Question

我有一张精灵表，其中有四个图像（bat1，bat2，bat3.bat4），在Image中有一个人拿着蝙蝠，当所有图像在动画中组合时，它看起来像打棒球。下面是我用来添加精灵表的代码。

[[CCSpriteFrameCache sharedSpriteFrameCache] addSpriteFramesWithFile:@"baseball.plist"];

spriteSheet = [CCSpriteBatchNode batchNodeWithFile:@"baseball.plist"];
[self addChild:spriteSheet];

background = [CCSprite spriteWithSpriteFrameName:@"bat4.png"];
background.position = ccp(220, 185);
background.tag = 10;
[self addChild:background];

for(int i = 1; i < 5; i++) {
        [walkAnimFrames addObject:[[CCSpriteFrameCache sharedSpriteFrameCache]    spriteFrameByName:[NSString stringWithFormat:@"bat%d.png", i]]];
}

CCAnimation * walkAnim = [CCAnimation animationWithSpriteFrames：walkAnimFrames delay：5.0f];

 self.walkAction = [CCRepeatForever actionWithAction:[CCAnimate actionWithAnimation:walkAnim]];

[background runAction:_walkAction];

我正在检测球与蝙蝠的碰撞。通过以下代码

for (CCSprite *monster in _monsters) {
        if (CGRectIntersectsRect(background.boundingBox, monster.boundingBox)) {
            if (((background.position.x -5 > monster.position.x + (monster.contentSize.width/2)) && background.position.y > monster.position.y)) {
                isCollision = 1;
                [monstersToDelete addObject:monster];
            }
           // [monstersToDelete addObject:monster];
            //[self addFishToBoat];
        }
    }

这里发生了碰撞是检测到碰撞，但它总是检测到与bat4的矩形碰撞..因为蝙蝠正在移动并且所有蝙蝠的cgrect都不同所以即使当bas离bat1非常远时它也会检测到碰撞，因为球的矩形将与bat4的矩形相交。

但是我希望只有当球会与不同的蝙蝠碰撞时才会发现碰撞，我的意思是当用蝙蝠，蝙蝠2，蝙蝠3，蝙蝠击打时，它只会检测到碰撞，而不是用蝙蝠4检测

Answer 1

这是Raywenderlich在sprites collision detection上的精彩教程。

或者

您也可以尝试本教程Sprite Collision

希望这些能帮到你。

Answer 2

您尝试使用此代码可能会对您有所帮助......

_contactListener = new MyContactListener();
_world->SetContactListener(_contactListener);

// Preload effect
[[SimpleAudioEngine sharedEngine] preloadEffect:@"hahaha.caf"];



std::vector<b2Body *>toDestroy; 
std::vector<MyContact>::iterator pos;
for(pos = _contactListener->_contacts.begin(); 
    pos != _contactListener->_contacts.end(); ++pos) {
    MyContact contact = *pos;

    b2Body *bodyA = contact.fixtureA->GetBody();
    b2Body *bodyB = contact.fixtureB->GetBody();
    if (bodyA->GetUserData() != NULL && bodyB->GetUserData() != NULL) {
        CCSprite *spriteA = (CCSprite *) bodyA->GetUserData();
        CCSprite *spriteB = (CCSprite *) bodyB->GetUserData();

        if (spriteA.tag == 1 && spriteB.tag == 2) {
            toDestroy.push_back(bodyA);
        } else if (spriteA.tag == 2 && spriteB.tag == 1) {
            toDestroy.push_back(bodyB);
        } 
    }        
}

std::vector<b2Body *>::iterator pos2;
for(pos2 = toDestroy.begin(); pos2 != toDestroy.end(); ++pos2) {
    b2Body *body = *pos2;     
    if (body->GetUserData() != NULL) {
        CCSprite *sprite = (CCSprite *) body->GetUserData();
        [_spriteSheet removeChild:sprite cleanup:YES];
    }
    _world->DestroyBody(body);
}

if (toDestroy.size() > 0) {
    [[SimpleAudioEngine sharedEngine] playEffect:@"hahaha.caf"];   
}

有关此代码访问的详细信息

http://www.raywenderlich.com/606/how-to-use-box2d-for-just-collision-detection-with-cocos2d-iphone

检测精灵表中与精灵的碰撞

2 个答案: