https://github.com/pjvds/iPong

Simple pong game running on IOS using ObjC and Cocos2D Box2D
https://github.com/pjvds/iPong

Last synced: about 1 month ago
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Simple pong game running on IOS using ObjC and Cocos2D Box2D

• Host: GitHub
• URL: https://github.com/pjvds/iPong
• Owner: pjvds
• License: zlib
• Created: 2011-03-21T21:43:23.000Z (over 13 years ago)
• Default Branch: master
• Last Pushed: 2011-04-05T20:18:06.000Z (over 13 years ago)
• Last Synced: 2024-04-08T15:51:53.065Z (8 months ago)
• Language: Objective-C
• Homepage:
• Size: 874 KB
• Stars: 95
• Watchers: 15
• Forks: 51
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.box2d

Awesome Lists containing this project

• awesome - iPong - Simple pong game running on IOS using ObjC and Cocos2D Box2D (etc)
• awesome - iPong - Simple pong game running on IOS using ObjC and Cocos2D Box2D (etc)

README

        
# iPong

A simple pong implementation that runs on IOS.

# Tech stuff

The following stuff is used to create this Pong implementation for IOS:

* XCode 4.x

* Objective C

* Cocos2D

* Box2D

* Freetime in an hotel in Rotterdam

# Project structure

All real logic and non scaffolding code can be found in three classes.

## iPongLayer

Main entry point. Bootstraps all the game objects and is the layer where the game is drawn on. It also holds and manages the game score.

## Paddle

The paddle game object. Contains logic to move itself on touch.

## Ball

The ball game object. It contains logic to respawn.

# What you need to know about Box2D

Box2D works with several fundamental objects. We briefly define these objects here and more details are given later in this document.

## world

A physics world is a collection of bodies, fixtures, and constraints that interact together. Box2D supports the creation of multiple worlds, but this is usually not necessary or desirable.

## shape

A 2D geometrical object, such as a circle or polygon.

## rigid body

A chunk of matter that is so strong that the distance between any two bits of matter on the chunk is completely constant. They are hard like a diamond. In the following discussion we use body interchangeably with rigid body.

## fixture

A fixture binds a shape to a body and adds material properties such as density, friction, and restitution.

## constraint

A constraint is a physical connection that removes degrees of freedom from bodies. In 2D a body has 3 degrees of freedom (two translation coordinates and one rotation coordinate). If we take a body and pin it to the wall (like a pendulum) we have constrained the body to the wall. At this point the body can only rotate about the pin, so the constraint has removed 2 degrees of freedom.

## contact constraint

A special constraint designed to prevent penetration of rigid bodies and to simulate friction and restitution. You do not create contact constraints; they are created automatically by Box2D.

## joint

This is a constraint used to hold two or more bodies together. Box2D supports several joint types: revolute, prismatic, distance, and more. Some joints may have limits and motors.

## joint limit

A joint limit restricts the range of motion of a joint. For example, the human elbow only allows a certain range of angles.

## joint motor

A joint motor drives the motion of the connected bodies according to the joint's degrees of freedom. For example, you can use a motor to drive the rotation of an elbow.

# Code Fest

I created this for the Devnology [Code Fest][1]. using XCode, ObjC and the Cocos2D Box2d framework.

[1]: http://devnology.nl/en/meetings/details/33-the-legacy-code-fest