Book Image

Cocos2d for iPhone 1 Game Development Cookbook

By : Nathan Burba
Book Image

Cocos2d for iPhone 1 Game Development Cookbook

By: Nathan Burba

Overview of this book

Cocos2d for iPhone is a robust but simple-to-use 2D game framework for iPhone. It is easy to use, fast, flexible, free, and Appstore approved. More than 2500 AppStore games already use it, including many best-seller games. Do you want to take your cocos2d game development skills to the next level and become more professional in cocos2d game design? Cocos2d for iPhone 1 Game Development Cookbook will help you reach that next level. You will find over 100 recipes here that explain everything from the drawing of a single sprite to AI pathfinding and advanced networking. Full working examples are emphasized. Starting with the first chapter, Graphics, you will be taken through every major topic of game development. You will find both simple and complex recipes in the book. Each recipe is either a solution to a common problem (playing video files, accelerometer steering) or a cool advanced technique (3D rendering, textured polygons). This cookbook will have you creating professional quality iOS games quickly with its breadth of working example code.
Table of Contents (15 chapters)
Cocos2d for iPhone 1 Game Development Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Simulating bullets


Bullets and other fast moving objects are a fundamental part of many video games. In this recipe, we will see how to properly implement bullet physics.

Getting ready

Please refer to the project RecipeCollection02 for full working code of this recipe. Also note that some of the following code has been omitted for brevity.

How to do it...

Execute the following code:

@implementation Ch4_Bullets

/* Fire the gun */
-(void) fireGun {
  //Fire 10 bullets per second
  if(fireCount > 0){
    return;
  }
  fireCount = 0.2f;

  CCSpriteFrameCache *cache = [CCSpriteFrameCache sharedSpriteFrameCache];

  //Fire bullet in the correct direction
  float gunAngle = -gunman.body->GetAngle() + PI/2;
  if(gunmanDirection == DPAD_LEFT){ gunAngle += PI; }
  CGPoint bulletVector = ccp( sin(gunAngle), cos(gunAngle) );

  //Create bullet and shell casing
  for(int i=0; i<2; i++){
    //Create bullet or casing object
    //NOTE: It might be more efficient to re-use a group of bullet objects...