4. Collision Detection and Scoring | Learning Cocos2d-x Game Development

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Learning Cocos2d-x Game Development

By : Siddharth Shekar

3 (1)

Learning Cocos2d-x Game Development

3 (1)

By: Siddharth Shekar

Overview of this book

If you are a hobbyist, novice game developer, or programmer who wants to learn about developing games/apps using Cocos2d-x, this 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. Getting Started

1. Getting Started

Downloading and installing Visual Studio

Downloading and installing the Windows Phone SDK

Downloading and installing Python

Downloading Cocos2d-x

Creating a new project

Coordinate system

Basic classes of Cocos2d-x

Project breakup

Running the project on multiple platforms

Summary

2. Displaying the Hero and Controls

2. Displaying the Hero and Controls

First things first

Displaying the background image

Character movement

Enabling the touch function

Enabling multitouch

Movement with touches

Movement with the accelerometer

Custom controls

Summary

3. Enemies and Controls

3. Enemies and Controls

Creating the enemy class

Adding the gameplay layer

Creating the projectile class

Adding hero controls

Summary

4. Collision Detection and Scoring

4. Collision Detection and Scoring

Theory of collision detection

Coding collision detection

Keeping track of the score and the game over condition

Storing high scores

Summary

5. HUD, Parallax Background, and the Pause Button

5. HUD, Parallax Background, and the Pause Button

Texts and fonts

Creating the HUD layer and displaying as well as updating scores

Creating the pause button and showing the pause screen

Implementing pause and resuming the game

Adding the scrolling layer class

Creating the parallax scrolling layer

Summary

6. Animations

6. Animations

Animation basics

TexturePacker

Creating a spritesheet for the player

Coding the player animation

Creating and coding enemy animation

Creating the skeletal animation

Coding the player walk cycle

Summary

7. Particle Systems

7. Particle Systems

What is a particle system?

Cocos2d-x's inbuilt particle system

Adding the gun muzzle particle system

Adding an explosion particle system

Adding particles for jetpack when a player moves upwards

Creating your own particle system

Summary

8. Adding Main and Option Menu Scenes

8. Adding Main and Option Menu Scenes

Creating the main menu scene

Loading the menu scene at start of the app

Creating the Options scene

Changing the name of the app

Summary

9. Adding Sounds and Effects

9. Adding Sounds and Effects

Audio in Cocos2d-x

Adding looped background music

Adding sound effects

Adding the mute button

Summary

10. Publishing to the Windows Phone Store

10. Publishing to the Windows Phone Store

A look at the Windows Phone Store

Creating the store account

Preparing/creating the app

Creating the app and setting pricing

Uploading the XAP file, icons, and screenshots for review

Summary

11. Porting, References, and Final Remarks

11. Porting, References, and Final Remarks

Running the game on the Windows desktop

Running the game on the Android simulator using the Eclipse IDE

Running on the BlackBerry simulator using the Momentics IDE

Running on an iOS simulator using Xcode

Additional learning resources

Final remarks and a thank you note

Index

Index

Customer Reviews

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Coding collision detection

To detect collision, we add a new function in the GameplayLayer class that will detect collision between two CCSprites and return a value after checking whether the collision occurred or not.

Add the following to the GameplayLayer.h file:

bool checkBoxCollision(CCSprite* box1, CCSprite *box2);

And at the end of GameplayLayer.cpp, add the following:

bool GameplayLayer::checkBoxCollision(CCSprite* box1, CCSprite *box2)
{
    CCRect box1Rect = box1->boundingBox();
      
    
    CCRect box2Rect = box2->boundingBox();
    
    
    if (box1Rect.intersectsRect(box2Rect))
    {
        return true;
    }
    else
    {
        return false;
    }
}

This code gets the two sprites that are given to it, and then for each of the sprites, it builds a collision box depending upon the position, width, and height of the object.

CCRect has an inbuilt function, which we can use if one rectangle is touching the other rectangle. If it interacts, we return true, and if it doesn...

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