The last major feature of Box2D we have yet to investigate is joints. Joints allow us to link objects to create simple machines like pulleys, levers, and simple motors. In this recipe, we will learn how to create a simple seesaw using a joint.
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.
Execute the following code:
@implementation Ch4_Joints -(CCLayer*) runRecipe { [super runRecipe]; [message setString:@"Drop the weight on the see-saw"]; //Initialization movableObjects = [[[NSMutableArray alloc] init] autorelease]; objectGrabbed = NO; //Create level boundaries [self addLevelBoundaries]; //Add objects [self addSeeSaw]; [self addBoxWithPosition:ccp(130,120) file:@"crate2.png" density:1.0f]; [self addBoxWithPosition:ccp(160,120) file:@"crate2.png" density:1.0f]; [self addBoxWithPosition:ccp(145,150) file:@"crate2.png...