Stage.updateBoundRect C# (CSharp) Method

    public override void updateBoundRect()
    {
        _isBoundRectDirty	= false;
        Vector2 minPos	= new Vector2(999999,999999);
        Vector2 maxPos	= new Vector2(-999999,-999999);

        // loop though children to get the bound area of children

        foreach(DisplayObject child in _childList){

            Rect childBoundRect	= _transform.getBoundRect(child.boundRect);
            if(childBoundRect.x < minPos.x){
                minPos.x	= childBoundRect.x;
            }
            if(childBoundRect.x+childBoundRect.width > maxPos.x){
                maxPos.x	= childBoundRect.x+childBoundRect.width;
            }
            if(childBoundRect.y < minPos.y){
                minPos.y	= childBoundRect.y;
            }
            if(childBoundRect.y+childBoundRect.height > maxPos.y){
                maxPos.y	= childBoundRect.y+childBoundRect.height;
            }
        }

        if(maxPos.x>minPos.x && maxPos.y>minPos.y){
            _originalWidth			= maxPos.x-minPos.x;

            _originalHeight			= maxPos.y-minPos.y;

            // get boundRect, boundRect is related with it's parent
            _boundRect.x			= minPos.x;
            _boundRect.y			= minPos.y;
            _boundRect.width		= maxPos.x-minPos.x;
            _boundRect.height		= maxPos.y-minPos.y;
            _width					= _boundRect.width;
            _height					= _boundRect.height;
        }else{
            _boundRect.x			= 0;
            _boundRect.y			= 0;
            _boundRect.width		= 0;
            _boundRect.height		= 0;
            _width					= 0;
            _height					= 0;
        }

        _boundRectInTree		= _boundRect;
        //Debug.Log(id+ "updateBoundRect" + _boundRect);
    }