3. Understanding Game Physics | Building Android Games with Cocos2d-x

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Building Android Games with Cocos2d-x

By : Hernandez

4.3 (8)

Building Android Games with Cocos2d-x

4.3 (8)

By: Hernandez

Overview of this book

If you have a basic understanding of the C++ programming language and want to create videogames for the Android platform, then this technology and book is ideal for you.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Setting Up Your Development Environment

1. Setting Up Your Development Environment

Cocos2d-x overview

Setting up Java

Setting up the Android SDK

Setting up the Android Native Development Kit

Setting up Apache Ant

Setting up Python

Setting up Cocos2d-x

Template code walk-through

Summary

2. Graphics

2. Graphics

Creating scenes

Pausing the game

Understanding nodes

Understanding sprites

Understanding actions

Animating sprites

Game menus

Putting everything together

Summary

3. Understanding Game Physics

3. Understanding Game Physics

Setting up the physics world

Collision detection

Handling gravity

Putting everything together

Summary

4. User Input

4. User Input

Understanding the Event Dispatcher mechanism

Handling the touch event

Handling accelerometer events

Keeping the screen alive

Handling the Android back key pressed event

Putting everything together

Summary

5. Handling Text and Fonts

5. Handling Text and Fonts

Creating TrueType font labels

Creating system fonts

Creating bitmap font labels

Putting everything together

Summary

6. Audio

6. Audio

Playing background music and sound effects

Modifying audio properties

The new audio engine

Adding a mute button to our game

Putting everything together

Summary

7. Creating Particle Systems

7. Creating Particle Systems

Creating collections of the Cocos2d-x objects

Adding particle systems to our game

Configuring the particle systems

Creating customized particle systems

Putting everything together

Summary

8. Adding Native Java Code

8. Adding Native Java Code

Understanding the Cocos2d-x structure for the Android platform

Understanding the JNI capabilities

Adding Java code to the Cocos2d-x game

Adding ads to the game by inserting Java code

Configuring the environment

Modifying the Android manifest

Putting everything together

Summary

Index

Index

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Collision detection

First, let us implement our onCollision instance method. This is going to be called each time a collision between two physics bodies is detected. As we can see in the following code, when the bomb physics body collides with our player, it makes the bomb invisible:

bool HelloWorld::onCollision(PhysicsContact& contact){
  _sprBomb->setVisible(false);
  return false;
}

Note

This is a good place for putting some logs during the development process in order to find out when the collisions are being detected. In Cocos2d-x 3.4 you can print the log messages using the CCLOG macro. This could be turned on by defining the macro COCOS2D_DEBUG as follows: #define COCOS2D_DEBUG 1.

As we can see, this method returns a Boolean value. It indicates whether these two bodies can collide again. In this particular case, we will return false, indicating that as soon as these two physics bodies collide they should not continue to collide. If we return the true indication, then these two...

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