Question

我正在使用cocos2d v1.0.1＆amp;相应的Box2d版本。在模拟器中一切正常。它只是一个在触摸位置下降到地面的身体。但我在设备iphone4上运行它，对象向上浮动。

为什么会发生这种情况？

重力设定为-0.3f。我在场景中有另一个动态的身体，它应该出现在地面的底部。它只是漂浮起来的触摸物体。睡眠是真的。

我只是把睡眠设置为假，现在流浪者也浮起来了。但它不应该飘起来。这是我的世界创作方法：

- (void)setupWorld {
    b2Vec2 gravity = b2Vec2(0.0f, -0.3f);
    bool doSleep = false;
    world = new b2World(gravity, doSleep);
}

这是我从init创建的身体：

Box2DSprite *roverSprite = [Box2DSprite spriteWithSpriteFrameName:@"rover.png"];
        [self createBoxAtLocation:ccp(100,15) withSize:CGSizeMake(50, 50) forSprite:roverSprite isBox:TRUE];
        [sceneSpriteBatchNode addChild:roverSprite];

这是createBox方法：

- (void)createBoxAtLocation:(CGPoint)location withSize:(CGSize)size forSprite:(Box2DSprite *)sprite isBox:(BOOL)isBox{
    b2BodyDef bodyDef;
    bodyDef.type = b2_dynamicBody;
    bodyDef.position = b2Vec2(location.x/PTM_RATIO, location.y/PTM_RATIO);
    b2Body *body = world->CreateBody(&bodyDef);
    //
    body->SetUserData(sprite);
    sprite.body = body;


    b2FixtureDef fixtureDef;

    //
    if (isBox) {
        b2PolygonShape shape;
        shape.SetAsBox(sprite.contentSize.width/3/PTM_RATIO,
                       sprite.contentSize.height/3/PTM_RATIO);
        fixtureDef.shape = &shape;
    } else {
        b2CircleShape shape;
        shape.m_radius = sprite.contentSize.width/2/PTM_RATIO;
        fixtureDef.shape = &shape;
    }

    fixtureDef.density = 1.0;
    fixtureDef.friction = 1.0;
    fixtureDef.restitution = 0.5;
    body->CreateFixture(&fixtureDef);
}

同样的方法也用于从这些行创建的触摸创建对象：

-(BOOL) ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event {
    CGPoint touchLocation = [touch locationInView:[touch view]];
    touchLocation = [[CCDirector sharedDirector] convertToGL:touchLocation];
    touchLocation = [self convertToNodeSpace:touchLocation];
    //b2Vec2 locationWorld = b2Vec2(touchLocation.x/PTM_RATIO, touchLocation.y/PTM_RATIO);

    Box2DSprite *sprite = [Box2DSprite spriteWithSpriteFrameName:@"koko1.png"];
    [self createBoxAtLocation:touchLocation withSize:CGSizeMake(50, 50) forSprite:sprite isBox:TRUE];
    [sceneSpriteBatchNode addChild:sprite];
    return TRUE;
}

Answer 1

您是在纵向还是横向模式？如果在风景中，也许您将设备向左旋转而不是向右旋转。设备方向可以交换加速度计的y值。不确定这是否与您的问题有关。

Answer 2

原来我将目标设置旋转到右边而不是左边。

box2d的身体下降而不是下降

2 个答案: