Cocos Anchor Point, bounding box

Cocos, SetPosition is setting the anchor point of a sprite in the coordinates of the parent element the default anchor point is that the midpoint of the sprite rectangle can be returned with a getboundingbox to the rectangular extent of a sprite. The range is represented by a rect, which is based on the parent element's coordinate system. The four members of a RECT are x,y,width,height, which represent the position of the lower-left vertex, and the length-width

From for notes (Wiz)

Cocos Anchor Point, bounding box