cocos2d-x 鼠标或手指移动刚体

[cpp]  /************************************************************************/  
/*              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;  
};  
 
/************************************************************************/
/*              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;
};
[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;  
    }  
}  
 
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;
}
}
[cpp]  void HelloWorld::MouseMove(const b2Vec2& p)  
{  
    //m_mouseWorld = p;   
  
    if (m_mouseJoint)  
    {  
        m_mouseJoint->SetTarget(p);  
    }  
}  
 
void HelloWorld::MouseMove(const b2Vec2& p)
{
//m_mouseWorld = p;
 
if (m_mouseJoint)
{
m_mouseJoint->SetTarget(p);
}
}
[cpp]  void HelloWorld::MouseUp(const b2Vec2& p)  
{  
    if (m_mouseJoint)  
    {  
        world->DestroyJoint(m_mouseJoint);  
        m_mouseJoint = NULL;  
    }  
}  
 
void HelloWorld::MouseUp(const b2Vec2& p)
{
if (m_mouseJoint)
{
world->DestroyJoint(m_mouseJoint);
m_mouseJoint = NULL;
}
}
[cpp]  /*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  
 
/*一下是为了测试移动整个世界*/<

补充：移动开发 , 其他 ,

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