Question

这就是我将自己的身体从世界中移除的方式：_world->DestroyBody(spriteBody);

在我的游戏中，我不断创建Cocos2d Sprite和Box2D Body，我也不断删除它们。

然而，当我尝试LOG("%d", _world->GetBodyCount());时，这个数字会增加而且永远不会减少。

我认为_world->DestroyBody(spriteBody);可能无法完全删除我的Box2D正文。

这是我的删除方法。

void GameScene::deleteSprite(Sprite *sprite){

b2Body *spriteBody = NULL;
for(b2Body *b = _world->GetBodyList(); b; b=b->GetNext()) {
    if (b->GetUserData() != NULL) {
        Sprite *curSprite = (Sprite *)b->GetUserData();
        if (sprite == curSprite) {
            log("3");
            spriteBody = b;
            break;
        }
    }
}
if (spriteBody != NULL) {
    //spriteBody->SetUserData(NULL);
    //b2Fixture* f = spriteBody->GetFixtureList();
    //spriteBody->DestroyFixture(f);
    spriteBody->GetWorld()->DestroyBody(spriteBody);
}
sprite->removeFromParentAndCleanup(true);
}

创建方法 - 我从GMTDev和Raywenderlich获取此代码。 Box2D仅用于碰撞检测

 void GameScene::addBoxBodyForSprite( Sprite *sprite, int iNumVerts, b2Vec2 verts[] ){

    if( _world==NULL )
        return;

    Point pos = sprite->getPosition();
    Size size = sprite->getContentSize();

    b2BodyDef spriteBodyDef;
    spriteBodyDef.type = b2_dynamicBody;
    spriteBodyDef.position.Set(pos.x/PTM_RATIO, pos.y/PTM_RATIO);
    spriteBodyDef.userData = sprite;
    b2Body *spriteBody = _world->CreateBody(&spriteBodyDef);

    b2PolygonShape spriteShape;

    if( iNumVerts!=0 )
    {
        spriteShape.Set(verts, iNumVerts);
        b2FixtureDef spriteShapeDef;
        spriteShapeDef.shape = &spriteShape;
        spriteShapeDef.density = 10.0;
        spriteShapeDef.isSensor = true;

        spriteBody->CreateFixture(&spriteShapeDef);
    }
    else
    {
        // No Vertice supplied so just make a box round the sprite
        b2BodyDef spriteBodyDef;
        spriteBodyDef.type = b2_dynamicBody;
        spriteBodyDef.position.Set( pos.x/PTM_RATIO, pos.y/PTM_RATIO );
        spriteBodyDef.userData = sprite;
        b2Body *spriteBody = _world->CreateBody( &spriteBodyDef );

        b2PolygonShape spriteShape;
        spriteShape.SetAsBox( size.width/PTM_RATIO/2, size.height/PTM_RATIO/2 );
        b2FixtureDef spriteShapeDef;
        spriteShapeDef.shape = &spriteShape;
        spriteShapeDef.density = 10.0;
        spriteShapeDef.isSensor = true;                     // isSensor true when you want to know when objects will collide without triggering a box2d collision response
        spriteBody->CreateFixture( &spriteShapeDef );
    }

}

谢谢！

Answer 1

问题是在@UmeshSharma和@ LearnCocos2D

的帮助下解决的我从GMTDev获取的create方法中的

有一些错误，其中函数_world-＆gt; CreateBody被使用了两次（当iNumVerts == 0时）

因此，当我删除我的身体和精灵。实际上还有另一个身体用于该精灵。然后它崩溃了Box2D机身找不到它的Cocos2d精灵的更新。

基于Cocos2d精灵更新Box2D机身位置的崩溃

1 个答案: