8. Defend the Tower | Cocos2d Game Development Blueprints

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Cocos2d Game Development Blueprints

By : Jorge Jordán

5 (2)

Cocos2d Game Development Blueprints

5 (2)

By: Jorge Jordán

Overview of this book

Whether you are a passionate gamer, like developing, or are just curious about game development, this book is for you. The book has been written to teach 2D game development to app developers and to teach Objective-C to game developers, as learning Cocos2d is the perfect step for both roles.

Preface

Preface

Cocos2d v3.0

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Sprites, Sounds, and Collisions

1. Sprites, Sounds, and Collisions

Creating a new Cocos2d project

Run Xcode Run

CCNode

Your first game – RunYetiRun

1-star challenge – accurate collision detection

2-star challenge – having three lives

Summary

2. Explosions and UFOs

2. Explosions and UFOs

Handling the accelerometer input

Implementing the parallax effect in Cocos2d

Particle systems

Extending CCSprite

2-star challenge – create explosions

Drawing and coloring

1-star challenge – collision detection between Dr. Fringe and the UFO

Summary

3. Your First Online Game

3. Your First Online Game

Getting started with our project

Initializing the game

Creating labels with CCLabelBMFont

CCActions in depth

Drag, drop, and scale

Game Center

Summary

4. Beat All Your Enemies Up

4. Beat All Your Enemies Up

Creating an iPad-only game

Developing virtual game controls

Moving the zombie

CCSpriteBatchNode

Texture atlases

Creating your first animation

3-star challenge – hitting the air

Creating the zombie class

Creating the human enemies class

Keeping the main character in view

Taking human decisions

Drawing a life bar

Detecting collisions with enemies

2-star challenge – enemies' life bar

Game over

Summary

5. Scenes at the Highest Level

5. Scenes at the Highest Level

Initializing the game

Developing a tutorial for our game

Storing data using NSUserDefault

Loading data from external files

Transitions

3-star challenge – create a map scene

Summary

6. Physics Behavior

6. Physics Behavior

Physics engines

Game physics in Cocos2d

Introducing Chipmunk

Creating your first physics

Creating sprites with physics

Defining shapes

Advanced collision detection with Chipmunk

Creating a snooker game with Chipmunk

Summary

7. Jump and Run

7. Jump and Run

Initializing the game

Configuring a varied scene

Scrolling the background and blocks

Coding custom physics

Adding a menu to the game

2-star challenge – adding pinecones to the scene

1-star challenge – adding a score label

Summary

8. Defend the Tower

8. Defend the Tower

Initializing the game

Developing a pathfinding algorithm

Predefining defensive positions

Placing defenses

Giving AI to the defenses

Sharing information between nodes

Loading waves of enemies

2-star challenge – adding explosions

3-star challenge – upgrading defenses

Summary

Index

Index

Developing a pathfinding algorithm

One way to provide nodes with intelligence is to predefine their behavior in response to external stimuli, or to give them a goal to reach.

In this case, we are going to make our enemies follow a path, which we will subdivide into steps. For this purpose, let's create a new class by following these steps:

Right-click on the Classes group in the project navigator and select New File….
Click on iOS | cocos2d v3.x | CCNode class and make this class a subclass of CCNode.
Call it PathStep and click on Create.

Replace the contents of PathStep.h with the following lines:

#import <Foundation/Foundation.h>
#import "cocos2d.h"

@interface PathStep : CCNode {
    
}

// Property for the next step
@property (nonatomic, assign) PathStep *nextPathStep;
// Property for the sprite
@property (readwrite, nonatomic) CCSprite *pathStepSprite;

// Init method
- (PathStep *) initWithPosition:(CGPoint)position;

@end

We are extending the class from CCNode because we need it to...

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Programming languages

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