cocos2d-x 鼠标或手指移动刚体

/************************************************************************//*              QueryCallback                                           *//************************************************************************/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;};

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;}}

/*一下是为了测试移动整个世界*/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

bool HelloWorld::ccTouchBegan(CCTouch *pTouch, CCEvent *pEvent){isStart = pTouch->getLocation();CCPoint nodePosition = convertToNodeSpace( isStart );//PTM_RATIO = 32return 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 openGLCCPoint 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));}