The operation content of the undo function of the geometric sketchpad

Generally speaking, the method that users are familiar with is [Delete]. But you must be very careful when deleting in Geometry Sketchpad. Because if you delete an object, the child objects of this object will be deleted at the same time.

The [Undo] function in the edit menu is very powerful. It is recommended to use the [Undo] function. You can use the [Undo] function in the [Edit] menu to cancel the content you just drew and restore it to the previous working state. You can also restore it step by step to the initial state (blank artboard, or the state of opening the artboard this time). The shortcut key for this function is [Ctrl Z]. If you no longer want to [Undo] at this time, you can use the [Restore] function to restore the undo. The shortcut key is [Ctrl R].

Before pressing the drop-down menu, press the Shift key, and the [Undo] command will become [Undo All]. The shortcut key is [Ctrl Shift Z]. This is a quick way to get a blank drawing board file, commonly known as [erasing the blackboard]. In the same way, the shortcut key [Ctrl Shift R] is to restore all undos.

If there is an object that you want to delete without affecting other objects, you should use the hidden method. The method of hiding is: first select the object to be hidden, and then click the menu option: [Show] - [Hide Object (H)] or press the shortcut key [Ctrl H]. This is a very frequently used shortcut key.

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