In our first physics recipe, we will explore the basics of creating a Box2D project and setting up a Box2D world. The example creates a scene that allows the user to create realistic 2D blocks.
The first thing we need to do is create a Box2D project using the built-in Box2D project template:
Go to File | New Project.
Under User Templates click on Cocos2d.
Now, right click on Cocos2d Box2d Application.
Click Choose, name your project, and hit Save.
Now, execute the following code:
#import "Box2D.h"
#import "GLES-Render.h"
//32 pixels = 1 meter
#define PTM_RATIO 32
@implementation Ch4_BasicSetup
-(CCLayer*) runRecipe {
[super runRecipe];
/* Box2D Initialization */
//Set gravity
b2Vec2 gravity;
gravity.Set(0.0f, -10.0f);
//Initialize world
bool doSleep = YES;
world = new b2World(gravity, doSleep);
world->SetContinuousPhysics(YES);
...