the attribute toolbar object label in Chapter 2.
Select a datum mark of an object, 3D，Z。
Select a datum mark of an object, and the property of 3D metafile
does not work. It is rotated around the Z-axis by default.
Relative Center: Change the current coordinates into relative coordinates.
: Let the modification of the current object active.
Apply: Let the modification of the current object active.
: Move selection to a new location
: This item is used to copy the currently selected object
and rotate it into a new place.
Apply to Copy Object: This item is used to copy the
currently selected object and rotate it into a new place.
5.2.3. Mirror
: Mirror the currently selected object.
: Represents a mirror transform. The mirror Transform command can
mirror the currently selected object.
When selecting mirror command, a parameter setting box will appear as
shown in Fig. 5-7.
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