3. The computer-implemented method of claim 2 , wherein the widget is displayed with one division in an active state, and the rendered arrangement corresponds to the one division that is active.
2. The computer-implemented method of claim 1 , wherein the user-interface widget comprises a number of divisions, each division designating a respective one of the locations determined for placement of the new dimension annotation, and for the cursor hovering over a given division of the widget, displaying a preview of the rendered arrangement having the new dimension annotation placed in the respective determined location designated by the given division.