Question

我设置了我的游戏世界（cocos2d-b2world）这样的边缘：

-(void)worldEdge
{
    CGSize winSize = [CCDirector sharedDirector].winSize;
    b2BodyDef groundBodyDef;
    groundBodyDef.position.Set(0,0);
    b2Body *groundBody = world->CreateBody(&groundBodyDef);
    b2PolygonShape groundBox;
    b2FixtureDef boxShapeDef;
    boxShapeDef.shape = &groundBox;
    groundBox.SetAsEdge(b2Vec2(0,0), b2Vec2(winSize.width/PTM_RATIO, 0));
    groundBody->CreateFixture(&boxShapeDef);
    groundBox.SetAsEdge(b2Vec2(0,0), b2Vec2(0, winSize.height/PTM_RATIO));
    groundBody->CreateFixture(&boxShapeDef);
    groundBox.SetAsEdge(b2Vec2(0, winSize.height+100/PTM_RATIO), b2Vec2(winSize.width+100/PTM_RATIO, winSize.height+100/PTM_RATIO));
    groundBody->CreateFixture(&boxShapeDef);
    groundBox.SetAsEdge(b2Vec2(winSize.width+100/PTM_RATIO, winSize.height+100/PTM_RATIO), b2Vec2(winSize.width/PTM_RATIO, 0));
    groundBody->CreateFixture(&boxShapeDef);
}

我的iphone处于纵向模式，有些如何，我没有在顶部的边缘，但在地面上我做，而在左侧我有但在右侧我不。

似乎我不了解世界边缘的某些东西，有人可以帮助我改变它以使底部“边缘自由”，但右边会有优势吗？

非常感谢。

Answer 1

在cocos2d ccp（0,0）中放置在左下角。

 -(void)worldEdge
{
CGSize winSize = [CCDirector sharedDirector].winSize;
b2BodyDef groundBodyDef;
groundBodyDef.position.Set(0,0);
b2Body *groundBody = world->CreateBody(&groundBodyDef);
b2PolygonShape groundBox;
b2FixtureDef boxShapeDef;
boxShapeDef.shape = &groundBox;
groundBox.SetAsEdge(b2Vec2(0,winSize.height/PTM_RATIO), b2Vec2(winSize.width/PTM_RATIO, winSize.height/PTM_RATIO));//for Top edge
groundBody->CreateFixture(&boxShapeDef);
groundBox.SetAsEdge(b2Vec2(0,0), b2Vec2(0, winSize.height/PTM_RATIO));//for Left edge
groundBody->CreateFixture(&boxShapeDef);
groundBox.SetAsEdge(b2Vec2(winSize.width/PTM_RATIO, 0), b2Vec2(winSize.width/PTM_RATIO, winSize.height/PTM_RATIO));//for Right
groundBody->CreateFixture(&boxShapeDef);

groundBody->CreateFixture(&boxShapeDef);
}

Answer 2

我已经知道了。正如我所描述的答案，我就是这样做的：

// bottom edge
groundBox.SetAsEdge(b2Vec2(0,0), b2Vec2(width,0));
groundBody->CreateFixture(&groundBox);

// top edge
groundBox.SetAsEdge(b2Vec2(0,height), b2Vec2(width,height));
groundBody->CreateFixture(&groundBox);

// left edge
groundBox.SetAsEdge(b2Vec2(0,height), b2Vec2(0,0));
groundBody->CreateFixture(&groundBox);

// right edge
groundBox.SetAsEdge(b2Vec2(width,height), b2Vec2(width,0));
groundBody->CreateFixture(&groundBox);

当在每个边缘时，我们有:(从点到点）每个点都是一个向量。

iphone的cocos2d世界优势

2 个答案: