box2d碰撞检测，代码

即时通讯新编程，我已经尝试了射线wenderlich教程，但即时通讯仍然困惑。box2d碰撞检测，代码

我有一个叫做rock的精灵，和一个叫做player的精灵，我试图检测它们之间的碰撞。但我很困惑。需要一些帮助。

-(void)addRock { 

CCSprite *rock = [CCSprite spriteWithFile:@"rock.png" 
            rect:CGRectMake(0, 0, 27, 40)]; 

// Determine where to spawn the target along the X axis 
CGSize winSize = [[CCDirector sharedDirector] winSize]; 
int minX = rock.contentSize.width/2; 
int maxX = winSize.width - rock.contentSize.width/2; 
int rangeX = maxX - minX; 
int actualX = (arc4random() % rangeX) + minX; 

// Create the target slightly off-screen along the right edge, 
// and along a random position along the X axis as calculated above 
rock.position = ccp(actualX, 500); 
[self addChild:rock]; 

// Determine speed of the sprite 
int actualDuration = 5;//speed of sprite

}

- (id)init { 

if ((self=[super init])) { 

     CGSize winSize = [[CCDirector sharedDirector] winSize]; 

     CCSprite *player = [CCSprite spriteWithFile:@"Player.png" 
            rect:CGRectMake(0, 0, 27, 40)]; 

     player.position = ccp(winSize.width/2, winSize.height/4+15); 

     [self addChild:player]; 

     [self schedule:@selector(gameLogicRock:) interval:0.2];

他们是两个精灵，它们产卵，正确的位置，我只需要检测碰撞

来源

2012-02-13 sahil

请更正您的代码。它杂乱无章，难以理解。 – 2012-02-13 15:12:51

好的，只是整齐的...对不起 – sahil 2012-02-13 15:56:40

您必须实现一个新的类的碰撞，或者说接触听众基于一些标准作为标签号。我有一个例子给你。

// ContactListener.h

#import "Box2D.h" 

class ContactListener : public b2ContactListener 
{ 
private: 
    void BeginContact(b2Contact* contact); 
    void EndContact(b2Contact* contact); 
};

// ContactListener.mm

#import "ContactListener.h" 
#import "cocos2d.h" 
#import "BodyNode.h" 
#import "GameScene.h" 

void ContactListener::BeginContact(b2Contact* contact) 
{ 
    b2Body* bodyA = contact->GetFixtureA()->GetBody(); 
    b2Body* bodyB = contact->GetFixtureB()->GetBody(); 
    if (bodyA->GetUserData() != NULL && bodyB->GetUserData() != NULL) 
    { 
     BodyNode* bNodeA = (BodyNode*)bodyA->GetUserData(); 
     BodyNode* bNodeB = (BodyNode*)bodyB->GetUserData(); 

     if ((bNodeA.tag == GameSceneNodeTagBall && bNodeB.tag == GameSceneNodeTagHole) || 
      (bNodeA.tag == GameSceneNodeTagHole && bNodeB.tag == GameSceneNodeTagBall)) 
     { 
      switch (bNodeA.tag) { 
       case GameSceneNodeTagBall: 
        if ([bNodeA isKindOfClass:[Ball class]]) { 
         Ball* ball = (Ball*)bNodeA; 
         ball.sprite.visible = NO; 
         [[GameScene sharedGameScene] gameOver]; 
        } 
        break; 
       case GameSceneNodeTagHole: 
        if ([bNodeB isKindOfClass:[Ball class]]) { 
         Ball* ball = (Ball*)bNodeB; 
         ball.sprite.visible = NO; 
         [[GameScene sharedGameScene] gameOver]; 
        } 
        break; 

       default: 
        break; 
      } 
     } 
    } 
}

这是球和空穴碰撞的示例。你可以根据你的要求使用它。

希望这会帮助你。

谢谢！

来源

2012-02-14 04:50:14 Haroon

box2d碰撞检测，代码

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