0.17 Xna0132-a simple game program with on-screen text

Revised: Tue May 10 11:37:12 CDT 2016

This page is part of a Book titled XNA Game Studio .

Table of Contents

• Table of Contents
• Preface
  • Viewing tip
    • Figures
    • Listings
• General background information
• Preview
  • Spider behavior
  • The ladybugs
  • Using the keyboard
  • Using the mouse
  • Difficulty level
  • A useful student project
  • Alternatives to the arrow keys
• Discussion and sample code
  • How to draw on-screen text
    • Font availability
      • Identifying the font families
      • Matching font families to font files
    • Getting ready to draw on-screen text
    • Drawing the on-screen text
    • The project named XNA0132ProjA
      • The overridden Game.Draw method
      • The SpriteBatch.DrawString method
        • Purpose of the origin parameter
        • All I need to say
  • The Sprite class for XNA0132Proj
    • The new code
    • A new read-only property accessor method for the Edge property
    • New version of the Move method
    • End of discussion of the Sprite class
  • The Game1 class for XNA0132Proj
    • General information
      • The objective of the game
      • Ladybug control
      • Spiders are recycled
      • Keeping score
    • Code for the Game1 Class
      • The overridden LoadContent method
        • The font family
        • Make the mouse pointer visible
        • Position the on-screen text
        • Set the initial position of the mouse pointer
        • End of the LoadContent method
      • The overridden Update method
        • Moving the ladybug objects using the keyboard
        • Dragging the ladybug objects with the mouse
      • The overridden Game.Draw method
        • The MeasureString method
        • Overloaded division operator
    • The end of the program
• Run the program
• Run my text program
• Run my game program
• Summary
• What's next?
• Miscellaneous
• Complete program listing

Preface

This module is one in a collection of modules designed primarily for teaching GAME 1343 Game and Simulation Programming I at Austin Community College in Austin, TX. These modules are intended tosupplement and not to replace the textbook.

An earlier module titled Getting Started provided information on how to get started programming with Microsoft's XNA Game Studio.

Viewing tip

I recommend that you open another copy of this module in a separate browser window and use the following links to easily find and view the Figuresand Listings while you are reading about them.

Figures

• Figure 1 . Reduced view of the game window.
• Figure 2 . Information on fonts from the XNA documentation.
• Figure 3 . Correspondence between font-family names and font file names.
• Figure 4 . Demonstration of on-screen text with the Lindsey font.

Listings

• Listing 1 . Beginning of the Game1 class and the overridden LoadContent method for the project named XNA0132ProjA.
• Listing 2 . Beginning of the overridden Game.Draw method.
• Listing 3 . Remainder of the overridden Game.Draw method.
• Listing 4 . A new read-only property accessor method for the Edge property for the Sprite class.
• Listing 5 . New version of the Move method.
• Listing 6 . Abbreviated beginning of the Game1 Class for the XNA0132Proj project.
• Listing 7 . Abbreviated overridden LoadContent method.
• Listing 8 . Beginning of an abbreviated overridden Update method.
• Listing 9 . Service the keyboard.
• Listing 10 . Moving the ladybug objects with the mouse.
• Listing 11 . The overridden Game.Draw method.
• Listing 12 . Game1 class for project XNA0132ProjA.
• Listing 13 . Sprite class for project XNA0132Proj.
• Listing 14 . Game1 class for project XNA0132Proj.