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Android Game Programming By Example

Android Game Programming By Example

By : John Horton
4.4 (9)
Buy this Book
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Android Game Programming By Example

Android Game Programming By Example

4.4 (9)
By: John Horton
Buy this Book

Overview of this book

The book is best suited for existing Android or Java programmers who want to adapt their skills to make exciting Android games. The book is also for determined readers who might have no Android, game programming or even Java experience, but a reasonable understanding of object oriented programming knowledge is assumed.
Table of Contents (13 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Player 1 UP
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1. Player 1 UP
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A closer look at the games
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Setting up your development environment
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Summary
2
2. Tappy Defender – First Step
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2. Tappy Defender – First Step
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Planning the first game
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Building the home screen
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Coding the game loop
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The PlayerShip object
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Drawing the scene
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Deploying the game
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Summary
3
3. Tappy Defender – Taking Flight
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3. Tappy Defender – Taking Flight
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Controlling the spaceship
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Building the enemies
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The thrill of flight – scrolling the background
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Things that go bump – collision detection
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Summary
4
4. Tappy Defender – Going Home
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4. Tappy Defender – Going Home
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Displaying a HUD
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Implementing the rules
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Ending the game
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Adding sound FX
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Adding persistence
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Iteration
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The finished game
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Summary
5
5. Platformer – Upgrading the Game Engine
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5. Platformer – Upgrading the Game Engine
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The game
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Upgrading the game engine
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Summary
6
6. Platformer – Bob, Beeps, and Bumps
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6. Platformer – Bob, Beeps, and Bumps
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The SoundManager class
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Introducing Bob
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Multiphase collision detection
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Player input
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Animating Bob
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Summary
7
7. Platformer – Guns, Life, Money, and the Enemy
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7. Platformer – Guns, Life, Money, and the Enemy
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Ready aim fire
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Summary
8
8. Platformer – Putting It All Together
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8. Platformer – Putting It All Together
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Bullet collision detection
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Adding some fire tiles
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Eye candy
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Summary
9
9. Asteroids at 60 FPS with OpenGL ES 2
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9. Asteroids at 60 FPS with OpenGL ES 2
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Asteroids simulator
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Introducing OpenGL ES 2
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Preparing OpenGL ES 2
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Building an OpenGL-friendly, GameObject super class
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The spaceship
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Drawing at 60 + FPS
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Summary
10
10. Move and Draw with OpenGL ES 2
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10. Move and Draw with OpenGL ES 2
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Drawing a static game border
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Twinkling stars
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Bringing the spaceship to life
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Rapid fire bullets
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Reusing existing classes
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Drawing and moving the asteroids
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Scores and the HUD
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Summary
11
11. Things That Go Bump – Part II
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11. Things That Go Bump – Part II
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Planning for collision detection
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Performing the checks
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Precise collision detection with the border
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Precise collision detection with an asteroid
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Finishing touches
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Summary
12
Index
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Index

Precise collision detection with the border

To upgrade our detect method, we need to replace the return statement in the if(possibleCollision) block with the more precise detection code.

First, initialize radianAngle to be the radian equivalent of whichever direction (in degrees) our object is facing. The Math class uses radians as they are more mathematically useful in calculations than the easier to visualize degree measurement.

The variables cosAngle and sinAngle are just what the name suggests, and are used in the block of code which follows this one.

Tip

It is worth mentioning that the Math.cos() and Math.sin() methods are relatively time consuming. We can speed up our collision detection class by precomputing 360 values for both sin and cos and then using a simple lookup method instead of this calculation.

However, we maintain our goal of over 60 frames per second, so don't do so here.

Delete the return statement and add this code in the if(possibleCollision) block:

if (possibleCollision...
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Android Game Programming By Example
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