How to implement horizontal and vertical scroll in box2d world properly?

I have implemented horizontal scroll, but vertical scroll making trouble, and the trouble is difficult to explain. So I can scroll scene vertically, and horizontally, if that is been done from the scene's origin, i.e ccp(0,0). But when Scrolling towards X have been done, and been paused in the middle, then if i scroll it vertically, it actually scroll diagonally, back to origin(x), and new position of y.

开发者_开发技巧 I know it's complicated to understand, but how can it be achieved to scroll it vertically from the position it have been scrolled down.

IF SOMEONE HAVE GOT MY QUESTION THEN HERE IS THE ANSWR FOR HIM,

//NAVIGATION TOWARDS X AND Y WhenEver and how ever you want         
            if (abs(diffX) > abs(diffY))
            {
                CCLOG(@"yScrlFlag=%d",yScrlFlag);
                if(diffX > 0)
                {
                    xScrlFlag=1;
                    [self.parent runAction:[CCMoveTo actionWithDuration:round(-(-3112-self.parent.position.x)/250) position:ccp((-3112-self.position.x),self.parent.position.y)]];
                }
                else
                {
                    [self.parent runAction:[CCMoveTo actionWithDuration:(-self.parent.position.x/250) position:ccp(0,self.parent.position.y)]];
                    xScrlFlag=0;
                }
            }
            else
            {   
                if (1) 
                {
                    if(diffY < 0)
                    {
                        yScrlFlag=1;
                        //CCLOG(@"\n nodePosition.x=%f \n nodePosition.y=%f",nodePosition.x,nodePosition.y);
                        [self.parent runAction:[CCMoveTo actionWithDuration:(-(-500-self.parent.position.y)/250) position:ccp(self.parent.position.x,(-self.position.y))]];
                    }
                    else
                    {   
                        yScrlFlag=0;
                        [self.parent runAction:[CCMoveTo actionWithDuration:(-(-500-self.parent.position.y)/250) position:ccp(self.parent.position.x,0)]];
                    }   
                    CCLOG(@"yScrlFlag=%d",yScrlFlag);                       
                }
            }