If the selected object is larger than the screen, the handles may not be visible. If they are hidden offscreen, not only are they unavailable for direct manipulation, but they are also useless as indicators of selection.

• 如果所选对象比显示屏还大，控制柄可能看不见；如果它们隐藏在显示屏后面，那么它们不仅不能用于直接操作，而且作为选择指示器也没有用。