cocos2d-x 鼠标或手指移动刚体

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QueryCallback.cpp

class QueryCallback : public b2QueryCallback{public:QueryCallback(const b2Vec2& point){m_point = point;m_fixture = NULL;} bool ReportFixture(b2Fixture* fixture){b2Body* body = fixture->GetBody();if (body->GetType() == b2_dynamicBody){bool inside = fixture->TestPoint(m_point);if (inside){m_fixture = fixture; // We are done, terminate the query.return false;}} // Continue the query.return true;} b2Vec2 m_point;b2Fixture* m_fixture;};

HelloWorld.h

virtual bool MouseDown(const b2Vec2& p);  virtual void MouseUp(const b2Vec2& p);  void MouseMove(const b2Vec2& p);  // b2Vec2 m_mouseWorld;    b2MouseJoint* m_mouseJoint;   b2Body *m_groundBody;//空的b2body,为了给鼠标关节设置刚体A

HelloWorld.cpp

bool HelloWorld::MouseDown(const b2Vec2& p)  {      if (m_mouseJoint != NULL)      {          return false;      }        // Make a small box.       b2AABB aabb;      b2Vec2 d;      d.Set(0.001f, 0.001f);      aabb.lowerBound = p - d;      aabb.upperBound = p + d;        // Query the world for overlapping shapes.       QueryCallback callback(p);        world->QueryAABB(&callback, aabb);        if (callback.m_fixture)      {          b2Body* body = callback.m_fixture->GetBody();          b2MouseJointDef md;          md.bodyA = m_groundBody;          md.bodyB = body;          md.target = p;          md.maxForce = 1000.0f * body->GetMass();          m_mouseJoint = (b2MouseJoint*)world->CreateJoint(&md);          body->SetAwake(true);          return true;      }  }   void HelloWorld::MouseMove(const b2Vec2& p)  {      //m_mouseWorld = p;         if (m_mouseJoint)      {          m_mouseJoint->SetTarget(p);      }  }   void HelloWorld::MouseUp(const b2Vec2& p)  {      if (m_mouseJoint)      {          world->DestroyJoint(m_mouseJoint);          m_mouseJoint = NULL;      }  }    bool HelloWorld::ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent)  {      isStart = pTouch->getLocation();      CCPoint nodePosition = convertToNodeSpace( isStart );      //PTM_RATIO = 32       return MouseDown(b2Vec2(nodePosition.x / PTM_RATIO, nodePosition.y / PTM_RATIO));  }  void HelloWorld::ccTouchMoved(CCTouch *pTouch, CCEvent *pEvent)  {      CCPoint start = pTouch->getLocation();//get the coordinate of the touch point in openGL       CCPoint nodePosition = convertToNodeSpace( start );      this->MouseMove(b2Vec2(nodePosition.x / PTM_RATIO, nodePosition.y / PTM_RATIO));  }    void HelloWorld::ccTouchEnded(CCTouch *pTouch, CCEvent *pEvent)  {      CCPoint nodePosition = convertToNodeSpace( pTouch->getLocation() );      this->MouseUp(b2Vec2(nodePosition.x / PTM_RATIO,nodePosition.y / PTM_RATIO));  }