Cocos2d Box2d多個b2circle形狀夾具一體定位

Question

任何人都知道如何將2個圓形夾具添加到一個具有所需定位的b2body？ 我知道如何使用m_centroid將兩個多邊形夾具添加到一個物體。但我怎樣才能做到圈裝置。

任何答案將不勝感激。我想把一些物體粘在一起。我試過關節，但都是彈性的。我想要距離靜態。

謝謝大家！

Answer 1

你應該創建兩場比賽對你的身體和這些燈具的形狀應該是b2CircleShape

//Create a body. You'll need a b2BodyDef, but I've assumed you know how to use these since you say you've created bodies successfully before. 
b2Body* body = world->CreateBody(&bodyDef); 

//Create the first circle shape. It's offset from the center of the body by -2, 0. 
b2CircleShape circleShape1; 
circleShape1.m_radius = 0.5f; 
circleShape1.m_p.Set(-2.0f, 0.0f); 

b2FixtureDef circle1FixtureDef; 
circle1FixtureDef.shape = &circleShape1; 
circle1FixtureDef.density = 1.0f; 


//Create the second circle shape. It's offset from the center of the body by 2, 0. 
b2CircleShape circleShape2; 
circleShape2.m_radius = 0.5f; 
circleShape2.m_p.Set(2.0f, 0.0f); 

b2FixtureDef circle2FixtureDef; 
circle2FixtureDef.shape = &circleShape2; 
circle2FixtureDef.density = 1.0f; 


//Attach both of these fixtures to the body. 
body->CreateFixture(&circle1FixtureDef); 
body->CreateFixture(&circle2FixtureDef);