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undolast
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1991-11-22
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7.1.8 UNDO LAST
The UNDO LAST command provides a limited undo function that is capable of
reversing the action of commands that modify or delete entities. Commands
such as DRAW LINE or DRAW ARC etc. are not affected by UNDO LAST as they
create, as opposed to modify entities. As the name of the command implies,
UNDO LAST can only undo the last valid command.
When IDENTS is used to select entities in a command that will modify
entities, the previous state of any selected entities is stored in an undo
buffer. The UNDO LAST command will then restore modified entities to their
previous state if required. Commands such as VERIFY ENTITY will not affect
the undo buffer as this type of command only selects entities for reference
and not for modification.
The list of commands that may be reversed via UNDO LAST is as follows:
CHANGE ARC CHANGE DEPTH CHANGE DIMENSION
CHANGE ELLIPSE CHANGE FONT CHANGE LAYER
CHANGE POLYGON CHANGE STRING CHANGE SYMBOL
CHANGE TEXT CHANGE TNODE CHANGE XHATCH
DELETE ENTITY DRAW FILLET EXCLUDE ENTITY
MIRROR ENTITY MOVE ENTITY ROTATE ENTITY
SCALE ENTITY STRETCH ENTITY STRETCH WINDOW
TRIM ENTITY
The following commands reset the undo buffer:
DEFINE SHEET DELETE VIEWPORT
CLOSE DRAWING SAVE DRAWING
SELECT ENVIRONMENT [UNDO] UNDO LAST
The number of entities that can be undone from modification be the last
command is limited by the size of the undo buffer. This is set as default to
64K and can be increased or decreased in size using the SELECT ENVIRONMENT
command.
COMMAND FORMAT
#UNDO LAST [CR]
A requester will appear for confirmation that the undo is required. Once
this is answered OK the action of UNDO LAST cannot be reversed.