTime gameTime)

Console And Trace

We will build a console class later and debug in game.

Texture2D and SpriteBatches

2D Graphics Overview

About textures and Batching

Displays, ViewPorts, Client Bounds

Alpha channels

Demo

• Gimp
• Paint.NET

SpriteBacth

demo project

• IntroSimpleSpriteBatchOptionsWindows.zip

spriteBatch.Begin();

1. Options SpriteBlendMode
2. Additive Enable additive blending. http://blogs.msdn.com/etayrien/archive/2006/12/19/alpha-blending-part-3.aspx
3. AlphaBlend Enable alpha blending. http://blogs.msdn.com/etayrien/archive/2006/12/19/alpha-blending-part-2.aspx
4. None No blending specified.

Other Projects

IntroSimpleSpriteUpdateGravityWindows.zip IntroSimpleSpriteUpdateWindows.zip

Inclass Keyboard input demo

KeyboardState keyboardState = Keyboard.GetState();

Homework

• XNA Picture With Update

Update you picture to include some movement with the update method.

• Sprite Class

Build a class that is reusable that can draw a single texture on the screen. Be sure to encapsulate all the properties and method that you need to draw the sprite.

• Read Chapter 2 in XNA 3.0
• Read Chapter 4 in XNA 3.0 (yes we skipped 3 we'll come back)

Links

• How To: Draw a Sprite
• How To: Animate a Sprite
• How To: Draw a Masked Sprite over a Background
• How To: Make a Scrolling Background
• How To: Rotate a Sprite
• How To: Rotate a Group of Sprites
• How To: Scale a Sprite
• How To: Tint a Sprite
• How To: Scale Sprites Based On Screen Size